<?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>S0188-88972016000100012</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Intraspecific karyotypic variation in the silverside fish Chirostoma humboldtianum (Atheriniformes: Atherinopsidae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Variación cariotípica intraespecífica en el pez blanco Chirostoma humboldtianum (Atheriniformes: Atherinopsidae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Urbina-Sánchez]]></surname>
<given-names><![CDATA[Irma]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paniagua-Chávez]]></surname>
<given-names><![CDATA[Carmen Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fierro]]></surname>
<given-names><![CDATA[Reyna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Figueroa-Lucero]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barriga-Sosa]]></surname>
<given-names><![CDATA[Irene de los Angeles]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Metropolitana Unidad Iztapalapa Doctorado en Ciencias Biológicas y de la Salud]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California Departamento de Acuicultura ]]></institution>
<addr-line><![CDATA[Ensenada B.C.]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Metropolitana Unidad Iztapalapa Departamento de Ciencias de la Salud]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma Metropolitana Unidad Iztapalapa Departamento de Hidrobiología]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<volume>26</volume>
<numero>1</numero>
<fpage>93</fpage>
<lpage>101</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972016000100012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972016000100012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972016000100012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Within its genus, Chirostoma humboldtianum is one of the species with the widest distribution, inhabiting lake and pond environments along the Lerma-Santiago basin in the Mexican Plateau. Although the species is of great ichthyological, economic, and cultural relevance, factors related to human activity such as habitat loss, pollution, overfishing, and introduction of non-native fish have played important roles in the decline and disappearance of populations. With the aim of describing the karyotype of the species, 22 specimens of C. humboldtianum were collected and their chromosomes obtained from gills based on Denton (1973). Here we reveal intraspecific chromosome variation, characterized by five cytotypes found in four studied populations: 1) Las Tazas, Tiacaque dam (2n = 48, FN = 58) with chromosome formula 6m + 4sm + 38t; 2); Villa Victoria dam (2n = 48, FN = 54) 2m + 2sm + 2st + 42t; 3) Tepuxtepec dam, with two cytotypes (2n = 48, FN = 50) 8m + 2sm + 38t and (4n = 96, FN = 116) 8m + 2st + 38t; 4) and San Pedro Lagunillas lagoon (2n = 48, FN = 58) 8m + 2sm + 38t. We observed chromosome variation in the morphology of pairs 1, 2, 4, and 5. Results allow us to suggest that pericentric inversions are the source of intraspecific chromosome variation. Comparative analyses support the hypothesis that the karyotype of the population from Villa Victoria dam represents the primitive form for the species.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Chirostoma humboldtianum es dentro del género, una de las especies con la más amplia distribución, habita ambientes lacustres y cuerpos de agua a lo largo del sistema Lerma-Santiago en la Mesa Central de México. Aunque la especie es de gran relevancia ictiológica, económica y cultural, factores relacionados con la actividad humana como la pérdida de hábitat, contaminación, sobrepesca y la introducción de peces no-nativos, han jugado un papel importante en la disminución y desaparición de poblaciones. Con el propósito de describir el cariotipo de la especie, se colectaron 22 individuos de C. humboldtianum y sus cromosomas se obtuvieron a partir de branquias de acuerdo a Denton (1973). En el presente trabajo se revela variación cromosómica intraespecífica caracterizada por cinco citotipos de cuatro poblaciones estudiadas: 1) Presa Las Tazas, Tiacaque (2n = 48, NF = 58) con las fórmulas cromosómicas 6m + 4sm + 38t; 2) Presa Villa Victoria (2n = 48, NF = 54) 2m + 2sm + 2st+42t; 3) Presa Tepuxtepec, con dos citotipos (2n = 48, NF = 50) 8m + 2sm + 38t y (4n = 96, NF = 116), 8m + 2st + 38t; 4) y Laguna San Pedro Lagunillas (2n = 48, NF = 58) 8m + 2sm + 38t. La variación cromosómica se detectó principalmente en la morfología de los pares 1, 2, 4 y 5. Los resultados encontrados permiten sugerir la presencia de inversiones pericéntricas como el principal mecanismo de variación cromosómica intraespecífica. El análisis comparativo de los datos apoya la hipótesis de que el cariotipo de la población Villa Victoria representa, la forma cromosómica primitiva de la especie.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Karyotype]]></kwd>
<kwd lng="en"><![CDATA[Shortfin silverside]]></kwd>
<kwd lng="en"><![CDATA[polyploidy]]></kwd>
<kwd lng="en"><![CDATA[variation]]></kwd>
<kwd lng="es"><![CDATA[Citotipo]]></kwd>
<kwd lng="es"><![CDATA[pez blanco]]></kwd>
<kwd lng="es"><![CDATA[poliploidía]]></kwd>
<kwd lng="es"><![CDATA[variación]]></kwd>
</kwd-group>
</article-meta>
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