<?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>S2007-90282015000100008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Importancia y estudios de las comunidades microbianas en los recursos y productos pesqueros]]></article-title>
<article-title xml:lang="en"><![CDATA[Studies and importance of microbial communities in fishery resources and products]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Leyva]]></surname>
<given-names><![CDATA[María Concepción de la]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamudio-Maya]]></surname>
<given-names><![CDATA[Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corona-Cruz]]></surname>
<given-names><![CDATA[Alma Irene]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-de la Cruz]]></surname>
<given-names><![CDATA[José Ulises]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Herrera]]></surname>
<given-names><![CDATA[Rafael Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica Multidisciplinaria de los Ríos ]]></institution>
<addr-line><![CDATA[Tenosique Tabasco]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Yucatán Facultad de Ingeniería Química ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2015</year>
</pub-date>
<volume>2</volume>
<numero>4</numero>
<fpage>99</fpage>
<lpage>115</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282015000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282015000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282015000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los microorganismos son parte fundamental de la vida del planeta. La flora bacteriana constituye un componente esencial de las redes tróficas en los ecosistemas marinos, tanto en actividad como en cantidad de biomasa, contribuyendo a la regeneración de nutrientes e interactuando con una amplia gama de organismos. Para comprender su función en los nichos específicos, es esencial identificar y cuantificar cada uno de los miembros que conforman estas comunidades, así como las actividades metabólicas que presentan. La detección e identificación de estos microorganismos permite inferir sobre la diversidad poblacional en la muestra analizada o el estado de salud del consumidor. Por otro lado, este conocimiento puede ofrecer, el aprovechamiento de cepas o de metabolitos microbianos en procesos biotecnológicos. Una alternativa eficiente para la investigación de comunidades bacterianas en muestras complejas ha sido el análisis del gen 16S ARNr con métodos moleculares de huellas genéticas como RAPD, TRFLP, DGGE. En este contexto, diversos autores indican que los recursos pesqueros poseen una abundante diversidad bacteriana que pueden ser aprovechadas, que si se identifica oportunamente, previene daños en el recurso pesquero y a los consumidores.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Microorganisms are an essential part of life in the planet. The bacterial flora is an crucial component of trophic webs in marine ecosystems, both in activity and quantity of biomass, contributing to nutrient recycling and establishing complex interactions with a wide range of organisms. To understand its role in specific niches, it is essential to identify and quantify each of the members who make up these communities, then to infer the taxonomic and genetic diversity in the analyzed sample. For food products, these analyses may bring information on possible effects on the health of the consumer or may allow the isolation of microbial strains or metabolites useful in biotechnological processes. Health of the consumer. Furthermore, this knowledge can provide, the use of strains or microbial metabolites in biotechnological processes. An efficient alternative for the investigation of bacterial communities in complex samples has been the analysis of the 16S rRNA gene by fingerprinting methods as RAPD, TRFLP and DGGE. In this context, several authors indícate that fish stocks have an abundant associated bacterial flora bearing biotechnological potential or that may help, prevents damages to the fishery resource and final consumers.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Comunidades microbianas]]></kwd>
<kwd lng="es"><![CDATA[métodos moleculares]]></kwd>
<kwd lng="es"><![CDATA[productos pesqueros]]></kwd>
<kwd lng="en"><![CDATA[Microbial communities]]></kwd>
<kwd lng="en"><![CDATA[molecular methods]]></kwd>
<kwd lng="en"><![CDATA[fishery products]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culo de revisi&oacute;n</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Importancia y estudios de las comunidades microbianas en los recursos y productos pesqueros</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="3"><b>Studies and importance of microbial communities in fishery resources and products</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b><sup>1*</sup>Mar&iacute;a Concepci&oacute;n de la Cruz&#45;Leyva, <sup>2</sup>Marcela Zamudio&#45;Maya, <sup>2</sup>Alma Irene Corona&#45;Cruz, <sup>1</sup>Jos&eacute; Ulises Gonz&aacute;lez&#45;de la Cruz, <sup>2</sup>Rafael Antonio Rojas&#45;Herrera</b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><sup>1</sup>Divisi&oacute;n Acad&eacute;mica Multidisciplinaria de los R&iacute;os, Universidad Ju&aacute;rez Aut&oacute;noma de Tabasco. Carretera Tenosique&#45;Estapilla Km 1, Tenosique. Tabasco, M&eacute;xico.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><sup>2</sup>Facultad de Ingenier&iacute;a Qu&iacute;mica, Universidad Aut&oacute;noma de Yucat&aacute;n, M&eacute;rida Yucat&aacute;n *<a href="mailto:concepcion.delacruz@ujat.mx">concepcion.delacruz@ujat.mx</a>.