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<front>
<journal-meta>
<journal-id>0065-1737</journal-id>
<journal-title><![CDATA[Acta zoológica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Zool. Mex]]></abbrev-journal-title>
<issn>0065-1737</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0065-17372014000300015</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Resolución de conflictos sociales en primates: 35 años de investigación]]></article-title>
<article-title xml:lang="en"><![CDATA[The resolution of social conflicts in primates: 35 years of research]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de la O]]></surname>
<given-names><![CDATA[Claudio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mondrágón-Ceballos]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Psicología ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz  ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2014</year>
</pub-date>
<volume>30</volume>
<numero>3</numero>
<fpage>662</fpage>
<lpage>687</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0065-17372014000300015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0065-17372014000300015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0065-17372014000300015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El conflicto social, especialmente aquél que involucra interacciones agresivas entre los actores, ha sido un tema de interés para las disciplinas dedicadas al estudio de la conducta. Los biólogos de la conducta postulan que las afiliaciones postconflicto entre los oponentes previos, también conocidas como "reconciliación", constituyen una estrategia para amortiguar los costos resultantes de la agresión. El año de 1979 marca el inicio de los estudios metodológicamente rigurosos en este tópico. Desde entonces, el tema ha sido investigado principalmente por primatólogos, lo cual se refleja en la escasa información sobre el fenómeno en otros órdenes. A la fecha, las afiliaciones postconflicto han sido reportadas en casi 40 especies, la mayoría de ellas primates. Aun cuando existe un consenso en la función socialmente homeostática de las afiliaciones postconflicto, numerosas preguntas permanecen sin respuesta. Estas incluyen la importancia de tales interacciones para las especies no-primates, la importancia relativa de las diversas fuentes de ocurrencia y variación del fenómeno, así como las funciones y procesos involucrados en su evolución. En este escrito ofrecemos una revisión sobre el estado del arte y señalamos algunos temas que ameritan mayor investigación, en aras de obtener un mejor entendimiento de las dinámicas de resolución del conflicto social e incluso, de los principios organizativos que subyacen a las sociedades animales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Social conflict, especially that involving aggressive interactions, for years has attracted the interest of the disciplines devoted to the study of behavior. Behavioral biologists claim that peaceful postconflict contacts involving former opponents, also known as "reconciliation", are a strategy for buffering the costs resulting from aggressive interactions. The start of carefully controlled research on this topic can be set in 1979. Thenceforth, this issue has been addressed mostly by primatologist, leaving a gap in the information for other orders. To date, peaceful posconflict affiliations have been reported to occur in almost 40 species, most of them primates. Even though all studies agree about the homeostatic social function of peaceful postconflict contacts, several questions remain unanswered. These include investigating the importance of these interactions for non-primate species, the relative importance of diverse sources of occurrence and variation as well as functions and processes involved in their evolution. In this paper we summarize the current knowledge on the topic, and state some issues that should be addressed in future research in order to get a better understanding of conflict resolution dynamics, and even the organization principles underlying animal societies.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Conflicto]]></kwd>
<kwd lng="es"><![CDATA[Agresión]]></kwd>
<kwd lng="es"><![CDATA[Afiliación]]></kwd>
<kwd lng="es"><![CDATA[Relaciones sociales]]></kwd>
<kwd lng="es"><![CDATA[Reconciliación]]></kwd>
<kwd lng="en"><![CDATA[Conflict]]></kwd>
<kwd lng="en"><![CDATA[Aggression]]></kwd>
<kwd lng="en"><![CDATA[Affiliation]]></kwd>
<kwd lng="en"><![CDATA[Social relationships]]></kwd>
<kwd lng="en"><![CDATA[Reconciliation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Ensayo</font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Resoluci&oacute;n de conflictos sociales en primates: 35 a&ntilde;os de investigaci&oacute;n</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>The resolution of social conflicts in primates: 35 years of research</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Claudio de la O<sup>1,*</sup> y Ricardo Mondr&aacute;g&oacute;n&#45;Ceballos<sup>2</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup><i>Facultad de Psicolog&iacute;a, Universidad Nacional Aut&oacute;noma de M&eacute;xico y Departamento de Etolog&iacute;a, Instituto Nacional de Psiquiatr&iacute;a Ram&oacute;n de la Fuente Mu&ntilde;iz.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">*Autor corresponsal: <i>Calzada M&eacute;xico Xochimilco, No. 101, Col. San Lorenzo Huipulco, Del. Tlalpan, M&eacute;xico, Distrito Federal. C.P. 14370;</i> &lt;<a href="mailto:clavdivsimperator@gmail.com">clavdivsimperator@gmail.com</a>&gt;</font></p>      <p align="justify"><font face="verdana" size="2"><sup><i>2</i></sup><i>Departamento de Etolog&iacute;a, Instituto Nacional de Psiquiatr&iacute;a Ram&oacute;n de la Fuente Mu&ntilde;iz.</i> &lt;<a href="mailto:rmc@imp.edu.mx">rmc@imp.edu.mx</a>&gt;</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido: 06/12/2013;    <br> 	aceptado: 10/04/2014.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El conflicto social, especialmente aqu&eacute;l que involucra interacciones agresivas entre los actores, ha sido un tema de inter&eacute;s para las disciplinas dedicadas al estudio de la conducta. Los bi&oacute;logos de la conducta postulan que las afiliaciones postconflicto entre los oponentes previos, tambi&eacute;n conocidas como "reconciliaci&oacute;n", constituyen una estrategia para amortiguar los costos resultantes de la agresi&oacute;n. El a&ntilde;o de 1979 marca el inicio de los estudios metodol&oacute;gicamente rigurosos en este t&oacute;pico. Desde entonces, el tema ha sido investigado principalmente por primat&oacute;logos, lo cual se refleja en la escasa informaci&oacute;n sobre el fen&oacute;meno en otros &oacute;rdenes. A la fecha, las afiliaciones postconflicto han sido reportadas en casi 40 especies, la mayor&iacute;a de ellas primates. Aun cuando existe un consenso en la funci&oacute;n socialmente homeost&aacute;tica de las afiliaciones postconflicto, numerosas preguntas permanecen sin respuesta. Estas incluyen la importancia de tales interacciones para las especies no&#45;primates, la importancia relativa de las diversas fuentes de ocurrencia y variaci&oacute;n del fen&oacute;meno, as&iacute; como las funciones y procesos involucrados en su evoluci&oacute;n. En este escrito ofrecemos una revisi&oacute;n sobre el estado del arte y se&ntilde;alamos algunos temas que ameritan mayor investigaci&oacute;n, en aras de obtener un mejor entendimiento de las din&aacute;micas de resoluci&oacute;n del conflicto social e incluso, de los principios organizativos que subyacen a las sociedades animales.