<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282016000200279</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Trophic circulation in ecosystems]]></article-title>
<article-title xml:lang="es"><![CDATA[Circulación trófica en los ecosistemas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zetina-Rejón]]></surname>
<given-names><![CDATA[Manuel J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brown-Peterson]]></surname>
<given-names><![CDATA[Nancy J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monte Luna]]></surname>
<given-names><![CDATA[Pablo del]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Escalona]]></surname>
<given-names><![CDATA[Víctor Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[Mark S]]></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 Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,The University of Southern Mississippi Department of Coastal Sciences ]]></institution>
<addr-line><![CDATA[Ocean Springs MS]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of British Columbia Institute for the Oceans and Fisheries ]]></institution>
<addr-line><![CDATA[Vancouver British Columbia]]></addr-line>
<country>Canada</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<volume>3</volume>
<numero>8</numero>
<fpage>279</fpage>
<lpage>291</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282016000200279&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282016000200279&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282016000200279&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The trophic aspect of ecology has been studied for more than six decades; in this contribution we address theoretical aspects relative to the concept of trophic flow at the ecosystem level and from the thermodynamics point of view. Much of this knowledge is greatly based on the consideration that ecosystems are functional units that are worth global study. Undoubtedly, a key element in the study of ecosystems relates to energy circulation through food webs. Although trophic ecology has been a sufficiently studied topic, we have not found a formal description of the trophic flow concept. Thus, this work proposes a concept based on movements of matter and energy amongst the biological components of the ecosystem. We include Odum's universal model of energy flow to synthesize the concept of trophic flow in the ecosystem. Additionally, we analyze the ecosystem thermodynamics, we discuss the characteristics of ecosystems as open and dissipation systems, and we indicate which types of mechanisms can regulate trophic flow in ecosystem. Finally, we discuss how the study of trophic flow is helpful for characterization of ecosystems structure and function, and it is important to consider it in ecosystems-based management as well.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El aspecto trófico de la ecología ha sido estudiado por más de seis décadas. Esta revisión aborda aspectos teóricos relativos al concepto de flujo trófico a nivel del ecosistema desde el punto de vista termodinámico. La mayoría de este conocimiento se basa, en gran medida, en la consideración de que los ecosistemas son unidades funcionales y que merecen un estudio global. Sin lugar a dudas, un elemento clave en el estudio de los ecosistemas se relaciona con la circulación de energía en las redes tróficas. Aunque la ecología trófica ha sido un tema bastante estudiado, no existe una descripción formal del concepto de flujo trófico. En este trabajo se propone un concepto que se basa en los movimientos de materia y energía entre los componentes biológicos del ecosistema. Se utiliza el modelo universal de flujo de energía de Odum para sintetizar el concepto de flujo trófico en el ecosistema. Adicionalmente se analiza la termodinámica de los ecosistemas y se discuten las características de los ecosistemas como sistemas abiertos y disipadores. Por último se discute cómo el estudio de los flujos tróficos es de gran ayuda para la caracterización de la estructura y la función de los ecosistemas, además de su relevancia en el manejo basado en el ecosistema.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Ecosystem]]></kwd>
<kwd lng="en"><![CDATA[trophic flow]]></kwd>
<kwd lng="en"><![CDATA[food web]]></kwd>
<kwd lng="en"><![CDATA[thermodynamics]]></kwd>
<kwd lng="en"><![CDATA[dissipative structures]]></kwd>
<kwd lng="es"><![CDATA[Ecosistema]]></kwd>
<kwd lng="es"><![CDATA[flujo trófico]]></kwd>
<kwd lng="es"><![CDATA[red trófica]]></kwd>
<kwd lng="es"><![CDATA[termodinámica]]></kwd>
<kwd lng="es"><![CDATA[estructuras disipativas]]></kwd>
</kwd-group>
</article-meta>
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