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 10 de junio de 2010    <br> 	Aceptado el 22 de agosto de 2014</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los microorganismos son parte fundamental de la vida del planeta. La flora bacteriana constituye un componente esencial de las redes tr&oacute;ficas en los ecosistemas marinos, tanto en actividad como en cantidad de biomasa, contribuyendo a la regeneraci&oacute;n de nutrientes e interactuando con una amplia gama de organismos. Para comprender su funci&oacute;n en los nichos espec&iacute;ficos, es esencial identificar y cuantificar cada uno de los miembros que conforman estas comunidades, as&iacute; como las actividades metab&oacute;licas que presentan. La detecci&oacute;n e identificaci&oacute;n de estos microorganismos permite inferir sobre la diversidad poblacional en la muestra analizada o el estado de salud del consumidor. Por otro lado, este conocimiento puede ofrecer, el aprovechamiento de cepas o de metabolitos microbianos en procesos biotecnol&oacute;gicos. Una alternativa eficiente para la investigaci&oacute;n de comunidades bacterianas en muestras complejas ha sido el an&aacute;lisis del gen 16S ARNr con m&eacute;todos moleculares de huellas gen&eacute;ticas como RAPD, TRFLP, DGGE. En este contexto, diversos autores indican que los recursos pesqueros poseen una abundante diversidad bacteriana que pueden ser aprovechadas, que si se identifica oportunamente, previene da&ntilde;os en el recurso pesquero y a los consumidores.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Comunidades microbianas, m&eacute;todos moleculares, productos pesqueros.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Microorganisms are an essential part of life in the planet. The bacterial flora is an crucial component of trophic webs in marine ecosystems, both in activity and quantity of biomass, contributing to nutrient recycling and establishing complex interactions with a wide range of organisms. To understand its role in specific niches, it is essential to identify and quantify each of the members who make up these communities, then to infer the taxonomic and genetic diversity in the analyzed sample. For food products, these analyses may bring information on possible effects on the health of the consumer or may allow the isolation of microbial strains or metabolites useful in biotechnological processes. Health of the consumer. Furthermore, this knowledge can provide, the use of strains or microbial metabolites in biotechnological processes. An efficient alternative for the investigation of bacterial communities in complex samples has been the analysis of the 16S rRNA gene by fingerprinting methods as RAPD, TRFLP and DGGE. In this context, several authors ind&iacute;cate that fish stocks have an abundant associated bacterial flora bearing biotechnological potential or that may help, prevents damages to the fishery resource and final consumers.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Microbial communities, molecular methods, fishery products.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Desde un enfoque ecol&oacute;gico los microorganismos participan en el reciclado de la materia en los ecosistemas y por tanto, controlan la evoluci&oacute;n de la biosfera al interactuar de forma din&aacute;mica en los ciclos biogeoqu&iacute;micos (Lyautey <i>et al.</i> 2005), desde el punto de vista de la seguridad alimentaria algunas familias bacterianas como <i>Enterobacteriaceae</i> y <i>Vibrionaceae</i> incluyen especies que son las responsables de infecciones e intoxicaciones de los consumidores, que pueden originar hasta la p&eacute;rdida de vidas humanas.</font></p>  	    <p align="justify"><font face="verdana" size="2">Se estima que tan solo se conoce alrededor del 0.1 al 10 % de las bacterias del medioambiente (Torsvik <i>et al.</i> 2002), debido principalmente a que la mayor parte de los microorganismos no pueden ser aislados e identificados con los m&eacute;todos de cultivo tradicionales (Barer y Harwood 1999, Crosi <i>et al.</i> 2007), por lo que, los datos obtenidos mediante la aplicaci&oacute;n de estas metodolog&iacute;as subestiman la diversidad y riqueza de especies de la comunidad microbiana presente en la muestra. Por ejemplo, las cepas en estado de dormancia o en estado viable pero no cultivable no son detectadas (Alam <i>et al.</i> 2006).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los m&eacute;todos de detecci&oacute;n de huellas gen&eacute;ticas basadas en el estudio del material gen&eacute;tico (ADN &oacute; ARN), permiten conocer un perfil representativo de la estructura poblacional en una comunidad bacteriana asociada a determinado h&aacute;bitat, detectando a las poblaciones sean o no cultivables (Muyzer <i>et al.</i> 1993, Huber <i>et al.</i> 2004). La reacci&oacute;n en cadena de la polimerasa (PCR) en combinaci&oacute;n con otras metodolog&iacute;as han permitido el estudio de la composici&oacute;n de comunidades bacterianas en muestras de sedimentos marinos (Muyzer <i>et al.</i> 1993), estuarinos (Henriques <i>et al.</i> 2006), biopel&iacute;culas en sistemas acu&aacute;ticos (Lyautey <i>et al.</i> 2005), asociadas a organismos acu&aacute;ticos (Mclntosh <i>et al.</i> 2008, Yang <i>et al.</i> 2007) y diversos productos alimentarios. A pesar de los avances que se tienen es necesario extrapolar este tipo de investigaciones a los productos pesqueros, ya que la detecci&oacute;n e identificaci&oacute;n de la flora bacteriana presente, as&iacute; como el estado metab&oacute;lico en el que se encuentran ofrece la posibilidad de tomar decisiones oportunas sobre el tratamiento, manejo y disponibilidad de alimentos de origen marino para un mejor aprovechamiento.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los productos pesqueros son una fuente importante de prote&iacute;nas y otros componentes nutritivos en la alimentaci&oacute;n humana. Entre estos productos se clasifican peces y mariscos; en estos &uacute;ltimos se agrupan camarones, ostras, ostiones, almejas, calamares, pulpos, entre otros. Debido a su composici&oacute;n qu&iacute;mica y h&aacute;bitat los recursos pesqueros poseen una abundante diversidad microbiana que puede interactuar de forma positiva, como control biol&oacute;gico de enfermedades para el propio animal (Aly <i>et al.</i> 2008); negativas, cuando causa enfermedad, muerte o contaminaci&oacute;n de los recursos pesqueros en las etapas larval, adulta y reproductiva (Goldschmidt&#45;Clermont <i>et al.</i> 2008). Al igual que deterioro del producto y trasmisi&oacute;n de enfermedades a los consumidores. En la presente revisi&oacute;n se pretende analizar la importancia del estudio de las comunidades microbianas asociadas a recursos y productos pesqueros, as&iacute; como las metodolog&iacute;as independientes de cultivo que actualmente se utilizan para estos fines.