<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2007-3364</journal-id>
<journal-title><![CDATA[Therya]]></journal-title>
<abbrev-journal-title><![CDATA[Therya]]></abbrev-journal-title>
<issn>2007-3364</issn>
<publisher>
<publisher-name><![CDATA[Asociación Mexicana de Mastozoología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-33642011000100004</article-id>
<article-id pub-id-type="doi">10.12933/therya-11-22</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Genética evolutiva y molecular de la familia Ursidae: una revisión bibliográfica actualizada]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Juárez-Casillas]]></surname>
<given-names><![CDATA[Luis Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Varas]]></surname>
<given-names><![CDATA[Cora]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología Colección Nacional de Mamíferos]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,University of Arizona Arizona Fish and Wildlife Research Unit School of Natural Resources]]></institution>
<addr-line><![CDATA[Tucson Arizona]]></addr-line>
<country>Estados Unidos de América</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2011</year>
</pub-date>
<volume>2</volume>
<numero>1</numero>
<fpage>47</fpage>
<lpage>65</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-33642011000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-33642011000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-33642011000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[No se conoce con precisión la relación taxonómica que guardan las ocho especies actuales de la Familia Ursidae. Sin embargo, de manera consistente los análisis demuestran tres principales grupos. El primero es la línea que origina al panda gigante, el segundo lleva a la aparición del oso de anteojos, y el tercero es una divergencia politípica que deriva en seis especies (negro americano, negro asiático, gris, polar, bezudo y malayo). La historia evolutiva de algunas especies de los osos no está conocida y posiblemente cambiará conforme nuevas evidencias tanto morfológicas, paleontológicas y moleculares estén disponibles. Así mismo, se aprecia en la literatura una diferencia en los valores de diversidad genética reportados para poblaciones de diferentes especies en este grupo de carnívoros dependiendo del grado de fragmentación de las poblaciones. Sin embargo, la variación depende también de la técnica molecular implementada.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The taxonomic relationships among the eight extant species of the Ursidae family are not well known; however, molecular genetics markers has consistently shown three major clades: the line that leads to the giant panda, the line that leads to the spectacled bear, and a polytomy lineage that results in six other species (American black bear, Asiatic black bear, polar bear, brown bear, sloth bear and sun bear). The phylogenetic relationship of some of the bear species is not well known and it may change with the development of new molecular markers, then, the controversies that surround the family of bears could be resolved. Also, literature shows variation in the genetic diversity values reported for the ursids due to the degree of fragmentation; however, the variation is also related to the molecular technique used.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Diversidad Genética]]></kwd>
<kwd lng="es"><![CDATA[Evolución]]></kwd>
<kwd lng="es"><![CDATA[Filogenia]]></kwd>
<kwd lng="es"><![CDATA[Ursidae]]></kwd>
<kwd lng="en"><![CDATA[Evolution]]></kwd>
<kwd lng="en"><![CDATA[Genetic Diversity]]></kwd>
<kwd lng="en"><![CDATA[Phylogeny]]></kwd>
<kwd lng="en"><![CDATA[Ursidae]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Gen&eacute;tica evolutiva y molecular</b> <b>de la familia Ursidae: una revisi&oacute;n bibliogr&aacute;fica</b> <b>actualizada</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>Luis Antonio Ju&aacute;rez&#45;Casillas<sup>1</sup> y Cora Varas<sup>2</sup></b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><sup><em>1</em></sup> <a href="mailto:ljuarez@ibiologia.unam.mx">ljuarez@ibiologia.unam.mx</a><i>; 01 (55) 56228222 ext. 47858, Colecci&oacute;n Nacional de Mam&iacute;feros, Instituto de Biolog&iacute;a, UNAM. 3er. Circuito Cultural; Apartado Postal 70&#45;153, Ciudad Universitaria, Coyoac&aacute;n, Ciudad de M&eacute;xico. D. F. 04510.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>2</sup></i> <a href="mailto:cora@email.arizona.edu">cora@email.arizona.edu</a><i>; _001 (520) 6212161, School of Natural Resources, Arizona Fish and Wildlife Research Unit. University of Arizona. Tucson, Arizona, 85721.</i></font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Sometido: 1 de Septiembre de 2010    <br> 	Revisado: 21 de febrero de 2011    <br> 	Aceptado: 5 de marzo de 2011</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">No se conoce con precisi&oacute;n la relaci&oacute;n taxon&oacute;mica que guardan las ocho especies actuales de la Familia Ursidae. Sin embargo, de manera consistente los an&aacute;lisis demuestran tres principales grupos. El primero es la l&iacute;nea que origina al panda gigante, el segundo lleva a la aparici&oacute;n del oso de anteojos, y el tercero es una divergencia polit&iacute;pica que deriva en seis especies (negro americano, negro asi&aacute;tico, gris, polar, bezudo y malayo). La historia evolutiva de algunas especies de los osos no est&aacute; conocida y posiblemente cambiar&aacute; conforme nuevas evidencias tanto morfol&oacute;gicas, paleontol&oacute;gicas y moleculares est&eacute;n disponibles. As&iacute; mismo, se aprecia en la literatura una diferencia en los valores de diversidad gen&eacute;tica reportados para poblaciones de diferentes especies en este grupo de carn&iacute;voros dependiendo del grado de fragmentaci&oacute;n de las poblaciones. Sin embargo, la variaci&oacute;n depende tambi&eacute;n de la t&eacute;cnica molecular implementada.