<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442017000300881</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v65i3.26371</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Reproduction of Megapitaria squalida (Bivalvia: Veneridae) in the Southeast Gulf of California, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Reproducción de la almeja callista Megapitaria squalida (Bivalvia: Veneridae) en el sureste del Golfo de California, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Dagnino]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santamaría-Miranda]]></surname>
<given-names><![CDATA[Apolinar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Ulloa]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Góngora-Gómez]]></surname>
<given-names><![CDATA[Andrés M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Investigación para el Desarrollo Integral Regiona Departamento de Acuacultura]]></institution>
<addr-line><![CDATA[Guasave Sinaloa]]></addr-line>
<country>MX</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<volume>65</volume>
<numero>3</numero>
<fpage>881</fpage>
<lpage>889</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442017000300881&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442017000300881&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442017000300881&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractBivalves reproductive cycle varies according to the particular environmental conditions where they are found, and these reproductive details represent basic information for their capture, management and conservation strategies. With this objective, the reproductive cycle of the clam Megapitaria squalida, inhabiting the Southeast of the Gulf of California (Altata Bay, Sinaloa, Mexico), was studied using histology and changes in the number and size of oocytes, from June 2013 to June 2014. Histological analysis of the gonads showed spawning activity throughout the year, with two peaks. The first was registered in October and it was accompanied by the highest decrease of weight; the second was in February with the highest percentage of spawning population; besides, a resting period was observed in December. The sex-ratio (female:male) of the clam population was 1.08:1 (&#967;2 = 5.72, d.f. = 1, P &lt; 0.05). Mean oocyte size and number were different (P &lt; 0.05) among all sampling months and fluctuated from 34.6 ± 5.8 µm in June 2014, to 41.9 ± 6.8 µm in February 2014, and from 443.8 ± 424.5 in February 2014, to 1 214.4 ± 267.6 counted in April, respectively. With these results we suggest a protection season from October to November, when the most intense release of gametes occur in this population. Rev. Biol. Trop. 65 (3): 881-889. Epub 2017 September 01.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenEl ciclo reproductivo de los bivalvos varía de acuerdo a las condiciones ambientales de cada lugar, y representa información importante para su conservación. Se estudió el ciclo reproductivo de la almeja Megapitaria squalida utilizando cortes histológicos de la gónada y cambios en el número y tamaño de los oocitos, en el sur del Golfo de California (Bahía Altata, Sinaloa, México), desde junio 2013 a junio 2014. El análisis histológico de las gónadas, mostró eventos de desove todo el año con dos picos: el primero fue registrado en octubre acompañado con un fuerte decremento en peso de los animales; el segundo en febrero caracterizado por un alto porcentaje de desove en la población. Se observó un periodo de reposo en diciembre. La proporción sexual (hembras:machos) de la población de almejas fue 1.08:1 (&#967;2 = 5.72, g.l. = 1, P &lt; 0.05). El número y tamaño promedio de los oocitos mostró diferencias (P &lt; 0.05) entre los muestreos mensuales, y fluctuaron de 34.6 ± 5.8 µm en junio 2014 a 41.9 ± 6.8 µm en febrero 2014, y de 443.8 ± 424.5 en febrero 2014, a 1 214.4 ± 267.6 en abril 2014. Se propone una temporada de veda desde octubre a noviembre, ya que en estos meses la liberación de gametos por la población fue más intensa.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[gonadic index]]></kwd>
<kwd lng="en"><![CDATA[Megapitaria squalida]]></kwd>
<kwd lng="en"><![CDATA[oocyte development]]></kwd>
<kwd lng="en"><![CDATA[spawning season]]></kwd>
<kwd lng="en"><![CDATA[capture man-agement]]></kwd>
<kwd lng="en"><![CDATA[conservation]]></kwd>
<kwd lng="es"><![CDATA[índice gonádico]]></kwd>
<kwd lng="es"><![CDATA[Megapitaria squalida]]></kwd>
<kwd lng="es"><![CDATA[desarrollo de oocitos]]></kwd>
<kwd lng="es"><![CDATA[época de desove]]></kwd>
<kwd lng="es"><![CDATA[manejo de captura]]></kwd>
<kwd lng="es"><![CDATA[conservación]]></kwd>
</kwd-group>
</article-meta>
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