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>LAS COMUNIDADES MICROBIANAS Y LA IMPORTANCIA DE SU ESTUDIO</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Cuando se desea analizar a una especie o grupo biol&oacute;gico, es importante conocer el contexto ambiental y biol&oacute;gico en el que se encuentra; esto &uacute;ltimo se refiere a las especies con las que coexiste y en muchos casos de las que depende (hospedero). El conjunto de especies que coexisten en un lugar y tiempo constituye la comunidad o consorcio (Begon <i>et al.</i> 2006). En un sistema microbiano el crecimiento celular forma poblaciones; las poblaciones metab&oacute;licamente relacionadas se denominan gremios y el conjunto de estas agrupaciones interaccionan formando comunidades microbianas. Por lo tanto, las comunidades microbianas consisten en poblaciones de c&eacute;lulas de varias especies; que interact&uacute;an entre s&iacute; desarrollando m&uacute;ltiples actividades funcionales al interior de la comunidad y con su hospedero (D&iacute;az y Wacher 2003).</font></p>  	    <p align="justify"><font face="verdana" size="2">En el enfoque ecol&oacute;gico, la mayor&iacute;a de las comunidades bacterianas sufren perturbaciones intermitentes como escasez de alimento, sequ&iacute;a, congelamiento&#45;descongelamiento, exposici&oacute;n a altas concentraciones salinas y otras alteraciones causadas por las variaciones naturales del entorno o por la actividad humana. Estos factores ambientales estresantes y los metabolitos que liberan los microorganismos para enfrentarlas (enzimas, exopolisac&aacute;ridos, amino&aacute;cidos, az&uacute;cares, &aacute;cidos org&aacute;nicos, antimicrobianos, entre otros), crean oportunidades para que nuevas especies se establezcan dentro de la comunidad. Cabe citar que una perturbaci&oacute;n fuerte puede causar la desintegraci&oacute;n del microh&aacute;bitat y la disrupci&oacute;n de los l&iacute;mites entre poblaciones, lo que permitir&aacute; que los recursos locales est&eacute;n disponibles para una mayor proporci&oacute;n de la masa microbiana total, es decir, m&aacute;s individuos pero menos especies (Torsvik y Ovreas 2002). A pesar de estos antecedentes, a&uacute;n se tiene poca informaci&oacute;n sobre las relaciones simbi&oacute;ticas, comensales o parasitarias que mantienen los miembros de una comunidad microbiana (Zengler <i>et al.</i> 2002).</font></p>  	    <p align="justify"><font face="verdana" size="2">La integraci&oacute;n de una comunidad microbiana funcional se regula mediante se&ntilde;ales qu&iacute;micas denominadas autoinductores, usadas como comunicaci&oacute;n de c&eacute;lula a c&eacute;lula con sus vecinos en el h&aacute;bitat (Kaeberlein <i>et al.</i> 2002). La N&#45;acil&#45;homoserina lactona (AHL) es uno de los autoinductores m&aacute;s estudiados en bacterias Gram&#45;negativas, liberada como una se&ntilde;al de censado (<i>Enterobacteriaceae</i>), que permite coordinar diferentes funciones (Dong <i>et al.</i> 2002; Joost <i>et al.</i> 2007) de conveniencia (simbiosis), competencia (antagonismo), activaci&oacute;n o represi&oacute;n de genes espec&iacute;ficos, los cuales pueden participar en la determinaci&oacute;n de la densidad poblacional, debido a la competencia por un nicho ecol&oacute;gico o sustrato (Joost <i>et al.</i> 2007), formaci&oacute;n de biopel&iacute;culas (Lyautey <i>et al.</i> 2005), s&iacute;ntesis de compuestos inhibitorios como los antibi&oacute;ticos, actividad como agentes de biocontrol y otras funciones biol&oacute;gicas como la producci&oacute;n de factores patog&eacute;nicos con su hospedero (Wiklund <i>et al.</i> 2000, Huber <i>et al.</i> 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2">En t&eacute;rminos de ecolog&iacute;a microbiana, la abundancia y distribuci&oacute;n de las especies, pueden ser usados para describir la estructura de la comunidad; existen &iacute;ndices como el &iacute;ndice de Shannon&#45;Weaver y el de Simpson, entre otros para calcular la diversidad, modelos biol&oacute;gicos y te&oacute;ricos para explicar la distribuci&oacute;n del n&uacute;mero de especies en clases de abundancias. La utilizaci&oacute;n de estas medidas se hace dentro de un contexto funcional, es decir, la diversidad o el reparto de los individuos entre las especies es consecuencia de interacciones ecol&oacute;gicas entre ellas, de las relaciones entre &eacute;stas y su medioambiente (Magurran 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2">El estudio de las comunidades bacterianas presentes en el medioambiente tiene una enorme relevancia en cuanto al conocimiento de la diversidad biol&oacute;gica global y de los ciclos biogeoqu&iacute;micos que tienen lugar en el planeta (L&oacute;pez y Zaballos 2005), como es el caso de las bacterias sulfato reductoras <i>Desulfotalea/Desulforhopalus, Desulfofaba, Desu liosa reina</i> y <i>Desulfobacter</i> (Purdy <i>et al.</i> 2003).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los microorganismos son capaces de utilizar nutrientes y diversos elementos que otros organismos superiores no pueden explotar. Mediante el reciclado de estos elementos (Lyautey <i>et al.</i> 2005) regulan la disponibilidad de nutrimentos en los ambientes acu&iacute;fero y marino, que pueden ser utilizados por los peces y mariscos (Purdy <i>et al.</i> 2003) y, en el terrestre, predomina la fertilidad del suelo y el desarrollo de las plantas que sustentan el reino animal, por lo que constituyen la base de la cadena alimentaria en la que los compuestos elementales se movilizan en la biosfera (Guerrero y Berlanga 2005). El an&aacute;lisis de las comunidades bacterianas permite inferir sobre las funciones positivas y negativas de los gremios o poblaciones que la conforman (Huber <i>et al.</i> 2004, Dom&iacute;nguez <i>et al.</i> 2006, Aly <i>et al.</i> 2008), permitiendo el aprovechamiento de consorcios, cepas y metabolitos bacterianos con actividades funcionales aprovechables por el hombre. En los &uacute;ltimos a&ntilde;os en la acuicultura de camarones <i>Litopenaeus vannamei</i> y peces se han aprovechando los consorcios microbianos como fuente de alimento, as&iacute; como en el mejoramiento del ambiente en el cultivo (Becerra&#45;D&oacute;rame <i>et al.