<?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>0121-1935</journal-id>
<journal-title><![CDATA[Revista de Ciencias]]></journal-title>
<abbrev-journal-title><![CDATA[rev. cienc.]]></abbrev-journal-title>
<issn>0121-1935</issn>
<publisher>
<publisher-name><![CDATA[Universidad del Valle]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-19352014000200001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Impacto alimentario de los copépodos calanoideos en el Océano Pacífico colombiano]]></article-title>
<article-title xml:lang="en"><![CDATA[Grazing Impact of Calanoid Copepods in the Colombian Pacific Ocean]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Giraldo]]></surname>
<given-names><![CDATA[Alan]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velasco]]></surname>
<given-names><![CDATA[Eliana]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[Tulia Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Valle  ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Concepción  ]]></institution>
<addr-line><![CDATA[Concepción ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Sao Paulo  ]]></institution>
<addr-line><![CDATA[São Paulo ]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2014</year>
</pub-date>
<volume>18</volume>
<numero>2</numero>
<fpage>11</fpage>
<lpage>25</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-19352014000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-19352014000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-19352014000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Grazing rate of copepods was evaluated in the oceanic province of the Colombian Pacific during September 2006. Gut pigment content was estimated by spectophotometry considering three size fraction: small (300-500 &mu;m), medium (500-1000 &mu;m) and big (> 1000 &mu;m). In order to estimate the ingestion rate, an experimental gut evacuation rate of 0.702 h-1 was used. Feeding impact was calculated like a proportion of phytoplankton standing stock, projecting the total copepod consumption by size in relation to chlorophyll-a concentration in each station. Small copepods were most abundant than medium or big copepods (Kruskal-Wallis H=21.83; p=0.01). Although the ingestion rate of big copepods was higher than medium or small copepods (Kruskal-Wallis H=6.48; p= 0.04), no significant differences in the consumption rate were detected among sizes (Kruskal-Wallis H=3.07; p=0.21). The chlorophyll-a integrate (0-50m) in the study zone was between 4.4 and 9.5 mg Clo-a m-2, being estimated the grazing impact of the big copepod in 2.57 ± 0.80 %, medium 3.57 ± 1.89 % and small 12.06 ± 5.99%]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se determinó el impacto alimentario de los copépodos en nueve estaciones localizadas en la Cuenca Pacífica Colombiana durante septiembre de 2006. El contenido de pigmentos entéricos, fue medido espectrofotométricamente en tres fracciones de tamaño: pequeño (300-500 &mu;m), mediano (500-1000 &mu;m) y grande (> 1000 &mu;m); y se estimó la tasa de consumo considerando una tasa de evacuación de 0.702 h-1 que fue establecida previamente de manera experimental. Considerando la abundancia de cada fracción y la concentración de clorofila-a en cada estación, se cuantificó el impacto alimentario como un porcentaje de la biomasa fitoplanctónica disponible. Los copépodos de menor tamaño fueron significativamente más abundantes en la zona de estudio (Kruskal-Wallis H=21.83; p=0.01). Aunque la tasa de ingestión de los copépodos grandes fue significativamente mayor (Kruskal-Wallis H=6.48; p= 0.04), no se detectaron diferencias significativas entre las tasas de consumo de las tres fracciones de tamaño evaluadas (Kruskal-Wallis H=3.07; p=0.21). La clorofila-a integrada (0-50m) en la zona de estudio estuvo entre 4.4 a 9.5 mg Clo-a m-2, siendo el impacto alimentario promedio de los copépodos grandes de 2.57 ± 0.80 %, medianos 3.57 ± 1.89 % y pequeños 12.06 ± 5.99%]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[grazing]]></kwd>
