<?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>S0034-77442017000301174</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v65i3.23865</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variaciones espaciales y ontogenéticas en la dieta de un plecóptero de amplia distribución Claudioperla tigrina (Plecoptera: Gripopterygidae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Spatial and ontogenetic variations in the diet of a widely distributed stonefly Claudioperla tigrina (Plecoptera: Gripopterygidae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reynaga]]></surname>
<given-names><![CDATA[María Celina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dávalos]]></surname>
<given-names><![CDATA[Natalia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molineri]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Tucumán CONICET (Consejo Argentino de Investigaciones Científicas y Técnicas) Facultad de Ciencias Naturales e IML]]></institution>
<addr-line><![CDATA[San Miguel de Tucumán ]]></addr-line>
<country>AR</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<volume>65</volume>
<numero>3</numero>
<fpage>1174</fpage>
<lpage>1184</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442017000301174&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442017000301174&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442017000301174&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenLa determinación de los hábitos alimentarios permite la comprensión de muchos procesos ecológicos que se dan en los ecosistemas lóticos. El objetivo de este trabajo es: 1) conocer los hábitos alimentarios de ninfas de Claudioperla tigrina en un amplio gradiente altitudinal y latitudinal en Argentina; 2) asignar el grupo funcional trófico (GFT) de C. tigrina; 3) evaluar diferencias entre dietas de los sitios estudiados. Las ninfas estudiadas fueron recolectadas a lo largo de un amplio rango espacial en el noroeste de Argentina e incluyen diferentes estados del desarrollo (cuatro clases de tamaño). El material ingerido fue extraído de la parte anterior del tubo digestivo mediante disección ventral del tórax. Los perfiles dietarios fueron analizados a través de la estimación de parámetros de la distribución multinomial de Dirichlet. Se efectuaron ANOVA&#8217;s para cada rubro alimentario en función de los sitios. Se utilizó la técnica Multidimensional Scaling (MDS) para identificar los sitios con perfiles alimentarios promedios similares. Se realizó un análisis de amplitud de nicho trófico para evaluar la diversificación de los recursos consumidos en cada sitio. El aparato bucal no muestra variaciones a lo largo del desarrollo ninfal, excepto una mayor esclerotización con la edad. Poseen palpos mandibulares y maxilares relativamente cortos y mandíbulas y maxilas fuertes, esclerozadas y dentadas. Las ninfas ingirieron más de un ítem alimentario, sugiriendo que se trata de una especie flexible en su alimentación. El ítem dominante en la dieta fue la MOPG, los signos de haber sido masticado indican hábitos trituradores. Se encontraron diferencias entre sitios para los ítems MOPF, invertebrados, algas y sedimento, pero no para MOPG. Se obtuvieron las correlaciones para cada eje del análisis MDS. Con el eje 1 se correlacionaron negativamente los sitios AP, LT, LI, C y M (Selva de Yungas y Pastizal de neblina) asociados a un mayor consumo de MOPF, en el lado positivo del eje se encontró el sitio P (Altos Andes) asociado a los ítems invertebrados y sedimento. Para el eje 2 se relacionaron positivamente IN (Pastizal neblina) y LR (Monte de Sierras y Bolsones) con la presencia de algas. Los resultados del análisis de amplitud de nicho revelaron diferencias en el uso de los recursos secundarios de la dieta en los sitios estudiados que puede deberse a la oferta ambiental en las ecorregiones consideradas. El GFT de C. tigrina es triturador/ recolector en Selva de Yungas y Pastizales de Neblina y triturador/ depredador en Altos Andes. La definición del GFT de C. tigrina y el establecimiento de su rol como procesador primario de materia orgánica representa un paso importante para futuros estudios de redes tróficas y otras metodologías basadas en los grupos funcionales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractDietary information gives insight into several ecological processes acting in lotic ecosystems. This work aimed: 1) to identify the dietary habits of Claudioperla tigrina immature stages along a wide altitudinal as well as latitudinal gradient in North Argentina; 2) to define the functional feeding group (FFG) of C. tigrina; 3) to evaluate differences in diet in the studied sites. Studied nymphs were collected from localities widely scattered in Northwestern Argentina and they fell into different developmental stages (four size classes). The ingested material was extracted from the foregut and midgut by using thorax ventral dissection. Dietary profiles were analyzed through the estimation of parameters associated with a Dirichletmultinomial distribution. ANOVA&#8217;s were performed for each food item using sites as factor. Multidimensional Scaling was used to identify sites with similar dietary profiles. An analysis of food-niche breadth was also performed to evaluate the degree of dietary diversification for the resources consumed in each site. Mouthparts are similar across the different size classes, excepting the increasing sclerotization recorded with age. Mouthparts retained most of the typical chewing groundplan, showing relatively short labial and maxillar palps, and strong, sclerotized and denticulated mandibles and maxillae. Our results pointed out that the nymphs of C. tigrina always ingest two or more food items (CPOM, FPOM, invertebrates and algae), suggesting thus a flexible diet. The diet changed in relation to body size, while finer particles were consumed in the early stages, larger particles were ingested in final stages. Coarse particulate organic matter was the dominant food item, with signals of shredding during ingestion. Differences between sites for FPOM, invertebrates, algae and sediment were detected, but not for MOPG. Correlations were obtained for the first two axis of the MDS analysis. Sites AP, LT, LI, C and M (Yungas Rainforest and Humid Grassland) were negatively correlated with the axis 1 which was associated with increased consumption of FPOM. On the positive side of the axis the site P (High Andes) is associated with a greater proportion of invertebrates and sediment. The sites IN (Humid Grassland) and LR (Argentine Northwest Monte and Thistle of the Prepuna) were located at the positive domain of axis 2 which is in turn associated with a greater count of algae in the dietary contents. We found significant differences in the quantity of secondary items, and this is likely related with the resources environmental availability. The FFG of Claudioperla tigrina is primarily shredder/collector-gatherer in Yungas Rainforest and Humid Grassland shredder/predator in High Andes. FFG classification of C. tigrina and the definition of their role for organic matter processing is an important step for future studies based on functional groups such as analysis of food webs. Rev. Biol. Trop. 65 (3): 1174-1184. Epub 2017 September 01.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[grupos funcionales tróficos]]></kwd>
<kwd lng="es"><![CDATA[contenido estomacal]]></kwd>
<kwd lng="es"><![CDATA[selva de Yungas]]></kwd>
<kwd lng="es"><![CDATA[Pastizales de Neblina]]></kwd>
<kwd lng="es"><![CDATA[Altos Andes]]></kwd>
<kwd lng="es"><![CDATA[Monte de sierras y bolsones]]></kwd>
<kwd lng="en"><![CDATA[functional feeding groups]]></kwd>
<kwd lng="en"><![CDATA[gut content analysis]]></kwd>
<kwd lng="en"><![CDATA[Yungas Rainforest]]></kwd>
<kwd lng="en"><![CDATA[Humid Grasslands]]></kwd>
<kwd lng="en"><![CDATA[High Andes]]></kwd>
<kwd lng="en"><![CDATA[Argentine Northwest Monte and Thistle of the Prepuna]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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