<?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>1870-3453</journal-id>
<journal-title><![CDATA[Revista mexicana de biodiversidad]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Biodiv.]]></abbrev-journal-title>
<issn>1870-3453</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-34532014000200005</article-id>
<article-id pub-id-type="doi">10.7550/rmb.32037</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Biodiversidad de algas planctónicas marinas (Cyanobacteria, Prasinophyceae, Euglenophyta, Chrysophyceae, Dictyochophyceae, Eustigmatophyceae, Parmophyceae, Raphidophyceae, Bacillariophyta, Cryptophyta, Haptophyta, Dinoflagellata) en México]]></article-title>
<article-title xml:lang="en"><![CDATA[Biodiversity of marine planktonic algae (Cyanobacteria, Prasinophyceae, Euglenophyta, Chrysophyceae, Dictyochophyceae, Eustigmatophyceae, Parmophyceae, Raphidophyceae, Bacillariophyta, Cryptophyta, Haptophyta, Dinoflagellata) in Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Becerril]]></surname>
<given-names><![CDATA[David U.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias del Mar y Limnología ]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2014</year>
</pub-date>
<volume>85</volume>
<fpage>S44</fpage>
<lpage>S53</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532014000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532014000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532014000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Este trabajo pretende actualizar la información sobre la biodiversidad de microalgas y protistas del fitoplancton marino en aguas mexicanas. Existe un mayor esfuerzo y literatura disponible para aguas del Pacífico mexicano, mientras que en la porción sur del golfo de México existen pocas obras recientes sobre grupos taxonómicos del fitoplancton. Indudablemente, las diatomeas y los dinoflagelados son los 2 grupos más diversos y dominantes en el fitoplancton marino en México, pero la fracción más pequeña, el picoplancton y ciertos grupos taxonómicos han revelado una diversidad desconocida e inesperada, y una relevancia que se incrementa con estudios modernos. Se siguen anotando nuevos registros en el fitoplancton de aguas mexicanas y se han venido describiendo nuevas especies, sobre todo de diatomeas, dinoflagelados y Parmophyceae. Ciertos grupos deberían ser estudiados con protocolos especializados, ya que son prácticamente desconocidos en México. Se proponen algunas perspectivas de estudio del fitoplancton marino en México para el futuro.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[This paper attempts to provide an updated revision of the biodiversity of the microalgae and protists of the marine phytoplankton in Mexican waters. A higher effort has been given to studies from the Mexican Pacific, considering the available literature, whereas the southern Gulf of Mexico counts with few recent investigations on phytoplanktonic taxonomic groups. Diatoms and dinoflagellates are, with no doubt, the most diverse and dominant phytoplankton groups in Mexico, but the smallest fraction, the picoplankton, and certain groups have revealed an unknown and unexpected diversity, and an increasing importance noticed from recent studies. New records in the marine phytoplankton have been annotated and new species have been described, particularly diatoms, dinoflagellates and Parmophyceae. Certain groups, however, should be systematically studied following specialized protocols, as they are virtually unknown in Mexico. Some future perspectives for the phytoplankton study in Mexico are proposed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[diatomeas]]></kwd>
<kwd lng="es"><![CDATA[dinoflagelados]]></kwd>
<kwd lng="es"><![CDATA[diversidad]]></kwd>
<kwd lng="es"><![CDATA[fitoplancton marino]]></kwd>
<kwd lng="es"><![CDATA[microalgas]]></kwd>
<kwd lng="en"><![CDATA[diatoms]]></kwd>
<kwd lng="en"><![CDATA[dinoflagellates]]></kwd>
<kwd lng="en"><![CDATA[diversity]]></kwd>
<kwd lng="en"><![CDATA[marine phytoplankton]]></kwd>
<kwd lng="en"><![CDATA[microalgae]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="Verdana" size="4">Art&iacute;culos</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Biodiversidad de algas planct&oacute;nicas marinas (Cyanobacteria, Prasinophyceae, Euglenophyta, Chrysophyceae, Dictyochophyceae, Eustigmatophyceae, Parmophyceae, Raphidophyceae, Bacillariophyta, Cryptophyta, Haptophyta, Dinoflagellata) en M&eacute;xico</b></font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Biodiversity of marine planktonic algae (Cyanobacteria, Prasinophyceae, Euglenophyta, Chrysophyceae, Dictyochophyceae, Eustigmatophyceae, Parmophyceae, Raphidophyceae, Bacillariophyta, Cryptophyta, Haptophyta, Dinoflagellata) in Mexico</b></font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>David U. Hern&aacute;ndez&#45;Becerril</b></font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Instituto de Ciencias del Mar y Limnolog&iacute;a, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apartado postal 70&#45;305. Cd. Universitaria, Coyoac&aacute;n, 04510 M&eacute;xico, D. F. M&eacute;xico.