<kwd lng="en"><![CDATA[ingestion rate]]></kwd>
<kwd lng="en"><![CDATA[chlorophyll]]></kwd>
<kwd lng="en"><![CDATA[copepods]]></kwd>
<kwd lng="en"><![CDATA[Pacific Ocean]]></kwd>
<kwd lng="en"><![CDATA[Colombia]]></kwd>
<kwd lng="es"><![CDATA[forrajeo]]></kwd>
<kwd lng="es"><![CDATA[ingestión]]></kwd>
<kwd lng="es"><![CDATA[clorofila]]></kwd>
<kwd lng="es"><![CDATA[copépodos]]></kwd>
<kwd lng="es"><![CDATA[océano Pacífico]]></kwd>
<kwd lng="es"><![CDATA[Colombia]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font size="2" face="verdana">      <p align="center"><font size="4"><b>Impacto alimentario de los cop&eacute;podos calanoideos en el Oc&eacute;ano Pac&iacute;fico colombiano</b></font></p>      <p align="center"><font size="3"><b>Grazing Impact of Calanoid Copepods in the Colombian Pacific Ocean</b></font></p>        <p><i>Alan Giraldo</i>    <br> Departamento de Biolog&iacute;a. Universidad del Valle, Cali - Colombia    <br> E-mail: <a href="mailto:alan.giraldo@correounivalle.edu.co">alan.giraldo@correounivalle.edu.co</a></p>      <p><i>Eliana Velasco</i>    <br> Departamento de Oceanograf&iacute;a, Universidad de Concepci&oacute;n, Concepci&oacute;n - Chile    <br> E-mail: <a href="mailto:evelasco@udec.cl">evelasco@udec.cl</a></p>      <p><i>Tulia Isabel Mart&iacute;nez</i>    ]]></body>
<body><![CDATA[<br> Departamento de Oceanograf&iacute;a Biol&oacute;gica, Instituto de Oceanograf&iacute;a, Universidad de Sao Paulo, S&atilde;o Paulo - Brasil    <br> E-mail: <a href="mailto:tuismara@usp.br">tuismara@usp.br</a></p>      <p><b>Received:</b> January 3, 2014    <br> <b>Accepted:</b> December 18, 2014</p>  <hr>      <p><font size="3"><b>Abstract</b></font></p>     <p>Grazing rate of copepods was evaluated in the oceanic province of the Colombian Pacific during September 2006. Gut pigment content was estimated by spectophotometry considering three size fraction: small (300-500 &mu;m), medium (500-1000 &mu;m) and big (&gt; 1000 &mu;m). In order to estimate the ingestion rate, an experimental gut evacuation rate of 0.702 h<sup>-1</sup> was used. Feeding impact was calculated like a proportion of phytoplankton standing stock, projecting the total copepod consumption by size in relation to chlorophyll-a concentration in each station. Small copepods were most abundant than medium or big copepods (Kruskal-Wallis H=21.83; p=0.01). Although the ingestion rate of big copepods was higher than medium or small copepods (Kruskal-Wallis H=6.48; p= 0.04), no significant differences in the consumption rate were detected among sizes (Kruskal-Wallis H=3.07; p=0.21). The chlorophyll-a integrate (0-50m) in the study zone was between 4.4 and 9.5 mg Clo-a m<sup>-2</sup>, being estimated the grazing impact of the big copepod in 2.57 	&plusmn; 0.80 %, medium 3.57 	&plusmn; 1.89 % and small 12.06 	&plusmn; 5.99%.</p>     <p><b>Keywords: </b>grazing, ingestion rate, chlorophyll, copepods, Pacific Ocean, Colombia.</p> <hr>     <p><font size="3"><b>Resumen</b></font></p>     <p>Se determin&oacute; el impacto alimentario de los cop&eacute;podos en nueve estaciones localizadas en la Cuenca Pac&iacute;fica Colombiana durante septiembre de 2006. El contenido de pigmentos ent&eacute;ricos, fue medido espectrofotom&eacute;tricamente en tres fracciones de tama&ntilde;o: peque&ntilde;o (300-500 &mu;m), mediano (500-1000 &mu;m) y grande (&gt; 1000 &mu;m); y se estim&oacute; la tasa de consumo considerando una tasa de evacuaci&oacute;n de 0.702 h<sup>-1</sup> que fue establecida previamente de manera experimental. Considerando la abundancia de cada fracci&oacute;n y la concentraci&oacute;n de clorofila-a en cada estaci&oacute;n, se cuantific&oacute; el impacto alimentario como un porcentaje de la biomasa fitoplanct&oacute;nica disponible. Los cop&eacute;podos de menor