</i> 2011, 2014).</font></p>  	    <p align="justify"><font face="verdana" size="2">Recientemente el estudio de las comunidades microbianas, su diversidad y estatus metab&oacute;lico era dif&iacute;cil, debido a que la mayor&iacute;a de los microorganismos no son cultivados mediante el uso de las t&eacute;cnicas tradicionales de la microbiolog&iacute;a. Esto obedece a diversas razones, condiciones ambientales, requerimientos nutricionales, desconocimiento de la fisiolog&iacute;a del microorganismo de inter&eacute;s y fundamentalmente, a causa del amplio desconocimiento de las interacciones que tienen lugar en la comunidad microbiana. En la actualidad la aplicaci&oacute;n de t&eacute;cnicas moleculares, permiten el an&aacute;lisis de las secuencias de genes espec&iacute;ficos e incluso de genomas completos, permitiendo grandes avances en el estudio de los microorganismos en poco tiempo (Giraffa y Neviani 2001, Torsvik y Ovreas 2002, Croci <i>et al.</i> 2007).</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>ESTUDIO MOLECULAR DE COMUNIDADES BACTERIANAS</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La incapacidad de cultivar las bacterias presentes en un h&aacute;bitat determinado, ha sido parcialmente suplida por la posibilidad de aislar y caracterizar el material gen&eacute;tico de la comunidad microbiana residente en dicho medio. A partir del estudio de los genomas de los microorganismos contenidos en la muestra, es posible reconstruir la estructura poblacional de la comunidad (Yang <i>et al.</i> 2007). Al conjunto de los genomas de los microorganismos de una muestra o h&aacute;bitat determinado se le llama metagenoma (Handelsman <i>et al.</i> 1998, Handelsman 2004). Este tipo de investigaci&oacute;n parte del an&aacute;lisis de los &aacute;cidos nucleicos e incluye a aquellos microorganismos que a&uacute;n no han podido ser cultivados en condiciones simuladas (Villadas <i>et al.</i> 2002, Alam <i>et al.</i> 2006, de la Cruz&#45;Leyva <i>et al.</i> 2011).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La reacci&oacute;n en cadena de la polimerasa (PCR), desarrollada por K. Mull&iacute;s en la d&eacute;cada de los 80 (Mull&iacute;s <i>et al.</i> 1987, Mull&iacute;s 1990, Saiki <i>et al.</i> 1985, Saiki <i>et al.</i> 1988), es la metodolog&iacute;a empleada para la amplificaci&oacute;n selectiva de secuencias de &aacute;cidos nucleicos. Mediante esta t&eacute;cnica es posible realizar sucesivas amplificaciones a partir de peque&ntilde;as cantidades de ADN. Adem&aacute;s, por medio de la transcripci&oacute;n inversa y posterior PCR (RT&#45;PCR) se lleva a cabo la conversi&oacute;n del ARN a ADN complementario (ADNc) y la amplificaci&oacute;n, ofreciendo as&iacute; la posibilidad de realizar an&aacute;lisis en el ADN y ARN asociados a diversas muestras complejas para poder hacer inferencias sobre la composici&oacute;n poblacional y el estatus metab&oacute;lico de la comunidad (Kim <i>et al.</i> 2007), mediante el an&aacute;lisis de las secuencias de los genes amplificados con iniciadores espec&iacute;ficos o universales.</font></p>  	    <p align="justify"><font face="verdana" size="2">Por medio del an&aacute;lisis de secuencias de genes ort&oacute;logos, es posible medir la distancia evolutiva entre organismos e inferir las relaciones filogen&eacute;tico&#45;evolutivas, que constituyen la base natural para clasificarlos (D&iacute;az y Wacher 2003). Para comparar secuencias es necesario alinear las mol&eacute;culas, por lo que deben contener regiones con similitud significativa, adem&aacute;s de las que difieren en sus secuencias y &eacute;stas deben cambiar a una velocidad proporcional a la distancia evolutiva (Walter <i>et al.</i> 2000, Case <i>et al.</i> 2007). Los genes elegidos deben estar universalmente distribuidos en el grupo que se desea estudiar y deben ser funcionalmente hom&oacute;logos en cada organismo.</font></p>  	    <p align="justify"><font face="verdana" size="2">La descripci&oacute;n de los microorganismos existentes en muestras ambientales presentan avances, gracias a la utilizaci&oacute;n de la informaci&oacute;n que proporcionan los genes que codifican el ARN riboso&#45;mal, en particular el gen que codifica la subunidad menor del ribosoma bacteriano, 16S ARNr. Esta mol&eacute;cula est&aacute; presente en todos los organismos y en todos desempe&ntilde;a la misma funci&oacute;n. Si bien tiene limitaciones, dado que diferentes regiones de la mol&eacute;cula presentan distinto grado de variabilidad en secuencia entre los diferentes taxa, permite realizar comparaciones con varios niveles de resoluci&oacute;n. El an&aacute;lisis de la secuencia de estos genes permite realizar reconstrucciones filogen&eacute;ticas entre los microorganismos, lo que ha llevado a la reestructuraci&oacute;n de la taxonom&iacute;a moderna (Col&eacute; <i>et al.</i> 2005; Woese <i>et al.</i> 1990; Woese 1998). La amplificaci&oacute;n de regiones espec&iacute;ficas del gen 16S ARNr su posterior secuenciaci&oacute;n y comparaci&oacute;n de &eacute;stas con otras de referencia, permite establecer las relaciones filogen&eacute;ticas existentes entre organismos procariotas y la identificaci&oacute;n de las bacterias. Con este prop&oacute;sito frecuentemente se recurre a bases de datos como la GenBank del National Center for Biotechnology Information (NCBI) y laRibosomal Database Project (RDP) de la Universidad Estatal de Michigan (Col&eacute; <i>et al.</i> 2009); en esta &uacute;ltima hay depositadas 2 929 433 secuencias disponibles del gen 16S ARNr de los dominios bacterias y Arqu&eacute;ales, y 95 365 secuencias del gen 28S ARNr de hongos hasta 14 de julio de 2014.</font></p>  	    <p align="justify"><font face="verdana" size="2">Para obtener mayor conocimiento de la diversidad y estructura de las comunidades microbianas en distintos ambientes, se han adaptado algunas herramientas moleculares, para ser utilizadas con fines taxon&oacute;micos (Gonz&aacute;lez&#45;de la Cruz <i>et al.