</i> <a href="mailto:dhernand@cmarl.unam.mx">dhernand@cmarl.unam.mx</a></font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido: 05 junio 2012    <br>Aceptado: 18 septiembre 2012</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Este trabajo pretende actualizar la informaci&oacute;n sobre la biodiversidad de microalgas y protistas del fitoplancton marino en aguas mexicanas. Existe un mayor esfuerzo y literatura disponible para aguas del Pac&iacute;fico mexicano, mientras que en la porci&oacute;n sur del golfo de M&eacute;xico existen pocas obras recientes sobre grupos taxon&oacute;micos del fitoplancton. Indudablemente, las diatomeas y los dinoflagelados son los 2 grupos m&aacute;s diversos y dominantes en el fitoplancton marino en M&eacute;xico, pero la fracci&oacute;n m&aacute;s peque&ntilde;a, el picoplancton y ciertos grupos taxon&oacute;micos han revelado una diversidad desconocida e inesperada, y una relevancia que se incrementa con estudios modernos. Se siguen anotando nuevos registros en el fitoplancton de aguas mexicanas y se han venido describiendo nuevas especies, sobre todo de diatomeas, dinoflagelados y Parmophyceae. Ciertos grupos deber&iacute;an ser estudiados con protocolos especializados, ya que son pr&aacute;cticamente desconocidos en M&eacute;xico. Se proponen algunas perspectivas de estudio del fitoplancton marino en M&eacute;xico para el futuro.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> diatomeas, dinoflagelados, diversidad, fitoplancton marino, microalgas.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">This paper attempts to provide an updated revision of the biodiversity of the microalgae and protists of the marine phytoplankton in Mexican waters. A higher effort has been given to studies from the Mexican Pacific, considering the available literature, whereas the southern Gulf of Mexico counts with few recent investigations on phytoplanktonic taxonomic groups. Diatoms and dinoflagellates are, with no doubt, the most diverse and dominant phytoplankton groups in Mexico, but the smallest fraction, the picoplankton, and certain groups have revealed an unknown and unexpected diversity, and an increasing importance noticed from recent studies. New records in the marine phytoplankton have been annotated and new species have been described, particularly diatoms, dinoflagellates and Parmophyceae. Certain groups, however, should be systematically studied following specialized protocols, as they are virtually unknown in Mexico. Some future perspectives for the phytoplankton study in Mexico are proposed.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words:</b> diatoms, dinoflagellates, diversity, marine phytoplankton, microalgae.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">En los &uacute;ltimos a&ntilde;os, en los que ha existido un creciente deterioro del medio ambiente en todo el mundo, principalmente por actividades humanas, el conocimiento de la biodiversidad de las comunidades marinas de microorganismos ha adquirido una gran importancia. Una comunidad singular por su naturaleza y papel funcional en el ecosistema pel&aacute;gico es el fitoplancton marino, constituido por especies de linajes algales y protistas, muy diversas en tallas y formas.</font></p>     <p align="justify"><font face="verdana" size="2">La importancia del fitoplancton marino ha sido enfatizada en diversas obras en todo el mundo, ya que es responsable de m&aacute;s de 45% de la producci&oacute;n primaria neta del planeta (Falkowsky et al., 2004; Simon et al., 2009). Adem&aacute;s se puede mencionar el papel de casi cada grupo de microalgas y protistas fitoplanct&oacute;nicos en los grandes temas de actualidad que preocupan a la sociedad humana y que tienen que ver con el agua (recursos acu&aacute;ticos, contaminaci&oacute;n, indicadores de la calidad), la biodiversidad (conocimiento, mantenimiento, uso, valor, amenaza) y el cambio clim&aacute;tico (especies invasoras, incremento de especies productoras de toxinas, acidificaci&oacute;n de los oc&eacute;anos) (Hallegraeff, 2010; Fioroni et al., 2011).</font></p>     <p align="justify"><font face="verdana" size="2">Casi cada clase taxon&oacute;mica de algas y protistas est&aacute; representado en el fitoplancton marino, ya sea desde organismos procariotas (Cyanobacteria), organismos eucariotas del gran clado llamado Chromalveolata, considerando Stramenopiles (Heterokontas y parientes), Cryptophyta, Haptophyta y Dinoflagellata, hasta grupos taxon&oacute;micos de algas verdes (Chlorophyta, con sus clases Chlorophyceae y Prasinophyceae, y Euglenophyta) (Simon et al., 2009). La categor&iacute;a de talla en el fitoplancton marino ha adquirido gran relevancia, ya que muchos estudios recientes han mostrado las diferentes contribuciones a la biomasa y productividad de ciertas fracciones, como microplancton (mayores de 20 &micro;m), nanoplancton (entre 2 y 20 &micro;m) y picoplancton (menores de 2 &micro;), y han descubierto una diversidad inesperada, sobre todo en los organismos de tallas m&aacute;s peque&ntilde;as (picoplancton), utilizando herramientas moleculares (Guillou et al., 2004; Pedr&oacute;s&#45;Ali&oacute;, 2006; Vaulot et al., 2008).