<?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>S0034-77442020000401073</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v68i4.40588</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Feeding habits of the fishes Euthynnus lineatus and Scomberomorus sierra (Perciformes: Scombridae) in the Eastern Tropical Pacific]]></article-title>
<article-title xml:lang="es"><![CDATA[Hábitos alimentarios de los peces Euthynnus lineatus y Scomberomorus sierra (Perciformes: Scombridae) en el Pacífico Tropical Oriental]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval-Ramírez]]></surname>
<given-names><![CDATA[Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerdenares-Ladrón-de-Guevara]]></surname>
<given-names><![CDATA[Genoveva]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Herrera]]></surname>
<given-names><![CDATA[Agustín-Aucencio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Violante-González]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Ibáñez]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Gómez]]></surname>
<given-names><![CDATA[Juan-Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Guerrero  ]]></institution>
<addr-line><![CDATA[ Guerrero]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Mar  ]]></institution>
<addr-line><![CDATA[ Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Guerrero  ]]></institution>
<addr-line><![CDATA[ Guerrero]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma de Guerrero  ]]></institution>
<addr-line><![CDATA[ Guerrero]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>68</volume>
<numero>4</numero>
<fpage>1073</fpage>
<lpage>1083</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442020000401073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442020000401073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442020000401073&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Black skipjack, Euthynnus lineatus, and Pacific sierra, Scomberomorus sierra, are of great economic importance in the small-scale fishery of the Tropical Eastern Pacific and in particular in the study area.  Objectives:  The objectives of the present study were to assess the diet components of E. lineatus and S. sierra, as well as to evaluate the niche width, trophic level, and trophic overlap between the two species, by size and season.  Methods:  Biological samples were obtained weekly from small-scale fishery catches in Bahía de Acapulco, Mexico. The E. lineatus sampling period occurred from October 2016 to October 2017, whereas S. sierra was sampled from October 2016 to June 2018. The Prey-specific Index of Relative Importance (% PSIRI) was used to evaluate the importance of each prey item in the diet of the predator. Levin´s index (Bi) was used as a measure of niche width. The Morisita-Horn index was used to evaluate diet overlap by size (juveniles or adults), by season (dry or wet), and between the two species. The trophic level (TL) of predators was calculated using the Cortés´ method.  Results:  A total of 262 E. lineatus stomachs were analyzed (42 % were empty and 58 % contained food) and a total of 209 S. sierra stomachs were analyzed (74.6 % were empty and 25.3 % contained food). Of the total E. lineatus specimens sampled, 107 were juveniles and 155 were adults. Black skipjack juveniles fed on five food items and adults fed on 13 food items. Of the total S. sierra specimens sampled, 75 were juveniles and 134 were adults. Pacific sierra juveniles and adults fed on five food items. The diet of the two species comprised fish, mollusks, and crustaceans. The two species showed narrow niche width. The diet of juvenile and adult E. lineatus presented differences with growth, contrary to what was observed for juveniles and adults of S. sierra. There were no significant differences in diet by season for both species. The trophic overlap obtained between the two species was low. The trophic level calculated for both species indicated that are tertiary consumers.  Conclusions:  Black skipjack and Pacific sierra are tertiary predators and present a specialist behavior, feeding mainly on fish from the families Engraulidae and Clupeidae. Although a degree of similarity in the dietary food components of these species was observed, there was not a high degree of interspecific competition for food.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: El barrilete negro, Euthynnus lineatus, y la sierra del Pacífico, Scomberomorus sierra, son peces que presentan gran importancia económica en la pesca artesanal del Pacífico Tropical Oriental y de manera particular en el área de estudio.  Objetivos: Los objetivos del presente trabajo son determinar los componentes alimentarios de la dieta de E. lineatus y S. sierra, así como determinar la amplitud del nicho, el nivel trófico y el traslape trófico entre ambas especies, por tallas y por temporada climática.  Métodos:  Las muestras biológicas se obtuvieron semanalmente de las capturas realizadas por las pesquerías de pequeña escala llevadas a cabo en la Bahía de Acapulco. El periodo de muestreo de E. lineatus se realizó desde octubre 2016 hasta octubre 2017, mientras que el de S. sierra de octubre 2016 hasta junio 2018. El Índice de Importancia Relativa Específica de la Presa (% PSIRI) se usó para evaluar la importancia de cada ítem presa en la dieta del depredador; el índice de Levin (Bi) se usó como una medida de la amplitud del nicho; el índice de Morisita-Horn se usó para evaluar el traslape entre las dietas por talla (juveniles y adultos), por temporada climática (seca y lluviosa) y entre las dos especies. El nivel trófico (TL) de los depredadores fue calculado usando el método de Cortés.  Resultados: Se analizaron en total 262 estómagos de E. lineatus (42 % vacíos y 58 % con alimento) y 209 estómagos de S. sierra (74.6 % vacíos y 25.3 % con alimento). Del total de organismos muestreados de E. lineatus, 107 se consideraron organismos jóvenes y 155 adultos. Los jóvenes de barrilete se alimentaron de 5 ítems alimentarios y los adultos se alimentaron de 13. En el caso de S. sierra, 75 organismos se consideraron jóvenes y 134 adultos. Los jóvenes y adultos de sierra se alimentaron de cinco ítems alimentarios. La dieta de ambas especies se compone por peces, moluscos y crustáceos. Las dos especies presentaron una amplitud del nicho trófico estrecho. La dieta de jóvenes y adultos de E. lineatus presentó diferencias alimentarias de acuerdo con su crecimiento, contrario a lo observado entre jóvenes y adultos de S. sierra. Entre temporadas climáticas, la dieta no presentó variaciones significativas en ambas especies. Asimismo, el valor de traslape trófico obtenido entre ambas especies fue bajo. El nivel trófico determinado para ambas especies indicó que son consumidores terciarios.  Conclusiones:  El barrilete negro Euthynnus lineatus y la sierra del Pacifico Scomberomorus sierra son depredadores terciarios y presentan un comportamiento especialista, principalmente sobre peces de las familias Engraulidae y Clupeidae. Aunque se observó una similitud en los componentes alimentarios de estas especies, no existe un alto grado de competencia interespecífica por el alimento.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[diet]]></kwd>
<kwd lng="en"><![CDATA[black skipjack]]></kwd>
<kwd lng="en"><![CDATA[Pacific sierra]]></kwd>
<kwd lng="en"><![CDATA[niche width]]></kwd>
<kwd lng="en"><![CDATA[trophic level]]></kwd>
<kwd lng="en"><![CDATA[competition]]></kwd>
<kwd lng="en"><![CDATA[Tropical Eastern Pacific]]></kwd>
<kwd lng="es"><![CDATA[dieta]]></kwd>
<kwd lng="es"><![CDATA[barrilete negro]]></kwd>
<kwd lng="es"><![CDATA[sierra del Pacífico]]></kwd>
<kwd lng="es"><![CDATA[amplitud del nicho]]></kwd>
<kwd lng="es"><![CDATA[nivel trófico]]></kwd>
<kwd lng="es"><![CDATA[competencia]]></kwd>
<kwd lng="es"><![CDATA[Pacífico Oriental Tropical]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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