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras claves:</b> Diversidad Gen&eacute;tica, Evoluci&oacute;n, Filogenia, Ursidae.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The taxonomic relationships among the eight extant species of the Ursidae family are not well known; however, molecular genetics markers has consistently shown three major clades: the line that leads to the giant panda, the line that leads to the spectacled bear, and a polytomy lineage that results in six other species (American black bear, Asiatic black bear, polar bear, brown bear, sloth bear and sun bear). The phylogenetic relationship of some of the bear species is not well known and it may change with the development of new molecular markers, then, the controversies that surround the family of bears could be resolved. Also, literature shows variation in the genetic diversity values reported for the ursids due to the degree of fragmentation; however, the variation is also related to the molecular technique used.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Key Words:</b> Evolution, Genetic Diversity, Phylogeny, Ursidae.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los miembros de la Familia Ursidae, com&uacute;nmente llamados osos, son de los mam&iacute;feros m&aacute;s estudiados dentro del Orden Carnivora, especialmente en sus h&aacute;bitos alimentarios (Hilderbrand <i>et al.</i> 1996; Noyce y Garshelis 1997), reproducci&oacute;n (Eiler <i>et al.</i> 1989), din&aacute;mica poblacional (Young y Ruff 1982), &aacute;mbito hogare&ntilde;o (Samson y Huot 2001), historias de vida (Freedman <i>et al.</i> 2003) y estimaci&oacute;n poblacional (Boersen <i>et al.</i> 2003). Sin embargo, hist&oacute;ricamente la informaci&oacute;n gen&eacute;tica disponible para este grupo era muy escasa debido a los elevados costos y a la dificultad para desarrollar an&aacute;lisis moleculares. No obstante, en las &uacute;ltimas d&eacute;cadas el uso de t&eacute;cnicas de muestreo no&#45;invasivas y la habilidad de obtener ADN de mejor calidad han tenido un r&aacute;pido desarrollo y los an&aacute;lisis gen&eacute;ticos pueden ser realizados con relativa facilidad y a bajos costos. Esto ha permitido aclarar varias de las inc&oacute;gnitas filogen&eacute;ticas que los datos paleontol&oacute;gicos y morfol&oacute;gicos no han podido resolver; sin embargo, la posici&oacute;n taxon&oacute;mica de algunos miembros de este grupo sigue siendo pol&eacute;mica, como se demuestra en este trabajo.</font></p>  	    <p align="justify"><font face="verdana" size="2">Hemos incluido una revisi&oacute;n de c&oacute;mo el uso de las herramientas moleculares pueden ser &uacute;tiles para detectar las relaciones filogen&eacute;ticas dentro de los miembros de la Familia Ursidae, adem&aacute;s de una secci&oacute;n sobre diversidad gen&eacute;tica de las ocho especies de osos actuales, que ilustra la importancia de estas t&eacute;cnicas en el monitoreo de las diferentes especies y/o poblaciones, especialmente al utilizarlas en el dise&ntilde;o de herramientas de manejo que ayuden a su conservaci&oacute;n. Los objetivos de este art&iacute;culo son: 1) explorar las relaciones taxon&oacute;micas y las diferencias reportadas a partir del uso de diferentes marcadores moleculares, 2) compilar trabajos publicados que han usado t&eacute;cnicas moleculares para entender como la variabilidad gen&eacute;tica puede afectar la sobrevivencia de las poblaciones y las especies de osos y 3) presentar un panorama general acerca de la situaci&oacute;n actual de los diferentes miembros de la Familia Ursidae y su conservaci&oacute;n.</font></p>  	    <p><font face="verdana" size="2"><b>Taxonom&iacute;a</b></font></p>     <p align="justify"><font face="verdana" size="2">Actualmente existen ocho especies vivientes de osos agrupadas en tres subfamilias: Ailuropodinae (panda gigante, <i>Ailuropoda melanoleuca);</i> Tremarctinae (oso de anteojos, <i>Tremarctos ornatus)</i> y Ursinae (oso gris, <i>Ursus arctos;</i> negro americano, <i>Ursus americanus;</i> polar, <i>Ursus maritimus;</i> negro asi&aacute;tico, <i>Ursus thibetanus;</i> bezudo, <i>Melursus ursinus;</i> y malayo, <i>Helarctos malayanus;</i> Wozencraft 1989; Thenius 1990; Yu <i>et al.</i> 2004a, b).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los g&eacute;neros <i>Melursus</i> y <i>Helarctos</i> algunas veces se incluyen dentro del g&eacute;nero <i>Ursus</i> (Hall 1981; Nowak, 1991), mientras que el oso negro asi&aacute;tico, el oso polar y el oso negro americano han sido ubicados dentro de los g&eacute;neros, <i>Selenarctos, Thalarctos</i> y <i>Euarctos,</i> respectivamente (Ewer 1973; Eisenberg 1981; Zhang y Ryder 1994), lo cual refleja la controversia taxon&oacute;mica que existe dentro de este grupo de carn&iacute;voros.</font></p>  	    <p align="justify"><font face="verdana" size="2">El panda gigante es el &uacute;rsido que ha presentado la mayor discusi&oacute;n en su clasificaci&oacute;n. Los cient&iacute;ficos han debatido por m&aacute;s de un siglo su posici&oacute;n filogen&eacute;tica, al no saber si considerlo como un oso o un proci&oacute;nido (Familia Procyonidae, a la que tambi&eacute;n pertenece el mapache, <i>Procyon lotor),</i> e incluso algunos autores lo incluyen junto con el panda menor <i>Ailurus fulgens)</i> en su propia Familia, Ailuropodidae (Wurster&#45;Hill y Bush, 1980; Tagle <i>et al.