</font></p>     <p align="justify"><font face="verdana" size="2">Algunos autores han mencionado que las diatomeas (Bacillariophyta), los dinoflagelados (Dinoflagellata), las Haptophyta y las algas verdes (Chlorophyta) podr&iacute;an contar aproximadamente por el 40, 40, 10 y 6% de las especies de eucariotas presentes en el fitoplancton marino actual, mientras que la suma de otros grupos contribuir&iacute;a un 2% (Simon et al., 2009), aunque existe informaci&oacute;n adicional indicando una mayor diversidad de diatomeas en el fitoplancton marino, con cerca de 5 000 especies (Katz et al., 2004).</font></p>     <p align="justify"><font face="verdana" size="2">A pesar de los m&uacute;ltiples y diferentes enfoques sobre el concepto de especie en microalgas y protistas que constituyen el fitoplancton marino, y que usualmente incluyen el concepto morfol&oacute;gico (e.g. basado en caracter&iacute;sticas morfol&oacute;gicas), el concepto filogen&eacute;tico (e.g. basado en caracteres moleculares) y el concepto biol&oacute;gico de especie (e.g. basado en aspectos de reproducci&oacute;n sexual, hibridaci&oacute;n y descendencia f&eacute;rtil, que en organismos fitoplanctontes son muy dif&iacute;ciles de identificar) (Amato et al., 2007; Simon et al., 2009), en este trabajo se utilizar&aacute; fundamentalmente el concepto de morfoespecie, que es al m&aacute;s cotidiano y ampliamente usado. Existe una clara dominancia de las fases vegetativas sobre estadios sexuales en especies de fitoplancton (von Dassow y Montresor, 2011). Sin embargo, el t&eacute;rmino y concepto de especies cr&iacute;pticas (e.g. especies con caracter&iacute;sticas morfol&oacute;gicas id&eacute;nticas o muy similares, pero con caracteres moleculares distintos), se considera en esta revisi&oacute;n (Lundholm et al., 2003; Sarno et al., 2005; Smayda, 2011).</font></p>     <p align="justify"><font face="verdana" size="2">En 1993 apareci&oacute; un primer acercamiento a la biodiversidad del fitoplancton marino en M&eacute;xico (Hern&aacute;ndez&#45;Becerril, 1993), que continu&oacute; 10 a&ntilde;os m&aacute;s tarde, con un recuento de los grupos taxon&oacute;micos y sus especies presentes en aguas mexicanas (Hern&aacute;ndez&#45;Becerril, 2003). A lo largo de esos &uacute;ltimos 10 a&ntilde;os, se han incrementado notablemente los trabajos en M&eacute;xico y todo el mundo que han contribuido al conocimiento sobre la biodiversidad del fitoplancton marino, o de sus grupos taxon&oacute;micos (e.g. Alonso&#45;Rodr&iacute;guez et al., 2009; Hoppenrath et al., 2009; Esqueda&#45;Lara y Hern&aacute;ndez&#45;Becerril, 2010; Kraberg et al., 2010). Este trabajo pretende actualizar la informaci&oacute;n y conocer el estado&#45;del&#45;arte de la biodiversidad de esta importante comunidad en aguas marinas mexicanas.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Diversidad</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Dentro del fitoplancton marino, algunos c&aacute;lculos indican un n&uacute;mero entre 3 444 y 4 375 especies reconocidas (Sournia et al., 1991), de entre 3 365 y 4 024 especies (Sournia, 1995) y cerca de 5 000 especies (Tett y Barton, 1995; Simon et al., 2009). En M&eacute;xico, un n&uacute;mero estimado de taxones (especies, formas y variedades) se aproxima a 1 488, incluidos en 211 g&eacute;neros, que representa 33&#45;42% del total calculado para todo el mundo (Hern&aacute;ndez&#45;Becerril, 2003), aunque hay que considerar las investigaciones m&aacute;s recientes (ver abajo).</font></p>     <p align="justify"><font face="verdana" size="2">A continuaci&oacute;n, se describen de manera muy general las caracter&iacute;sticas morfol&oacute;gicas de los distintos grupos taxon&oacute;micos que componen el fitoplancton marino y de los cuales existe informaci&oacute;n reciente en aguas mexicanas.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Cyanobacteria.</i> Son organismos procariotas ancestrales, fotosint&eacute;ticos y relativamente sencillos, cuyas formas en el fitoplancton marino pueden ser filamentosas en cadena (tricomas), cadenas de c&eacute;lulas cocoides o c&eacute;lulas esf&eacute;ricas, y pertenecen al microplancton o al picoplancton, debido a sus diferentes tallas. Algunas de sus especies son los organismos m&aacute;s abundantes en el planeta y contribuyen de manera importante a la productividad planct&oacute;nica marina y a los ciclos de carbono y nitr&oacute;geno, mientras que otras especies est&aacute;n asociadas de manera simbi&oacute;tica con organismos eucariotes, y otras producen toxinas de inter&eacute;s en la salud humana y la fauna marina (Hawser et al., 1992). Se han considerado pocos g&eacute;neros de Cyanobacteria en el fitoplancton marino actual (Pearl, 2000), y entre 7&#45;10 especies, aunque se sigue debatiendo la existencia de "razas" fisiol&oacute;gicas de ciertas especies picoplanct&oacute;nicas (Ahlgren y Rocap, 2006).