</i> 2011). En la &uacute;ltima d&eacute;cada se ha extendido el uso de &eacute;stas t&eacute;cnicas, tambi&eacute;n usando genes funcionales como marcadores moleculares, para poder relacionar la estructura y funci&oacute;n de las comunidades microbianas (Muyzer y Smalla <i>et al.</i> 1998). El perfil de la diversidad gen&eacute;tica bacteriana en la comunidad puede ser analizado mediante m&eacute;todos de huellas g&eacute;nicas como los RAPD (Random Amplified Polymorphic DNA), ARDRA (Amplified Ribosonal DNA Restric&#45;tion Analysis), T&#45;RFLP (Terminal Restriction Fragment Length Polymorphism), TGGE (Temperature Gradient Electrophoresis Gel) y DGGE (Denaturing Gradient Gel Electrophoresis) (Welsh y McCelland 1990, Muyzer <i>et al.</i> 1993, Liu <i>et al.</i> 1997, Osborn <i>et al.</i> 2000, Walter <i>et al.</i> 2000, Martin&#45;Laurent <i>et al.</i> 2001). Este &uacute;ltimo, es un m&eacute;todo ampliamente utilizado para la obtenci&oacute;n de huellas gen&eacute;ticas en distintos tipos de muestra ambientales y comunidades microbianas complejas (D&iacute;az y Wacher 2003, Gonz&aacute;lez&#45;de la Cruz <i>et al.</i> 2011).</font></p>  	    <p align="justify"><font face="verdana" size="2">La t&eacute;cnica de DGGE se ha utilizado para detectar diferencias en el comportamiento de peque&ntilde;os fragmentos (200&#45;700 pb) de genes obtenidos mediante PCR (amplicones). Los oligonucle&oacute;tidos que se utilizan en el an&aacute;lisis, deben contener en el extremo 5 una secuencia rica en GC de unas 40 bases, denominada grapa GC (GC&#45;clamp), cuya funci&oacute;n es impedir la desnaturalizaci&oacute;n completa y la aparici&oacute;n de hebras de ADN de cadena sencilla. A trav&eacute;s de la desnaturalizaci&oacute;n progresiva del ADN o ADNc amplificado se obtiene un patr&oacute;n de bandas que permite identificar y cuantificar la diversidad gen&eacute;tica presente en la flora microbiana (Muyzer <i>et al.</i> 1993). La intensidad de las bandas indica la abundancia relativa de poblaciones espec&iacute;ficas en la comunidad de inter&eacute;s; es importante tener presente que en ocasiones esta intensidad puede deberse a numerosas copias de una misma secuencia en el mismo organismo, o a que existen muchas c&eacute;lulas del organismo que poseen la secuencia. Por lo anterior, es importante la pericia en la detecci&oacute;n y ajuste del contorno de la banda y los fundamentos de ecolog&iacute;a poblacional del investigador que genera y describe estos resultados (Escalante 2007). Una forma de distinguir entre estas dos posibilidades, es mediante la t&eacute;cnica de hibridaci&oacute;n <i>in situ.</i> Otra alternativa es correr en el mismo gel los productos de la PCR de ARNr y ADNr para comparar la intensidad de las bandas y con &eacute;stos, determinar si &eacute;stas se encuentran relacionadas con el n&uacute;mero de copias del gen.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>&Iacute;NDICES DE DIVERSIDAD EN COMUNIDADES BACTERIANAS</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Biodiversidad es la riqueza de organismos vivos de un ecosistema, as&iacute; como los complejos ecol&oacute;gicos de los que forman parte; comprende la variaci&oacute;n dentro de cada especie, entre las especies y los ecosistemas (Moreno 2001). El conocimiento de la biodiversidad requiere considerar los diferentes niveles jer&aacute;rquicos de organizaci&oacute;n de la vida (genes, especies, poblaciones, comunidades y ecosistemas), junto con sus atributos de composici&oacute;n, estructura y funcionalidad. Su estudio puede abordarse a partir de tres grandes preguntas en cada uno de los niveles: &iquest;qu&eacute; elementos la componen?, &iquest;c&oacute;mo est&aacute;n organizados? y &iquest;c&oacute;mo interact&uacute;an? (Noss 1990).</font></p>  	    <p align="justify"><font face="verdana" size="2">En estudios de biodiversidad se debe especificar la escala geogr&aacute;fica, definir si es local o regional, para asociarla a las medidas de la diversidad alfa (&#945;), beta (&#946;) y gamma (&#947;). El n&uacute;mero de especies o diversidad &#945; est&aacute; referida a un nivel local y refleja la coexistencia de las especies en una comunidad. La diversidad &#945; es la riqueza de especies de una comunidad determinada y que se considera homog&eacute;nea. La diversidad &#946; es la medida del grado de cambio o reemplazo en la composici&oacute;n de especies entre diferentes comunidades en una regi&oacute;n; refleja la respuesta de los organismos a la heterogeneidad espacial (Halffter <i>et al.</i> 2001, Moreno 2001, Villareal <i>et al</i> 2006. La diversidad &#947; es la riqueza total de especies en una regi&oacute;n en la cual se incluyen varias comunidades o el recambio existente entre regiones; refleja fundamentalmente los procesos evolutivos que han actuado en un nivel geogr&aacute;fico mayor (Halffter <i>et al.</i> 2001). La caracterizaci&oacute;n de las especies provee una medida de la variedad de formas de vida, adem&aacute;s aporta informaci&oacute;n de diferentes facetas de esa variedad, como diversidad funcional, diversidad a diferentes niveles taxon&oacute;micos y heterogeneidad espacial (Gast&oacute;n 1996).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los principales par&aacute;metros utilizados para estimar la diversidad en comunidades microbianas son riqueza de especie, &iacute;ndice de Shannon&#45;Weaver, &iacute;ndice de Simpson y equidad; la riqueza de especies (R), se define como el n&uacute;mero de diferentes organismos presentes en una muestra (Magurran 2004), sin tomar en cuenta el valor de importancia de las mismas (Moreno 2001). Shannon&#45;Weaver asume que todas las especies est&aacute;n representadas en las muestras; indica qu&eacute; tan uniformes est&aacute;n representadas las especies teniendo en cuenta todas las especies muestreadas (Shannon y Weaver 1963). El &iacute;ndice de Simpson (D) mide la probabilidad de que dos individuos seleccionados al azar en un h&aacute;bitat pertenezcan a la misma especie. En este &iacute;ndice mientras mayor sea su valor mayor ser&aacute; la diversidad de la comunidad, ya que este valor depende tanto de la riqueza de especies, como de la regularidad o equidad con que los individuos est&aacute;n distribuidos entre las especies. Una comunidad rica en especies, pero con una distribuci&oacute;n irregular de individuos, tendr&aacute; un &iacute;ndice m&aacute;s bajo que otra comunidad con una riqueza menor pero con los individuos bien distribuidos. Por lo tanto, cuando calculemos la diversidad para dos comunidades, aquella que genere un valor de D m&aacute;s alto y m&aacute;s cercano a la riqueza (R) ser&aacute; la m&aacute;s diversa. La equidad u homogeneidad, es la medida de la abundancia de cada especie y qu&eacute; tan uniformemente se encuentran distribuidas (Magurran 2004).