</i> 1986; Zhang y Shi 1991). Uno de los primeros intentos para determinar la posici&oacute;n taxon&oacute;mica del panda gigante usando t&eacute;cnicas moleculares, se remonta a Leone y Wiens (1956), quienes a partir del an&aacute;lisis de enfoques serol&oacute;gicos, determinaron que esta especie es un pariente cercano de los osos. Igualmente, los an&aacute;lisis citol&oacute;gicos comparativos entre los miembros de la Familia Ursidae, mostraron que el patr&oacute;n de bandeo de los cromosomas del panda gigante, es igual al patr&oacute;n de bandeo de los cromosomas del resto de los &uacute;rsidos, a pesar de que esta especie s&oacute;lo cuenta con 42 cromosomas en comparaci&oacute;n a los 52 cromosomas del oso de anteojos y a los 74 cromosomas de los seis miembros de la subfamilia Ursinae, lo cual se explica por fusi&oacute;n (algunos cromosomas acroc&eacute;ntricos se han pegado con otros; Nash y O'Brien 1987; Nash <i>et al.</i> 1998; Tian <i>et al.</i> 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2">El empleo de algunas t&eacute;cnicas moleculares como es el caso de la hibridaci&oacute;n del ADN, las distancias gen&eacute;ticas de aloenzimas (Sarich 1973; O'Brien <i>et al.</i> 1985), las distancias gen&eacute;ticas usando electroforesis de prote&iacute;nas de dos dimensiones (Goldman <i>et al.</i> 1989; O'Brien 1989) y la secuenciaci&oacute;n de genes mitocondriales (Peng <i>et al.</i> 2007), han prove&iacute;do un fuerte soporte de que el panda gigante comparte el mismo ancestro con todos los osos modernos, por lo tanto, actualmente la inclusi&oacute;n del panda gigante dentro de la familia de los osos es firme.</font>	</p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>An&aacute;lisis filogen&eacute;ticos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El origen de la Familia Ursidae se remonta a inicios del Mioceno en Europa Subtropical, hace aproximadamente 20 millones de a&ntilde;os, a partir de <i>Ursavus elemensis</i> (McLellan y Reiner 1994). Este oso presentaba una talla similar a la de un perro (&lt; 50 kg) y desarroll&oacute; caracter&iacute;sticas de un oso en la constituci&oacute;n de los dientes, y aunque los premolares fueron como el de los c&aacute;nidos, los dientes carnasiales se redujeron y fueron m&aacute;s parecidos al de los osos actuales y los molares evolucionaron en t&eacute;rminos de expansi&oacute;n de la superficie de mordida (Middleton 1997; Hunt 1998).</font></p>  	    <p align="justify"><font face="verdana" size="2">A pesar de numerosos estudios paleontol&oacute;gicos y morfol&oacute;gicos realizados para los miembros de la Familia Ursidae, no existe un consenso sobre la historia evolutiva del grupo al abordar las cuestiones de las relaciones jer&aacute;rquicas dentro de todos los miembros de esta familia.</font></p>  	    <p align="justify"><font face="verdana" size="2">El empleo de los an&aacute;lisis moleculares han demostrado que el panda gigante ha divergido de la l&iacute;nea m&aacute;s antigua (Nash y O'Brien 1987; Talbot y Shields 1996; Waits <i>et al.</i> 1999; Delisle y Strobeck 2002, Yu <i>et al.</i> 2004; Fulton y Strobeck 2006; Ohnishi <i>et al.</i> 2007; Yu <i>et al.</i> 2007; Krause <i>et al.</i> 2008), seguida por el oso de anteojos (Goldman <i>et al.</i> 1989; Waits <i>et al.</i> 1999; Zhang y Ryder 1993,1994; Yu <i>et al.</i> 2004a; Krause <i>et al.</i> 2008). Estos nuevos resultados contrarrestan deducciones anteriores que afirmaban que el panda gigante y el oso de anteojos habr&iacute;an divergido de una misma l&iacute;nea evolutiva (Talbot y Shields 1996).</font></p>  	    <p align="justify"><font face="verdana" size="2">Por su parte, las seis especies de osos agrupadas en la subfamilia Ursinae, divergieron al comienzo del Plioceno en un r&aacute;pido evento de radiaci&oacute;n (Thenius 1990). Para reconstruir las relaciones filogen&eacute;ticas de estas seis especies se han usado m&eacute;todos inmunol&oacute;gicos (Goldman <i>et al.</i> 1989), de hibridaci&oacute;n de ADN, datos de isoenzimas (O'Brien <i>et al.</i> 1985; Wayne et al. 1989), secuenciaci&oacute;n del ADN mitocondrial (Shields y Kocher 1991; Zhang y Ryder 1993, 1994; Talbot y Shields 1996; Krause <i>et al.</i> 2008; Pag&eacute;s <i>et al.</i> 2008), y an&aacute;lisis basados en genes nucleares (Yu <i>et al.</i> 2004a).</font></p>  	    <p align="justify"><font face="verdana" size="2">El an&aacute;lisis de 14 genes nucleares colocan al oso malayo y al oso bezudo como las especies m&aacute;s basales dentro de los ursinos (<a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">Fig. 1A</a>; Pag&eacute;s <i>et al.</i> 2008), pero en general se ha sugerido que el linaje del oso bezudo fue el primero en surgir formando un grupo monofil&eacute;tico (<a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">Figs. 1B</a>&#45;<a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">E</a>; Zhang y Ryder 1993, 1994; Talbot y Shield 1996; Waits <i>et al.</i> 1999; Yu <i>et al.</i> 2004a; Krause <i>et al.</i> 2008). Adem&aacute;s existe una discordancia en las relaciones filogen&eacute;ticas existentes entre el oso negro americano, el oso negro asi&aacute;tico y el oso malayo. Por un lado, resultados del an&aacute;lisis basados en datos de distancias gen&eacute;ticas, usando electroforesis de prote&iacute;nas de dos dimensiones han determinado que el oso malayo y el oso negro asi&aacute;tico son especies hermanas (<a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">Fig. 1C</a>; Goldman y Giri 1989), que en conjunto son especies hermanas del grupo que conforma el oso gris y el oso polar (<a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">Fig. 1C</a>; Zhang y Ryder 1994; Waits <i>et al.