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Conflicto, Agresi&oacute;n, Afiliaci&oacute;n, Relaciones sociales, Reconciliaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Social conflict, especially that involving aggressive interactions, for years has attracted the interest of the disciplines devoted to the study of behavior. Behavioral biologists claim that peaceful postconflict contacts involving former opponents, also known as "reconciliation", are a strategy for buffering the costs resulting from aggressive interactions. The start of carefully controlled research on this topic can be set in 1979. Thenceforth, this issue has been addressed mostly by primatologist, leaving a gap in the information for other orders. To date, peaceful posconflict affiliations have been reported to occur in almost 40 species, most of them primates. Even though all studies agree about the homeostatic social function of peaceful postconflict contacts, several questions remain unanswered. These include investigating the importance of these interactions for non&#45;primate species, the relative importance of diverse sources of occurrence and variation as well as functions and processes involved in their evolution. In this paper we summarize the current knowledge on the topic, and state some issues that should be addressed in future research in order to get a better understanding of conflict resolution dynamics, and even the organization principles underlying animal societies.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Conflict, Aggression, Affiliation, Social relationships, Reconciliation.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Las sociedades animales: cooperaci&oacute;n y conflicto</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Uno de los temas m&aacute;s controvertidos en las ciencias del comportamiento ha sido el estudio de la agresi&oacute;n, la cual hist&oacute;ricamente ha sido considerada como un fen&oacute;meno antisocial o caracter&iacute;stico de alguna patolog&iacute;a (ver Ardrey 1969; Morris 1969; Bandura 1973; Fromm 1986; Anderson &amp; Bushman 2002). En el caso particular de la etolog&iacute;a, esta concepci&oacute;n se fundamentaba en estudios sobre el comportamiento agresivo en peces y aves altamente territoriales, en los cuales el ejercicio de la agresi&oacute;n conduce al distanciamiento de los individuos (de Waal 2000). A partir de los a&ntilde;os setenta del siglo XX los estudiosos de la conducta animal, en particular quienes estudiaban animales gregarios, notaron que la agresi&oacute;n era ante todo un fen&oacute;meno social. Este se inscribe en el contexto de la competencia y el conflicto por el acceso a recursos de diversa &iacute;ndole (Colmenares 1996). No obstante, la existencia de un conflicto social no conduce inevitablemente a la agresi&oacute;n, la cual es s&oacute;lo una de entre varias formas de resolver el conflicto (Kappeler &amp; van Schaik 1992; de Waal 1996; Silk 2002). Desde un punto de vista adaptativo, es de esperar que el balance entre los beneficios obtenidos por el uso de la agresi&oacute;n (en t&eacute;rminos de un incremento del &eacute;xito reproductivo) y los costos resultantes, influyan en su ocurrencia e intensidad (Parker 1974; Maynard&#45;Smith &amp; Parker 1976; Parker &amp; Rubenstein 1981; Archer &amp; Huntingford 1994).</font></p>  	    <p align="justify"><font face="verdana" size="2">La mayor parte de nuestro escrito se basa en hallazgos reportados en las especies pertenecientes al orden Primate, lo cual es un reflejo del estado del arte. No obstante, la discusi&oacute;n puede ser generalizada a otras especies que presenten sistemas sociales semejantes.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>El modelo relacional de la agresi&oacute;n</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Un cambio sustancial en la manera de entender el papel de la agresi&oacute;n y el conflicto en el comportamiento animal, se dio cuando ambos comenzaron a concebirse como elementos implicados en la construcci&oacute;n y moldeamiento de las relaciones sociales (Kummer 1967). As&iacute;, se dej&oacute; atr&aacute;s un modelo enfocado exclusivamente en el individuo, para dar paso a lo que de Waal (1996) denomin&oacute; el "modelo relacional de la agresi&oacute;n" (ver <a href="#f1">Fig. 1</a>). Este postula que la agresi&oacute;n constituye una de entre varias alternativas de resoluci&oacute;n del conflicto e interviene significativamente en la modulaci&oacute;n de las relaciones sociales (de Waal 1996). El modelo reconoce que la agresi&oacute;n involucra usualmente a individuos con un historial de interacciones e integra el fen&oacute;meno de la agresi&oacute;n a la vida social de los animales gregarios, caracterizada por la ocurrencia habitual de situaciones de conflicto.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/azm/v30n3/a15f1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">Los animales gregarios son particularmente sensibles a las consecuencias negativas de los conflictos agresivos, pues la vida grupal es una adaptaci&oacute;n (Bertrand 1978; Wrangham 1980; Rubinstein &amp; Wrangham 1986; Krause &amp; Ruxton 2002; Silk 2007) ante diversas presiones selectivas (<i>e.g.</i>, depredaci&oacute;n, b&uacute;squeda de parejas reproductivas, forrajeo eficiente). Las modificaciones a las caracter&iacute;sticas estructurales o din&aacute;micas del grupo, aproximan o alejan a sus miembros de las condiciones &oacute;ptimas para vivir en &eacute;l. En el caso de los primates gregarios y de otros animales que viven en sociedades similares, los efectos negativos de la agresi&oacute;n ponen en riesgo la inversi&oacute;n efectuada en el desarrollo de las relaciones sociales y afectan la posici&oacute;n social de los individuos involucrados, los cuales se encuentran inmersos en una compleja red de alianzas (de Waal &amp; Aureli 1997). Dicha situaci&oacute;n puede ser considerada una presi&oacute;n de selecci&oacute;n para la aparici&oacute;n de mecanismos que permitan contrarrestar los efectos negativos de los conflictos agresivos. Tal es el caso de las afiliaciones postconflicto.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Las afiliaciones postconflicto: una visi&oacute;n general</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El comportamiento afiliativo es aquel que promueve la proximidad no agon&iacute;stica entre los individuos involucrados y, en el caso de los animales gregarios, la cohesi&oacute;n del grupo (Cords 1997). En primates, m&aacute;s del 80% de las interacciones sociales son de tipo afiliativo (Sussman <i>et al.</i> 2005). Lo anterior ilustra la importancia de tales conductas en la vida cotidiana de los primates gregarios.</font></p>  	    <p align="justify"><font face="verdana" size="2">Una de las funciones postuladas para el comportamiento afiliativo, es el amortiguamiento de los costos sociales asociados a la resoluci&oacute;n de situaciones de conflicto a trav&eacute;s de la agresi&oacute;n; i.e. aumento de la probabilidad de nuevas agresiones <i>(e.g.,</i> Aureli 1992; Kutsukake &amp; Castles 2001; McFarland &amp; Majolo 2011), disminuci&oacute;n de la tolerancia entre los oponentes (<i>e.g.</i>, Cords 1992; Cords &amp; Thurnheer 1993), aumento de la distancia interindividual <i>(e.g.,</i> Sommer <i>et al.</i> 2002). Este ser&iacute;a el caso de las afiliaciones entre los oponentes previos en las postrimer&iacute;as de un conflicto agresivo (en lo sucesivo APC), tambi&eacute;n conocidas como "reconciliaci&oacute;n" (de Waal &amp; van Rosemalen 1979), las cuales representan el tipo de interacci&oacute;n postconflicto m&aacute;s estudiada. La <a href="/img/revistas/azm/v30n3/a15f2.jpg" target="_blank">figura 2</a> ilustra este proceso. Aunque existen reportes anecd&oacute;ticos sobre las APC en varias especies al menos desde finales de los a&ntilde;os sesenta del siglo XX , el primer estudio sistem&aacute;tico sobre el tema fue efectuado por de Waal &amp; van Rosemalen (1979), quienes documentaron su ocurrencia en un grupo de chimpanc&eacute;s en cautiverio y los patrones conductuales caracter&iacute;sticos de estos eventos.