<?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>1659-4266</journal-id>
<journal-title><![CDATA[Cuadernos de Investigación UNED]]></journal-title>
<abbrev-journal-title><![CDATA[Cuadernos de Investigación UNED]]></abbrev-journal-title>
<issn>1659-4266</issn>
<publisher>
<publisher-name><![CDATA[Universidad Estatal a Distancia de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-42662017000100091</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Biología alimentaria de Syrigma sibilatrix (Aves: Ardeidae) en un humedal del Río Paraná Medio, Argentina]]></article-title>
<article-title xml:lang="en"><![CDATA[Feeding Biology of Syrigma sibilatrix (Birds: Ardeidae) in a wetland of the Middle Parana River, Argentina]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olguín]]></surname>
<given-names><![CDATA[Pamela Fernanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Simonetti]]></surname>
<given-names><![CDATA[Pía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leon]]></surname>
<given-names><![CDATA[Evelina Jésica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beltzer]]></surname>
<given-names><![CDATA[Adolfo Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ezequiel]]></surname>
<given-names><![CDATA[Lorenzón, Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Limnología  ]]></institution>
<addr-line><![CDATA[Santa Fe ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Argentino de Oceanografía  ]]></institution>
<addr-line><![CDATA[Bahía Blanca ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<volume>9</volume>
<numero>1</numero>
<fpage>91</fpage>
<lpage>96</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-42662017000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-42662017000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-42662017000100091&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se estudió la dieta de Syrigma sibilatrix (n=19) en la isla Carabajal (31°39&#8217; S y 60°42&#8217; O) desde 1999 hasta 2003. El espectro trófico resultó integrado por 14 entidades taxonómicas de la fracción animal. El índice de diversidad trófica de Brillouin varió entre 0,23 - 2,15. Los valores del índice de importancia relativa fueron: insectos = 10 780, arácnidos y crustáceos= 1 800 y vertebrados= 1 750. La mayoría de las presas estuvieron representadas por organismos comprendidos en los intervalos 0-20 mm (45%) y 21-40 mm (35%). Los valores de la amplitud del nicho trófico por estación fueron de 1,98 en primavera, 2,34 en verano, 2,21 en otoño y 1,99 en invierno mientras que los valores estandarizados fueron de 0,075 en primavera, 0,10 en verano, 0,09 en otoño y de 0,076 en invierno. La eficiencia alimentaria fue de 96,01% en primavera, 98,3% en verano, 89,9% en otoño y 92,34% en invierno. No se encontró evidencia de selectividad dietaria. El mayor porcentaje de uso de hábitat (69%) correspondió a la unidad ambiental de pastizal. En conclusión, los resultados indicaron que en la planicie de inundación del río Paraná medio, S. sibilatrix tiene una dieta basada principalmente en insectos que obtiene principalmente en la unidad ambiental de pastizal.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The whistling heron (Syrigma sibilatrix) is a neotropical species that inhabits aquatic environments, rural areas and groves. We studied the diet of 19 birds in Carabajal Island (31°39´S, 60°42´W) from 1999 to 2003. The trophic spectrum was composed of 14 taxonomic units of animal taxa. Trophic diversity ranged between 0.23 and 2.15. Index of relative importance was of 10 780 for insects, 1 800 for arachnids and crustaceans, and 1 750 for vertebrates. Most of the prey were represented by individuals included in the 0-20 mm (45%) and 21-40 mm (35%) size intervals. Trophic niche breadth was of 1.98 in spring, 2.34 in summer, 2.21 in autumn, and 1.99 in winter; standardized values were of 0.075 in spring, 0.10 in summer, 0.09 in autumn, and 0.076 in winter. Feeding efficiency was 96.01% in spring, 98.3% in summer, 89.9% in autumn and 92.34% in winter. No evidence was found of food selectivity. The highest percentage of site fidelity (69%) corresponded to the grassland environment. In the floodplain of the Middle Parana River, S. sibilatrix primarily feeds on insects from grasslands.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ecología trófica]]></kwd>
<kwd lng="es"><![CDATA[Aves acuáticas]]></kwd>
<kwd lng="es"><![CDATA[Valle de Inundación]]></kwd>
<kwd lng="en"><![CDATA[Feeding ecology]]></kwd>
<kwd lng="en"><![CDATA[waterbirds]]></kwd>
<kwd lng="en"><![CDATA[floodplain]]></kwd>
</kwd-group>
</article-meta>
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