<?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>S0034-77442019000500092</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v67is5.38933</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variación espacio-temporal de diversidad y densidad de los poliquetos pelágicos en la Bahía de Acapulco, Guerrero, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Spatio-temporal variation of the diversity and density of the pelagic polychaetes in Acapulco Bay, Guerrero, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Álamo]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roa-Venicio]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Herrera]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,UNAM  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional  ]]></institution>
<addr-line><![CDATA[ Baja California Sur]]></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>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2019</year>
</pub-date>
<volume>67</volume>
<fpage>92</fpage>
<lpage>100</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442019000500092&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442019000500092&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442019000500092&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: Desde un punto de vista global, los poliquetos que habitan en la comunidad pelágica han sido poco estudiados, aunque son un eslabón importante en las cadenas alimentarias de los ecosistemas marinos.  Objetivo:  Este trabajo contribuye al conocimiento de esta importante comunidad, analizando la riqueza y la densidad de los poliquetos.  Métodos:  Las muestras de plancton se tomaron en 17 localidades durante mayo y diciembre de 2013 en el área de estudio, mediante arrastres superficiales en una embarcación con un motor fuera de borda. Utilizamos una red con un diámetro de boca de 0.3 m, una longitud de 1.30 m y una abertura de malla de 0.3 mm. De cada muestra recolectada, los poliquetos se separaron y determinaron al nivel taxonómico más bajo posible.  Resultados:  Cuantificamos un total de 1873 individuos, con una variación importante en la densidad relativa, ya que en mayo se registraron 7 952.0 ind/100m3, mientras que en diciembre solo hubo 882.1 ind/100m3. Se analizaron las diferencias en la composición y densidad de los poliquetos determinados, de los cuales la proporción más alta pertenece a las formas larvales de las poblaciones bentónicas (meroplancton) y la más baja a los organismos del holoplancton. Durante los dos periodos de estudio se observaron trece familias, de las cuales, Sabellariidae, Spionidae, Chaetopteridae, Magelonidae, Iospilidae y Typhloscolecidae fueron comunes en ambos periodos, mientras que Aphroditidae, Syllidae, Phyllodocidae y Alciopidae fueron exclusivas de mayo y Serpullidae, Sabellidae y Lopadorhynchidae solo se encontraron en diciembre.  Conclusiones:  Es importante señalar que las variaciones observadas proporcionan valiosa información sobre los ciclos de vida y los aspectos biogeográficos de los poliquetos en el área de estudio.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: From a global point of view, polychaetes that inhabit in the pelagic community have been little studied, although they are an important link in the food chains of marine ecosystems.  Objective: To analyze the local richness and density of polychaetes.  Methods:  Plankton samples were taken in 17 localities during May and December 2013, through surface trawls in a barge with an outboard motor. We used a net with 0.3 m mouth diameter, 1.30 m long and a 0.3 mm aperture mesh. From each collected sample, polychaetes were separated and determined at the lowest possible taxonomic level.  Results: We collected a total of 1 873 individuals, with an important variation in relative density, since in May 7 952.0 ind/100m3 were recorded, while in December there were only 882.1 ind/100m3. The differences in the composition and density of the determined polychaetes, were analyzed, of which the highest proportion belongs to the larval forms of the benthic (meroplankton) populations, and the lowest proportion to holoplankton organisms. During the two periods of study were observed thirteen families, from which Sabellariidae, Spionidae, Chaetopteridae, Magelonidae, Iospilidae and Typhloscolecidae were common in both periods, while Aphroditidae, Syllidae, Phyllodocidae and Alciopidae were observed only in May, and Serpulidae, Sabellidae and Lopadorhynchidae were observed only in December.  Conclusions:  It is important to point out that the observed variations provide valuable information about the life cycles and the biogeographic aspects of the polychaetes in the study area.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[marine worms]]></kwd>
<kwd lng="en"><![CDATA[zooplankton]]></kwd>
<kwd lng="en"><![CDATA[ecology]]></kwd>
<kwd lng="en"><![CDATA[Mexican Pacific]]></kwd>
<kwd lng="es"><![CDATA[gusanos marinos]]></kwd>
<kwd lng="es"><![CDATA[zooplancton]]></kwd>
<kwd lng="es"><![CDATA[ecología]]></kwd>
<kwd lng="es"><![CDATA[Pacífico mexicano]]></kwd>
</kwd-group>
</article-meta>
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