</font></p>  	    <p align="justify"><font face="verdana" size="2">El re&#45;descubrimiento de las APC influy&oacute; significativamente en los estudios posteriores sobre la funci&oacute;n de la agresi&oacute;n y su relaci&oacute;n con otros fen&oacute;menos sociales, ubic&aacute;ndola en un contexto de conflicto de intereses y de negociaci&oacute;n de las relaciones sociales. Durante las &uacute;ltimas tres d&eacute;cadas, numerosos estudios han arrojado una vasta cantidad de informaci&oacute;n sobre las condiciones que conducen a la ocurrencia, variaci&oacute;n y posibles funciones de las APC entre los oponentes. Dicha informaci&oacute;n es resumida y analizada a continuaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>La funci&oacute;n de las APC entre los oponentes</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El t&eacute;rmino "reconciliaci&oacute;n" implica la funci&oacute;n propuesta para este tipo de APC. No obstante, no todos los autores concuerdan en que la funci&oacute;n de estas interacciones consista en reparar los da&ntilde;os causados a la relaci&oacute;n entre los oponentes como consecuencia de la agresi&oacute;n previa (<i>e.g.</i>, Silk 1997, 2002). S&oacute;lo una fracci&oacute;n de los estudios ha investigado el efecto de las APC sobre la din&aacute;mica de las relaciones sociales a mediano y largo plazo (<i>e.g.</i>, Koyama 2001, Silk <i>et al.</i> 1996). Al respecto, Cords (1993) y Silk (1997) se&ntilde;alan que es una pr&aacute;ctica com&uacute;n dar por hecho que la funci&oacute;n reparadora de la "reconciliaci&oacute;n" se alcanza si los criterios operacionales de su definici&oacute;n se cumplen. En este escrito preferimos el uso del t&eacute;rmino APC, dado que presenta menores implicaciones funcionales.</font></p>  	    <p align="justify"><font face="verdana" size="2">Dos hip&oacute;tesis han orientado el grueso de los estudios sobre la funci&oacute;n de las APC entre los oponentes: a) la APC como medio de restauraci&oacute;n de la relaci&oacute;n social ante los efectos negativos de la agresi&oacute;n (i.e., hip&oacute;tesis restauradora/hip&oacute;tesis de la relaci&oacute;n valiosa: de Waal &amp; Aureli 1997), y b) la APC como se&ntilde;al para comunicar la finalizaci&oacute;n del conflicto agresivo y la disposici&oacute;n de los oponentes para interactuar pac&iacute;ficamente (<i>i.e.</i>, hip&oacute;tesis de las buenas intenciones: Silk 2002).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>La hip&oacute;tesis de la relaci&oacute;n valiosa</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La funci&oacute;n restauradora de las APC entre los oponentes ha orientado la mayor&iacute;a de las discusiones sobre el t&oacute;pico desde la publicaci&oacute;n de de Waal &amp; van Rosemalen (1979) y se incorpora expl&iacute;citamente en la hip&oacute;tesis de la relaci&oacute;n valiosa (de Waal &amp; Aureli 1997). Esta predice que las APC ser&aacute;n m&aacute;s probables entre aquellos animales que mantienen un v&iacute;nculo valioso <i>(i.e.,</i> que influye positivamente en la adecuaci&oacute;n biol&oacute;gica de los actores, Kumer 1978), pues su ocurrencia permite proteger los beneficios derivados de la relaci&oacute;n ante los efectos negativos de la agresi&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">La forma en que se determina el valor del v&iacute;nculo est&aacute; sujeta a controversias, pues mientras numerosos autores lo han inferido a partir de la frecuencia de conductas como el aseo social y la proximidad entre los actores de una d&iacute;ada (Watts 2006), Cords &amp; Aureli (2000) se&ntilde;alan que los niveles de afiliaci&oacute;n entre los actores pudiesen ser un mero reflejo de su compatibilidad, mas no del valor de su relaci&oacute;n. A pesar de ello, el inferir el valor de la relaci&oacute;n con base en la frecuencia de las conductas afiliativas entre los actores es una pr&aacute;ctica com&uacute;n en los estudios sobre APC.</font></p>  	    <p align="justify"><font face="verdana" size="2">Diversos estudios justifican la inferencia del valor de la relaci&oacute;n a partir de la frecuencia de las interacciones afiliativas. La fortaleza de los v&iacute;nculos afiliativos se relaciona con beneficios individuales en t&eacute;rminos de higiene (Hutchins &amp; Barash 1976; Tanaka &amp; Takefushi 1993; Zamma 2002), reducci&oacute;n del estr&eacute;s (Schino <i>et al.</i> 1988; Aureli <i>et al.</i> 1999; Engh <i>et al.</i> 2005; Wittig <i>et al.</i> 2008), tolerancia (Ventura <i>et al.</i> 2006; Richter <i>et al.</i> 2009; Tiddi <i>et al.</i> 2011), apoyo agonista (Schino 2007), mejora del rango (Sch&uuml;lke <i>et al.</i> 2010), sobrevivencia (Yee <i>et al.</i> 2008; Beehner <i>et al.</i> 2010; Holt&#45;Lunstad <i>et al.</i> 2010; Silk 2010), oportunidades de apareamiento (Gumert 2007) y &eacute;xito reproductivo (Silk <i>et al.</i> 2003; Cameron <i>et al.</i> 2009; Fr&egrave;re <i>et al.</i> 2010; Sch&uuml;lke <i>et al.</i> 2010; Massen <i>et al.</i> 2012). Adicionalmente, los conflictos entre animales que mantienen fuertes v&iacute;nculos afiliativos se relacionan con un incremento de mayor magnitud en los indicadores de ansiedad (Aureli <i>et al.</i> 1989; Aureli 1997; Romero <i>et al.</i> 2009), lo cual sugiere que el principal costo social de la agresi&oacute;n es la perturbaci&oacute;n del v&iacute;nculo entre los actores (Aureli <i>et al.</i> 1989; Aureli 1997).</font></p>  	    <p align="justify"><font face="verdana" size="2">Watts (2006) sugiere cuatro criterios que los estudios basados en la hip&oacute;tesis de la relaci&oacute;n valiosa deber&iacute;an perseguir para dar mayor solidez a sus conclusiones: 1) bases de datos de un tama&ntilde;o que permita la comparaci&oacute;n entre las distintas clases de d&iacute;adas e individuos que se presume var&iacute;an en el valor otorgado a sus relaciones sociales. 2) Datos acerca de la frecuencia, duraci&oacute;n y direcci&oacute;n de las interacciones empleadas para inferir el valor del v&iacute;nculo entre los actores (i.e. aseo social, formaci&oacute;n de coaliciones contra terceros, tolerancia para compartir recursos). 3) Evidencia de que la ocurrencia de las APC amortigua o nulifica los costos de la agresi&oacute;n. 4) Evidencia de que las interacciones consideradas en el segundo inciso se traducen en efectos positivos sobre el &eacute;xito reproductivo de los actores. Esto &uacute;ltimo es de particular importancia para demostrar que la funci&oacute;n de las APC consiste en preservar los beneficios de las relaciones valiosas.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>La hip&oacute;tesis de las buenas intenciones</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La propuesta alternativa est&aacute; dada por la hip&oacute;tesis de las buenas intenciones (Silk 1997, 2002), la cual plantea que las APC constituyen se&ntilde;ales honestas que comunican al adversario la finalizaci&oacute;n del conflicto y la intenci&oacute;n del emisor de no actuar m&aacute;s de manera agresiva, lo cual conduce al restablecimiento de la tolerancia entre los oponentes, permitiendo coordinar acciones mutuamente ben&eacute;ficas. Este planteamiento contrasta con los beneficios a largo plazo que sustentan a la hip&oacute;tesis de la relaci&oacute;n valiosa (de Waal &amp; Aureli 1997).