<?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>S0188-88972015000300411</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Microcystins production in Microcystis induced by Daphnia pulex (Cladocera) and Brachionus calyciflorus (Rotifera)]]></article-title>
<article-title xml:lang="es"><![CDATA[Producción de microcistinas en Microcystis inducida por Daphnia pulex (Cladocera) y Brachionus calyciflorus (Rotifera)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Morales]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sarma]]></surname>
<given-names><![CDATA[S. S. S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nandini]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Colima Centro Universitario de Investigaciones Oceanológicas ]]></institution>
<addr-line><![CDATA[Manzanillo Colima]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Campus Iztacala División de Investigación y Estudios de Posgrado]]></institution>
<addr-line><![CDATA[ Estado de 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>411</fpage>
<lpage>415</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972015000300411&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972015000300411&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972015000300411&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Freshwater cyanobacteria often are the predominant division of phytoplankton in eutrophic environments. Microcystis is a bloom-forming cyanobacterium, commonly found in urban lakes of central Mexico. Several biotic factors including the presence of zooplankton induce the production of toxins (microcystins, MCs) in Microcystis. Here, it present data on the effect of the presence of the cladoceran Daphnia pulex (Leydig, 1860) and the rotifer Brachionus calyciflorus (Pallas, 1776) on total MCs production in Microcystis spp. Results indicate that Microcystis spp. with or without the presence of zooplankton (controls), contained certain level of MCs (1.32 to 3.98 x 10-4 ng/cell). At low cell density of Microcystis spp. (0.5 x 106 cells/mL) and, in the presence of high zooplankton abundance (25 cladocerans or 250 rotifers, in 50 mL), the MCs concentration was significantly higher as compared to controls. Moreover, under low zooplankton density and at low density of Microcystis spp., the MCs levels did not vary significantly. Compared to rotifers, the presence of cladocerans resulted in higher MCs levels. This work demonstrates that zooplankton presence may induce microcystins production in Microcystis spp.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Las cianobacterias de agua dulce regularmente son la división predominante del fitoplancton en ambientes eutrofizados. Microcystis es una cianobacteria formadora de florecimientos, comúnmente encontrada en lagos urbanos del centro de México. Diversos factores bióticos incluyendo la presencia de zooplancton inducen la producción de toxinas (microcistinas, MCs) en Microcystis. En este trabajo se presentan datos sobre el efecto de la presencia del cladócero Daphnia pulex (Leydig, 1860) y del rotífero Brachionus calyciflorus (Pallas, 1776) en la producción total de MCs en Microcystis spp. Los resultados indicaron que Microcystis spp. con o sin presencia de zooplancton (controles), contiene ciertos niveles de MCs (1.32 a 3.98 x 10-4 ng/cél). A baja densidad celular de Microcystis spp. (0.5 x 106 cél/mL) y con la presencia de altas abundancias de zooplancton (25 cladóceros o 250 rotíferos, en 50 mL), la concentración de MCs fue significativamente mayor al compararla con los controles. Además, con una baja densidad de zooplancton y una baja densidad de Microcystis spp., el nivel de MCs no varió significativamente. En comparación con rotíferos, la presencia de cladóceros resultó en niveles altos de MCs. Este trabajo demostró que la presencia de zooplancton puede inducir la producción de microcistinas en Microcystis spp.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cyanobacteria]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[microcystins detection]]></kwd>
<kwd lng="en"><![CDATA[microcystins production]]></kwd>
<kwd lng="en"><![CDATA[zooplankton]]></kwd>
<kwd lng="es"><![CDATA[Cianobacterias]]></kwd>
<kwd lng="es"><![CDATA[detección de microcistinas]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[producción de microcistinas]]></kwd>
<kwd lng="es"><![CDATA[zooplancton]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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