</font></p>     <p align="justify"><font face="verdana" size="2">En aguas mexicanas de ambos litorales se han reconocido especies de los g&eacute;neros <i>Prochlorococcus</i> y <i>Synechococcus</i>, tanto por observaciones directas en microscopio, como por el uso de ciertos equipos (citometr&iacute;a de flujo, HPLC) (Hern&aacute;ndez&#45;Becerril et al., 2012a) o de herramientas moleculares, as&iacute; como las especies <i>Richelia intracellularis</i> y 3&#45;4 especies del g&eacute;nero <i>Trichodesmium</i> (Hern&aacute;ndez&#45;Becerril, 2003; Aldeco et al., 2009) (<a href="/img/revistas/rmbiodiv/v85sene/a5f1.jpg" target="_blank">Fig. 8</a>).</font></p>     <p align="justify"><font face="verdana" size="2"><i>Chlorophyta</i>. Prasinophyceae. Este grupo est&aacute; compuesto de microalgas verdes ancestrales, fotosint&eacute;ticas, unicelulares, con una gran variedad de formas (desde cocoides, ovoides, hasta en forma de coraz&oacute;n), y tallas (pertenecientes al nano o picoplancton), con o sin flagelos y en general con escamas org&aacute;nicas externas muy ornamentadas. Se han reconocido unas 103&#45;136 especies en el fitoplancton marino (Sournia, 1995). La especie <i>Ostreococcus tauri</i>, perteneciente a este grupo, es el organismo eucariota m&aacute;s peque&ntilde;o del mundo (Chr&eacute;tiennot&#45;Dinet et al., 1995).</font></p>     <p align="justify"><font face="verdana" size="2">En el Pac&iacute;fico mexicano podemos contar las siguientes especies: <i>Micromonas pusilla</i>, <i>Nephroselmis olivacea</i>, <i>Pyramimonas orientalis</i>, <i>P</i>. <i>cordata</i> y <i>Resultor mikron</i> (L&oacute;pez Tachiqu&iacute;n, 2002), mientras que hay evidencia de poblaciones importantes de <i>Micromonas pusilla</i> en el sur del Golfo de M&eacute;xico (Hern&aacute;ndez&#45;Becerril et al., 2012a). Faltan muchos estudios detallados de este grupo en M&eacute;xico, sobre todo de especies de <i>Pyramimonas</i> y de Prasinophyceae picoplanct&oacute;nicos (Guillou et al., 2004).</font></p>     <p align="justify"><font face="verdana" size="2"><i>Euglenophyta.</i> Las formas planct&oacute;nicas marinas de este grupo son flageladas, fusiformes, fotosint&eacute;ticas o heter&oacute;trofas. Presentan una pel&iacute;cula externa que les confiere plasticidad y uno o 2 flagelos que se insertan en la faringe, en la porci&oacute;n anterior. Aunque no son muy comunes ni abundantes, suelen ser indicadoras de contaminaci&oacute;n costera. Los registros actuales indican la presencia de 36&#45;37 especies en el fitoplancton marino (Sournia, 1995).</font></p>     <p align="justify"><font face="verdana" size="2">Varios estudios no publicados, sobre todo en aguas del Pac&iacute;fico mexicano, dan cuenta de la ocurrencia de especies de los g&eacute;neros <i>Euglena</i>, <i>Eutreptia</i> y <i>Eutreptiella</i>. Es claro que hacen falta investigaciones sistematizadas sobre este grupo, para conocer no s&oacute;lo su biodiversidad, sino su distribuci&oacute;n y papel funcional.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Heterokontophyta.</i> Chrysophyceae. Comprende un grupo relativamente peque&ntilde;o de microalgas Heterokontas unicelulares, de formas cocoides, con o sin flagelos y usualmente m&oacute;viles, tanto fotosint&eacute;ticas como hetr&oacute;trofas. Est&aacute;n presentes en ambientes continentales y marinos, aunque hay pocas especies en el plancton marino (96&#45;126 especies, Sournia, 1995), entre ellas algunas formas picoplanct&oacute;nicas (Vaulot et al., 2008; Simon et al., 2009).</font></p>     <p align="justify"><font face="verdana" size="2">Hay pocos registros confiables de especies de este grupo, pero se ha documentado la presencia de <i>Meringosphaera mediterranea</i> en el Pac&iacute;fico mexicano (L&oacute;pez Tachiqu&iacute;n, 2002). Algunos estudios sin publicar, en otras regiones del mundo, muestran la presencia de especies heter&oacute;trofas de este grupo, que podr&iacute;an ocurrir tambi&eacute;n en aguas mexicanas, por lo que es necesario estudiar este grupo.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>Dictyochophyceae.</i> Este grupo comprende especies Heterokontas unicelulares, incluyendo silicoflagelados y sus parientes, que son casi exclusivamente planct&oacute;nicos y marinos, en sus formas fotosint&eacute;ticas y heter&oacute;trofas. Los silicoflagelados se distinguen por tener un exoesqueleto sil&iacute;ceo que contiene al protoplasma y un solo flagelo. Se conocen un gran n&uacute;mero de especies extintas de silicoflagelados y se debate cu&aacute;ntas especies vivientes podr&iacute;an existir en los mares mundiales, que var&iacute;an de 1&#45;3 (Moestrup, 1995; Kristiansen y Preisig, 2001) hasta 8 taxa (Throndsen, 1997; Hern&aacute;ndez&#45;Becerril y Bravo&#45;Sierra, 2001). <i>Florenciella parvula</i> es una especie descrita recientemente, de talla nanoplanct&oacute;nica (Eikrem et al., 2004), mientras que <i>Pseudochattonella verruculosa</i> y <i>Pseudochattonella farcimen</i> son 2 especies de Dyctyochophyceae recientemente caracterizadas, que forman proliferaciones t&oacute;xicas para los peces (Riisberg y Edvardsen, 2008).