<?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>S0188-88972023000300329</article-id>
<article-id pub-id-type="doi">10.24275/lczi5134</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Differential effects on the toxicity and bioconcentration of hexavalent and trivalent chromium on the rotifer Lecane papuana (Murray, 1913) (Monogononta: Lecanidae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectos diferenciales en la toxicidad y bioconcentración de Cromo hexavalente y trivalente en el rotífero Lecane papuana (Murray, 1913) (Monogononta: Lecanidae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garza-León]]></surname>
<given-names><![CDATA[Carlos Vicente]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Flores]]></surname>
<given-names><![CDATA[Cecilia Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arzate-Cárdenas]]></surname>
<given-names><![CDATA[Mario Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubio-Franchini]]></surname>
<given-names><![CDATA[Isidoro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rico-Martínez]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigaciones en Óptica, A.C. Laboratorio de Química Solar ]]></institution>
<addr-line><![CDATA[Aguascalientes Ags.]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Benemérita Universidad Autónoma de Aguascalientes Centro de Ciencias Básicas Departamento de Química]]></institution>
<addr-line><![CDATA[Aguascalientes Ags.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Benemérita Universidad Autónoma de Aguascalientes  ]]></institution>
<addr-line><![CDATA[Aguascalientes Ags]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto de Salud del Estado de Aguascalientes Laboratorio Estatal de Salud Pública ]]></institution>
<addr-line><![CDATA[Aguascalientes Ags.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>33</volume>
<numero>3</numero>
<fpage>329</fpage>
<lpage>338</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972023000300329&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972023000300329&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972023000300329&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Background: While naturally occurring, heavy metals such as chromium, lead, and mercury also reach aquatic environments via anthropogenic activities, sometimes at alarming concentrations thereby altering the dynamics of the communities. Chromium, which is present in the discharge from automotive and tannery industries, occurs in two stable forms: trivalent (Cr III) and hexavalent (Cr VI). Because these forms differ in their chemical properties, their bioavailability differs and, as a result, so does their effects on organisms.  Goals:  The aim of our study was to assess effects of both Cr III and Cr VI on the rotifer Lecane papuana (Murray, 1913) by determining how these forms affect the demographic parameters of survival (lx ) and fecundity (mx ).  Methods:  we performed 48-h acute and 5-d chronic toxicity tests on both forms of chromium. In addition, we determined the bioconcentration factor and metal body burden after 24-h exposure to Cr III and Cr VI. According to their respective LC50 values our results indicate that Cr III was less toxic than Cr VI (Cr III = 2.613 mg/L; Cr VI = 0.177 mg/L).  Results:  Intrinsic growth rate was significantly affected by Cr III, while Cr VI caused no significant changes, but only at 0.0885 mg/L, a concentration representing 0.5 times of its LC50 value. Although Cr III was not as toxic as Cr VI, our bioconcentration experiments demonstrated that L. papuana accumulated more Cr III than Cr VI and did so at concentrations of environmental concern.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Antecedentes:  Si bien, los metales pesados como el cromo, el plomo y el mercurio se encuentran de forma natural, también llegan a los ambientes acuáticos a través de actividades antropogénicas, a veces en concentraciones alarmantes, alterando así la dinámica de las comunidades. El cromo, que está presente en los vertidos de las industrias automotrices y curtiduría, se presenta en dos formas estables: trivalente (Cr III) y hexavalente (Cr VI). Debido a que éstas formas difieren en sus propiedades químicas, su biodisponibilidad es distinta, y como resultado, también los efectos sobre los organismos.  Objetivos:  El objetivo de nuestro estudio fue evaluar los efectos de Cr III y Cr VI en el rotífero Lecane papuana (Murray, 1913) determinando cómo estas formas afectan los parámetros demográficos de supervivencia (lx ) y fecundidad (mx ).  Métodos:  Realizamos pruebas de toxicidad aguda de 48-h y crónicas de 5-d en ambas formas de cromo. Además, se obtuvo el factor de bioconcentración y la carga corporal de metal después de 24 h de exposición a Cr III y Cr VI.  Resultados:  Respecto a los valores de CL50, nuestros resultados indican que Cr III fue menos tóxico que Cr VI (Cr III = 2.613 mg/L; Cr VI = 0.177 mg/L). La tasa intrínseca de crecimiento se vio significativamente afectada por Cr III, mientras que Cr VI no mostró cambios significativos, solo a 0.0885 mg/L cuya concentración representa 0.5X de su CL50. Aunque Cr III no fue tan tóxico como Cr VI, nuestros experimentos de bioconcentración demostraron que L. papuana acumuló más Cr III que Cr VI, y lo hizo en concentraciones ambientales relevantes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[alternative test organisms]]></kwd>
<kwd lng="en"><![CDATA[bioconcentration factor (BCF)]]></kwd>
<kwd lng="en"><![CDATA[intrinsic growth rate]]></kwd>
<kwd lng="en"><![CDATA[lethal median concentration (LC50)]]></kwd>
<kwd lng="en"><![CDATA[metals]]></kwd>
<kwd lng="es"><![CDATA[concentración letal media (CL50)]]></kwd>
<kwd lng="es"><![CDATA[factor de bioconcentración (BCF)]]></kwd>
<kwd lng="es"><![CDATA[metales]]></kwd>
<kwd lng="es"><![CDATA[organismos de prueba alternativos]]></kwd>
<kwd lng="es"><![CDATA[tasa intrínseca de crecimiento]]></kwd>
</kwd-group>
</article-meta>
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