tama&ntilde;o fueron significativamente m&aacute;s abundantes en la zona de estudio (Kruskal-Wallis H=21.83; p=0.01). Aunque la tasa de ingesti&oacute;n de los cop&eacute;podos grandes fue significativamente mayor (Kruskal-Wallis H=6.48; p= 0.04), no se detectaron diferencias significativas entre las tasas de consumo de las tres fracciones de tama&ntilde;o evaluadas (Kruskal-Wallis H=3.07; p=0.21). La clorofila-a integrada (0&ndash;50m) en la zona de estudio estuvo entre 4.4 a 9.5 mg Clo-a m<sup>-2</sup>, siendo el impacto alimentario promedio de los cop&eacute;podos grandes de 2.57 &plusmn; 0.80 %, medianos 3.57 &plusmn; 1.89 % y peque&ntilde;os 12.06 &plusmn; 5.99%.</p>     <p><b>Palabras clave: </b>forrajeo, ingesti&oacute;n, clorofila, cop&eacute;podos, oc&eacute;ano Pac&iacute;fico, Colombia.</p>  <hr>      ]]></body>
<body><![CDATA[<p><font size="3"><b>1. Introducci&oacute;n</b></font></p>      <p>El fitoplancton constituye el productor primario de la materia org&aacute;nica y la energ&iacute;a de la columna de agua. A partir de estos organismos, el zooplancton e incluso vertebrados superiores, obtienen la energ&iacute;a necesaria para sobrevivir, estructurando la trama tr&oacute;fica marina tradicional (Cifuentes et al., 2000; Friedland et al., 2012). En este escenario, los consumidores primarios que hacen parte del zooplancton se convierten en el enlace directo entre los productores primarios y los consumidores de la parte alta de la trama tr&oacute;fica, por lo que se convierten en un eslab&oacute;n crucial para la transferencia de carbono en el ambiente pel&aacute;gico (Huskin et al., 2001; Mayzaud, 2002; Frederiksen et al., 2006; Benoit-Bird et al., 2012).</p>     <p>En los mares tropicales, los consumidores primarios de la trama tr&oacute;fica pel&aacute;gica lo conforman esencialmente los cop&eacute;podos (Cifuentes et al., 2000; Calbet &amp; Saiz, 2005; McKinnnon &amp; Duggan, 2014). Estos organismos consumen diariamente la mitad de su propio peso, es decir cerca de 120000 diatomeas al d&iacute;a (Gifford &amp; Dagg, 1991; Mauchline, 1998; Boling et al., 2012) y se constituyen en el engranaje de la "bomba biol&oacute;gica" en la columna de agua. Es a trav&eacute;s de este mecanismo que el carbono atmosf&eacute;rico es asimilado por el fitoplancton, mediado por el proceso fotosint&eacute;tico y es transportado activamente por el zooplancton afuera de la zona f&oacute;tica de la columna de agua durante el proceso de migraci&oacute;n vertical (Small et al., 1983; Ducklow et al., 2001, Passow &amp; Carlson, 2012).</p>     <p>En un contexto amplio, un aspecto esencial en la relaci&oacute;n fitoplancton-zooplancton es el pastoreo <i>"grazing" </i>o impacto alimentario. Este impacto es una medida de la presi&oacute;n de consumo que ejerce el zooplancton sobre el fitoplancton, y para su estimaci&oacute;n es necesario conocer la abundancia del zooplancton que consume fitoplancton, la cantidad de material fitoplanct&oacute;nico disponible en el ambiente que se cuantifica con base en la concentraci&oacute;n de clorofila-a, y las tasas de ingestiones espec&iacute;ficas (Morales et al., 1993; Nejstgaard et al., 2007; Saiz &amp; Calbet, 2011; Symons et al., 2012).</p>     <p>Aunque los cop&eacute;podos no se alimentan exclusivamente de fitoplancton, junto con las salpas y los eufa&uacute;sidos, son considerados los organismos planct&oacute;nicos que mayor impacto alimentario ejercen sobre el fitoplancton en el ambiente pel&aacute;gico (Mauchline, 1998). Sin embargo, sus tasas de ingesti&oacute;n generalmente se relacionan con el tama&ntilde;o del organismos, por lo que los trabajos de impacto alimentario en funci&oacute;n del espectro de tama&ntilde;o presenta ventajas comparativas sobre estudios a nivel de especie (Dam et al., 1993), toda vez que las diferentes fracciones de tama&ntilde;o se alimentan de tama&ntilde;os espec&iacute;ficos de organismos fitoplanct&oacute;nicos (Landry &amp; Hassett, 1982; Sprules &amp; Munawar 1986, Landry et al., 1994; Bautista &amp; Harris, 1992; Hern&aacute;ndez-Trujillo et al., 2007).