</font></p>  	    <p align="justify"><font face="verdana" size="2">La evoluci&oacute;n de las APC como se&ntilde;ales supone un contexto de interacciones frecuentes entre los actores y la ausencia de una situaci&oacute;n de conflicto de intereses (i.e. los actores experimentar&iacute;an beneficios mutuos e inmediatos). Dicha situaci&oacute;n hace innecesaria la evoluci&oacute;n de se&ntilde;ales costosas y conspicuas que garanticen la veracidad de la informaci&oacute;n contenida en ellas (Krebs &amp; Dawkins 1984; Silk 1997). Incluso en el caso de que los actores se beneficiasen asim&eacute;tricamente de la interacci&oacute;n (i.e. existiese conflicto de intereses), las interacciones frecuentes entre ambos posibilitar&iacute;an la evoluci&oacute;n de se&ntilde;ales de bajo costo (Silk 1997) a trav&eacute;s de un mecanismo de altruismo rec&iacute;proco (Trivers 1971) o, en el caso de los parientes cercanos, de selecci&oacute;n de parentesco (Hamilton 1964a,b).</font></p>  	    <p align="justify"><font face="verdana" size="2">Una de las cr&iacute;ticas m&aacute;s controvertidas de Silk (1997) a la hip&oacute;tesis de la relaci&oacute;n valiosa, es que si la funci&oacute;n de las afiliaciones entre los oponentes consiste en reparar los da&ntilde;os causados a su relaci&oacute;n social por la agresi&oacute;n previa, la ocurrencia de dichas interacciones deber&iacute;a dar lugar a niveles de afiliaci&oacute;n por encima de la l&iacute;nea base en los d&iacute;as posteriores al conflicto. La evidencia al respecto es mixta. En babuinos cha&#45;cma <i>(Papio ursinus),</i> Silk <i>et al.</i> (1996) no encontraron diferencias en la frecuencia de afiliaci&oacute;n con respecto a sus niveles basales, entre las diadas que afilian despu&eacute;s de un conflicto agresivo y las que no, durante los 10 d&iacute;as posteriores al conflicto. En contraste, en macacos japoneses <i>(Macaca fuscata)</i> se report&oacute; que la APC entre los oponentes mantiene sus niveles basales de afiliaci&oacute;n y agresi&oacute;n en los 10 d&iacute;as posteriores al conflicto, en tanto que la ausencia de la afiliaci&oacute;n conduce a un incremento de la agresi&oacute;n y una disminuci&oacute;n de la afiliaci&oacute;n entre ambos con respecto a los niveles basales (Koyama 2001).</font></p>  	    <p align="justify"><font face="verdana" size="2">Cords &amp; Aureli (2000) argumentan que la hip&oacute;tesis de las buenas intenciones no contradice el supuesto de que la APC restaura la relaci&oacute;n entre los oponentes, limit&aacute;ndose a se&ntilde;alar los mecanismos que permiten preservar la relaci&oacute;n. Adicionalmente, se ha hecho notar que la hip&oacute;tesis de la relaci&oacute;n valiosa no predice el fortalecimiento de la relaci&oacute;n entre los actores como consecuencia de la APC, sino simplemente la minimizaci&oacute;n de los da&ntilde;os ocasionados a esta por la agresi&oacute;n previa (Aureli <i>et al.</i> 2002). No obstante, Silk (1997, 2002) hace &eacute;nfasis en que los razonamientos que subyacen a estas hip&oacute;tesis conducen a distintas predicciones, no siempre excluyentes, sobre sus patrones de ocurrencia (<a href="#c1">Cuadro 1</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="c1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/azm/v30n3/a15c1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>La hip&oacute;tesis integrada</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Aureli (1997) propone la llamada hip&oacute;tesis integrada para conjuntar las principales propuestas sobre la funci&oacute;n de la APC entre los oponentes. Esta postula que la ansiedad experimentada por los adversarios es consecuencia de la incertidumbre acerca del futuro de su relaci&oacute;n (Aureli <i>et al.</i> 1989; Aureli &amp; van Schaik 1991b) y que la intensidad de la ansiedad refleja el valor que otorgan al v&iacute;nculo. Con base en ello, predice que la APC ser&aacute; m&aacute;s probable entre individuos que mantienen un v&iacute;nculo estrecho, disminuyendo as&iacute; tanto la incertidumbre sobre el futuro de este, como la ansiedad resultante y permitiendo la preservaci&oacute;n de la relaci&oacute;n social. As&iacute;, se integra la evidencia de que la APC ocurre con mayor frecuencia entre diadas con v&iacute;nculos estrechos, con la evidencia de que la ocurrencia de la APC disminuye los niveles de ansiedad postconflicto experimentada por los oponentes. Numerosos estudios documentan estos efectos (revisiones en Arnold &amp; Aureli 2007; Aureli &amp; Schino 2004; Aureli <i>et al.</i> 2002).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">No obstante, ni la hip&oacute;tesis de la relaci&oacute;n valiosa (de Waal &amp; Aureli 1997), ni la hip&oacute;tesis integrada (Aureli 1997) ofrecen una respuesta los se&ntilde;alamientos efectuados por Silk (1997, 2002) con respecto a los mecanismos que posibilitaron la evoluci&oacute;n de las APC. Adicionalmente, es necesario se&ntilde;alar que la evidencia presentada por la mayor&iacute;a de los estudios sobre los efectos de las APC entre los oponentes, se limita a eventos que tienen lugar en los minutos posteriores al conflicto <i>(e.g.,</i> disminuci&oacute;n de la ansiedad, variaci&oacute;n en los niveles de afiliaci&oacute;n y agresi&oacute;n entre los oponentes), dificultando la elaboraci&oacute;n de conclusiones sobre sus efectos a largo plazo.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>La ocurrencia de las APC entre los oponentes</b></font></p>  	    <p align="justify"><font face="verdana" size="2">M&aacute;s all&aacute; de las controversias acerca de su funci&oacute;n, la ocurrencia de las APC entre los oponentes es un hecho bien comprobado. Esta se ha documentado en casi 40 especies de vertebrados, principalmente en primates (Aureli <i>et al.</i> 2002; Das 2000; Schino 2000; ver <a href="#c2">Cuadro 2</a>). Los estudios han sido conducidos tanto en condiciones de libertad como de cautiverio y en ambos contextos se ha obtenido evidencia positiva. Dicha situaci&oacute;n reduce la posibilidad de que las APC sean un artefacto resultante de las restricciones impuestas por el cautiverio (revisi&oacute;n en Colmenares 2006).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="c2"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/azm/v30n3/a15c2.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Fuentes de variaci&oacute;n en la ocurrencia de las APC entre los oponentes</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Diversas variables han sido asociadas a la probabilidad de que los oponentes interact&uacute;en amistosamente en las postrimer&iacute;as de un episodio agresivo (revisiones en Arnold &amp; Aureli 2007; Aureli <i>et al.</i> 2002). Simplificando el esquema propuesto por Arnold &amp; Aureli (2007), la mayor&iacute;a de las variables pueden ser resumidas en dos categor&iacute;as: contextuales y relacionales.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>I. Variables contextuales</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>A. Intensidad del conflicto y distancia interindividual</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La intensidad del conflicto podr&iacute;a influir en la ocurrencia de la APC a trav&eacute;s de la ansiedad generada en los oponentes y los efectos relajantes de la afiliaci&oacute;n (ver secci&oacute;n previa sobre la hip&oacute;tesis integrada), o como resultado de la distancia interindividual al finalizar el conflicto. No obstante, la evidencia al respecto es escasa (revisi&oacute;n en Arnold &amp; Aureli 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">Algunos modelos computacionales (i.e. modelos de auto&#45;organizaci&oacute;n) sugieren que patrones sociales considerados complejos, como la "reconciliaci&oacute;n", pueden ser producto de variables como la mera distancia interindividual (<i>e.g.</i>, Hemelrijk 2011).