</font></p>     <p align="justify"><font face="verdana" size="2">En aguas del Pac&iacute;fico mexicano se pueden contar hasta 7 taxones de silicoflagelados, todos pertenecientes al g&eacute;nero <i>Dictyocha</i> (Hern&aacute;ndez&#45;Becerril y Bravo&#45;Sierra, 2001; Hern&aacute;ndez&#45;Becerril, 2003) (<a href="/img/revistas/rmbiodiv/v85sene/a5f1.jpg" target="_blank">Fig. 7</a>). Otros grupos de Dictyochophyceae deber&iacute;an ser estudiados con detalle.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Eustigmatophyceae.</i> El grupo contiene pocas especies de microalgas Heterokontas, fotosint&eacute;ticas, cocoides, sin flagelos aparentes y con un estigma. S&oacute;lo se han reconocido 3 especies en el fitoplancton marino (Sournia, 1995). Aparentemente, se han reconocido especies del g&eacute;nero <i>Nannochloropsis</i> en aguas mexicanas (Hern&aacute;ndez&#45;Becerril, 2003), y hay informaci&oacute;n no publicada de altas densidades de 1 o 2 especies del g&eacute;nero en el Pac&iacute;fico central mexicano.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Parmophyceae.</i> Son algas Heterokontas, con afinidad a la clase Bolidophyceae y a las diatomeas (Ichinomiya et al., 2010). Existen pocas especies, todas planct&oacute;nicas marinas de tallas generalmente menores de 5 &micro;m, cocoides y sin flagelos aparentes, con una cubierta r&iacute;gida de s&iacute;lice, compuesta por un n&uacute;mero de placas de varias formas. Se anotan alrededor de 20 taxa (especies y categor&iacute;as infraespec&iacute;ficas) (Konno et al., 2007) en aguas de todo el mundo. En el Pac&iacute;fico mexicano se han registrado 3 taxa: <i>Tetraparma insecta</i> (<a href="/img/revistas/rmbiodiv/v85sene/a5f1.jpg" target="_blank">Fig. 5</a>), <i>Triparma laevis</i> var. <i>mexicana</i> y <i>T</i>. <i>retinervis</i>, de las cuales la primera fue descrita originalmente en aguas marinas mexicanas, el Golfo de Tehuantepec (Bravo&#45;Sierra y Hern&aacute;ndez&#45;Becerril, 2003).</font></p>     <p align="justify"><font face="verdana" size="2"><i>Raphidophyceae.</i> Son microalgas Heterokontas flageladas (2 flagelos desiguales insertados en la porci&oacute;n subapical), unicelulares, m&oacute;viles y delicadas (sin cubierta r&iacute;gida), con m&aacute;s afinidad al plancton marino. En general son formas fotosint&eacute;ticas, con algunas especies donde se ha detectado mixotrof&iacute;a, que pueden producir grandes proliferaciones poblacionales y toxinas que afectan a peces. Se reconocen 11&#45;12 especies del grupo (Sournia, 1995).</font></p>     <p align="justify"><font face="verdana" size="2">En M&eacute;xico, particularmente en el Pac&iacute;fico, se han registrado las especies <i>Chattonella marina</i>, <i>Chattonella</i> cf. <i>ovata</i>, <i>Fibrocapsa japonica</i> (<a href="/img/revistas/rmbiodiv/v85sene/a5f1.jpg" target="_blank">Fig. 6</a>) y <i>Heterosigma akashiwo</i> (Band&#45;Schmidt et al., 2004); recientemente se ha informado de ciertas proliferaciones causadas por ciertas especies y asociadas con mortandad de peces (Cort&eacute;s&#45;Altamirano et al., 2006).</font></p>     <p align="justify"><font face="verdana" size="2"><i>Bacillariophyta.</i> Las diatomeas son un grupo taxon&oacute;mico de eucariotas unicelulares cuya caracter&iacute;stica m&aacute;s importante es la presencia de una pared sil&iacute;cea que puede tener multitud de variaciones morfol&oacute;gicas y ser muy ornamentada (<i>Minidiscus comicus</i>, una diatomea picoplanct&oacute;nica, <a href="/img/revistas/rmbiodiv/v85sene/a5f1.jpg" target="_blank">Fig. 1</a>), y que representan el grupo de aut&oacute;trofos m&aacute;s exitoso en el ambiente pel&aacute;gico, tanto por su gran diversidad de formas y especies, como por su importante contribuci&oacute;n a la productividad global (Kooistra et al., 2007). El n&uacute;mero aproximado de especies planct&oacute;nicas actuales es de 1 300&#45;1 700 (Sournia, 1995), aunque existe un c&aacute;lculo de unas 5 000 especies (Katz et al., 2004).</font></p>     <p align="justify"><font face="verdana" size="2">Para aguas del Pac&iacute;fico mexicano se han listado 864 taxones de diatomeas planct&oacute;nicas marinas, incluyendo muchas formas ticoplanct&oacute;nicas (Meave et al., 2003), alrededor de 1 000 taxones para el todo el Golfo de M&eacute;xico (incluyendo formas bent&oacute;nicas) (Krayesky et al., 2009), y unos 255 taxones en el sur del Golfo de M&eacute;xico, con numerosos nuevos registros (Licea et al., 2011). Recientemente se han descrito especies nuevas de diatomeas planct&oacute;nicas marinas en aguas del Pac&iacute;fico mexicano, como <i>Pseudonitzschia roundii</i>, y las ticoplanct&oacute;nicas <i>Cerataulus simsae</i> y <i>Fryxelliella pacifica</i> (Hern&aacute;ndez&#45;Becerril y D&iacute;az&#45;Almeida, 2006; Hern&aacute;ndez&#45;Becerril y Bar&oacute;n&#45;Campis, 2008; Hern&aacute;ndez&#45;Becerril et al., 2012b). Existen nuevos registros, al menos en el Pac&iacute;fico mexicano, incluyendo 4 especies del g&eacute;nero <i>Nitzschia</i>, 3 del g&eacute;nero <i>Pseudonitzschia</i> (Hern&aacute;ndez&#45;Becerril y D&iacute;az&#45;Almeyda, 2006; Quijano&#45;Scheggia et al., 2011), y las especies <i>Rhizosolenia decipiens</i>, <i>Rhizosolenia fallax</i> y <i>Thalassiosira delicatula</i> (Hern&aacute;ndez&#45;Becerril et al., 2009, 2010a), entre otras.