<?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>0188-8897</journal-id>
<journal-title><![CDATA[Hidrobiológica]]></journal-title>
<abbrev-journal-title><![CDATA[Hidrobiológica]]></abbrev-journal-title>
<issn>0188-8897</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-88972015000300365</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Distribución de pigmentos fotosintéticos del fitoplancton del Golfo de Tehuantepec en verano (junio, 2003): importancia del picofitoplancton]]></article-title>
<article-title xml:lang="en"><![CDATA[Distribution of photosynthetic pigments of phytoplankton from the Gulf of Tehuantepec in summer (June, 2003): importance of the picophytoplankton]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Becerril]]></surname>
<given-names><![CDATA[David Uriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Tachiquín]]></surname>
<given-names><![CDATA[Luis Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Machain-Castillo]]></surname>
<given-names><![CDATA[María Luisa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monreal-Gómez]]></surname>
<given-names><![CDATA[María Adela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias del Mar y Limnología ]]></institution>
<addr-line><![CDATA[D.F. México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>25</volume>
<numero>3</numero>
<fpage>365</fpage>
<lpage>374</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972015000300365&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972015000300365&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972015000300365&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Existen estudios previos sobre fitoplancton y sus grupos taxonómicos y especies, así como de su biomasa y productividad primaria, principalmente en invierno y primavera, pero se conoce poco la estructura del fitoplancton del Golfo de Tehuantepec en verano. Aquí se dan a conocer la composición y distribución de pigmentos fotosintéticos fitoplanctónicos en condiciones de verano. Se obtuvieron datos hidrográficos en nueve estaciones durante un crucero oceanográfico en junio, 2003, y se analizaron cinco pigmentos, Fucoxantina, Prasinoxantina, Violaxantina, Zeaxantina (indicador de Synechococcus, procarionte del picoplancton) y Divinil-clorofila a (diagnóstico de Prochlorococcus, otro procarionte del picoplancton). La columna de agua se encontró estratificada: la capa superficial, definida por la profundidad del tope de la termoclina, varió entre 20 y 35 m de espesor. Los valores de todos los pigmentos fueron bajos, pero mostraron patrones similares de distribución vertical, con un pico de concentración subsuperficial (entre 30 y 40 m), destacando Divinil-clorofila a en la mayoría de las estaciones, excepto en la 3 y 4, donde la Fucoxantina fue el principal pigmento. Estos picos no siempre coincidieron con la profundidad de la termoclina en cada estación, generalmente éstos se encontraron por debajo de ella. Este escenario muestra al picoplancton como una fracción importante en verano (al menos en junio), contrastando notablemente con la condición de invierno-primavera, de intensa mezcla turbulenta y surgencias, donde el microplancton y las diatomeas predominan.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: There exist previous studies on phytoplankton, its taxonomic groups and species, its biomass and primary productivity, mainly in winter and spring, but the structure of the phytoplankton from the Gulf of Tehuantepec in summer is poorly known. The composition and distribution of the phytoplankton photosynthetic pigments in summer conditions are provided in this paper. Hydrographic data from nine stations, during an oceanographic cruise in June, 20013, and analysis of five major phytoplanktonic pigments, Fucoxanthin, Prasinoxanthin, Violaxanthin, Zeaxanthin (marker of Synechococcus, picoplanktonic prokaryote) and Divinyl-chlorophyll a (diagnostic of Prochlorococcus, another picoplanktonic prokaryote) are given. Column water was well-stratified: surface layers had a thickness between 20 and 35 m, with well-defined thermoclines at those depths. Values of all pigments were low, but they showed similar vertical distribution patterns, with subsurface maxima peaks (between 30 and 40 m), especially Divinyl-chlorophyll a in most stations, except 3 and 4, where Fucoxanthin was the most important pigment. These peaks did not always coincide with the depths of the main thermocline at each station, buy usually they were found below the thermocline. This scenery shows the picoplankton as a very important size-fraction group in summer (at least in June), strongly contrasting with the winter-spring conditions, of intense turbulent mix and upwellings, where microplankton and diatoms appear to predominate.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fases estacionales]]></kwd>
<kwd lng="es"><![CDATA[fitoplancton]]></kwd>
<kwd lng="es"><![CDATA[Golfo de Tehuantepec]]></kwd>
<kwd lng="es"><![CDATA[picoplancton]]></kwd>
<kwd lng="es"><![CDATA[pigmentos fotosintéticos]]></kwd>
<kwd lng="en"><![CDATA[Gulf of Tehuantepec]]></kwd>
<kwd lng="en"><![CDATA[phytoplankton]]></kwd>
<kwd lng="en"><![CDATA[picoplankton]]></kwd>
<kwd lng="en"><![CDATA[photosynthetic pigments]]></kwd>
<kwd lng="en"><![CDATA[seasonal phases]]></kwd>
</kwd-group>
</article-meta>
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<page-range>29-45</page-range></nlm-citation>
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</article>
