<?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>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992017000200215</article-id>
<article-id pub-id-type="doi">10.20937/rica.2017.33.02.03</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[CHOLINESTERASE ACTIVITY IN CRASSOSTREA sp. OF NAYARIT (NW MEXICO) COASTAL WATERS]]></article-title>
<article-title xml:lang="es"><![CDATA[ACTIVIDAD DE LA COLINESTERASA EN CRASSOSTREA sp. EN LAS AGUAS COSTERAS DE NAYARIT (NO DE MÉXICO)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bautista-Covarrubias]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villaseñor]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bueno]]></surname>
<given-names><![CDATA[Adela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Voltolina]]></surname>
<given-names><![CDATA[Domenico]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Frías-Espericueta]]></surname>
<given-names><![CDATA[Martín Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Nayarit Secretaría de Investigación y Postgrado ]]></institution>
<addr-line><![CDATA[Tepic Nayarit]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Nayarit Unidad Académica de Ciencias Químico Biológicas y Farmacéuticas ]]></institution>
<addr-line><![CDATA[Tepic Nayarit]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Sonora Centro de Investigaciones Biológicas del Noroeste Laboratorio de Estudios Ambientales]]></institution>
<addr-line><![CDATA[Mazatlán Sinaloa]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Univ Autónoma de Sinaloa Facultad de Ciencias del Mar ]]></institution>
<addr-line><![CDATA[Mazatlan Sinaloa]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>33</volume>
<numero>2</numero>
<fpage>215</fpage>
<lpage>220</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992017000200215&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992017000200215&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992017000200215&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Cholinesterases (ChE) have been suggested as biomarkers of the presence of organophosphorus insecticides (OP). The activities of these enzymes were determined in abductor muscle, gills and labial palps of oysters collected during the rainy and the dry seasons at eight points of the coastal zone of Nayarit state (NW Mexico), aiming to determine if their variability is related to geographic and seasonal differences in the use of OP. At all stations, ChE mean activity was lower in the dry than in the rainy season, and the muscle had consistently lower values than gills and labial palps. Lower activities were found in Bahía de Banderas, in the southern part of the state, than in the northern stations. This may be explained by the year-round use of OP insecticides in the southern part of the state, whereas herbicides are the most common pesticides used in agricultural areas draining into the northern stations during the rainy season.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las colinesterasas (ChE) se han propuesto como biomarcadores de la presencia de plaguicidas organofosforados (OF). Se determinó la actividad de estas enzimas en el músculo aductor, las branquias y los palpos labiales de ostras recolectadas durante los periodos de lluvias y estiaje en ocho sitios de muestreo ubicados en la zona costera del estado de Nayarit (noroeste de México), con la finalidad de determinar si su variabilidad está relacionada con diferencias geográficas o estacionales en el uso de OF. En todas las estaciones, la actividad de ChE resultó menor en estiaje que durante el periodo de lluvias, y los valores encontrados en el músculo fueron constantemente menores que en las branquias y los palpos labiales. La actividad de ChE fue menor en los organismos recolectados en Bahía de Banderas, en la parte sur del estado, que en las estaciones del norte, probablemente debido al uso de OF durante todo el año en el sur, mientras que los herbicidas son los plaguicidas más usados en las áreas agrícolas que descargan sus efluentes en las áreas de muestreo de la parte norte.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[esterases]]></kwd>
<kwd lng="en"><![CDATA[tissue-related differences]]></kwd>
<kwd lng="en"><![CDATA[seasonal differences]]></kwd>
<kwd lng="en"><![CDATA[geographic differences]]></kwd>
<kwd lng="en"><![CDATA[organophosphorus insecticides]]></kwd>
<kwd lng="es"><![CDATA[esterasas]]></kwd>
<kwd lng="es"><![CDATA[diferencias en tejidos]]></kwd>
<kwd lng="es"><![CDATA[diferencias estacionales]]></kwd>
<kwd lng="es"><![CDATA[diferencias geográficas]]></kwd>
<kwd lng="es"><![CDATA[insecticidas organofosforados]]></kwd>
</kwd-group>
</article-meta>
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