</font></p>     <p align="justify"><font face="verdana" size="2">Los estudios de biodiversidad recomendados para las diatomeas planct&oacute;nicas marinas incluyen la descripci&oacute;n de nuevas especies, los complejos de especies cr&iacute;pticas (e.g. <i>Pseudonitzschia</i>, <i>Skeletonema</i>, etc.) y la filogenia y biogeograf&iacute;a de las asociaciones y comunidades actuales.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Cryptophyta.</i> Microalgas unicelulares, m&oacute;viles, ovoides y asim&eacute;tricas, que son generalmente fotosint&eacute;ticas (solo 2 g&eacute;neros son heter&oacute;trofos). Tienen 2 flagelos similares, insertados en la porci&oacute;n apical o subapical, un periplasto externo, estructuras que descargan (eyectosomas), y un nucleomorfo (e.g. n&uacute;cleo vestigial) interno. Las especies en el fitoplancton marino var&iacute;an entre 57&#45;73 (Sournia, 1995), aunque tambi&eacute;n se ha mencionado la cifra de 100 especies actuales (Cerino y Zingone, 2007). Hay informaci&oacute;n sin publicar que indica la presencia de especies de los g&eacute;neros: <i>Hemiselmis</i> y <i>Rhodomonas</i> (Hern&aacute;ndez&#45;Becerril, 2003). Son urgentes los trabajos sobre las especies de este grupo taxon&oacute;mico, que podr&iacute;a adquirir gran importancia ecol&oacute;gica en amplias zonas oce&aacute;nicas.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>Haptophyta.</i> Es un grupo de microalgas flageladas con una estructura adicional parecida a un tercer flagelo, el haptonema, que presentan escamas org&aacute;nicas o mineralizadas (carbonato de calcio o s&iacute;lice) y son muy comunes y diversas en el fitoplancton marino de todo el mundo, particularmente los cocolitof&oacute;ridos. Casi todas las especies son fotosint&eacute;ticas, pero hay formas mix&oacute;trofas. El n&uacute;mero de especies totales se calcula en 350 (Adl et al., 2007), mientras que en el fitoplancton marino se han listado 244&#45;303 especies (Sournia, 1995), de las cuales se pueden considerar unas 280 especies de cocolitof&oacute;ridos actuales (Young et al., 2003).</font></p>     <p align="justify"><font face="verdana" size="2">Se han podido listar unos 58 taxones de cocolitof&oacute;ridos en el Pac&iacute;fico mexicano y Golfo de M&eacute;xico (Hern&aacute;ndez&#45;Becerril et al., 2001, 2008a) (<i>Gephyrocapsa oceanica</i>, <a href="/img/revistas/rmbiodiv/v85sene/a5f1.jpg" target="_blank">Fig. 3</a>), adem&aacute;s se han registrado la ocurrencia de <i>Phaeocystis pouchetii</i> (L&oacute;pez Tachiqu&iacute;n, 2002) y especies de <i>Chrysochromulina</i> (<a href="/img/revistas/rmbiodiv/v85sene/a5f1.jpg" target="_blank">Fig. 4</a>). Se sugieren estudios complementarios de cocolitof&oacute;ridos, utilizando posibilidades de cultivo, as&iacute; como de las especies con escamas org&aacute;nicas y sil&iacute;ceas (e.g. <i>Chrysochromulina</i>, <i>Hyalolithus</i>, etc.), y las potencialmente t&oacute;xicas y nocivas (e.g. <i>Prymnesium</i>, <i>Phaeocystis</i>, etc.)</font></p>     <p align="justify"><font face="verdana" size="2"><i>Chlorarachniophyta.</i> Este peque&ntilde;o grupo taxon&oacute;mico est&aacute; constituido por microalgas exclusivamente marinas, unicelulares, generalmente fotosint&eacute;ticas, ameboides, cocoides o flageladas, con cloroplastos rodeados de 4 membranas, clorofilas <i>a</i> y <i>b</i>, y la presencia de un nucleomorfo. Se han reconocido solamente 1&#45;2 especies en el fitoplancton marino actual (Sournia, 1995; Simon et al., 2009), aunque se han citado 5 g&eacute;neros y 9 especies (Ishida et al., 2007), y se han venido describiendo nuevos g&eacute;neros y especies en los &uacute;ltimos a&ntilde;os (Ota et al., 2007a, 2009). La &uacute;nica especie reconocida para aguas mexicanas (Baja California Sur) es <i>Norrisiella sphaerica</i> (Ota et al., 2007b). De lo anterior, se anota la carencia de trabajos sobre este grupo y la urgencia de incrementar su conocimiento en el plazo inmediato.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Dinoflagellata.</i> Los dinoflagelados son protistas alveolados (Alveolata) unicelulares que pueden formar cadenas, cenocitos o filamentos, en general poseen 2 flagelos de forma y funci&oacute;n diferente, y pueden ser formas fotosint&eacute;ticas, mix&oacute;trofas, heter&oacute;trofas o par&aacute;sitas (<i>Protoperidinium depressum</i>, <a href="/img/revistas/rmbiodiv/v85sene/a5f1.jpg" target="_blank">Fig. 2</a>). Algunas especies planct&oacute;nicas marinas producen altas proliferaciones poblacionales y/o toxinas que causan padecimientos a la fauna marina y a los humanos. Es el grupo taxon&oacute;mico m&aacute;s diverso y que contribuye m&aacute;s a la biomasa y productividad planct&oacute;nica, despu&eacute;s de las diatomeas. La diversidad de especies actuales en el plancton marino var&iacute;a de 1 514&#45;1 880 (Sournia, 1995), 1 555 (G&oacute;mez, 2005), hasta cerca de 2 000 especies (Adl et al., 2007; Taylor et al., 2008).