<?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>0120-548X</journal-id>
<journal-title><![CDATA[Acta Biológica Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta biol.Colomb.]]></abbrev-journal-title>
<issn>0120-548X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-548X2021000300303</article-id>
<article-id pub-id-type="doi">10.15446/abc.v26n3.85300</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[EFECTOS ADVERSOS MORFOLÓGICOS EN EXPOSICIÓN HIPERAGUDA A LODOS DE PERFORACIÓN EN BASE AGUA EN Hydractinia symbiolongicarpus (Familia: Hydractiniidae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Morphologic adverse effects in hyperacute exposition to water-based mud in Hydractinia symbiolongicarpus (Hydractiniidae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras-A]]></surname>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Departamento de Biología]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto para las Neurociencias  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>26</volume>
<numero>3</numero>
<fpage>303</fpage>
<lpage>311</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-548X2021000300303&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-548X2021000300303&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-548X2021000300303&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los desechos derivados del proceso de perforación en las plataformas marinas petroleras pueden dejar hasta 200 000 toneladas de residuos de perforación en los ecosistemas marinos. El principal agente contaminante son los lodos de perforación petrolera (LPPs), que son usados para enfriar y lubricar la broca de perforación, además de contrarrestar fuerzas de presión y posibles fugas de hidrocarburos. Se sabe que los LPPs tienen un efecto contaminante y tóxico observándose alteraciones en los ecosistemas y efectos adversos en organismos invertebrados marinos, debidos principalmente a la presencia de barita y trazas de metales pesados. En este trabajo se realizaron experimentos de exposición hiperagudos con mezclas completas de lodos de perforación base agua (WBM) a máximos niveles de concentración en colonias de Hydractinia symbiolongicarpus. Los resultados mostraron cambios significativos (p &lt; 0,001) en la morfología de los pólipos inmediatamente después del contacto con WBM, con un incremento 1,5 veces en el diámetro del pólipo y una retracción en la longitud de los tentáculos del 75 %. Después de la exposición (fase de recuperación), se observó una disminución de biomasa a las 72 h con pérdida del 50 % de los pólipos y una reducción de la mata estolonal cercana al 50 % (p &lt; 0,01). Efectos similares han sido reportados en otras especies de cnidarios, como los corales, donde se observó retracción de pólipos y zonas expuestas de exoesqueleto. La exposición a WBM genera irritación tisular en exposición directa y en casos severos pérdida de biomasa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Wastes derived from the drilling process on offshore oil platforms can leave up to 200 000 tons of cuttings in marine ecosystems. The principal pollutants in cuttings are drilling muds (DM). The DM are used to cool and lubricate the drill bit, counteract pressure forces and possible hydrocarbon leaks. DM contaminate the marine environment and have toxic adverse effects upon marine invertebrate organisms, mainly due to the presence of barite and traces of heavy metals. In this research, hyperacute exposure experiments were performed with complete mixtures of water-based drilling muds (WBM) at maximum concentration levels in Hydractinia symbiolongicarpus colonies. Results showed significant changes (p &lt; 0.001) in polyp morphology immediately after contact with WBM, with a 1.5-fold increase in its diameter and a 75 % of retraction in the length of the tentacles. A biomass loss was observed after exposure (recovery phase). Near 50 % of polyps and stolonal mat were bioabsorbed with statistical significance (p &lt; 0.01) at 72 h. Similar effects have been reported in other species of cnidarians, such as corals, where there is retraction of polyps and exoskeleton exposed areas also observed. Exposure to WBM generates tissue irritation and extreme cases loss of biomass.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Contaminación ambiental]]></kwd>
<kwd lng="es"><![CDATA[Hydrozoa]]></kwd>
<kwd lng="es"><![CDATA[lodos de perforación petrolera]]></kwd>
<kwd lng="es"><![CDATA[plataformas de perforación petrolera]]></kwd>
<kwd lng="es"><![CDATA[toxicidad]]></kwd>
<kwd lng="en"><![CDATA[Drilling muds]]></kwd>
<kwd lng="en"><![CDATA[Hydrozoa]]></kwd>
<kwd lng="en"><![CDATA[offshore platforms]]></kwd>
<kwd lng="en"><![CDATA[polluting environmental]]></kwd>
<kwd lng="en"><![CDATA[toxicity]]></kwd>
</kwd-group>
</article-meta>
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<given-names><![CDATA[EA]]></given-names>
</name>
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<source><![CDATA[Elsevier Oceanogr Ser]]></source>
<year>1980</year>
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<person-group person-group-type="author">
<name>
<surname><![CDATA[Ulmer]]></surname>
<given-names><![CDATA[DC]]></given-names>
</name>
<name>
<surname><![CDATA[Leisola]]></surname>
<given-names><![CDATA[MSA]]></given-names>
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<name>
<surname><![CDATA[Schmidt]]></surname>
<given-names><![CDATA[BH]]></given-names>
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<name>
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<article-title xml:lang=""><![CDATA[Rapid Degradation of Isolated Lignins by Phanerochaete chrysosporium]]></article-title>
<source><![CDATA[Appl Environ Microbiol]]></source>
<year>1983</year>
<volume>45</volume>
<numero>6</numero>
<issue>6</issue>
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</article>