</font></p>  	    <p align="justify"><font face="verdana" size="2">En el macaco cola de mu&ntilde;&oacute;n <i>(M. arctoides)</i> y en el macaco rhesus <i>(M. mulatta),</i> la distancia interindividual al finalizar los conflictos parece relacionarse con el estilo de dominancia de cada especie (i.e. tolerante vs. intolerante) y la tendencia conciliatoria observada (Call 1999; Call <i>et al.</i> 1999). Resultados similares han sido reportados en chimpanc&eacute;s (Arnold &amp; Whitten 2001). M&aacute;s all&aacute; de estos reportes, el efecto de la distancia postconflicto sobre la ocurrencia de la APC ha sido escasamente estudiado y representa una l&iacute;nea de investigaci&oacute;n de gran parsimonia para explicar la variaci&oacute;n observada a nivel intra&#45; e interespec&iacute;fico.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>B.&nbsp;Claridad del resultado</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se ha postulado que la claridad en el resultado del encuentro agonista, expresada en la ausencia de contra&#45;agresiones o en la emisi&oacute;n de se&ntilde;ales de sumisi&oacute;n por uno de los oponentes, se relaciona con la incertidumbre sobre el curso de la relaci&oacute;n despu&eacute;s de la agresi&oacute;n y la ansiedad resultante (Aureli <i>et al.</i> 1989), afectando la motivaci&oacute;n de los oponentes para llevar a cabo la APC. No obstante, la mayor&iacute;a de los estudios que han considerado esta variable, reportan la ausencia de alg&uacute;n tipo de efecto (Arnold &amp; Aureli 2007). De las escasas investigaciones que han encontrado evidencia sobre la relaci&oacute;n entre la claridad del resultado y la ocurrencia de las APC, algunas reportan un efecto positivo (Aureli <i>et al.</i> 1989; Petit &amp; Thierry 1994) y en otros casos negativo (Cooper <i>et al.</i> 2007). En general, la importancia de dicha variable en la ocurrencia de las APC pareciera ser baja.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>C.&nbsp;Estacionalidad y temporada reproductiva</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Pocos estudios han explorado los efectos de estas variables, aun cuando es de esperar que ambas afecten la intensidad de la competencia por el acceso a los recursos f&iacute;sicos y sociales, la tolerancia interindividual y la tendencia conciliatoria (i.e., porcentaje de conflictos seguidos de una APC; ver Veenema <i>et al.</i> 1994).</font></p>  	    <p align="justify"><font face="verdana" size="2">La temporada reproductiva ha sido investigada como una variable que podr&iacute;a incrementar la competencia y el conflicto intersexual. En especies con reproducci&oacute;n estacional, la sincronizaci&oacute;n reproductiva de las hembras afectar&iacute;a el potencial de los machos para monopolizar el acceso sexual a estas (Kappeler, 2000), aumentando en algunos casos <i>(e.g.,</i> grupos altamente cohesivos) la competencia intrasexual en la forma de contienda <i>(contest competition)</i> y afectando los niveles de afiliaci&oacute;n y agresi&oacute;n (Horiuchi 2005; Lin <i>et al.</i> 2008). Al menos dos estudios han encontrado evidencia de que la temporada reproductiva afecta la ocurrencia de las APC.</font></p>  	    <p align="justify"><font face="verdana" size="2">Schino <i>et al.</i> (1998) reportan una disminuci&oacute;n de la ocurrencia de las APC y de los niveles de afiliaci&oacute;n en general, entre macacos japoneses durante la temporada de apareamiento. Del mismo modo, Majolo &amp; Koyama (2006) reportan que en esta especie las APC entre hembras disminuyen durante la temporada reproductiva y cuando una o ambas rivales se encuentran en estro. Otros estudios sugieren que no existen diferencias en la ocurrencia de las APC asociadas a la temporada reproductiva o al ciclo ovulatorio de las hembras en primates (revisi&oacute;n en Arnold &amp; Aureli 2007) y posiblemente tampoco en otras especies (<i>e.g.</i>, <i>Suricata suricata:</i> Kutsukake &amp; Clutton&#45;Brock 2008). Es posible que en aquellos casos en donde la sincronizaci&oacute;n reproductiva y una amplia distribuci&oacute;n espacial de las hembras disminuyen el potencial de los machos para monopolizar el apareamiento, la competencia intrasexual adquiera la forma de "rebatinga" (i.e. <i>scramble competition)</i> y los efectos de la temporada reproductiva sobre la ocurrencia de la APC sean m&iacute;nimos o nulos.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Con respecto a la estacionalidad, s&oacute;lo el estudio de Majolo &amp; Koyama (2006) ha explorado los efectos de esta variable sobre la ocurrencia de las APC, sin encontrar evidencia al respecto. El supuesto que subyace a su estudio es que la variaci&oacute;n en la abundancia y distribuci&oacute;n de los recursos alimentarios se relaciona con la intensidad de la competencia en la forma de contienda. Es posible que la ausencia de efectos reportada en esta investigaci&oacute;n obedezca a que las interacciones de inter&eacute;s se dan en el contexto del forrajeo, situaci&oacute;n que se analiza en el siguiente apartado.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>D. Competencia por alimento</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los estudios que han considerado esta variable coinciden en se&ntilde;alar que las agresiones ocurridas en el contexto de la disputa por recursos alimentarios raras veces conducen a la ocurrencia de las APC (Aureli 1992; Aureli &amp; van Schaik 1991a; Castles &amp; Whiten 1998; Verbeeck &amp; de Waal 1997). Al parecer, los animales asignan este tipo de eventos a una categor&iacute;a especial que no implica el deterioro de sus relaciones sociales o la incertidumbre sobre el curso de los eventos posteriores al conflicto agresivo y hace innecesaria la APC. Es posible que los beneficios obtenidos de manera inmediata (i.e. alimento) superen a los costos resultantes de la agresi&oacute;n (<i>e.g.</i>, deterioro m&iacute;nimo de la relaci&oacute;n social), haciendo infructuoso cualquier intento de negociaci&oacute;n entre los oponentes.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>II. Variables relacionales</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>A.&nbsp;Parentesco</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los efectos del parentesco sobre la ocurrencia de las APC han sido investigados en el marco de la hip&oacute;tesis de la relaci&oacute;n valiosa (de Waal &amp; Aureli 1997). El supuesto que subyace a estos estudios es que las relaciones entre parientes cercanos poseen un alto valor intr&iacute;nseco, debido a sus efectos sobre el &eacute;xito reproductivo del individuo <i>(i.e.,</i> adecuaci&oacute;n inclusiva, Hamilton 1964a, b). Con base en lo anterior, se espera que los beneficios de las APC sean mayores para las d&iacute;adas conformadas por parientes cercanos y que estas se caractericen por una mayor tendencia conciliatoria. Los resultados de numerosos estudios indican que el parentesco generalmente ejerce un efecto positivo en la ocurrencia de las APC (revisiones en Aureli <i>et al.</i> 2002; Arnold &amp; Aureli 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>B.&nbsp;Fortaleza del v&iacute;nculo</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La relaci&oacute;n entre la ocurrencia de la APC y la fortaleza del v&iacute;nculo entre los oponentes ha sido ampliamente investigada. Las d&iacute;adas con v&iacute;nculos estrechos se caracterizan por una alta frecuencia de interacciones que involucran aseo social, proximidad pac&iacute;fica y apoyo agonista (Cords 1997; Silk 2002). Numerosos estudios se&ntilde;alan que la fortaleza del v&iacute;nculo se relaciona positivamente con la ocurrencia de la APC <i>(e.g.,</i> Castles <i>et al.</i> 1996; Berman <i>et al.</i> 2006; Koski <i>et al.</i> 2007; Patzelt <i>et al.</i> 2009; de la O <i>et al.