</font></p>     <p align="justify"><font face="verdana" size="2">Recientemente se han publicado una lista de dinoflagelados del orden Dinophysales en aguas marinas mexicanas, que incluye 90 taxones (Hern&aacute;ndez&#45;Becerril et al., 2003), estudios del g&eacute;nero <i>Protoperidinium</i> tanto en el Pac&iacute;fico mexicano como en el sur del Golfo de M&eacute;xico, que indica 101 taxones y 46 especies estudiadas de ese g&eacute;nero en esas zonas, respectivamente (Okolodkov, 2005, 2008), as&iacute; como un trabajo elaborado en el Pac&iacute;fico mexicano que ha listado 605 taxones (especies y taxones infraespec&iacute;ficos), dentro de 91 g&eacute;neros de dinoflagelados principalmente planct&oacute;nicos marinos (Okolodkov y G&aacute;rate&#45;Liz&aacute;rraga, 2006). En la porci&oacute;n mexicana del Golfo de M&eacute;xico se han registrado 252 especies de dinoflagelados (Licea et al., 2004), mientras que para todo el Golfo de M&eacute;xico se han encontrado 644 taxones de dinoflagelados (casi todos planct&oacute;nicos) (Steidinger et al., 2009). Se han descrito algunas nuevas especies de dinoflagelados planct&oacute;nicos marinos en el Pac&iacute;fico mexicano, como <i>Amphisolenia fusiformis, Amphisolenia michoacana</i>, <i>Ceratium balechii</i>, <i>Dinophysis siankanensis</i> (Almaz&aacute;n&#45;Becerril y Hern&aacute;ndez&#45;Becerril, 2002; Meave et al., 2003; Hern&aacute;ndez&#45;Becerril et al., 2008b). Tambi&eacute;n se han anotado varios nuevos registros en el Pac&iacute;fico mexicano (Hern&aacute;ndez&#45;Becerril y Bravo&#45;Sierra, 2004a, 2004b; Okolodkov y G&aacute;rate Liz&aacute;rraga, 2006; G&aacute;rate&#45;Liz&aacute;rraga y Verdugo&#45;D&iacute;az, 2007; G&aacute;rate&#45;Liz&aacute;rraga, 2008, 2009; Hern&aacute;ndez&#45;Becerril et al., 2010b; G&aacute;rate&#45;Liz&aacute;rraga et al., 2011) y el sur del Golfo de M&eacute;xico (Parra&#45;Toriz et al., 2012), incluyendo especies raras o interesantes como <i>Ceratium dens</i>, <i>Dinofurcula ultima</i>, <i>Heterocapsa pygmaea</i> y <i>Phalacroma turbineum</i>, la primera considerada tradicionalmente de distribuci&oacute;n exclusivamente Indo&#45;Pac&iacute;fica, mientras que la segunda y &uacute;ltima fueron detectadas despu&eacute;s de casi 100 a&ntilde;os de su descripci&oacute;n original. Asimismo, Esqueda&#45;Lara y Hern&aacute;ndez&#45;Becerril (2010) elaboraron una flora de dinoflagelados del Pac&iacute;fico central mexicano y documentaron la presencia de 2 nuevos registros. Sin embargo, a pesar de los esfuerzos para estudiar la biodiversidad de los dinoflagelados planct&oacute;nicos marinos, se deber&iacute;an seguir estudiando intensamente ciertos grupos, particularmente dinoflagelados de tecas delicadas o delgadas ("thin&#45;walled"), dinoflagelados desnudos y especies del orden Dinophysales, que requieren an&aacute;lisis morfol&oacute;gicos y filogen&eacute;ticos.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Otros grupos taxon&oacute;micos.</i> Existen varios grupos taxon&oacute;micos presentes en el fitoplancton marino de todo el mundo, pero no reconocidos actualmente en M&eacute;xico, como: Rhodophyceae, representado por 6 especies (Sournia, 1995); Bolidophyceae, clase taxon&oacute;mica constituida por formas picoplanct&oacute;nicas, con un s&oacute;lo g&eacute;nero (<i>Bolidomonas</i>) y 2 especies (Guillou et al., 1999); Pelagophyceae, que contiene algunas especies picoplanct&oacute;nicas de amplia distribuci&oacute;n y creciente importancia, como <i>Aureococcus anophagefferens</i>, <i>Aureoumbra lagunensis</i>, <i>Pelagococcus subviridis</i> y <i>Pelagomonas calceolata</i> (Andersen et al., 1993); Pinguiophyceae, de reciente descripci&oacute;n, incluyendo 5 g&eacute;neros y 5 especies variables en tallas y formas, con alto contenido en &aacute;cidos grasos y omega3 (Kawachi et al., 2002); y Tribophyceae, grupo que cuenta con unas 9&#45;13 especies (Sournia, 1995). El estudio sistem&aacute;tico de varios de estos grupos implica observaciones en vivo, establecimiento de cultivos, uso de t&eacute;cnicas y protocolos particulares y de equipos especializados, y empleo de m&eacute;todos de biolog&iacute;a molecular.</font></p>     <p align="justify"><font face="verdana" size="2"><i>Perspectivas.</i> De la informaci&oacute;n y datos aportados, resulta evidente que los grupos m&aacute;s diversos y mejor conocidos en el fitoplancton marino de M&eacute;xico son las diatomeas y los dinoflagelados, y que recientemente se comienzan a estudiar ciertos otros grupos de flagelados o picoplanct&oacute;nicos, destacando los cocolitof&oacute;ridos (Haptophyta). Esto indudablemente que nos remite a la proporci&oacute;n anotada anteriormente sobre los porcentajes de especies reconocidas pertenecientes a los diferentes grupos taxon&oacute;micos propuestos por algunos autores (e.g. Simon et al., 2009). Si el n&uacute;mero de aproximadamente 1 488 taxones reconocidos en aguas mexicanas (que representan 33&#45;42% del total de especies calculado para el fitoplancton en todo el mundo) es confiable (Hern&aacute;ndez&#45;Becerril, 2003), deberemos a&ntilde;adir tanto los nuevos registros como las nuevas especies descritas en los &uacute;ltimos a&ntilde;os, algunos de los cuales han sido referidos aqu&iacute; en este trabajo.