</i> 1999). Por otro lado, resultados del an&aacute;lisis de genes mitocondriales y nucleares han sugerido que el oso negro americano y el oso malayo divergieron como taxones hermanos (<a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">Fig. 1B</a>; Zhang y Ryder 1993; 1994). Sin embargo, otros estudios con un n&uacute;mero mayor de marcadores nucleares sugieren que el oso negro americano est&aacute; m&aacute;s relacionado con el oso negro asi&aacute;tico (<a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">Figs. 1D</a> y <a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">E</a>; Talbot y Shields 1996; Yu <i>et al.</i> 2004a; Hou <i>et al.</i> 2007 y Krause <i>et al.</i> 2008).</font></p>  	    <p align="justify"><font face="verdana" size="2">Estudios de ADN mitocondrial colocan al oso gris y al oso polar como grupos hermanos (<a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">Figs. 1A</a>, <a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">B</a>, <a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">C</a>, <a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">D</a> y <a href="/img/revistas/therya/v2n1/a4f1.jpg" target="_blank">E</a>; Talbot y Shields 1996; Pag&eacute;s <i>et al.</i> 2008), lo cual coincide con la evidencia f&oacute;sil (McLellan y Reiner 1994), con la electroforesis de prote&iacute;nas de dos dimensiones (Goldman <i>et al.</i> 1989) y con los an&aacute;lisis de genes mitocondriales y genes nucleares (Zhang y Ryder 1994; Talbot y Shields 1996; Waits <i>et al.</i> 1999; Yu <i>et al.</i> 2004a; Krause <i>et al.</i> 2008).</font></p>  	    <p><font face="verdana" size="2"><b>Diversidad Gen&eacute;tica y conservaci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">La separaci&oacute;n del ancestro de los osos en las ocho especies que existen en la actualidad ocurri&oacute; a lo largo de 20 millones de a&ntilde;os (McLellan y Reiner 1994) debido a factores naturales de fragmentaci&oacute;n y aislamiento. Sin embargo, desde mediados del siglo XX, las actividades antropog&eacute;nicas han acelerado dram&aacute;ticamente el proceso de fragmentaci&oacute;n de algunas poblaciones de osos modernos, haci&eacute;ndolas m&aacute;s vulnerables a factores demogr&aacute;ficos y estoc&aacute;sticos ambientales as&iacute; como factores gen&eacute;ticos, como la deriva g&eacute;nica y la endogamia, incrementando su riesgo de extinci&oacute;n (Taggart&#45;Cowan 1972).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los osos son especialmente vulnerables a cambios en su h&aacute;bitat y de sus fuentes de alimento, por lo tanto son importantes indicadores de la calidad del medio ambiente y la salud del ecosistema en donde viven. Por ejemplo, el oso gris se ha usado para ver la calidad de los ecosistemas de la costa de los Estados Unidos. El oso panda considerado como especie clave para conservar las montanas del bosque templado en el suroeste de China. El oso de anteojos como especie sombrilla para conservar los paramos andinos y el bosque subtropical andino. Sin embargo, para planear programas de conservaci&oacute;n es necesario, entre otras cosas, conocer cu&aacute;l es la situaci&oacute;n actual de las especies respecto a su diversidad gen&eacute;tica.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los primeros intentos para medir la diversidad gen&eacute;tica en las poblaciones de osos fueron realizados con aloenzimas y enzimas de restricci&oacute;n, los cuales expusieron bajos niveles de diversidad en algunas especies como por ejemplo en el panda gigante (Manlove <i>et al.</i> 1980; Wathen <i>et al.</i> 1985; Cronin <i>et al.</i> 1991; Shields y Kocher 1991).</font></p>  	    <p align="justify"><font face="verdana" size="2">Con el dise&ntilde;o y uso de marcadores nucleares m&aacute;s variables, el estudio de las poblaciones de osos ha aumentado considerablemente. Hasta el momento se han dise&ntilde;ados por lo menos 81 marcadores microsat&eacute;lites polim&oacute;rficos espec&iacute;ficos para las diferentes especies de &uacute;rsidos, los cuales han revelado diferentes niveles de variaci&oacute;n gen&eacute;tica de acuerdo a las poblaciones y especies de estudio (Paetkau y Strobeck 1994; Paetkau <i>et al.</i> 1995; Taberlet <i>et al.</i> 1997; Kitahara <i>et al.</i> 2000; Shen <i>et al.</i> 2007; Shih 2009; Sanderlin <i>et al.</i> 2009; Wu <i>et al.</i> 2009). A continuaci&oacute;n presentamos algunos detalles de los estudios de la diversidad gen&eacute;tica por especie de oso.</font></p>  	    <p><font face="verdana" size="2"><b><i>Panda gigante</i></b></font></p>     <p align="justify"><font face="verdana" size="2">El panda gigante es la especie de oso considerada como una de las m&aacute;s vulnerables, se distribuye solamente en tres provincias de la Rep&uacute;blica Popular de China: Sichuan, Shaanxi y Gansu y su h&aacute;bitat se encuentran fragmentado en un promedio de 24 islas continentales (regiones monta&ntilde;osas), adem&aacute;s, algunas de estas subpoblaciones no contienen m&aacute;s de 50 individuos (Loucks <i>et al.</i> 2001). Estas peque&ntilde;as y aisladas poblaciones enfrentan un gran riesgo de depresi&oacute;n endog&aacute;mica, causando una baja diversidad gen&eacute;tica, lo que a su vez disminuye la capacidad de la adaptaci&oacute;n a cambios ambientales y subsecuentemente aumenta el riesgo extinci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">A partir del an&aacute;lisis basado en la electroforesis de prote&iacute;nas, se han medido niveles bajos de variabilidad gen&eacute;tica en el panda gigante (Su <i>et al.