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En ecolog&iacute;a microbiana, se ha investigado la diversidad bacteriana en diferentes ambientes acu&aacute;ticos comparando patrones de bandeo con t&eacute;cnicas de huellas digitales (T&#45;RFLP, RFLP, DGGE), para estimar la riqueza y composici&oacute;n de la comunidad, aplicando par&aacute;metros de diversidad (Boon <i>et al.</i> 2002; Cho y Kim 2000, Villanueva <i>et al.</i> 2007). Danovaro <i>et al.</i> (2006) indican que la diversidad bacteriana en diferentes ambientes acu&aacute;ticos comparando dos t&eacute;cnicas de huellas gen&eacute;ticas (T&#45;RFLP y ARISA), estimando la riqueza y composici&oacute;n de la comunidad bacteriana. Los &iacute;ndices de riqueza estimados mediante el m&eacute;todo de T&#45;RFLP oscilaron entre 27 y 99 filotipos, mientras que utilizando ARISA la riqueza se estim&oacute; entre 62 y 101 genotipos. Aunque las dos t&eacute;cnicas proporcionaron resultados similares en el an&aacute;lisis de la estructura de la comunidad, la riqueza de la diversidad bacteriana y las estimaciones fueron significativamente superiores utilizando ARISA. La Valley <i>et al.</i> (2009) evaluaron perfiles de bandeo de DGGE asociados a la comunidad bacteriana del osti&oacute;n japon&eacute;s <i>Crassostrea virginica</i>, analizada mediante estrategias dependiente e independiente (ADN total) de cultivo, utilizando &iacute;ndice de Shannon, el &iacute;ndice de similitud y an&aacute;lisis de agrupamiento de patrones de bandas en gel. Mediante un an&aacute;lisis de cl&uacute;ster se demostr&oacute; que hab&iacute;an diferencias en los patrones de bandeo y los &iacute;ndices de diversidad estimados, obtenidos mediante ambas estrategias. Tambi&eacute;n se detectaron diferencias significativas en los perfiles de la comunidad asociada a los ostiones y la del agua de mar.</font></p>  	    <p align="justify"><font face="verdana" size="2">Por lo anterior, las t&eacute;cnicas moleculares de huellas gen&eacute;ticas ofrecen una alternativa para el an&aacute;lisis de los cambios en la estructura de la comunidad microbiana, especialmente cuando se trata de un gran n&uacute;mero de muestras (Ramette 2009).</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>COMUNIDADES MICROBIANAS</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Aplicando metodolog&iacute;as de huellas gen&eacute;ticas, se estudi&oacute; la composici&oacute;n y din&aacute;mica de comunidades microbianas entre la columna de agua y el sistema de cr&iacute;a larval de la langosta <i>Panulirus ornatus</i> (Payne <i>et al.</i> 2006). Por otro lado, Hagi <i>et al.</i> (2004) utilizando el an&aacute;lisis de ADN polim&oacute;rfico amplificado al azar (RAPD) estudiaron la diversidad de bacterias &aacute;cido l&aacute;cticas (BAL) del tracto intestinal de peces de agua dulce (<i>Cyprinus carpi&oacute;, Ictalurus punctatus, Hypophthalmichthys molitrix, Carassius cuvieri</i>) a trav&eacute;s de cambios estacionales; entre todas las BAL, la especie predominante en verano fue <i>Lactococcus lactis</i> y <i>L. raffinolactis</i> en invierno independientemente de la especie del pez analizado.</font></p>  	    <p align="justify"><font face="verdana" size="2">Utilizando perfiles PCR&#45;DGGE se detect&oacute; la variaci&oacute;n en la estructura de la comunidad bacteriana de los peces <i>Pangasius hypophthalmus</i> cosechados en granja, en diferentes &eacute;poca del a&ntilde;o (Le Nguyen <i>et al.</i> 2008). Otras investigaciones relacionadas con el estudio de comunidades bacterianas en recursos pesqueros, han caracterizado mediante DGGE la microbiota intestinal del salm&oacute;n del atl&aacute;ntico <i>Salm&oacute;n salasar</i> identificando <i>Lactobacillus</i> sp, <i>Lactococcus</i> sp, <i>Bacillus</i> sp, <i>Photobacterium phosphoreum, Acinetobacter</i> sp, <i>Pseudomonas</i> sp y <i>Vibrio</i> sp (Hovda <i>et al.</i> 2007a). En un estudio de la poblaci&oacute;n bacteriana del bacalao <i>Gadus morhua</i> (huevo y larva), se detectaron <i>Arcobacter</i> sp, <i>Vibrio</i> sp, <i>Alteromonas</i> sp y <i>Pseudoalteromonas</i> sp, <i>Colwellia</i> sp, <i>Vibrio logei, V. fischeri</i> (reclasificado como <i>Aliivibrio logei</i>, A. <i>fischeri</i> respectivamente (Urbanczyk <i>et al.</i> 2007)), <i>Listonella anguillarum, Flexibacter aurantiacus</i> y <i>Mycoplamsa</i> sp (Mclntosh 2008).</font></p>  	    <p align="justify"><font face="verdana" size="2">Mientras que Huber <i>et al.</i> (2004), identificaron la microbiota dominante cultivable y no cultivable en el intestino de la trucha arco iris <i>Oncorhynchus mykiss</i>, utilizando una metodolog&iacute;a polif&aacute;sica que incluy&oacute; DGGE. La estructura pobla&#45;cional bacteriana fue identificada en su mayor&iacute;a como &#947;&#45;proteobacteria (principalmente <i>Aeromonas</i> y de la familia Enterobacteriaceae), tambi&eacute;n se detectaron <i>Acinetobacter, Pseudomonas, Shewanella, Plesiomonas, Proteus, &#946;&#45;proteobacteria y bacterias Gram&#45;positivas. Otra investigaci&oacute;n sustentan la dominancia de las y&#45;proteo bacterias en la microflora intestinal de los peces (Kim et al. 2007).</i></font></p>  	    <p align="justify"><font face="verdana" size="2">La importancia de &eacute;l estudio de comunidades bacterianas en los recursos pesqueros, se debe a que se ha generado un considerable inter&eacute;s en el uso de bacterias probi&oacute;ticas para incrementar la resistencia a enfermedades, mediante la estimulaci&oacute;n del sistema inmunol&oacute;gico en el cultivo de peces (Aly <i>et al.</i> 2008, Aguirre&#45;G&uacute;zman <i>et al.</i> 2012, Dad <i>et al.