<?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>S2007-33642020000300484</article-id>
<article-id pub-id-type="doi">10.12933/therya-20-1071</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Woody plant encroachment drives habitat loss for a relict population of a large mammalian herbivore in South America]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cuéllar-Soto]]></surname>
<given-names><![CDATA[Erika]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Johnson]]></surname>
<given-names><![CDATA[Paul J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Macdonald]]></surname>
<given-names><![CDATA[David W.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrett]]></surname>
<given-names><![CDATA[Glyn A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Segundo]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Sultan Qaboos University Department of Biology ]]></institution>
<addr-line><![CDATA[Muscat ]]></addr-line>
<country>Oman</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Oxford Department of Zoology Wildlife Conservation Research Unit]]></institution>
<addr-line><![CDATA[Oxon ]]></addr-line>
<country>United Kingdom</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Reading School of Biological Sciences ]]></institution>
<addr-line><![CDATA[Reading ]]></addr-line>
<country>United Kingdom</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Comunidad Rancho Viejo  ]]></institution>
<addr-line><![CDATA[Santa Cruz ]]></addr-line>
<country>Bolivia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>11</volume>
<numero>3</numero>
<fpage>484</fpage>
<lpage>494</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-33642020000300484&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-33642020000300484&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-33642020000300484&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Woody plant encroachment (WPE) is reshaping the physiognomy of grasslands and savannahs worldwide. At the same time, this habitat conversion is accelerating the loss of associated biodiversity. In general, studies on WPE have focused on abiotic factors, singly or in combination, that trigger this phenomenon. Despite its ecological relevance, very few studies have tackled the effects of WPE-spurred habitat transformation on animal species dependent on relatively open areas such as grasslands and savannas for survival. We studied a relict and almost extinct population of large, herbivorous guanacos (Lama guanicoe) in the Gran Chaco region, Santa Cruz department, Bolivia. We tested whether guanacos were using habitats (at particular and distinct stages of WPE) in relation to their availability. Although this species is considered a generalist herbivore. We tested variation in habitat use focusing on two spatial scales. First, at the landscape level, we performed aerial surveys. Second, at the fine scale, we tracked six groups of guanacos for twenty months and documented the various habitats used within their approximate home ranges. At both scales, we performed a Manly-Chesson&#8217;s index referring to the standardised proportional use of each habitat divided by the proportional availability of each, with the values for all habitats summing to 1. An index value &lt; 1 or &gt; 1 suggests, respectively, that a habitat is avoided or selected. We found a disproportionate use of open vegetation (scrubland and grassland) by guanacos in relation to habitat availability at both scales. In addition, the current distribution range of the species is restricted to less than 800 km2 of the approximately 3,000 km² potentially available in 1998. We confirmed a contraction between 1996 and 2006 in the distribution of the local Chacoan guanaco population from the area where guanacos were first monitored towards the Kaa-Iya National Park border. Our results showed that guanacos are restricted to relatively open areas. Furthermore, the observed reduction in the area previously occupied by the species could be the beginning of a distributional shift and potential loss of the guanaco&#8217;s geographic range due to habitat replacement. The latter was also reflected in a previous dietary study of this population we found that guanacos largely consumed the native grass A. mendocina (Poaceae), which has shrunk in distribution by 90 % in this region over a 40 year period and is gradually being replaced by an invasive forb, Lippia sp. Therefore, if the overall purpose on evaluating habitat use is to understand the basic requirements to sustain this population of guanacos, we need to highlight the poor quality and acute regression of the current preferred habitat. In this case, habitat structure can have a profound effect on the success of the guanaco population recovery and its long-term establishment. Therefore, we urge researchers and decision makers to look beyond the more direct human-induced pressures on the species, such as hunting, competition with domestic livestock and agricultural development and consider the importance of WPE as a direct driver for habitat loss.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El incremento de la vegetación arbustiva está reformando la fisonomía de los pastizales y sabanas a lo largo del mundo y acelerando la pérdida de la biodiversidad. En general, los estudios sobre arbustización se han focalizado en factores abióticos, actuando tanto en forma individual como combinados, que han disparado el fenómeno. A pesar de su relevancia ecológica, muy pocos estudios han enfrentado los efectos derivados de la transformación del hábitat vía arbustización, sobre especies dependientes, para su supervivencia, de áreas relativamente abiertas, tales como pastizales o sabanas. Nosotros estudiamos una población relictual y casi extinta de un gran herbívoro, el guanaco Lama guanicoe en la región del Gran Chaco en Bolivia. Allí pusimos a prueba la hipótesis de que los guanacos están usando hábitats (en diferentes estados de arbustización) con relación a su disponibilidad. Además evaluamos la prueba la variación en el uso del hábitat enfocado a dos escalas espaciales. Primero, a nivel de paisaje, a partir de reconocimientos aéreos. Segundo, a una escala fina, seguimos en el campo 6 grupos de guanacos durante 20 meses y registramos su uso de hábitat dentro de sus ámbitos de hogar aproximados. Para ambas escalas, aplicamos el índice de Manly-Chesson. Un valor del índice &lt; 1 o &gt;1 sugiere que el hábitat es evitado o seleccionado, respectivamente. Encontramos que los guanacos usan la vegetación abierta (matorral y pastizal) en forma desproporcionada en relación con la disponibilidad de los hábitats para ambas escalas de abordaje. Además, que la actual distribución geográfica de la especie está restringida a menos de 800 km2 de los ca. 3,000 km² potencialmente disponibles en 1998. Confirmamos una retracción, entre 1996 y 2006 en la distribución del guanaco chaqueño a partir del área donde fue monitoreado por primera vez hacia el límite del Parque Nacional Kaa-Iya. Nuestros resultados mostraron que los guanacos están restringidos a las áreas relativamente más abiertas. Además, que la reducción observada en el área previamente ocupada por la especie podría constituir el comienzo de un cambio distribucional y una potencial pérdida de rango geográfico para el guanaco, debido al reemplazo de hábitat. Esto último sumado a que la gramínea nativa Aristida mendocina (Poaceae), especie preferida en la dieta del guanaco chaqueño, está siendo gradualmente reemplazada por una leñosa invasora, Lippia sp. Por lo tanto, si el propósito global de la evaluación del uso de hábitat es comprender los requerimientos básicos para sostener esta población de guanacos, necesitamos destacar la pobre calidad y aguda regresión de su hábitat preferido contemporáneo. En este caso, la estructura del hábitat puede tener un profundo efecto sobre el éxito de la recuperación de la población de guanaco y su sostenibilidad a largo plazo. Por lo tanto, urgimos a los investigadores y gestores a considerar la importancia de la arbustización como un factor directo conducente a la pérdida de hábitat y una amenaza inminente a la biodiversidad regional.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Bolivia]]></kwd>
<kwd lng="en"><![CDATA[Gran Chaco]]></kwd>
<kwd lng="en"><![CDATA[Lama guanicoe]]></kwd>
<kwd lng="en"><![CDATA[Pampas]]></kwd>
<kwd lng="en"><![CDATA[tropical dry forest]]></kwd>
<kwd lng="en"><![CDATA[&#8220;thicketisation&#8221; of savannahs]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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