</p>     <p>Tradicionalmente, se ha utilizado la fluorescencia intestinal (Mackas &amp; Bohrer, 1976) como m&eacute;todo indirecto para realizar la estimaci&oacute;n de las tasas de ingesti&oacute;n in <i>situ </i>en diferentes especies de cop&eacute;podos (Morales et al., 1990; Sautor et al., 2000; Tseng et al., 2008; Li et. al., 2013, Isla et al., 2015). Este m&eacute;todo cuantifica la tasa de ingesti&oacute;n, a partir de la tasa de evacuaci&oacute;n (k) y el contenido de pigmentos ent&eacute;ricos (G) en los individuos. Si se asume que las tasas de ingesti&oacute;n son similares en los individuos que tienen similar tama&ntilde;o y se encuentran bajo condiciones ambientales similares(Morales et al.,1990; Bautista &amp; Harris, 1992), entonces a partir de esta informaci&oacute;n y el estimado de abundancia del zooplancton herb&iacute;voro de una localidad se puede establecer el impacto alimentario total (Dagg, 1995; Tan et al., 2004, Hern&aacute;ndez-Trujillo et al., 2007; Lee et al., 2012). En el presente trabajo se cuantifica el impacto alimentario que ejercen los cop&eacute;podos sobre el fitoplancton en el Oc&eacute;ano Pac&iacute;fico colombiano, considerando el aporte proporcional de tres fracciones de tama&ntilde;o, gener&aacute;ndose informaci&oacute;n novedosa sobre uno de los procesos oceanogr&aacute;ficos menos estudiados en esta regi&oacute;n.</p>      <p><font size="3"><b>Materiales y m&eacute;todos</b></font></p>      <p>Se seleccionaron nueve estaciones oce&aacute;nicas durante la campa&ntilde;a oceanogr&aacute;fica Pac&iacute;fico XLIII, realizada en septiembre de 2006 a bordo de BO ARC Providencia (<a href="#fig1">Figura 1</a>) para realizar el muestreo biol&oacute;gico. En cada estaci&oacute;n se cuantific&oacute; la concentraci&oacute;n de clorofila disponible en la columna de agua, mediante colectas discretas de agua a profundidades est&aacute;ndar (0, 10, 30, 50 y 75 m) utilizando una botella Niskin. De cada profundidad se filtr&oacute; una submuestra de 1 L de agua a trav&eacute;s de filtros GF/F y se congel&oacute; en nitr&oacute;geno l&iacute;quido (-70&deg;C) para transportarla al laboratorio, y realizar el procedimiento est&aacute;ndar de extracci&oacute;n en acetona al 90% por 24 h y la correspondiente cuantificaci&oacute;n de la concentraci&oacute;n de clorofila-a por espectofotometr&iacute;a (Yentsch &amp; Menzel, 1963; Holm-Hansen et al., 1965).</p>      <p align="center">Figura 1. &Aacute;rea de estudio y ubicaci&oacute;n de las estaciones en donde se realizaron las capturas de zooplancton durante la campa&ntilde;a oceanogr&aacute;fica Pac&iacute;fico XLIII-ERFEN XLII en septiembre 2006 a bordo del B.O. ARC Providencia</p>      <p align="center"><a name="fig1"><img src="img/revistas/rcien/v18n2/v18n2a01-fig01.jpg"></a></p>      ]]></body>
<body><![CDATA[<p>Adicionalmente, en cada estaci&oacute;n se realizaron arrastres oblicuos de zooplancton desde 50m a superficie utilizando una red bongo de 30 cm boca y 300 &micro;m de poro de malla, provista de un fluj&oacute;metro digital General Oceanic para cuantificar el volumen de agua filtrado. La muestra de uno de los copos de la red fue preservada en formol buferizado al 4% para estimar la abundancia de los cop&eacute;podos estandarizada por m3 y la muestra del segundo copo fue concentrada por filtraci&oacute;n, guardando el material en sobres de papel aluminio y congelada en nitr&oacute;geno l&iacute;quido (-70&deg;C) para realizar la cuantificaci&oacute;n de pigmentos ent&eacute;ricos en el laboratorio.