</i> 2014) y mariscos. En el camar&oacute;n <i>Marsupenaeus japonicus</i> se ha indicado el papel inmunomodulador de <i>Lactobacillus lactis</i> (Maeda <i>et al.</i> 2014) y en <i>L. vannamei</i> se observ&oacute; el efecto de la suplementaci&oacute;n de la dieta con <i>Bacillus subtilis</i> sobre el crecimiento y la respuesta inmune (Shen <i>et al.</i> 2010).</font></p>  	    <p align="justify"><font face="verdana" size="2">Dentro del grupo de bacterias con funciones biol&oacute;gicas positivas en la acuacultura, se citan bacterias &aacute;cido l&aacute;cticas (Michel <i>et al.</i> 2007, Maeda <i>et al.</i> 2014) <i>L. plantarum, L. helveticus</i> y <i>Streptococcus thermophilus</i> (Gatesoupe 1991), <i>B. subtilis, B. megaterium, B. circulans</i> (Ochoa&#45;Solano y Olmos&#45;Soto 2006; Bairagi <i>et al.</i> 2004, Kumar <i>et al.</i> 2006), <i>B. pumilus, B. firmus,</i> y algunas Gram&#45;negativas como <i>Citrobacter freundii</i> (Aly <i>et al.&lt;/&gt; 2008), V. alginolyticus (Rodr&iacute;guez et al. 2007) y otras Gram&#45;positivas Carnobacterium inhibens (Irianto y Austi 2002). La especie B. subtilis es ampliamente utilizada como probi&oacute;tico; por ejemplo, Ghosh et al. (2007) estudiaron la suplementaci&oacute;n para observar el efecto probi&oacute;tico sobre la transformaci&oacute;n reproductiva, en cuatro especies de peces ornamentales (Poecilia reticulata, P. sphenops, Xiphophorus helleri y X. maculatus), comprobando un incremento significativo en el &iacute;ndice gonadosom&aacute;tico, fecundidad y producci&oacute;n de alevines. G&uuml;nther y Jim&eacute;nez&#45;Montealegre (2004), revelaron el efecto positivo de la suplementaci&oacute;n de B. subtilis en la dieta, sobre el crecimiento de la tilapia Oreochromis niloticus y el langostino Macrobrachium rosenbergii. Por otro lado, la bacteria Aeromonas media produce sustancias extracelulares que han mostrado actividad inhibitoria sobre Saprolegnia parasitidica (Lategan et al. 2004). Se han usado ant&iacute;genos de V. angullarum (bacteria pat&oacute;gena) en Paralichthys olivaceus, obteniendo una respuesta inmune efectiva (Li et al. 2005); otros investigadores han aprovechado la immunoestimulaci&oacute;n larval y juvenil de algunos organismos acu&aacute;ticos, utilizando lipopolisac&aacute;ridos aislados de algunas bacterias como Aeromonas salmonicida (Magnadottir et al. 2006).</i></font></p>  	    <p align="justify"><font face="verdana" size="2">Con lo anterior se confirma que algunas de las especies bacterianas, aisladas de muestras ambientales y recursos pesqueros exhiben efectos funcionales positivos. A nivel mundial, el sector pesquero frecuentemente registra p&eacute;rdidas econ&oacute;micas causadas por enfermedades bacterianas pat&oacute;genas que infectan peces y mariscos en su h&aacute;bitat y en cautiverio (Michel <i>et al.</i> 2007, Panangala <i>et al.</i> 2007) (<a href="/img/revistas/era/v2n4/a8t1.jpg" target="_blank">Tabla 1</a>).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Se debe tener presente que hay recursos pesqueros que poseen en su flora bacteriana cepas ubicuas del g&eacute;nero <i>Vibrio</i> que son registrados como pat&oacute;genos, pero para ellos es parte de su flora natural y no les afecta negativamente. Tambi&eacute;n existen especies causantes de enfermedades infecciosas en organismos vivos y agentes contaminantes de alimentos y aguas, que pueden ser trasmitidas a los seres humanos mediante el consumo de productos pesqueros contaminados por <i>Staphylococcus aureus, E. coli</i>, entre otros produciendo trastornos gastrointestinales (Delgado <i>et al.</i> 2003, Gatti <i>et al.</i> 2014). Adem&aacute;s algunos serotipos son resistentes a los antibi&oacute;ticos como los de la <i>Salmonella (Amagliani et al. 2012) y Listeria monocytogenes (Fallah et al. 2013).</i></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>COMUNIDADES BACTERIANAS EN PRODUCTOS PESQUEROS</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Desde el punto de vista de la seguridad alimenticia existe una amplia preocupaci&oacute;n por las enfermedades de trasmisi&oacute;n alimentaria (ETA), fundamentalmente por la ingesti&oacute;n de pescados y mariscos contaminados con bacterias pat&oacute;genas (SIRVETA 2004) como por ejemplo <i>L. monocytogenes, Salmonella</i> sp, <i>E. coli, S. aureus,</i> en cantidades suficientes para afectar la salud del consumidor (NOM&#45;242&#45;SSA1&#45;2009, Zarei <i>et al.</i> 2012). En muestras de pulpo procedentes de congeladoras de Yucat&aacute;n, M&eacute;xico, se han aislado bacterias pat&oacute;genas como <i>Salmonella, Shigella</i> y <i>E. coli</i> 0157:H7 (Zamudio&#45;Maya <i>et al.</i> 2002). Tambi&eacute;n se ha detectado la prevalencia de bacterias del <i>Phylum</i> Proteobacteria (<i>Vibrio</i> sp, <i>Photobacterium</i> sp) Bacteroidetes y Fusobacteria en este producto pesquero (de la Cruz&#45;Leyva <i>et al.</i> 2011) (<a href="/img/revistas/era/v2n4/a8t2.jpg" target="_blank">Tabla 2</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2">En este contexto <i>V. parahaemolyticus, V. cholerae</i> 0:1 y no 0:1 y <i>V. vulnificus</i> son las principales especies del g&eacute;nero <i>Vibrio</i> ligadas a infecciones provocadas por la ingesti&oacute;n de productos pesqueros (Bauer <i>et al.</i> 2006, DePaola <i>et al.</i> 2003, Ward y Bej 2006).</font></p>  	    <p align="justify"><font face="verdana" size="2">Durante 1999&#45;2000, en Estados Unidos de Am&eacute;rica se registraron brotes relacionados con el consumo de mariscos crudos contaminados con <i>V. parahaemolyticus</i>, esta bacteria produce diarreas coleriformes autolimitadas (DePaola <i>etal.</i> 2003, Ward y Bej 2006). En el per&iacute;odo 2000&#45;2002, <i>Salmonella</i> sp fue el primer agente causal de infecciones alimentarias en Am&eacute;rica Latina, con un 13.39 % de los casos a causa del consumo de pescados y mariscos; durante este mismo per&iacute;odo en M&eacute;xico ocurrieron seis brotes de salmonelosis donde tambi&eacute;n estuvo involucrada la ingesti&oacute;n de productos pesqueros (SIRVETA 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2">En la comercializaci&oacute;n e industrializaci&oacute;n de los pescados y mariscos, algunas especies bacterianas constituyen agentes que pueden causar olores y sabores extra&ntilde;os, formaci&oacute;n de exudados, producci&oacute;n de gases, p&eacute;rdida de color y cambios de textura (Huss 1997), causando el deterioro de los productos y por consiguiente, p&eacute;rdidas econ&oacute;micas.