</i> 2013). Con base en ello, algunos autores han considerado esta variable como un proxy al valor de la relaci&oacute;n entre los adversarios y discutido los resultados de sus estudios en el marco de la hip&oacute;tesis de la relaci&oacute;n valiosa (revisi&oacute;n en Watts 2006).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>C.&nbsp;Sexo de los oponentes</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Seg&uacute;n diferentes caracter&iacute;sticas de la especie estudiada (i.e. patrones de dispersi&oacute;n y relaciones de parentesco entre los miembros del grupo, intensidad del conflicto intra&#45; e intersexual), es de esperar que el valor de la relaci&oacute;n social entre las diferentes clases de d&iacute;adas var&iacute;e en funci&oacute;n del sexo y los intereses de los actores involucrados, e influya en la ocurrencia de las APC.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Por ejemplo, en gorilas de la monta&ntilde;a <i>(Gorilla beringei beringei),</i> la mayor&iacute;a de los grupos est&aacute;n constituidos por un macho adulto claramente dominante sobre un n&uacute;mero reducido de machos y varias hembras con su descendencia (Stewart &amp; Harcourt 1987). El macho dominante interviene en los conflictos sociales entre hembras y ofrece protecci&oacute;n a estas y a sus cr&iacute;as en contra de depredadores, grupos rivales y machos ajenos al grupo. Las hembras por su parte, interact&uacute;an frecuentemente con el macho dominante y tienen escasas interacciones afiliativas y cooperativas entre ellas (Stewart &amp; Harcourt 1987). En esta especie las APC ocurren entre el macho dominante y las hembras, pero no entre las hembras (Watts 1995). Resultados similares han sido reportados en los gorilas de tierras bajas <i>(Gorilla gorilla gorilla:</i> Mallava&#45;rapu <i>et al.</i> 2006).</font></p>  	    <p align="justify"><font face="verdana" size="2">En contraste, en las especies estructuradas por las relaciones entre las hembras <i>(female bonded societies:</i> Wrangham 1980), como es el caso de los cercopitecinos (subfamilia cercopitecinae, <i>e.g.</i>, langures, macacos, babuinos), las hembras generalmente mantienen fuertes relaciones afiliativas sesgadas por el parentesco (Melnick &amp; Pearl 1987), lo cual se refleja en la ocurrencia y distribuci&oacute;n de las APC. En los langures Hanum&aacute;n <i>(Semnopithecus entellus),</i> los grupos generalmente est&aacute;n conformados por un solo macho adulto y varias hembras con sus cr&iacute;as. Cada cierto tiempo (45 meses aproximadamente), conflictos con bandas de machos for&aacute;neos por la posesi&oacute;n del grupo de hembras conducen a la sustituci&oacute;n del macho residente (Newton 1987; Farid Ahsan &amp; Reza Khan 2006). Cuando un nuevo macho se apodera del grupo, el riesgo de infanticidio es grande y las hembras intentan cooperar para resistir los intentos infanticidas del nuevo macho. El valor de las relaciones entre hembras parece ser alto y, en apoyo de este supuesto, las APC ocurren exclusivamente en las d&iacute;adas conformadas por hembras (Sommer <i>et al.</i> 2002).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>D.&nbsp;Asimetr&iacute;a de rango</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La accesibilidad del oponente como compa&ntilde;ero social podr&iacute;a afectar la ocurrencia y frecuencia de las APC. Seg&uacute;n el modelo de Seyfarth (1977), los individuos de rango similar constituyen opciones m&aacute;s accesibles para interactuar, dada la competencia por el acceso a los compa&ntilde;eros de alto rango, por lo que la distribuci&oacute;n de las afiliaciones deber&iacute;a reflejar dicha accesibilidad. La predicci&oacute;n ha sido confirmada por Schino (2001) a trav&eacute;s de un meta&#45;an&aacute;lisis de la distribuci&oacute;n del aseo social en 14 especies de primates. Con base en este patr&oacute;n general de afiliaci&oacute;n, es posible predecir que los animales de rango similar tendr&aacute;n mayores posibilidades de reconciliar (Silk <i>et al.</i> 1996).</font></p>  	    <p align="justify"><font face="verdana" size="2">Algunos estudios en cercopitecinos han encontrado evidencia a favor de dicha predicci&oacute;n (Castles &amp; Whiten 1998; Judge 1991; Silk <i>et al.</i> 1996). No obstante, en el caso del estudio efectuado por Silk <i>et al.</i> (1996) en babuinos de la sabana <i>(Papio cynocephalus ursinus),</i> al controlar estad&iacute;sticamente los efectos del parentesco (las hembras estrechamente emparentadas suelen tener rangos similares en numerosas especies de cercopitecinos: Melnick &amp; Pearl 1987) el efecto de la asimetr&iacute;a del rango desapareci&oacute;. Por su parte, Palagi <i>et al.</i> (2008) reportan que en sifacas de Verreaux <i>(Propithecus verreauxi),</i> las d&iacute;adas conformadas por animales con mayor diferencia en el rango reconcilian una mayor proporci&oacute;n de sus conflictos agresivos.</font></p>  	    <p align="justify"><font face="verdana" size="2">En general, la evidencia acerca de la relaci&oacute;n entre la asimetr&iacute;a del rango y la ocurrencia de las APC es escasa e inconsistente. No obstante, es posible que otro tipo de asimetr&iacute;as entre los oponentes influyan en la ocurrencia de las APC (<i>e.g.</i>, la asimetr&iacute;a en los costos de la agresi&oacute;n: McFarland &amp; Majolo 2011).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>III. Otras fuentes de variaci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>A. Se&ntilde;ales filogen&eacute;ticas</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La ocurrencia de las APC podr&iacute;a depender de factores distintos a las caracter&iacute;sticas de la diada y de la situaci&oacute;n en la cual ha tenido lugar el conflicto agresivo, como la existencia de diferencias interespec&iacute;ficas en la disposici&oacute;n para llevarla a cabo. De manera m&aacute;s general, los patrones de comportamiento postconflicto podr&iacute;an formar parte de un conjunto m&aacute;s amplio de rasgos sociales que caracterizan a la especie. En apoyo de esta idea, algunos estudios en primates (Di Fiore &amp; Rendall 1994; Therry <i>et al.</i> 2000) han demostrado la covariaci&oacute;n de ciertas caracter&iacute;sticas sociales entre especies. Balasubraniam <i>et al.</i> (2012) sugieren que algunas caracter&iacute;sticas sociales se encuentran interrelacionadas y son altamente heredables (i.e., s&iacute;ndromes conductua&#45;les), constituyendo estrategias evolutivamente estables adoptadas en respuesta a las condiciones ecol&oacute;gicas encaradas por los ancestros de las especies estudiadas. As&iacute;, es de esperar que las relaciones evolutivas entre las especies comparadas afecten la variabilidad de los caracteres investigados, <i>i.e.,</i> que aquellas especies que evolucionaron m&aacute;s recientemente a partir de un ancestro com&uacute;n sean m&aacute;s parecidas entre s&iacute; (Nunn &amp; Barton 2001; Blomberg <i>et al.</i> 2003).</font></p>  	    <p align="justify"><font face="verdana" size="2">En especies del g&eacute;nero <i>Macaca,</i> la variabilidad interespec&iacute;fica de diversas caracter&iacute;sticas sociales, incluyendo la tendencia conciliatoria, ha sido relacionada con la cercan&iacute;a filogen&eacute;tica de las especies comparadas (Matsumara 1999; Thierry 2000; Balasubraniam <i>et al.</i> 2012). Thierry <i>et al.</i> (2008) reportan que la variaci&oacute;n observada en la tendencia conciliatoria entre individuos no emparentados de nueve especies de macacos, refleja el grado de cercan&iacute;a filogen&eacute;tica entre estas especies. La variaci&oacute;n entre especies result&oacute; varias veces mayor a la observada entre grupos de la misma especie (Thierry <i>et al.</i> 2008), tal como lo predice el modelo filogen&eacute;tico (Balasubraniam <i>et al.