</p>     <p>La cuantificaci&oacute;n de la concentraci&oacute;n de pigmentos ent&eacute;ricos (G) se realiz&oacute; por espectrofotometr&iacute;a despu&eacute;s de 24 h de extracci&oacute;n en acetona al 90%, siguiendo el procedimiento est&aacute;ndar descrito por Mackas &amp; Bohrer (1976) con las modificaciones propuestas por Morales et al., (1990). Los an&aacute;lisis fueron realizados considerando tres fracciones de tama&ntilde;o: &gt; 1000 &micro;m (grandes), 500-1000 &micro;m (medianos) y 300-500 &micro;m (peque&ntilde;os). Dependiendo del tama&ntilde;o se seleccionaron entre 10 a 100 cop&eacute;podos calanoideos bajo un estereoscopio con luz atenuada. Los organismos seleccionados se colocaron en tubos de ensayo con 10 mL de acetona al 90%. Generalmente los pigmentos son extra&iacute;dos completamente despu&eacute;s de 2 h (Huntley et al., 1987), sin embargo para el desarrollo de este trabajo se siguieron las recomendaciones de B&aring;mstedt et al. (2000) dejando extraer los pigmentos por un per&iacute;odo no menor a 12 h, a baja temperatura (4 0C) y en la oscuridad para evitar la fotodegradaci&oacute;n. Al finalizar el per&iacute;odo de extracci&oacute;n se midieron las concentraciones de clorofila-a (Clo-a) y feopigmentos (Feo), mediante la estimaci&oacute;n de la absorbancia del extracto a diferentes longitudes de onda antes y despu&eacute;s de la acidificaci&oacute;n con HCl (10% v/v) en un espectrofot&oacute;metro G&eacute;nesis 20 como:</p>  <img src="img/revistas/rcien/v18n2/v18n2a01-ec01.jpg">       <p>Donde 665a es la absorbancia antes de la acidificaci&oacute;n, 665d es la absorbancia despu&eacute;s de la acidificaci&oacute;n, v es el volumen de acetona utilizado para la extracci&oacute;n en ml, N es el n&uacute;mero de individuos utilizados en la extracci&oacute;n y L es el recorrido del camino &oacute;ptico de la cubeta en cm, expres&aacute;ndose el contenido total de pigmentos ent&eacute;ricos (G) en &micro;g Clo-a ind-1 (B&aring;mstedt et al., 2000).</p>     <p>Para estimar la tasa de ingesti&oacute;n (I) se utiliz&oacute; la aproximaci&oacute;n propuesta por Dagg &amp; Wyman (1983), a partir de la tasa de evacuaci&oacute;n y el contenido de pigmentos ent&eacute;ricos previamente estimados como: I = k * G, donde I es la tasa de ingesti&oacute;n en t&eacute;rminos de clorofila-a (&micro;g Clo-a ind-1 tiempo-1), G es el contenido total de pigmentos ent&eacute;ricos (&micro;g Clo-a ind-1) y k es la tasa de evacuaci&oacute;n (unidades de tiempo-1). Se utiliz&oacute; una tasa de evacuaci&oacute;n de 0.702 h-1, la cual fue estimada experimentalmente a partir del decaimiento temporal del contenido de pigmentos estomacales en cop&eacute;podos calanoideos del ambiente pel&aacute;gico de isla Gorgona por Velasco (2009), ya que de acuerdo con Dam &amp; Peterson (1988) la tasa de evacuaci&oacute;n es dependiente de las condiciones locales de temperatura.</p>     <p>Para establecer la tasa de consumo por fracci&oacute;n de tama&ntilde;o se utiliz&oacute; la tasa de ingesti&oacute;n, y la abundancia estandarizada por volumen de agua filtrada de los cop&eacute;podos calanoideos presentes en cada una de las fracciones de tama&ntilde;o, como: C = I * A, donde C es la tasa de consumo (&micro;g Clo-a m-3 tiempo-1), I es la tasa de ingesti&oacute;n (&micro;g Clo-a ind-1 tiempo-1) y A es la abundancia (ind m-3). Considerando que la zona de estudio corresponde a un ambiente ecuatorial, se asumi&oacute; un tiempo de integraci&oacute;n para las tasas de ingesti&oacute;n y de consumo de 12 h, respectivamente. Se defini&oacute; el pastoreo o impacto alimentario como el porcentaje equivalente de clorofila-a disponible en la columna de agua, que es canalizada a trav&eacute;s de los cop&eacute;podos considerando las tres fracciones de tama&ntilde;o.