</i> 1994), estos niveles son comparables con los reportados para el an&aacute;lisis de secuencias de la regi&oacute;n control del ADN mitocondrial (13 sitios variables fueron hallados en un total de 655 pb secuenciadas; Zhang <i>et al.</i> 1997, 2002), y el an&aacute;lisis en la secuencia del Complejo Mayor de Histocompatibilidad clase II (ya que se encontraron siete alelos para el segmento DRB y seis para el segmento DQA; Wan <i>et al.</i> 2006; Zhu <i>et al.</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">En contraparte, al evaluar otras secuencias de la regi&oacute;n control y con el uso de microsat&eacute;lites, se ha concluido que las poblaciones del panda gigante mantienen de una moderada a una considerable diversidad gen&eacute;tica (p: 22% y H: 35%), en comparaci&oacute;n con otros carn&iacute;voros en peligro de extinci&oacute;n (Lu <i>et al.</i> 2001). Esta mayor viabilidad gen&eacute;tica fue comprobada con resultados del an&aacute;lisis de genes nucleares obtenidos por Zhang <i>et al.</i> (2007a), quienes observaron una alta variabilidad gen&eacute;tica (56%) en las poblaciones de este &uacute;rsido.</font></p>  	    <p align="justify"><font face="verdana" size="2">Basados en estos estudios, la meta para el manejo de estos osos propone en el an&aacute;lisis de viabilidad de las poblaciones, una tasa de dispersi&oacute;n de al menos el 1% para que la diversidad gen&eacute;tica actual se conserve en m&aacute;s del 90% en los pr&oacute;ximos 100 a&ntilde;os (Zhang <i>et al.</i> 2007b).</font></p>  	    <p><font face="verdana" size="2"><b><i>Oso de anteojos</i></b></font></p>     <p align="justify"><font face="verdana" size="2">El oso de anteojos es una especie end&eacute;mica de los Andes, se distribuye desde el occidente de Venezuela hasta Argentina, atravesando Colombia, Ecuador, Per&uacute; y Bolivia. Es el &uacute;nico oso presente en Am&eacute;rica del Sur y a pesar de esto, su baja densidad, sus h&aacute;bitos solitarios y su tendencia por &aacute;reas boscosas han hecho su estudio dificultoso. Hay pocos estudios ecol&oacute;gicos publicados y son con relaci&oacute;n a su alimentaci&oacute;n y su distribuci&oacute;n (Peyton 1980; Yerena 1998; Paisley y Garshelis 2006; R&iacute;os&#45;Uzeda <i>et al.</i> 2006; Rivadeneira&#45;Caned 2008), los estudios gen&eacute;ticos son a&uacute;n m&aacute;s escasos (Varas and Viteri 2002; Ru&iacute;z&#45;Garc&iacute;a 2003; Ru&iacute;z&#45;Garc&iacute;a <i>et al.</i> 2005; Viteri y Waits 2009).</font></p>  	    <p align="justify"><font face="verdana" size="2">A partir del an&aacute;lisis de genes nucleares (microsat&eacute;lites) se ha concluido que el oso de anteojos presenta bajos niveles de diversidad gen&eacute;tica en comparaci&oacute;n a otros carn&iacute;voros neotropicales. El valor de heterocigocidad encontrado en las poblaciones de Colombia, Ecuador, Bolivia y Per&uacute; fue del 40%&#45;43%, en contraparte a la poblaci&oacute;n de Venezuela que presenta un ligero aumento de diversidad (57%). Estos datos se deben principalmente al poco flujo g&eacute;nico que existe como consecuencia de un extremo aislamiento entre poblaciones (Ru&iacute;z&#45;Garc&iacute;a 2003; Ru&iacute;z&#45;Garc&iacute;a <i>et al.</i> 2005). Adem&aacute;s, la cacer&iacute;a furtiva, la conversi&oacute;n de bosques andinos a tierras de agricultura han puesto a este oso en seria amenaza. Informaci&oacute;n sobre variabilidad gen&eacute;tica, as&iacute; como el intercambio gen&eacute;tico entre poblaciones, va a permitir a las entidades a cargo de su manejo el tomar decisiones sobre las &aacute;reas que necesitan protecci&oacute;n y as&iacute; como la creaci&oacute;n de los corredores necesarios, para aseguran la conservaci&oacute;n del oso de anteojos y su h&aacute;bitat.</font></p>  	    ]]></body>
<body><![CDATA[<p><font face="verdana" size="2"><b><i>El oso negro americano</i></b></font></p>     <p align="justify"><font face="verdana" size="2">El oso negro americano es una de la especies de &uacute;rsidos mayormente estudiados a lo largo de su &aacute;rea de distribuci&oacute;n, a excepci&oacute;n de M&eacute;xico en donde su conocimiento es muy limitado. A partir del an&aacute;lisis de <i>fingerprinting,</i> enzimas de restricci&oacute;n y secuencias de genes mitocondriales (regi&oacute;n control y citocromo b) se han identificado dos grupos en el noroeste de Norte Am&eacute;rica. Un primer linaje se distribuye desde el sureste de Alaska hasta el norte de California y el segundo se extiende desde el interior de Alaska hacia el sur en Oreg&oacute;n y Nuevo M&eacute;xico y del este de Terranova a Florida (Cronin <i>et al.</i> 1991; Paetkau y Strobeck, 1996; Byun <i>et al.</i> 1997; Wooding y Ward 1997; Stone y Cook 2000).</font></p>  	    <p align="justify"><font face="verdana" size="2">Estimaciones de la variabilidad gen&eacute;tica usando prote&iacute;nas, muestran variaciones en su heterocigocidad, por ejemplo se encontr&oacute; un bajo nivel en Alaska (0%), California (3%), Maine (0%), Montana (1.3%), Tennessee (1.5%) y un mayor nivel de heterocigocidad entre la frontera de Tennessee y Carolina del Norte (8%) en Estados Unidos (Manlove <i>et al.</i> 1980; Wathen <i>et al.</i> 1985). El an&aacute;lisis de microsat&eacute;lites ha reflejado igualmente una variaci&oacute;n en el nivel de variabilidad gen&eacute;tica, de baja a moderada en el noroeste de Florida (27%; Dixon <i>et al.