</i> 2012). El resultado no descarta la posibilidad de que parte de la variaci&oacute;n observada represente una adaptaci&oacute;n a las condiciones ecol&oacute;gicas experimentadas en el presente por las especies y grupos comparados (<i>e.g.</i>, de Waal &amp; Johanowicz 1993), pero indica que la capacidad de respuesta a estas se encuentra restringida por disposiciones innatas que reflejan la historia evolutiva de la especie.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Perspectivas en el estudio de las APC</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La amplia discusi&oacute;n sobre la forma y funci&oacute;n de las APC entre los oponentes, en primates y en menor medida en otros animales, resalta la importancia de tales interacciones en la resoluci&oacute;n de los conflictos sociales, ilustrando cu&aacute;n compleja y din&aacute;mica es la vida social de los animales gregarios. Treinta a&ntilde;os de investigaci&oacute;n no han agotado el inter&eacute;s por el tema. En esta &uacute;ltima parte de nuestro escrito se&ntilde;alamos algunos temas que son motivo de controversia, o que consideramos han sido insuficientemente investigados y ameritan ser abordados en investigaciones futuras.</font></p>  	    <p align="justify"><font face="verdana" size="2">&iquest;Los beneficios de las APC se experimentan en el largo plazo en la forma de la preservaci&oacute;n del v&iacute;nculo entre los oponentes o en el corto plazo en la minimizaci&oacute;n de los costos del conflicto? Tal como Silk (1997, 2002) ha hecho notar, la funci&oacute;n atribuida a la APC entre los oponentes y el momento en que se experimentan sus efectos, conducen a diferentes predicciones sobre sus patrones de ocurrencia y los mecanismos que hicieron posible su evoluci&oacute;n. Aunque formuladas expl&iacute;citamente (ver Silk 1997), estas predicciones han recibido escasa atenci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">Por ejemplo, Silk (1997) predice que las APC deber&aacute;n ser infrecuentes, si estas constituyen se&ntilde;ales honestas que anuncian al oponente la intenci&oacute;n de no volver a actuar agresivamente en el futuro. Contrario a esta predicci&oacute;n, la ocurrencia de las APC se encuentra lejos de ser un evento infrecuente. La tendencia conciliatoria en las especies en las cuales se ha reportado la ocurrencia de las APC var&iacute;a entre un 6 y 77% (Arnold &amp; Aureli 2007). La alta frecuencia de APC entre los oponentes representa dificultades en t&eacute;rminos de los efectos a largo plazo asociados a su presunta funci&oacute;n restauradora <i>(i.e.,</i> prevenir el deterioro de la relaci&oacute;n a trav&eacute;s de la promesa de no agresi&oacute;n) y requiere clarificar tanto los beneficios, como los mecanismos que dieron lugar a su evoluci&oacute;n (i.e. altruismo rec&iacute;proco, mutualismo, selecci&oacute;n por parentesco).</font></p>  	    <p align="justify"><font face="verdana" size="2">La relativa frecuencia de las APC no descarta la posibilidad de que su funci&oacute;n consista en restaurar la relaci&oacute;n entre los oponentes, a&uacute;n bajo el supuesto de que las APC constituyan una se&ntilde;al que comunica al receptor las intenciones a largo plazo del emisor. El mensaje contenido en la APC pude ser distinto a una promesa de no agresi&oacute;n, por lo cual la honestidad del mismo no estar&iacute;a comprometida por la frecuencia de su emisi&oacute;n. Las APC podr&iacute;an representar una se&ntilde;al que comunica el inter&eacute;s de los oponentes en mantener la relaci&oacute;n y minimiza la importancia de la agresi&oacute;n previa. De ser as&iacute;, la emisi&oacute;n de tales se&ntilde;ales puede ser frecuente y la ausencia ellas deber&iacute;a traducirse en alteraciones a largo plazo en la calidad del v&iacute;nculo entre los oponentes. Aunque consistente con la hip&oacute;tesis de la relaci&oacute;n valiosa, esta posibilidad presenta escasa relaci&oacute;n con la acepci&oacute;n habitual del t&eacute;rmino "reconciliaci&oacute;n" e invita al uso de una terminolog&iacute;a estructural que evite anticipar conclusiones sobre la funci&oacute;n del comportamiento.</font></p>  	    <p align="justify"><font face="verdana" size="2">Alternativamente, si las APC no anuncian el comportamiento a largo plazo entre los actores, beneficios mutuos en el corto plazo pueden ser postulados. Estos podr&iacute;an consistir en la protecci&oacute;n de los actores en contra de los efectos negativos asociados a la agresi&oacute;n, como la ansiedad postconflicto (<i>e.g.</i>, Schino <i>et al.</i> 2007) y la escalada de la agresi&oacute;n (<i>e.g.</i>, Aureli 1992). En el caso de las interacciones entre parientes cercanos, tales beneficios pueden ser experimentados incluso de forma unilateral <i>(i.e.,</i> s&oacute;lo la v&iacute;ctima de la agresi&oacute;n se beneficia de la APC) si el beneficio otorgado al receptor de la conducta, degradado por el coeficiente de parentesco entre los actores, sobrepasa el costo asumido el por el emisor (selecci&oacute;n por parentesco: Hamilton 1964a,b).</font></p>  	    <p align="justify"><font face="verdana" size="2">Pocos estudios han explorado el costo&#45;beneficio de la agresi&oacute;n entre parientes y su relaci&oacute;n con la ocurrencia de las APC. Las relaciones entre parientes involucran intereses compartidos, dados los efectos que ejerce el parentesco sobre la adecuaci&oacute;n inclusiva de los individuos (Hamilton 1964a, b). Con base en ello, los beneficios obtenidos por el ejercicio de la agresi&oacute;n hacia la parentela deben ser lo suficientemente grandes para sobrepasar los costos asociados a ella, tanto los experimentados directamente por el individuo, como los experimentados por el pariente. Cords &amp; Aureli (2000) han se&ntilde;alado que las relaciones sociales entre parientes cercanos pueden ser caracterizadas como "seguras" (i.e., los individuos asignan una escasa probabilidad a que el tenor de la relaci&oacute;n se vea modificado), lo cual tiene sentido en un contexto de interdependencia. Por ello, es de esperar que las interacciones agresivas entre parientes dif&iacute;cilmente conduzcan a acciones encaminadas a preservar su relaci&oacute;n. La evidencia sobre los patrones de ocurrencia de las APC contradice la predicci&oacute;n: en la mayor&iacute;a de los estudios, el parentesco se relaciona positivamente con la ocurrencia de las APC (revisiones en Aureli <i>et al.</i> 2002; Arnold &amp; Aureli 2007). Tal situaci&oacute;n sugiere una funci&oacute;n distinta a la preservaci&oacute;n del v&iacute;nculo entre los actores.</font></p>  	    <p align="justify"><font face="verdana" size="2">Con base en lo anterior ofrecemos algunas predicciones: 1) Dado el contexto de intereses compartidos entre parientes, la escalada de la agresi&oacute;n aumentar&iacute;a los costos resultantes, por lo cual la ausencia de la APC entre parientes no dar&aacute; lugar a agresiones recurrentes en los minutos posteriores a la finalizaci&oacute;n del conflicto, ni modificar&aacute; en el largo plazo el tenor de la relaci&oacute;n. 2) Por lo anterior, es de esperar que la seguridad del v&iacute;nculo entre parientes cercanos <i>(sensu</i> Cords &amp; Aureli 2000) se vea reflejada en bajos niveles de ansiedad postconflicto. Niveles de ansiedad postconflicto por encima de la l&iacute;nea base sugerir&iacute;an una fuente distinta a la incertidumbre sobre el futuro de la relaci&oacute;n. 3) El principal costo de la agresi&oacute;n entre parientes ser&aacute; el riesgo de atraer agresiones por parte de terceros (<i>e.g.</i>, Aureli &amp; van Schaik 1991a; Aureli 1992) y la ocurrencia de la APC proteger&aacute; a los actores ante dicha posibilidad. 4) A mayor probabilidad de que uno de los oponentes (<i>e.g.