<?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>0188-8897</journal-id>
<journal-title><![CDATA[Hidrobiológica]]></journal-title>
<abbrev-journal-title><![CDATA[Hidrobiológica]]></abbrev-journal-title>
<issn>0188-8897</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-88972016000200251</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Cálculo del contenido celular de carbono de cuatro taxones de diatomeas: biovolumen y espectrofotometría]]></article-title>
<article-title xml:lang="en"><![CDATA[Calculation of the cell carbon content of four taxa of diatom: biovolume and spectrophotometry]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Gómez]]></surname>
<given-names><![CDATA[Carlos Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aké-Castillo]]></surname>
<given-names><![CDATA[José Antolín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Veracruzana Instituto de Ciencias Marinas y Pesquerías Laboratorio de Ecología Experimental]]></institution>
<addr-line><![CDATA[Boca del Río Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<volume>26</volume>
<numero>2</numero>
<fpage>251</fpage>
<lpage>257</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972016000200251&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972016000200251&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972016000200251&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes: La biomasa fitoplanctónica es un parámetro esencial en ecosistemas acuáticos; dos de los indicadores indirectos más utilizados para su estimación son la clorofila-a (Cl-a) mediante espectrofotometría y el biovolumen (BV).  Objetivos: Mostrar que tan distantes son las aproximaciones para calcular la biomasa fitoplanctónica utilizando los métodos de BV y espectrofotometría.  Métodos: Se utilizaron cuatro taxones de diatomeas marinas en cultivo a los cuáles se les estimó la biomasa mediante Cl-a y BV, en el caso del BV se realizaron las estimaciones en células vivas y fijadas con Lugol ácido.  Resultados: Los valores de biomasa obtenidos para Thalassiosira hispida y Skeletonema costatum son marcadamente diferentes, ya que el BV de células vivas subestima &#8776;41% su biomasa con respecto al cálculo por espectrofotometría en ambas especies. En Pseudo-nitzschia sp. y Cylindrotheca closterium el BV sobreestima el 4% y 25% respectivamente la biomasa. El Lugol ácido modificó el tamaño de las células de manera significativa en C. closterium y Pseudo-nitzschia sp. (p&lt;0.05), no siendo así con S. costatum y T. hispida (p&gt;0.05). Se presentan dos ecuaciones para cuantificar la biomasa a partir de mediciones morfométricas de las células vivas (pgC/cel = -1.5567+ 0.1428 (BV)) y fijadas con Lugol ácido (pgC/cel = -5.0126 + 0.1644 (BV)).  Conclusiones: Aunque el BV es útil, puede presentar inconvenientes ya que produce valores por arriba y por debajo de los estimados mediante espectrofotometría, además de que el Lugol ácido modifica el tamaño celular. Se recomienda considerar la información disponible basada en la Cl-a o carbono de diferentes especies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background: Phytoplankton biomass is an essential parameter in aquatic ecosystems; two of the most widely used indicators for estimating phytoplankton biomass are chlorophyll-a (Chl-a) by spectrophotometry and biovolume (BV).  Goals:  To show how different results are when estimating phytoplankton biomass by means of the spectrophotometric and BV methods.  Methods:  Biomass by Chl-a and BV were estimated in four cultures of marine diatoms. For estimating BV, we used live cells and acid Lugol&#8217;s solution fixed cells.  Results:  Biomass values were noticeably different: the BV for Thalassiosira hispida and Skeletonema costatum underestimates &#8776;41% of the biomass with respect to values obtained by spectrophotometry. In contrast, the BV for Pseudo-nitzschia sp. and Cylindrotheca closterium overestimates the biomass by 4% and 25%, respectively. In the case of estimated biovolume, the results indicate that fixer acid Lugol&#8217;s solution modified the size of the cell significantly in C. closterium and Pseudo-nitzschia sp. (p&lt;0.05), but not for S. costatum and T. hispida (p&gt;0.05). Two equations are provided for biomass calculation when studying live (pgC/cell = -1.5567 + 0.1428 (BV)) or acid Lugol&#8217;s solution fixed (pgC/cell = -5.0126 + 0.1644 (BV)) diatom cells.  Conclusions:  Although BV is useful, it can have drawbacks because it produces values above and below those estimated by spectrophotometry, in addition to the fact that acid Lugol´s solution modifies cell size. We would advise considering the available information based in Chl-a or carbon of different species.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Biomasa]]></kwd>
<kwd lng="es"><![CDATA[carbono]]></kwd>
<kwd lng="es"><![CDATA[clorofila a]]></kwd>
<kwd lng="es"><![CDATA[diatomea]]></kwd>
<kwd lng="es"><![CDATA[volumen celular]]></kwd>
<kwd lng="en"><![CDATA[Biomass]]></kwd>
<kwd lng="en"><![CDATA[carbon]]></kwd>
<kwd lng="en"><![CDATA[cell volume]]></kwd>
<kwd lng="en"><![CDATA[chlorophyll a]]></kwd>
<kwd lng="en"><![CDATA[diatom]]></kwd>
</kwd-group>
</article-meta>
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