<?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>S0188-49992020000400967</article-id>
<article-id pub-id-type="doi">10.20937/rica.53674</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[THE MEXICAN AXOLOTL´S (Ambystoma mexicanum) EARLY DEVELOPMENT AND SURVIVAL IS AFFECTED BY COMMERCIAL GRADE MALATHION AND DICHLORVOS ORGANOPHOSPHORUS PESTICIDES]]></article-title>
<article-title xml:lang="es"><![CDATA[EL DESARROLLO TEMPRANO Y SOBREVIVENCIA DEL AJOLOTE MEXICANO ( Ambystoma mexicanum) SON AFECTADOS POR LOS PESTICIDAS ORGANOFOSFORADOS MALATIÓN Y DICLORVOS DE GRADO COMERCIAL]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castán-Aquino]]></surname>
<given-names><![CDATA[Yutzil Irene]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arias-Balderas]]></surname>
<given-names><![CDATA[Sandra Fabiola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojo-Salinas]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes-Rangel]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Trujillo]]></surname>
<given-names><![CDATA[Iram Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís-Castro]]></surname>
<given-names><![CDATA[Oscar Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala ]]></institution>
<addr-line><![CDATA[Tlalnepantla Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>36</volume>
<numero>4</numero>
<fpage>967</fpage>
<lpage>975</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992020000400967&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992020000400967&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992020000400967&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The wild population of the Mexican axolotl (Ambystoma mexicanum) is subject to a dramatic decline as a consequence of deteriorating conditions in its natural habitat, Xochimilco. The common use of organophosphorus pesticides (OPPs) in the region affects water quality and is partially responsible for the axolotl decline. This could be a consequence of the delicate nature of axolotls, which are struggling to survive under contaminated conditions at early stages of development. In this regard, we aimed to extend the knowledge of OPPs effect on the survival of axolotls in their early stage of development, within the context of detrimental environment conditions using commercial grade OPPs. Fertilized axolotl eggs were treated with malathion (MLT), dichlorvos (DDVP), and a depurated group in which the OPPs exposure was stopped earlier, as well as an untreated control group. Changes in hatching, survival, size, and morphology were monitored and analyzed in embryos and early larvae. Our results showed that MLT and DVPP accelerate egg hatching and mortality even after the early removal of OPPs from the medium. OPPs also caused a reduced size and morphological abnormalities. It is proposed that such abnormalities would jeopardize the survival of the wildlife axolotl. Our results suggest that OPPs can cause irreversible damage to the axolotl embryos, stopping their normal development, causing death and reducing their chances of survival in their natural environment.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La población silvestre del ajolote mexicano (Ambystoma mexicanum) presenta un alarmante declive como consecuencia del deterioro de su medio ambiente: Xochimilco. El uso de pesticidas organofosforados (OF) en la región afecta la calidad del agua y es parcialmente responsable de dicho declive, lo cual puede deberse a la fragilidad del ajolote en etapas tempranas de su desarrollo, cuando se enfrenta a un medio contaminado con OF para sobrevivir. En este sentido, nuestro objetivo fue estudiar el efecto de los OF de grado comercial en el desarrollo temprano del ajolote, resaltando el contexto ambiental deteriorado. Los huevos fertilizados de este anfibio fueron expuestos a malatión (MLT), diclorvos (DVPP) y un grupo depurado en que se detuvo anticipadamente la exposición a los OF, así como un grupo control sin tratamiento. La eclosión, sobrevivencia, tamaño y forma de los organismos fueron monitoreados y analizados en la etapa embriónica y larval. Nuestros resultados muestran que los MLT y DVPP aceleran el tiempo de eclosión y la mortalidad aun después de remover los OF del medio. Los OF también son causantes de un tamaño reducido y una morfología anormal en los grupos tratados con pesticidas. Se propone que las mencionadas anormalidades propician condiciones adversas para la sobrevivencia del ajolote en su hábitat. Los resultados sugieren que los OF causan un daño irreversible en su embrión, deteniendo el desarrollo normal, ocasionando mortandad y reduciendo las probabilidades de éxito en su hábitat natural.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[amphibian development]]></kwd>
<kwd lng="en"><![CDATA[water pollution]]></kwd>
<kwd lng="en"><![CDATA[conservation strategies]]></kwd>
<kwd lng="en"><![CDATA[Xochimilco]]></kwd>
<kwd lng="es"><![CDATA[desarrollo de anfibios]]></kwd>
<kwd lng="es"><![CDATA[contaminación acuática]]></kwd>
<kwd lng="es"><![CDATA[estrategias de conservación]]></kwd>
<kwd lng="es"><![CDATA[Xochimilco]]></kwd>
</kwd-group>
</article-meta>
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