<?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>S0188-88972015000300375</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Productividad primaria marina dominada por diatomeas en el Pacífico nororiental mexicano durante el último milenio]]></article-title>
<article-title xml:lang="en"><![CDATA[Diatom dominated marine primary productivity in the Mexican Northeastern Pacific during the last millennium]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Juárez]]></surname>
<given-names><![CDATA[Miryam]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Yajimovich]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cota-Meza]]></surname>
<given-names><![CDATA[María Soledad]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ricaurte-Villota]]></surname>
<given-names><![CDATA[Constanza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Ciencias Marinas ]]></institution>
<addr-line><![CDATA[La Paz B.C.S.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Baja California Facultad de Ciencias Marinas ]]></institution>
<addr-line><![CDATA[Ensenada B.C]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Investigaciones Marinas y Costeras "José Benito Vives De Andréis"  ]]></institution>
<addr-line><![CDATA[ Santa Marta]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>25</volume>
<numero>3</numero>
<fpage>375</fpage>
<lpage>381</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972015000300375&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972015000300375&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972015000300375&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Las diatomeas, el principal grupo del plancton silíceo, contribuyen con más del 40% de la producción primaria marina y dominan las comunidades del plancton en el Océano del Sur, Pacífico Norte y regiones de surgencias del Pacífico tropical y ecuatorial. La razón Si (OH)4/NO3- &gt;1.0 en aguas subsuperficiales del margen suroccidental de Baja California (MSO-BC), sugiere que las diatomeas crecen en condiciones óptimas de nutrientes y alcanzan valor Si (OH)4/NO3 &lt;3 en condiciones cercanas al límite por deficiencia de Fe o P. Estos valores son más altos que la razón Si:N &lt;1 para muchos de los océanos. Por lo tanto, si la productividad primaria es dominada por diatomeas en el último milenio, la razón Si:N deberá ser &lt;3. Para dar respuesta a esta pregunta, se colectó un multinúcleo a 700 m de profundidad en el MSO-BC. Las muestras seccionadas cada centímetro fueron liofilizadas y homogenizadas para cuantificar el contenido de ópalo biogénico (OB) y nitrógeno total (NT), a partir de los cuales se calculó la razón Si:N y el fósforo orgánico. El contenido de OB y NT se incrementó de manera constante y la razón Si:N tuvo un promedio y desviación estándar de 2.8±0.1, mientras que el Porg 1.1±0.9 mg kg-1. Los resultados sugieren que en el último milenio, la productividad primaria ha estado dominada por diatomeas producto del ácido silícico exportado del Golfo de California hacia el margen de Magdalena, hipótesis que tiene que ser validada, bajo un océano limitado por Fe, y no por nitratos y ortofosfatos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Diatoms, the main group of siliceous plankton, contribute more than 40% of the marine primary productivity and dominate the plankton communities of the Southern Ocean, north Pacific and the upwelling regions of the equatorial and tropical Pacific. The Si (OH)4/NO3- &gt;1.0 ratio in subsurface waters of the southwestern margin of Baja California (SWM-BC) suggests that diatoms grow in optimum nutrient conditions and reach a value of Si (OH)4/NO3 &lt;3 in conditions near the limit because of Fe or P deficiency. These values are higher than the Si:N &lt;1 ratio for many oceans, therefore if primary productivity is diatom dominated in the last millennium, the Si:N ratio must be &lt;3. To answer this question, a multicore was recovered from a depth of 700 meters in the SWM-BC. The core was sampled every 1 cm and freze-dried to obtain the biogenic opal content (BO) and total nitrogen (TN), from which the Si:N ratio and organic phosphorus were calculated. The BO and TN content increased in a constant manner and the Si:N ratio had an average and standard deviation of 2.8±0.1 and Porg had an average and standard deviation of 1.1±0.9 mg kg-1. In the last millennium, primary productivity has been diatom dominated, a product of the silicic acid exported from the Gulf of California to the Magdalena margin, hypothesis that has to be validated, under a Fe-limited ocean, and not by nitrates and orthophosphates.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Diatomeas]]></kwd>
<kwd lng="es"><![CDATA[margen de Magdalena]]></kwd>
<kwd lng="es"><![CDATA[ópalo biogénico]]></kwd>
<kwd lng="es"><![CDATA[productividad primaria]]></kwd>
<kwd lng="es"><![CDATA[razón Si:N.]]></kwd>
<kwd lng="en"><![CDATA[Diatoms]]></kwd>
<kwd lng="en"><![CDATA[Magdalena margin]]></kwd>
<kwd lng="en"><![CDATA[biogenic opal]]></kwd>
<kwd lng="en"><![CDATA[primary productivity]]></kwd>
<kwd lng="en"><![CDATA[Si:N ratio]]></kwd>
</kwd-group>
</article-meta>
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