<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442017000401540</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v65i4.26266</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Variation in hierarchical guild structure between two bird assemblages of a wetland in the Mexican Pacific]]></article-title>
<article-title xml:lang="es"><![CDATA[Variación en la estructura jerárquica de gremios entre dos ensambles de aves en un humedal del Pacífico de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[RuizBruceTaylor]]></surname>
<given-names><![CDATA[Mateo D.M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[RangelSalazar]]></surname>
<given-names><![CDATA[JoséLuis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Enríquez]]></surname>
<given-names><![CDATA[PaulaL.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Cortés]]></surname>
<given-names><![CDATA[JorgeL.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Estrada]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,El Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,El Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,El Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,El Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad del Mar  ]]></institution>
<addr-line><![CDATA[ Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>65</volume>
<numero>4</numero>
<fpage>1540</fpage>
<lpage>1553</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442017000401540&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442017000401540&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442017000401540&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Neotropical wetlands comprise contrasting habitats with highly diverse avifauna, including herbivores, insectivores and carnivores, of both terrestrial and aquatic species. Therefore, comparisons between wetland bird assemblages based only on species identity may disregard turnover within ecological groups, and eclipse important variations between habitat types. We studied bird assemblages from mangrove and estuary habitat types from a coastal lagoon system in Oaxaca, Mexico. For this, we used 640 point counts to obtain data on bird species using those habitats between October 2009 and May 2012. We ascertained guild structure by classifying 139 species in a scalar hierarchy of two-levels: 17 key-resource guilds nested within seven trophic guilds. To evaluate variation in guild structure between habitat types, we contrasted richness and diversity across trophic guilds and tested for variation in abundance within key-resource guilds. We exposed a tendency of greater diversity within terrestrial guilds in mangrove and within aquatic guilds at the estuary. However, these differences were compensatory and neither richness nor diversity varied between habitat types in comparisons across the sets of trophic guilds. Parallel analyses at two hierarchical levels supported the theoretical prediction of greater change at lower levels. Herpetofauna, wood invertebrates, aquatic invertebrates and seeds emerged as dietary components that may explain the distribution of abundance in key-resource guilds. Although the guilds from mangrove and estuary produced comparable sets of richness and diversity values, the actual identity of guilds with high values varied between habitats. On the other hand, species abundance comparisons within guilds pinpointed specific associations with habitat types and this method represents a suitable strategy for identifying habitat preferences in complex wetland bird assemblages.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los humedales neotropicales comprenden hábitats contrastantes con avifaunas altamente diversas que incluyen especies terrestres y acuáticas de herbívoros, insectívoros y carnívoros. Por lo cual, las comparaciones entre los ensambles avifaunísticos de los humedales basados únicamente en la identidad de especies podrían ignorar el recambio entre grupos ecológicos, y ocultar variaciones importantes entre tipos de hábitat. Nosotros estudiamos ensambles avifaunísticos de tipos de hábitat de manglar y estuario en un sistema lagunar de la costa de Oaxaca, México. Entre octubre 2009 y mayo 2012, utilizamos 640 puntos de conteo para determinar la estructura de gremios mediante la clasificación de 139 especies en una jerarquía escalar de dos niveles: 17 gremios de recursos claves anidados en siete gremios tróficos. Para evaluar la variación en la estructura jerárquica entre tipos de hábitat, contrastamos la riqueza y diversidad a través de gremios tróficos y probamos para variación en la abundancia dentro de gremios de recursos claves. Registramos una tendencia de mayor diversidad en gremios terrestres del manglar y en gremios acuáticos del estuario. Sin embargo, ésta variación fue compensatoria, ya que ni la riqueza específica ni la diversidad variaron entre los tipos de hábitat a través de los conjuntos de gremios tróficos. Un análisis paralelo de dos niveles jerárquicos soportó la predicción de un mayor recambio en niveles inferiores. La herpetofauna, los invertebrados en madera, los invertebrados acuáticos, y las semillas se presentaron como componentes alimenticios que podrían explicar la distribución de abundancia en los gremios de recursos claves. Aunque los gremios del manglar y estuario produjeron conjuntos comparables de valores de riqueza y diversidad, la identidad exacta de los gremios con valores altos variaba entre hábitats. Por otro lado, las comparaciones de abundancia dentro los gremios determinaron asociaciones específicas con tipos de hábitat y este método representa una estrategia apta para identificar las preferencias de hábitat en ensambles complejos de aves en humedales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[aves]]></kwd>
<kwd lng="en"><![CDATA[key-resource guild]]></kwd>
<kwd lng="en"><![CDATA[trophic guild]]></kwd>
<kwd lng="en"><![CDATA[hierarchy theory]]></kwd>
<kwd lng="en"><![CDATA[mangrove]]></kwd>
<kwd lng="en"><![CDATA[estuary]]></kwd>
<kwd lng="en"><![CDATA[Oaxaca]]></kwd>
<kwd lng="es"><![CDATA[aves]]></kwd>
<kwd lng="es"><![CDATA[gremio de recursos claves]]></kwd>
<kwd lng="es"><![CDATA[gremio trófico]]></kwd>
<kwd lng="es"><![CDATA[teoría de jerarquías]]></kwd>
<kwd lng="es"><![CDATA[manglar]]></kwd>
<kwd lng="es"><![CDATA[estuario]]></kwd>
<kwd lng="es"><![CDATA[Oaxaca]]></kwd>
</kwd-group>
</article-meta>
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