</font></p>     <p align="justify"><font face="verdana" size="2">Los estudios de ciclos e historias de vida adquieren cada d&iacute;a m&aacute;s importancia, ya que en muchos casos nos ayudan a entender la ecolog&iacute;a e historia natural de las especies. Las poblaciones de una especie particular de fitoplancton en muestras naturales pueden contener c&eacute;lulas en diferentes fases de vida, con fuerte diferenciaci&oacute;n en fisiolog&iacute;a y diferentes papeles funcionales, a&uacute;n cuando sean id&eacute;nticas gen&eacute;ticamente (von Dassow y Montresor, 2011). Con el desarrollo y empleo cada vez m&aacute;s cotidiano de cultivos de microalgas y protistas planct&oacute;nicos, existe un respaldo suficiente para estudios de morfolog&iacute;a, fisiolog&iacute;a, gen&eacute;tica, filogenia molecular y ciclos de vida (desarrollo de estadios sexuales, producci&oacute;n de auxosporas, esporas, quistes) (e.g. Hern&aacute;ndez&#45;Becerril et al., 2010b). En estos tiempos es muy recomendable contar con colecciones de cultivos, as&iacute; como de colecciones de muestras preservadas.</font></p>     <p align="justify"><font face="verdana" size="2">Diversas herramientas moleculares se vienen usando regularmente y con mayor intensidad para el reconocimiento de especies, sobre todo las pertenecientes a complejos de especies incluyendo especies cr&iacute;pticas o de tallas muy peque&ntilde;as (picoplancton), lo que implica la consideraci&oacute;n del concepto de especie filogen&eacute;tico (e.g. Marin y Melkonian, 2010; Medlin y Schmidt, 2010; Smayda, 2011). Sin embargo, no se debe soslayar la importancia de estudiar la variaci&oacute;n morfol&oacute;gica y posibles l&iacute;mites, en t&eacute;rminos morfol&oacute;gicos, de las especies.</font></p>     <p align="justify"><font face="verdana" size="2">Recientemente se han identificado especies y grupos de especies indicadores de cambio clim&aacute;tico global (Tunin&#45;Ley et al., 2009) o como invasoras debido a este cambio o a las actividades humanas (e.g. eutrofizaci&oacute;n cultural, comercio mar&iacute;timo &#45; aguas de lastre de barcos&#45;, entre otras). Ya es evidente que hay variaciones importantes del medioambiente causadas por el cambio clim&aacute;tico, y que amenaza seriamente la biodiversidad de las comunidades de microorganismos (Boyce et al., 2010).</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Para considerar la presencia de especies de fitoplancton invasivas o invasoras debemos contar con registros hist&oacute;ricos y confiables, y cuando a menudo no se cuenta con la informaci&oacute;n hist&oacute;rica (e.g. per&iacute;odos prolongados, generalmente mayores de 50 a&ntilde;os) se puede recurrir al estudio de estructuras de perennaci&oacute;n (quistes, esporas, c&eacute;lulas de latencia) producidas por algunos grupos de organismos y usualmente provenientes de los sedimentos en lechos marinos (muestras geol&oacute;gicas).</font></p>     <p align="justify"><font face="verdana" size="2">Se pueden anotar algunos requisitos o condiciones para continuar el estudio de la biodiversidad del fitoplancton marino, como los siguientes: 1, capacitar, entrenar y contar con personal especializado en taxonom&iacute;a de especies de fitoplancton marino y en procedimientos de biolog&iacute;a molecular (Karlson et al., 2010); 2, establecer y desarrollar trabajo de investigaci&oacute;n colaborativo, tanto multidisciplinario como multiinstitucional; 3, utilizar nuevos conceptos, m&eacute;todos y protocolos en el estudio de las microalgas planct&oacute;nicas; y 4, producir bases de datos confiables y accesibles y el desarrollo de c&oacute;digo de barras para el reconocimiento de las especies. En cuanto al tema de fitoplancton t&oacute;xico y nocivo, hay mucho que decir, pero por ahora es conveniente remitir a los lectores a las revisiones recientes que dan cuenta de la situaci&oacute;n actual (Hern&aacute;ndez&#45;Becerril et al., 2007; Cort&eacute;s&#45;Altamirano y Sierra&#45;Beltr&aacute;n, 2008).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Se agradece el apoyo parcial por parte del Proyecto No. IN226209&#45;3, financiado por PAPIIT, DGAPA, UNAM, y a Yolanda Hornelas Orozco (ICMyL, UNAM), por su asistencia en el uso del MEB.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Literatura citada</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Adl, S. M., B. S. Leander, A. G. B. Simpson, J. M. Archibald, O. R. Anderson, D. Bass, S. S. Bowser, G. Brugerolle, M. A. Farmer, S. Karpov, M. Kolisko, C. E. Lane, D. J. Lodge, D. G. Mann, R. Meisterfeld, L. Mendoza, &Oslash;. Moestrup, S. E. Mozley&#45;Standridge, A. V. Smirnov y F. Spiegel. 2007. Diversity, nomenclature, and taxonomy of Protists. Systematic Biology 56:684&#45;689.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7623119&pid=S1870-3453201400020000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Ahlgren, N. A. y G. Rocap. 2006. Culture isolation and culture&#45;independent clone libraries reveal new marine <i>Synechococcus</i> ecotypes with distinct light and N physiologies. 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