<?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>S0188-88972019000100009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Relation between the sharpnose shark Rhizoprinodon terranovae in the southern Gulf of Mexico and the average number of sunspots]]></article-title>
<article-title xml:lang="es"><![CDATA[Relación entre capturas del tiburón Rhizoprionodon terraenovae al sur del Golfo de México y el número de manchas solares]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Santillán]]></surname>
<given-names><![CDATA[Norma]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esquivel-Herrera]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aldeco-Ramírez]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Metropolitana Departamento El Hombre y su Ambiente ]]></institution>
<addr-line><![CDATA[Xochimilco Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>29</volume>
<numero>1</numero>
<fpage>9</fpage>
<lpage>16</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972019000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972019000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972019000100009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Background:  The Antillean or sharpnose shark is one of the main exemplars of shark species in the commercial catch in the southern Gulf of Mexico. Oceanic dynamics on the planet Earth vary year to year due to the oscillation of solar radiation; fish abundance (and catches) likely respond to these oscillations.  Goals:  This study focuses on analyzing the variability of landings of the Antillean sharpnose shark (Rhizoprionodon terraenovae) on the Mexican coast of the Gulf of Mexico, from 1940 to 2006, and its possible connection with solar activity as assessed by the average sunspot number (Zürich Index).  Methods:  A polynomial curve by least-squares best fitting was used to eliminate the tendency from the sharpnose-shark-landing time series. Spectral techniques of Maximum Entropy (ME) and Fast Fourier Transform (FFT) were used to analyze the time series of sharpnose-shark landings and the Zürich Index.  Results:  The time series of sharpnose-shark landings showed a remarkable spectral peak with a period of about 12.8 years, while the Zürich Index showed a marked peak at a period of 11.6 years. Cross-correlation revealed a delay between the average number of solar spots and sharpnose-shark landings.  Conclusions:  This study is the first to report such low frequency variability for landings of the R. terraenovae fishery in the Gulf of Mexico, using a particular methodology that can provide information for the design of predictive models in the future. The analyzed landing volumes of the sharpnose shark R. terraenovae showed as a result a periodical behavior that coincided with Wolf&#8217;s solar activity cycle of 10.6 years.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Antecedentes:  El cazón antillano o tiburón picudo, es uno de los ejemplares principales de las especies de tiburón en la captura comercial en el sur del Golfo de México. La dinámica oceánica en el planeta tierra varía de forma interanual debido a la oscilación de la radiación solar; las abundancias (y capturas) de peces responden a estas oscilaciones.  Objetivos:  Analizar la variabilidad de las capturas del cazón antillano Rhizoprionodon terraenovae en el litoral mexicano del Golfo de México, de 1940 a 2006 y su posible relación con la actividad solar, evaluada mediante el número promedio de manchas solares (Índice de Zürich).  Métodos:  Se empleó el polinomio de mejor ajuste por mínimos cuadrados para eliminar la tendencia de la serie temporal de las capturas; y se utilizaron las técnicas espectrales de la Transformada Rápida de Fourier (FFT) y de Máxima Entropía (ME) para analizar las series temporales de las capturas de cazón y del índice de Zürich.  Resultados:  Se muestra un pico espectral distintivo en la serie de capturas con una frecuencia de alrededor de 12.8 años, en tanto que el índice de Zürich muestra un pico marcado a los 11.6 años. La correlación cruzada reveló un retraso entre el número promedio de manchas solares y las capturas de tiburón.  Conclusiones:  Este trabajo es el primero en reportar una frecuencia tan baja en la variabilidad de las capturas de la pesquería de R. terraenovae del Golfo de México, empleando una metodología particular que puede proporcionar información para el diseño de modelos predictivos en el futuro. Los volúmenes de captura analizados del cazón antillano R. terraenovae mostraron como resultado un comportamiento periódico en coincidencia con el ciclo de actividad solar de Wolf de 10.6 años.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Antillean sharpnose-shark landings]]></kwd>
<kwd lng="en"><![CDATA[Fast Fourier Transform and Maximum Entropy]]></kwd>
<kwd lng="en"><![CDATA[Gulf of Mexico]]></kwd>
<kwd lng="en"><![CDATA[solar activity]]></kwd>
<kwd lng="en"><![CDATA[time series]]></kwd>
<kwd lng="es"><![CDATA[Actividad solar]]></kwd>
<kwd lng="es"><![CDATA[captura del cazón antillano]]></kwd>
<kwd lng="es"><![CDATA[Golfo de México]]></kwd>
<kwd lng="es"><![CDATA[series de tiempo]]></kwd>
<kwd lng="es"><![CDATA[Transformada Rápida de Fourier y Máxima Entropía]]></kwd>
</kwd-group>
</article-meta>
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