<?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>S1870-34532015000300711</article-id>
<article-id pub-id-type="doi">10.1016/j.rmb.2015.05.008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estructura y composición del fitoplancton de Mina Pirquitas, Jujuy, Argentina]]></article-title>
<article-title xml:lang="en"><![CDATA[Structure and composition of phytoplankton from Mina Pirquitas, Jujuy, Argentina]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salusso]]></surname>
<given-names><![CDATA[María Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moraña]]></surname>
<given-names><![CDATA[Liliana Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Salta Facultad Ciencias Naturales ]]></institution>
<addr-line><![CDATA[Salta ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2015</year>
</pub-date>
<volume>86</volume>
<numero>3</numero>
<fpage>711</fpage>
<lpage>718</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532015000300711&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532015000300711&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532015000300711&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las actividades mineras originan condiciones ambientales extremas en los sistemas acuáticos porque tienden a producir altas concentraciones de metales pesados debido a que su solubilidad se incrementa marcadamente con la disminución del pH. En la región andina de la provincia de Jujuy a 4,200 m snm, el sistema exorreico del río Orosmayo (Ajedrez) está afectado por la explotación de plata en la mina Pirquitas. Se evaluó la estructura y composición del fitoplancton en 5 tributarios mediante muestreos en otoño y primavera del periodo 2011-2013, empleando técnicas estándares. La abundancia del fitoplancton fue más alta en la estación lluviosa, especialmente en marzo de 2011, en todos los sitios, con un máximo de 828 ind.ml&#8722;1 en el río Ajedrez. Los datos fisicoquímicos revelan condiciones ácidas en el río Pircas (pH entre 2.6 y 3.9) con altas concentraciones de Al3+ y Fe3+. Este sitio mostró menores valores de densidad de individuos (176 ind.ml&#8722;1), diversidad (2.67) y riqueza de especies (promedio 11) significativamente menores a los otros sitios de muestreo. Las diatomeas fueron afectadas por el pH en el río Pircas, siendo su representación baja (18.48%), con predominio de algas verdes (52%), principalmente fitoflagelados (Chlamydomonas, Dunaliella) y filamentos (Klebsormidium, Spirogyra, Zygogonium, Ulothrix) , entre otras.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Mining activities produce extreme environmental conditions in aquatic systems because they tend to contain unusually high concentrations of heavy metals as their solubility increases markedly while pH decreases. In the Andean region of Jujuy province at 4,200 m asl, the exorheic system of Orosmayo River (Ajedrez) is affected by the extraction of silver in Mina Pirquitas. The structure and composition of phytoplankton in 5 tributaries was evaluated by sampling in Autumn and Spring for the 2011-2013 period, using standard techniques. Phytoplankton abundance was higher in the rainy season, especially in March, 2011 in all sites, with a maximum of 828 ind.ml&#8722;1 in Ajedrez River. The physicochemical data revealed acidic conditions in the River Pircas (pH between 2.6 and 3.9) with high concentrations of Al3+, and Fe3+. This site showed lower density values (176 ind.ml&#8722;1), diversity (2.67) and species richness (average 11). Diatoms were affected by the pH in the River Pircas, because their percentage of representation was low (18.48%), with a predominance of green algae (52%), mainly represented by phytoflagellates (Chlamydomonas, Dunaliella) and filaments (Klebsormidium, Spirogyra, Zygogonium, Ulothrix) , among others.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Puna]]></kwd>
<kwd lng="en"><![CDATA[Algae]]></kwd>
<kwd lng="en"><![CDATA[South America]]></kwd>
<kwd lng="en"><![CDATA[Lotic system]]></kwd>
<kwd lng="en"><![CDATA[Orosmayo]]></kwd>
<kwd lng="es"><![CDATA[Puna]]></kwd>
<kwd lng="es"><![CDATA[Algas]]></kwd>
<kwd lng="es"><![CDATA[Sudamérica]]></kwd>
<kwd lng="es"><![CDATA[Sistema lótico]]></kwd>
<kwd lng="es"><![CDATA[Orosmayo]]></kwd>
</kwd-group>
</article-meta>
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