</i> 2007), Terranova, Canad&aacute; (36%; Paetkau y Strobeck 1994), Isla de Kodiak, Alaska (36%; Paetkau y Strobeck 1997), Mobile River Basin, Alabama (31.6%; Edwards, 2002), en el l&iacute;mite entre Alabama y Mississippi (38%&#45;42%; Warrillow <i>et al.</i> 2001); una mediana variabilidad en la costa central y sur de California (41%&#45;48%; Brown <i>et al.</i> 2009), este de Utah (52.9%; Sinclair <i>et al.</i> 2003), Georgia (50%; Sanderlin <i>et al.</i> 2009), noreste y parte de la costa de Louisiana (42% &#45; 54%; Csiki <i>et al.</i> 2003; Triant <i>et al.</i> 2004) y noreste de Minnesota (54 %; Warrillow <i>et al.</i> 2001) en los Estados Unidos. Se ha detectado una alta diversidad gen&eacute;tica (80%) en las poblaciones de oso negro americano distribuidas al sur de Quebec, suroeste de Alberta (Paetkau y Strobeck, 1994) y costa media y sureste de la Columbia Brit&aacute;nica en Canad&aacute; (62%&#45;81%; Woods <i>et al.</i> 1999; Marshall y Ritland 2002), as&iacute; como en el oeste de Arkansas (72.8%; Csiki <i>et al.</i> 2003), norte de Wisconsin (&gt; 0.77%; Belant <i>et al.</i> 2005), norte de Idaho (79%; Cushman <i>et al.</i> 2006), norte de Florida (71%; Dixon <i>et al.</i> 2007) y costa norte de California (63%; Brown <i>et al.</i> 2009), Estados Unidos, al igual que entre el l&iacute;mite de Coahuila, M&eacute;xico y oeste de Texas, Estados Unidos (71.7%; Onorato <i>et al.</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">Esta diversidad se debe en gran medida a las diferencias en la estructura gen&eacute;tica espacial de las poblaciones, el desarrollo residencial, el n&uacute;mero de carreteras, elevaci&oacute;n y cobertura de los bosques cuando los osos se mueven en primavera (movimiento de apareamiento), el nivel de movimiento de genes, etc (Cushman y Lewis 2010). En general el oso negro ha demostrado una gran capacidad de dispersi&oacute;n, se pueden mover amplias distancias evitando de esta manera la endogamia (Maehr <i>et al.</i> 1998; Lee y Vaughan, 2003, Costello <i>et al.</i> 2008), permitiendo que exista un flujo g&eacute;nico entre poblaciones, a&uacute;n en presencia de barreras geogr&aacute;ficas (Cushman <i>et al.</i> 2006; Schwartz <i>et al.</i> 2006; Varas <i>et al.</i> 2007), e inclusive se ha registrado la recolonizaci&oacute;n de &aacute;reas en donde esta especie hab&iacute;a sido extirpada a mediados del siglo pasado, formando una metapoblaci&oacute;n (Onorato <i>et al.</i> 2004, 2007).</font></p>  	    <p><font face="verdana" size="2"><b><i>Oso gris</i></b></font></p>     <p align="justify"><font face="verdana" size="2">El oso gris es el &uacute;rsido m&aacute;s ampliamente distribuido, sin embargo, en los &uacute;ltimos a&ntilde;os ha declinado su intervalo de distribuci&oacute;n que abarcaba Am&eacute;rica del Norte desde Canad&aacute; hasta el norte de M&eacute;xico; Europa hasta Asia y norte de &Aacute;frica (Servheen <i>et al.</i> 1999).</font></p>  	    <p align="justify"><font face="verdana" size="2">El an&aacute;lisis del ADN mitocondrial ha documentado que debido a los cambios clim&aacute;ticos suscitados durante el Pleistoceno. Las poblaciones de oso gris se aislaron, estructurando sus poblaciones y formando seis l&iacute;neas evolutivas independientes. El grupo I comprende las poblaciones que viven exclusivamente en tres Islas costeras de Alaska (Admiralty, Baranof y Chichagof); el grupo II incluye a aquellas poblaciones que viven en Europa oriental y en el Estrecho de Bering; el grupo III comprende a los osos que viven en el este de Alaska y el norte de Canad&aacute;; el grupo IV incluye a los osos que viven en el sur de Canad&aacute; y cinco poblaciones de Estados Unidos, en donde actualmente quedan como poblaciones relictas; el grupo V comprende las poblaciones asentadas en Europa occidental; y por &uacute;ltimo en el grupo VI se incluye a las poblaciones extintas de oso gris que habitaban en el norte de &Aacute;frica en las Monta&ntilde;as Atlas (Taberlet y Bouvet 1994; Talbot y Shields 1996; Taberlet <i>et al.</i> 1997; Waits <i>et al.</i> 1998; P&aacute;&aacute;bo 2000; Emerson y Hewitt 2005; Calvignac <i>et al.</i> 2008). En Am&eacute;rica del Norte se ha detectado un alto porcentaje de secuencia divergente entre haplotipos (4.3%) para el oso gris (Waits <i>et al.</i> 1998).</font></p>  	    <p align="justify"><font face="verdana" size="2">En Europa occidental, estudios usando secuencias del ADN mitocondrial han mostrado que las poblaciones relictas de oso gris son monom&oacute;rficas y est&aacute;n estructuradas filogeogr&aacute;ficamente (Randi <i>et al.</i> 1994; Taberlet y Bouvet 1994). Se ha documentado que las poblaciones de oso gris de Abruzzo, Trentino (Centro y Norte de Italia respectivamente) y Croacia son monom&oacute;rficos dentro de las poblaciones y comparten el mismo haplotipo de citocromo b (Gentile 1994). Lo que refleja una baja diversidad gen&eacute;tica en comparaci&oacute;n al n&uacute;mero promedio de alelos por locus (6.6) encontrado en la poblaci&oacute;n de la Bah&iacute;a de Prudhoe en Alaska (Cronin <i>et al.</i> 1999). Por otro lado, la regi&oacute;n control es m&aacute;s variable, ya que la poblaci&oacute;n de Abruzzo tiene su propio haplotipo y los osos de Croacia son polim&oacute;rficos con dos haplotipos (Gentile 1994).