</i>, los animales subordinados en especies con un estilo social desp&oacute;tico&#45;intolerante) sufra agresiones subsiguientes por terceros, mayor ser&aacute; la tendencia conciliatoria entre parientes.</font></p>  	    <p align="justify"><font face="verdana" size="2">La mayor&iacute;a de los estudios efectuados a la fecha han adoptado la hip&oacute;tesis de la relaci&oacute;n valiosa como gu&iacute;a (revisiones en Aureli <i>et al.</i> 2002; Watts 2006). No obstante, y a&uacute;n a la luz de la evidencia sobre el efecto positivo de los v&iacute;nculos afiliativos sobre el &eacute;xito reproductivo, la discusi&oacute;n sobre la funci&oacute;n de las APC permanece abierta. En este contexto, destaca la escasez de estudios acerca de los efectos a largo plazo de estas interacciones sobre la calidad del v&iacute;nculo entre los oponentes, o sobre la extensi&oacute;n y fortaleza de sus redes sociales. Dichos estudios son indispensables para determinar la validez de los postulados de la hip&oacute;tesis de la relaci&oacute;n valiosa (Silk 2002).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&iquest;Es suficiente un acto aislado para modificar el tenor de la relaci&oacute;n entre los actores? Pocos estudios han tomado en cuenta en su dise&ntilde;o el efecto acumulativo de las interacciones previas sobre las subsecuentes (<i>e.g.</i>, Cords &amp; Thurnheer 1993). Como Hinde (1976) ha se&ntilde;alado, las relaciones sociales son abstracciones efectuadas por el observador y los individuos involucrados, a partir de una serie de interacciones delimitadas en una ventana temporal. Las APC forman parte de este conjunto de interacciones, cuyo patr&oacute;n permite establecer el tenor de la relaci&oacute;n entre los actores (i.e. asignar un r&oacute;tulo a la relaci&oacute;n). Por lo anterior, resulta poco probable que la ocurrencia (o no) de una interacci&oacute;n aislada se traduzca en efectos a largo plazo sobre la relaci&oacute;n entre los oponentes.</font></p>  	    <p align="justify"><font face="verdana" size="2">Aunque Silk (1997) considera que dicha situaci&oacute;n imposibilita someter a prueba la hip&oacute;tesis de la relaci&oacute;n valiosa, nosotros consideramos que solamente hace necesaria la incorporaci&oacute;n de dise&ntilde;os de investigaci&oacute;n apropiados. As&iacute;, podemos predecir que la modificaci&oacute;n sistem&aacute;tica de la frecuencia de APC (<i>e.g.</i>, impedir su ocurrencia durante un periodo de tiempo), afectar&aacute; a largo plazo el tenor de la relaci&oacute;n. Dado que los estudios observacionales s&oacute;lo permiten establecer correlaciones entre la frecuencia de las APC y la variaci&oacute;n a largo plazo en la calidad del v&iacute;nculo entre los oponentes, la implementaci&oacute;n de protocolos experimentales ofrece la oportunidad de obtener evidencia acerca de las relaciones de causalidad presumidas (<i>e.g.</i>, Cords &amp; Thurnheer 1993).</font></p>  	    <p align="justify"><font face="verdana" size="2">Una alternativa a la dicotom&iacute;a entre la reparaci&oacute;n del v&iacute;nculo y la comunicaci&oacute;n del fin de las hostilidades, ha sido sugerida recientemente por McFarland y Majolo (2011). Los autores proponen que las APC representar&iacute;an un caso de coerci&oacute;n hacia la v&iacute;ctima por parte del agresor, para que la primera brinde aseo social bajo la amenaza de nuevas agresiones en caso de responder con una negativa. Nuevamente, el parentesco resulta cr&iacute;tico para dicha propuesta, pues la ocurrencia de las APC es m&aacute;s frecuente entre parientes, los cuales se espera tiendan a minimizar los costos de las interacciones agresivas entre ellos. No obstante, es posible que en el caso de individuos no emperentados, las APC se ajusten a lo propuesto por McFarland y Majolo (2011).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los patrones de comportamiento postconflicto forman parte de un conjunto m&aacute;s amplio de caracter&iacute;sticas sociales que han permitido clasificar algunas especies de primates en un continuo imaginario de estilos sociales (ver Thierry 2000, 2007), con los sistemas sociales "intolerantes" en un extremo (i.e., jerarqu&iacute;as de dominancia escarpadas, fuertes sesgos de parentesco en el comportamiento social, baja tolerancia interindividual, agresiones unidireccionales e intensas, baja tendencia conciliatoria) y los sistemas "tolerantes" en el otro. &iquest;Representan este conjunto de caracter&iacute;sticas sociales y en particular las APC, una disposici&oacute;n innata y relativamente inflexible, tal como sugieren algunos autores (<i>e.g.</i>, Di Fiore &amp; Rendall 1994; Thierry 2008; Thierry <i>et al.</i> 2008)? &iquest;O puede la alteraci&oacute;n de algunas variables sociales y ambientales dar lugar a modificaciones significativas en los patrones de ocurrencia de las APC (<i>e.g.</i>, de Waal &amp; Johanowitz 1983)? Una vez m&aacute;s, consideramos que la implementaci&oacute;n de arreglos experimentales que modifiquen aspectos clave de la estructura social (<i>e.g.</i>, el parentesco) representa una v&iacute;a para establecer el grado de flexibilidad de diversas caracter&iacute;sticas sociales y en particular, de los patrones de APC. Adicionalmente, las variaciones naturales en la estructura de los grupos ofrecen la oportunidad de realizar estudios con mayor validez externa, que documenten la capacidad de los organismos para modificar sus estrategias conductuales en respuesta a los desaf&iacute;os ecol&oacute;gicos.</font></p>  	    <p align="justify"><font face="verdana" size="2">Nuestra revisi&oacute;n revela la preponderancia de los estudios efectuados con primates catarrinos (familias Cercopithecidae, Hylobatidae y Hominidae). En particular, numerosos estudios han sido efectuados en especies de la familia Cercopithecidae, la mayor&iacute;a de las cuales comparten un modelo de organizaci&oacute;n social basada en las relaciones de parentesco entre hembras <i>(i.e., female bondedsocieties:</i> Wrangham 1980). La menor proporci&oacute;n de estudios efectuados en monos del Nuevo Mundo (familias Callitrichidae, Cebidae, Aotidae, Pitheciidae y Atelidae) y estrepsirrinos (infra&oacute;rde&#45;nes Lemuriformes, Chiromyiformes y Lorisiformes) ofrece la oportunidad de someter a prueba las hip&oacute;tesis propuestas, en modelos de organizaci&oacute;n social distintos a los que caracterizan a las especies empleadas en la mayor&iacute;a de las investigaciones. En este mismo sentido, los estudios en animales gregarios distintos a los primates permitir&aacute;n evaluar la generalidad e importancia de las APC entre los oponentes, el uso y frecuencia de estrategias alternativas para enfrentar las situaciones de conflicto (<i>e.g.</i>, interacciones que prevengan la escalada del conflicto: Mayagoitia <i>et al.</i> 1993; APC con terceros: de Waal &amp; van Rosemalen 1979), la relaci&oacute;n de los mecanismos de resoluci&oacute;n del conflicto con respecto a otros fen&oacute;menos sociales (<i>e.g.</i>, negociaci&oacute;n de servicios) y en un sentido m&aacute;s amplio, identificar las din&aacute;micas que estructuran las diversas sociedades animales.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>AGRADECIMIENTOS</b></font></p> 	    <p align="justify"><font face="verdana" size="2">El presente trabajo fue financiado por la beca 3000000,1 otorgada el Consejo Nacional de Ciencia y Tecnolog&iacute;a (CONACYT) al primer autor para la realizaci&oacute;n de sus estudios doctorales y es resultado de las investigaciones realizadas para la elaboraci&oacute;n de su tesis doctoral. Agradecemos a Javier Nieto y a Pilar Chiappa, los valiosos comentarios ofrecidos en la elaboraci&oacute;n del documento.</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>LITERATURA CITADA</b></font></p>  	    ]]></body>
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