</p>      <p><font size="3"><b>3. Resultados</b></font></p>      <p>La concentraci&oacute;n promedio superficial de la clorofila-a en la zona de estudio fue 0.25 &plusmn; 0.04 mg Clo-a m-3, detect&aacute;ndose un m&aacute;ximo subsuperficial (0.52 &plusmn; 0.09 mg Clo-a m-3) a 50m de profundidad (<a href="#fig2">Figura 2</a>). Al evaluar la variabilidad espacial en la secci&oacute;n de la columna de agua en donde se realizaron las capturas de zooplancton (0 - 50 m), se detect&oacute; la presencia de agua con baja concentraci&oacute;n en el sector suroccidental de la zona de estudio (&lt; 5.0 mg Clo-a m-2), registr&aacute;ndose adem&aacute;s una tendencia de incremento en direcci&oacute;n al continente (<a href="#fig3">Figura. 3</a>).</p>      <p align="center">Figura 2. Variaci&oacute;n vertical de la clorofila-a en el ambiente oce&aacute;nico del Pac&iacute;fico colombiano durante septiembre 2006</p>      <p align="center"><a name="fig2"><img src="img/revistas/rcien/v18n2/v18n2a01-fig02.jpg"></a></p>      <p align="center">Figura 3. Variaci&oacute;n horizontal de la clorofila-a integrada entre 0 - 50 m de profundidad en el ambiente oce&aacute;nico del Pac&iacute;fico Colombiano durante septiembre 2006</p>      ]]></body>
<body><![CDATA[<p align="center"><a name="fig3"><img src="img/revistas/rcien/v18n2/v18n2a01-fig03.jpg"></a></p>      <p>La abundancia total de cop&eacute;podos calanoideos fue altamente variable en la zona de estudio, con una valor medio de 189.10 &plusmn; 49.96 ind m-3 (<a href="#fig4">Figura 4</a>). Al considerar las fracciones de tama&ntilde;o, se encontr&oacute; que la abundancia de los cop&eacute;podos herb&iacute;voros fue inversamente proporcional a la clase de tama&ntilde;o en todas las estaciones de muestreo, de tal manera que la fracci&oacute;n correspondiente a los cop&eacute;podos peque&ntilde;os fue significativamente m&aacute;s abundante (Kruskal-Wallis H=21.83; p&lt;0.001).</p>     <p align="center">Figura 4. Abundancia, tasas de ingesti&oacute;n, tasas de consumo y pastoreo de los cop&eacute;podos en el ambiente oce&aacute;nico del Pac&iacute;fico colombiano durante septiembre 2006, considerando 3 fracciones de tama&ntilde;o</p>      <p align="center"><a name="fig4"><img src="img/revistas/rcien/v18n2/v18n2a01-fig04jpg.jpg"></a></p>      <p>Las tasas de ingesti&oacute;n tambi&eacute;n fueron altamente variables en la zona de estudio, oscilando entre 0.003 - 0.353 &micro;g Clo-a ind-1 d-1.; sin embargo, la tasa de ingesti&oacute;n fue directamente proporcional al tama&ntilde;o, siendo significativamente mayor en cop&eacute;podos grandes (Kruskal-Wallis H = 6.48; p = 0.04) (<a href="#tab1">Tabla 1</a>). No se encontr&oacute; una asociaci&oacute;n significativa entre la tasa de ingesti&oacute;n y la Clo-a integrada en la zona de estudio (Spearman rs = 0.33, p = 0.35, n=9), indicando que no hubo una respuesta funcional de parte de los cop&eacute;podos asociada con la disponibilidad de alimento en la columna de agua.</p>     <p align="center">Tabla 1. Registro promedio (&plusmn;ES, n=9) de la abundancia, ingesti&oacute;n, consumo e impacto alimentario de los cop&eacute;podos en el Pac&iacute;fico colombiano</p>      <p align="center"><a name="tab1"><img src="img/revistas/rcien/v18n2/v18n2a01-tab01.jpg"></a></p>      <p>Aunque en t&eacute;rminos generales la tasa total de consumo, por parte de los cop&eacute;podos calanoideos, en la zona de estudio fueron homog&eacute;neas, se estableci&oacute; una relaci&oacute;n inversa con el tama&ntilde;o, siendo la fracci&oacute;n m&aacute;s peque&ntilde;a la que present&oacute; la mayor tasa de consumo (<a href="#tab1">Tabla 1</a>, <a href="#fig4">Figura 4</a>). Esta fracci&oacute;n tambi&eacute;n fue la que present&oacute; mayor abundancia en la zona de estudio, por lo que tambi&eacute;n fue la que ejerci&oacute; una mayor presi&oacute;n de herbivor&iacute;a (Tabla 1). Sin embargo, no se registraron diferencias significativas para la tasa de consumo (Kruskal- Wallis H = 3.07; p = 0.21) o impacto alimentario (Kruskal- Wallis H = 3.38; p = 0.18) entre las fracciones de tama&ntilde;o (Tabla 1, Figura 4). Al cuantificar el impacto alimentario conjugado de las tres fracciones de tama&ntilde;o en cada una de las estaciones de muestreo en la zona de estudio, se encontr&oacute; que fue altamente variable con registros equivalente entre 2% al 81% de la clorofila-a disponible (<a href="#fig4">Figura.4</a>).