</font></p>  	    <p align="justify"><font face="verdana" size="2">Informaci&oacute;n obtenida del an&aacute;lisis de microsat&eacute;lites, revela que la diversidad gen&eacute;tica de las poblaciones Ib&eacute;ricas presenta bajos niveles de heterocigocidad (32%; Garc&iacute;a&#45;Garitagoitia 2003), esto debido a que dichas poblaciones se encuentran sumamente fragmentadas y aisladas. En contraste, ha sido reportado que la poblaci&oacute;n de oso gris de Escandinavia, conserva niveles altos de diversidad gen&eacute;tica (66.5%). Valores que son sorprendentes debido a que existi&oacute; un intento de exterminio que redujo el tama&ntilde;o de la poblaci&oacute;n a un promedio de 35 osos por subpoblaci&oacute;n hace siete generaciones (Waits <i>et</i> <i>al.</i> 2000).</font></p>  	    <p align="justify"><font face="verdana" size="2">Las poblaciones Asi&aacute;ticas de oso gris reflejan una baja diversidad gen&eacute;tica nuclear en comparaci&oacute;n a las poblaciones de algunas regiones de Canad&aacute; y Estados Unidos. Por ejemplo, la heterocigocidad presente en determinadas poblaciones de Jap&oacute;n vari&oacute; de 24% a 30% (Tsuruga <i>et al.</i> 1994) y en Pakist&aacute;n fue del 55.7% (Bellemain <i>et al.</i> 2007). En contraparte, la poblaci&oacute;n de Pakist&aacute;n, presenta valores similares e inclusive mayores a los niveles de heterocigocidad reportados para otras poblaciones de Estados Unidos (Paetkau <i>et al.</i> 1998) y Europa (Taberlet <i>et al.</i> 1997; Garc&iacute;a&#45;Garitagoitia, 2003).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Con respecto a Am&eacute;rica del Norte, se han detectado valores altos de diversidad gen&eacute;tica en la regi&oacute;n Circumpolar de Alaska y Canad&aacute; (61%&#45;77%; Craighead <i>et al.</i> 1995; Paetkau <i>et al.</i> 1998; Cronin <i>et al.</i> 1999, 2005), as&iacute; como en el sur de Alaska (70%) y suroeste de Canad&aacute; (78.8%). Por otro lado, se reportan los valores m&aacute;s bajos de diversidad en la poblaci&oacute;n de Yellowstone (55%) y en el Archipi&eacute;lago de Kodiak (26%&#45;29%; Paetkau <i>et al.</i> 1998).</font></p>  	    <p><font face="verdana" size="2"><b><i>Oso polar</i></b></font></p>     <p align="justify"><font face="verdana" size="2">El oso polar presenta una distribuci&oacute;n circumpolar y se mueve en los mares congelados del hemisferio norte. Los estudios gen&eacute;ticos han mostrado que este oso presenta altos niveles de flujo g&eacute;nico a lo largo de miles de kil&oacute;metros, por lo que no existe una significativa estructura gen&eacute;tica (Paetkau <i>et al.</i> 1995, 1999; Cronin <i>et al.</i> 2006; Crompton <i>et al.</i> 2008). Al igual que las otras especies de &uacute;rsidos, el oso polar presenta valores de variaci&oacute;n prote&iacute;nica pr&aacute;cticamente indetectables (Allendorf <i>et al.</i> 1979; Manlove <i>et al.</i> 1980; Larsen <i>et al.</i> 1983), pero una mayor variaci&oacute;n en el ADN mitocondrial (Cronin <i>et al.</i> 1991).</font></p>     <p align="justify"><font face="verdana" size="2">En particular en el &Aacute;rtico Canadiense, el an&aacute;lisis de microsat&eacute;lites, ha arrojado una moderada diversidad gen&eacute;tica en las poblaciones del oso polar (60%&#45;66.5%; Paetkau <i>et</i> <i>al.</i> 1995; Crompton <i>et al.</i> 2008).</font></p>  	    <p><font face="verdana" size="2"><b><i>Oso negro asi&aacute;tico</i></b></font></p>     <p align="justify"><font face="verdana" size="2">La informaci&oacute;n gen&eacute;tica sobre el oso negro asi&aacute;tico es muy limitada. Este carn&iacute;voro habita en &aacute;reas fragmentadas y aisladas que van desde el sureste de Ir&aacute;n hasta Jap&oacute;n (Japan Bear Network 2006). El estudio gen&eacute;tico de microsat&eacute;lites de ADN, revel&oacute; que existe una mayor diversidad gen&eacute;tica en las poblaciones del este de Jap&oacute;n (44.5 %) en comparaci&oacute;n a las poblaciones presentes en el oeste (27 %; Shaitoh <i>et al.</i> 2001). As&iacute; mismo, se ha reportado una diversidad gen&eacute;tica en la isla principal del archipi&eacute;lago japon&eacute;s de Honshu del 43% al 64% (Ohnishi <i>et al.</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">En este sentido, a partir de la secuenciaci&oacute;n de la regi&oacute;n control del ADN mitocondrial, se ha podido determinar que las poblaciones del oso negro asi&aacute;tico del oeste de Jap&oacute;n presentan una menor diversidad haplot&iacute;pica en comparaci&oacute;n a las poblaciones del este, confirm&aacute;ndose la existencia de dos l&iacute;neas evolutivas independientes (Ishibashi y Saitoh 2004; Yasukochi <i>et al.</i> 2008). Adem&aacute;s, a partir de los resultados obtenidos del an&aacute;lisis de la secuenciaci&oacute;n del ADN mitocondrial de tres subespecies de oso negro asi&aacute;tico <i>(ussuricus, formosanus y mupinensis),</i> se demostr&oacute; que la regi&oacute;n <i>D1</i> de la regi&oacute;n control es lo suficientemente informativa como para detectar individuos dentro de las tres subespecies, por lo que esta regi&oacute;n podr&iacute;a ser usada en otras poblaciones donde hay dudas sobre la identidad de los osos migrantes (Hwang <i>et al.</i> 2008). Con respecto a los dem&aacute;s pa&iacute;ses en donde se distribuye esta especie no se cuenta con informaci&oacute;n gen&eacute;tica.</font></p>  	    <p><font face="verdana" size="2"><b><i>Oso bezudo y oso malayo</i></b></font></p>     <p align="justify"><font face="verdana" size="2">Actualmente no existe informaci&oacute;n que nos permita conocer la situaci&oacute;n actual referente a la diversidad gen&eacute;tica de los osos malayo y bezudo. El conocer en gran medida la diversidad gen&eacute;tica y estructura gen&eacute;tica de las poblaciones de estos osos, permitir&aacute; tomar decisiones correctas en la translocaci&oacute;n de individuos de una poblaci&oacute;n a otra (Taberlet y Bouvet 1994; Miller <i>et al.