<?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>0304-3584</journal-id>
<journal-title><![CDATA[Actualidades Biológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Actu Biol]]></abbrev-journal-title>
<issn>0304-3584</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Biología, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0304-35842009000100005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[CARACTERÍSTICAS BIOLÓGICAS DEL BLANQUILLO SORUBIM CUSPICAUDUS LITTMANN, BURR Y NASS, 2000 Y BAGRE RAYADO PSEUDOPLATYSTOMA MAGDALENIATUM BUITRAGO-SUÁREZ Y BURR, 2007 (SILURIFORMES: PIMELODIDAE) RELACIONADAS CON SU REPRODUCCIÓN EN LA CUENCA MEDIA DEL RÍO MAGDALENA, COLOMBIA]]></article-title>
<article-title xml:lang="en"><![CDATA[BIOLOGIC CHARACTERISTICS OF BLANQUILLO SORUBIM CUSPICAUDUS LITTMANN, BURR Y NASS, 2000 AND BAGRE RAYADO PSEUDOPLATYSTOMA MAGDALENIATUM BUITRAGO-SUÁREZ Y BURR, 2007 (SILURIFORMES: PIMELODIDAE) RELATED TO THEIR REPRODUCTION IN THE MIDDLE BASIN OF THE MAGDALENA RIVER, COLOMBIA]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez Segura]]></surname>
<given-names><![CDATA[Luz F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palacio]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Instituto de Biología ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Antioquia Ingeniería Sanitaria ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Militar Nueva Granada Departamento de Ecología ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2009</year>
</pub-date>
<volume>31</volume>
<numero>90</numero>
<fpage>53</fpage>
<lpage>66</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0304-35842009000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0304-35842009000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0304-35842009000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Algunas características biológicas de Pseudoplatystoma magdaleniatum y de Sorubim cuspicaudus fueron monitoreadas durante los años 2004 y 2005 en la cuenca media del río Magdalena y, analizamos si estas se encuentran sincronizadas con la densidad de larvas de estas dos especies derivando en el río Magdalena. Para esto se utilizó la información de 1.245 individuos adultos de P. magdaleniatum y 1.206 de S. cuspicaudus y la densidad de sus larvas en muestras de agua del río Magdalena. S. cuspicaudus se reproduce durante el periodo de ''aguas bajas'' mientras que P. magdaleniatum lo hace durante el periodo de ''aguas subiendo''. Las hembras de las dos especies fueron siempre de mayor tamaño que los machos, la relación longitud-peso fue alométrica y solo en el caso de P. magdaleniatum las características biológicas estuvieron sincronizadas con la densidad de larvas durante el periodo de observación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Some biological characteristics of Pseudoplatystoma magdaleniatum and Sorubim cuspicaudus were monitored during years 2004 and 2005 in the middle basin of the Magdalena river, and we analyzed if they were synchronized with their larvae densities drifting in the Magdalena river. We use data from 1245 adults of P. magdaleniatum and 1206 of S. cuspicaudus and larvae densities from water samples of the Magdalena river. S. cuspicaudus reproduces in the ''low water'' hydro-period and P. magdaleniatum does during ''high water'' hydro-period. Females were always bigger than males. Lenght-weigth relationship was allometric and only the biologic characteristics of adults of P. magdaleniatum were associated with their larvae densities.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[larvas]]></kwd>
<kwd lng="es"><![CDATA[Pimelodidae]]></kwd>
<kwd lng="es"><![CDATA[reproducción]]></kwd>
<kwd lng="es"><![CDATA[río Magdalena]]></kwd>
<kwd lng="en"><![CDATA[Pimelodidae]]></kwd>
<kwd lng="en"><![CDATA[reproduction]]></kwd>
<kwd lng="en"><![CDATA[fish larvae]]></kwd>
<kwd lng="en"><![CDATA[Magdalena river]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  ]]></body><back>
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