</p>      <p><font size="3"><b>4. Discusi&oacute;n</b></font></p>      <p>De acuerdo con Calbet (2001) el impacto alimentario del mesozooplancton (entre los que se incluyen a los cop&eacute;podos calanoideos) solo tendr&aacute; un efecto significativo en ambientes de alta producci&oacute;n, donde la trama tr&oacute;fica cl&aacute;sica parece ser la principal ruta para la transferencia del carbono. En ambientes oligotr&oacute;ficos, como el Oc&eacute;ano Pac&iacute;fico colombiano, los procesos de pastoreo "grazing" estar&iacute;an principalmente modulados por el accionar de los peque&ntilde;os consumidores (microzooplancton), quienes se encargan de la transformaci&oacute;n del carbono org&aacute;nico, direccion&aacute;ndolo a trav&eacute;s de la trama tr&oacute;fica pel&aacute;gica (Tsuda et al., 1989; Morales et al., 1991; Verity et al., 1996, Bradford-Grieve et al., 1998; Turner 2014). Sin embargo, la alta abundancia de los cop&eacute;podos en el ambiente pel&aacute;gico y su alta capacidad de producir agregados fecales (Fowler &amp; Knauer, 1986; Small et al., 1989; Altabet &amp; Small, 1990), posicionan a este grupo taxon&oacute;mico en un lugar clave dentro del proceso de flujo vertical de material biog&eacute;nico en la columna de agua (Ducklow et al., 2001; Sommer &amp; Stibor. 2002; Christina &amp; Passow, 2007; Beaugrand et al., 2010), condici&oacute;n que a&uacute;n no ha sido estudiada en el Oc&eacute;ano Pac&iacute;fico colombiano.</p>     ]]></body>
<body><![CDATA[<p>Una de las grandes dificultadas conceptuales asociadas con los procesos de estimaci&oacute;n de impacto alimentario del zooplancton, en el ambiente pel&aacute;gico, es la definici&oacute;n tr&oacute;fica funcional de herb&iacute;voros y carn&iacute;voros entre los diferentes grupos taxon&oacute;micos que conforman la comunidad zooplanct&oacute;nica. En este sentido es relativamente f&aacute;cil establecer un conjunto de taxa carn&iacute;voros como: los quetognatos, medusas, cten&oacute;foros, o heter&oacute;podos; sin embargo no es posible definir con claridad el de los herb&iacute;voros (Lavaniegos, 2007). Por lo tanto, ha sido sugerido hablar de un h&aacute;bito herb&iacute;voro-omn&iacute;voro o de organismos con dieta mixta (Gifford &amp; Dagg, 1991; Dam et al., 1993; Mauchline, 1998) cuando se hace referencia a los consumidores primarios presentes en el mesozooplancton entre los que se destacan los cop&eacute;podos (Kaehler et al., 2000, Trites, 2003; Martineau et al., 2004).</p>     <p>A pesar de esta limitaci&oacute;n conceptual, establecer el impacto del pastoreo de los cop&eacute;podos es esencial en el prop&oacute;sito de definir las rutas y establecer las tasas de flujo de material, a trav&eacute;s de las tramas alimentarias locales (Vidal 1980, Carlotti et al., 2000; Stibor et al., 2004, Forest et al., 2011). En este sentido, una gran transferencia de fitoplancton hacia los cop&eacute;podos puede estimular la producci&oacute;n de las pesquer&iacute;as pel&aacute;gicas, mientras que una baja transferencia favorecer&iacute;a el hundimiento del fitoplancton hacia el fondo de la columna de agua (Dagg, 1995; Ducklow et al., 2001).</p>     <p>Los estimados de consumo e impacto alimentario establecidos durante la presente investigaci&oacute;n, fueron consistentes con los reportados para otras localidades y regiones del Pac&iacute;fico. Por ejemplo Hern&aacute;ndez-Trujillo et al. (2007), reportaron para la Bah&iacute;a de La Paz, Baja California Sur, M&eacute;xico, tasas de consumo de cop&eacute;podos herb&iacute;voros entre 5.2 a 18.4 mg clo-a ind-1 y un impacto de pastoreo equivalente a entre 1.0% y 43% de la clorofila-a disponible, valores similares a los reportados para la estaci&oacute;n E77 del Pac&iacute;fico Colombiano (Malpelo). Incluso en zonas de surgencia como la costa del Per&uacute; han sido reportados impactos alimentarios equivalentes al 80% de la clorofila-a disponible (Boyd &amp; Smith 1983), valor similar al registrado para E49 durante la presente investigaci&oacute;n.