</i> 1998; Triant <i>et al.</i> 2004), as&iacute; como el dise&ntilde;o de corredores biol&oacute;gicos para el flujo g&eacute;nico efectivo entre poblaciones contiguas (Dixon <i>et al.</i> 2007), para la conservaci&oacute;n a largo plazo de estos carn&iacute;voros.</font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Dependiendo de la naturaleza de las t&eacute;cnicas moleculares empleadas en la jerarquizaci&oacute;n de los miembros de la familia de los osos, son los resultados obtenidos, presentando en ocasiones contradicciones en su taxonom&iacute;a.</font></p>  	    <p align="justify"><font face="verdana" size="2">Todos los estudios consultados en este trabajo que se han basado en t&eacute;cnicas moleculares, soportan tres grupos. El linaje m&aacute;s antiguo es el del panda gigante, seguido por el grupo que origin&oacute; al oso de anteojos, y por &uacute;ltimo aparece una divergencia polit&iacute;pica que culmin&oacute; con la aparici&oacute;n de los miembros de la subfamilia Ursinae. Igualmente se confirma que los osos polar y gris son grupos hermanos. Sin embargo, en donde no existe un consenso real en la taxonom&iacute;a de sus especies, es dentro de la subfamilia Ursinae, ya que como se evidenci&oacute; anteriormente, la posici&oacute;n de algunos de sus grupos internos cambia dependiendo del poder de resoluci&oacute;n del an&aacute;lisis gen&eacute;tico empleado.</font></p>  	    <p align="justify"><font face="verdana" size="2">En cuanto a los estudios sobre variabilidad gen&eacute;tica, los primeros intentos por medir la diversidad gen&eacute;tica en las poblaciones de osos se hicieron con aloenzimas y enzimas de restricci&oacute;n, reflejando en general bajos niveles de variaci&oacute;n gen&eacute;tica en todas las poblaciones de osos evaluadas. Sin embargo, recientemente, con el dise&ntilde;o de nuevos marcadores nucleares altamente variables (microsat&eacute;lites) que se han aplicado a los estudios de diversidad gen&eacute;tica en estos carn&iacute;voros, se ha puesto en manifiesto una considerable variaci&oacute;n gen&eacute;tica. En estudios recientes usando an&aacute;lisis de "gen&eacute;tica del paisaje" y regresiones log&iacute;sticas condicionales, se demostr&oacute; consistentemente que los factores del paisaje influencian directamente en las decisiones de cuando y donde mover a algunos individuos, y esto a su vez afecta directamente el grado de variabilidad gen&eacute;tica.</font></p>  	    <p align="justify"><font face="verdana" size="2">A partir del uso de estos marcadores moleculares, tenemos que el panda gigante presenta una considerable diversidad gen&eacute;tica, por lo que a esta especie de oso podr&iacute;a no consider&aacute;rsele como una especie sin salida evolutiva. Adem&aacute;s, una gran cantidad de datos de secuencias mitocondriales est&aacute;n ahora disponibles para varias especies de osos, principalmente para algunas poblaciones de Am&eacute;rica del Norte, mientras que existe una evidente falta de datos para los osos de Am&eacute;rica del Sur y para otros continentes. Un obst&aacute;culo importante para la obtenci&oacute;n de estos datos es el alto costo y el esfuerzo de la recogida de muestras del ADN. Este obst&aacute;culo es parcialmente reducido con el avance de la tecnolog&iacute;a molecular, por ejemplo, ahora que se han desarrollado t&eacute;cnicas para aislar el ADN de muestras de pelo y/o heces recolectadas en el campo, se puede evaluar en un futuro a corto plazo la diversidad gen&eacute;tica de las poblaciones de estos &uacute;rsidos.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los osos son animales carism&aacute;ticos que en muchos lugares se han convertido en la bandera de conservaci&oacute;n, por ejemplo el oso de anteojos, como bandera de conservaci&oacute;n de paramos y bosques andinos. El oso polar, para educar al p&uacute;blico sobre el cambio clim&aacute;tico y el derretimiento del hielo polar. El panda gigante, para la conservaci&oacute;n de los bosques de bamb&uacute;. El oso negro asi&aacute;tico, como bandera de conservaci&oacute;n de las &aacute;reas monta&ntilde;osas de China, etc. Debido a que los osos tienen grandes requerimientos ecol&oacute;gicos tanto en su &aacute;rea de vida como a las diferentes funciones que desempe&ntilde;an, se han convertido en especies claves para promover la conservaci&oacute;n de una gran variedad de ecosistemas y de sus recursos naturales asociados.</font></p>  	    <p align="justify"><font face="verdana" size="2">Por un lado, el carisma de los osos y su conexi&oacute;n cultural con las diversas comunidades donde habitan, han convertido a los osos en especies &uacute;nicas para iniciar procesos de di&aacute;logo entre las comunidades y las entidades encargadas del manejo de las &aacute;reas. Por otro lado, los investigadores estamos haciendo nuestra parte presentando la informaci&oacute;n cient&iacute;fica necesaria en cuanto a los factores ecol&oacute;gicos y gen&eacute;ticos, para entender la situaci&oacute;n actual que presentan las diferentes poblaciones. De esta manera ser&aacute; posible el poner en marcha programas de conservaci&oacute;n basados en informaci&oacute;n cient&iacute;fica, que permitan la sobrevivencia a largo plazo de estos majestuosos mam&iacute;feros.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2"><b>Allendorf, F. W., F. B. Christiansen, T. Dobdon, W. F. Eeanes, y O. Frydenberg.</b> 1979. Electrophoretic variation in large Mammals. 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