</font></p>  	    <p align="justify"><font face="verdana" size="2">Se han hecho extensivas investigaciones enfocadas al estudio de comunidades bacterianas en diversos productos pesqueros con potencial econ&oacute;mico, a partir de t&eacute;cnicas moleculares de huellas gen&eacute;ticas. Reynisson <i>et al.</i> (2009) estudiaron la sucesi&oacute;n de la composici&oacute;n bacteriana en lomos de bacalao <i>Gadus morhua</i> durante el almacenamiento a bajas temperaturas y en atm&oacute;sfera modificada, utilizando T&#45;RFLP, encontrando que la abundancia relativa de <i>Photobacterium phosphoreum</i> aument&oacute; con el tiempo de almacenamiento; otras especies existentes fueron<i>Pseudomonas</i> sp, el g&eacute;nero <i>Shewanella, Acinetobacter</i> sp, <i>Psychrobacter</i> sp, <i>V. logei, Moritella</i> sp, y <i>Pseudoalteromonas</i> sp. En los productos empaquetados la microflora estuvo dominada por <i>Sphingomonas</i> sp y <i>P. fluorescens</i>, y en menor proporci&oacute;n <i>Variovorax</i> sp y <i>Bradyrhizobium</i> sp. Hovda <i>et al.</i> (2007a) detectaron por PCR&#45;DGGE la presencia de <i>P. phosphoreum, Pseudomonas</i> sp, <i>Shewanella b&aacute;ltica</i> y <i>S. putrefaciens</i> en bacalao <i>G. morhua</i> empaquetado con ozono en condiciones controladas, no encontrando diferencias significativas en la microflora comparada con los controles. En otro estudio similar, donde se caracteriz&oacute; la poblaci&oacute;n bacteriana dominante en halibut <i>hippoglossus</i> de cultivo, envasado en atm&oacute;sfera modificada de C0<sub>2</sub>:N<sub>2</sub> y C0<sub>2</sub>:0<sub>2</sub> se identific&oacute; <i>Brochothrix thermosphact</i>, adem&aacute;s de las especies bacterianas anteriores a excepci&oacute;n de <i>S. b&aacute;ltica</i> (Hovda <i>et al.</i> 2007b).</font></p>  	    <p align="justify"><font face="verdana" size="2">Adicionalmente, en los productos derivados de la pesca se han utilizado los m&eacute;todos de huellas gen&eacute;ticas para revelar la autenticidad de origen de los productos pesqueros (Bossier 1999, Le Nguyen <i>et al.</i> 2008). En este sentido, Le Nguyen <i>et al.</i> (2008) indican que los perfiles de bandeo generados por PCR&#45;DGGE son una herramienta de trazabilidad, debido a que una manera de rastrear el origen de un producto puede ser mediante el an&aacute;lisis global de las comunidades bacterianas de las muestras de alimentos despu&eacute;s de su exportaci&oacute;n.</font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>CONCLUSIONES</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El sector pesquero es una de las actividades econ&oacute;micas con mayor potencial de crecimiento en la producci&oacute;n de alimentos de origen animal. Sin embargo, en los sistemas de cultivo intensivo de peces y mariscos, as&iacute; como en la comercializaci&oacute;n e industrializaci&oacute;n de los productos pesqueros frecuentemente son causa de infecciones e intoxicaciones alimentarias en los seres humanos; debido a enfermedades bacterianas causadas por especies pat&oacute;genas al organismo o desequilibrio en su flora de acompa&ntilde;amiento, lo cual origina p&eacute;rdidas econ&oacute;micas. En este sentido es importante citar que el estudio de la biodiversidad de un determinado ecosistema, como el de los mantos acu&iacute;feros estar&iacute;a incompleto sin la inclusi&oacute;n de los microorganismos, ya que ellos contribuyen de manera esencial al funcionamiento global del planeta y al desarrollo sostenible de la biosfera. Para comprender su funci&oacute;n en sus nichos espec&iacute;ficos, es esencial identificar y cuantificar cada uno de los miembros que conforman la comunidad. Con la aplicaci&oacute;n de t&eacute;cnicas moleculares de huellas de ADN, se ha logrado progresar en el conocimiento de la diversidad bacteriana presente en una comunidad ambiental y ecosistemas alimentarios, tales como los recursos y productos pesqueros. Estudios recientes mencionan que con los m&eacute;todos de cultivo tradicional, los resultados obtenidos sobre comunidades microbianas complejas muestran sesgos importantes, causados por la imposibilidad de cultivar la mayor&iacute;a de las especies microbianas. Sin embargo, mediante m&eacute;todos moleculares independientes de cultivo es posible caracterizar la diversidad a&uacute;n no cultivable, presente en diferentes muestras ambientales. La informaci&oacute;n generada mediante la combinaci&oacute;n de las estrategias de la microbiolog&iacute;a tradicional y los m&eacute;todos moleculares permiten detectar la funci&oacute;n de las comunidades bacterianas en distintos h&aacute;bitad, identificar bacterias funcionales aprovechadas en la biotecnolog&iacute;a y contribuir en el estudio de la calidad de los productos alimenticios. Desde el punto de vista de la seguridad alimentaria, es de alta importancia detectar la flora bacteriana acompa&ntilde;ante de pescados y mariscos con el fin de conocer las bacterias que puedan provocar decremento en la calidad del producto e identificar bacterias pat&oacute;genas que han sido identificadas como responsables de numerosas enfermedades gastrointestinales.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>AGRADECIMIENTOS</b></font></p>  	    <p align="justify"><font face="verdana" size="2">MCCL y JUGC agradecen a la Universidad Ju&aacute;rez Aut&oacute;noma de Tabasco, por su apoyo para la participaci&oacute;n en el programa de fortalecimiento acad&eacute;mico 2007&#45;2010 y al CONACYT por las becas: 164190/164190 y 202232.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>LITERATURA CITADA</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Aguirre&#45;Guzm&aacute;n G, Lara&#45;Flores M, S&aacute;nchez&#45;Mart&iacute;nez JG, Campa&#45;C&oacute;rdova Al, Luna&#45;Gonz&aacute;lez A (2012) The use of probiotics in aquatic organisms: A review. 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