</p>     <p>Son muchos los factores que pueden regular el impacto de pastoreo de los cop&eacute;podos calanoideos sobre el fitoplancton en una localidad o regi&oacute;n. Entre estos se destacan el tama&ntilde;o, sexo y estadio de vida de los organismos, la concentraci&oacute;n y el tama&ntilde;o del alimento, la composici&oacute;n qu&iacute;mica del alimento, la historia previa de alimentaci&oacute;n y las caracter&iacute;sticas f&iacute;sicas del medio (Parsons &amp; LeBrasseur, 1970; Atkinson, 1995; Friedman &amp; Strickler, 1975; Garc&iacute;a-P&aacute;manes et al., 1991; Huntley et al., 2000). El efecto de estos factores provoca una alta variabilidad en las estimaciones de tasas de pastoreo o impacto alimentario, tanto a corta escala como a gran escala espacial y temporal, y en ambientes tropicales, templados y boreales (Dagg et al., 1980; Joiris et al., 1982; Cox et al., 1983; Conover &amp; Cota, 1995; Gifford, 1988; Bautista et al., 1992; Rom&aacute;n et al., 1993; Garc&iacute;a- Pan&aacute;mes et al., 2007), condici&oacute;n similar a la registrada para la zona oce&aacute;nica del Pac&iacute;fico colombiano.</p>     <p>A pesar de la reconocida importancia del pastoreo en el flujo del carbono para el ambiente pel&aacute;gico (Huskin et al., 2001) y que en los ambientes tropicales se genera cerca del 80% de la producci&oacute;n primaria global, que representa el 70% del carbono total exportado en el Oc&eacute;ano (Karl et al., 1996), los trabajos sobre pastoreo para la zona tropical y en especial en el Pac&iacute;fico Oriental han sido escasos y espor&aacute;dicos (Arinardi et al., 1990; Dam et al., 1995; Fern&aacute;ndez-Ãlamo &amp; F&auml;rber-Lorda, 2006). En este contexto, los resultados de esta investigaci&oacute;n se constituyen en la primera cuantificaci&oacute;n de impacto alimentario por parte del mesozooplancton en la provincia oce&aacute;nica del Pac&iacute;fico colombiano y es una de las escasas referencias de "grazing" para el Oc&eacute;ano Pac&iacute;fico Oriental Tropical.</p>      <p><font size="3"><b>Agradecimientos</b></font></p>      <p>A los funcionarios del Centro Control Contaminaci&oacute;n del Pac&iacute;fico (CCCP) por su apoyo durante la planificaci&oacute;n y ejecuci&oacute;n de las campa&ntilde;as de muestreo, en especial al Capit&aacute;n de Corbeta Javier Ortiz, Dr. Efra&iacute;n Rodr&iacute;guez-Rubio y t&eacute;cnicos navales Juan Rueda y Diego Guerrero. Este trabajo fue financiado parcialmente por la Direcci&oacute;n General Mar&iacute;- tima (DIMAR), el Centro Control Contaminaci&oacute;n del Pac&iacute;fico (CCCP) y la Universidad del Valle, en el marco del proyecto de investigaci&oacute;n "Respuesta local de la comunidad zooplanct&oacute;nica del sistema pel&aacute;gico del Pac&iacute;fico Colombiano a forzantes de gran escala, CI7709" a favor de A. Giraldo.</p>  <hr>      <p><font size="3"><b>Referecias</b></font></p>      <!-- ref --><p>Altabet, M.A., &amp; Small, L.F. (1990). Nitrogen isotopic ratios in fecal pellets produced by marine zooplankton. <i>Geochim. Cosmochim. Acta. 54 </i>(1), 155-163.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6436155&pid=S0121-1935201400020000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
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<body><![CDATA[<p><img src="img/revistas/rcien/v18n2/cc.jpg">    <br> Revista de Ciencias por Universidad del Valle se encuentra bajo una licencia <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">Creative Commons Reconocimiento 4.0.</a></p>  </font>      ]]></body><back>
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