<?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>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082018000400353</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.777</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variación espacial y temporal de nutrientes y total de sólidos en suspensión en la cuenca de un río de alta montaña tropical]]></article-title>
<article-title xml:lang="en"><![CDATA[Temporary and spatial variation of nutrients and total suspended solids in the basin of a high mountain tropical river]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Benjumea-Hoyos]]></surname>
<given-names><![CDATA[Carlos A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez-Segura]]></surname>
<given-names><![CDATA[Mayra A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villabona-González]]></surname>
<given-names><![CDATA[Silvia Lucía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Católica de Oriente Grupo de investigación Limnología y Recursos Hídricos ]]></institution>
<addr-line><![CDATA[Rionegro ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>42</volume>
<numero>165</numero>
<fpage>353</fpage>
<lpage>363</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082018000400353&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082018000400353&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082018000400353&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los sistemas de aguas dulces son sensibles a modificaciones antrópicas. Las actividades diarias allí en donde el agua es un recurso imprescindible para la industria y el ámbito doméstico aceleran el proceso natural de eutrofización en los ecosistemas acuáticos con el consecuente deterioro de su calidad. Con la finalidad de entender los cambios en el tiempo y el espacio de las concentraciones de nutrientes (nitrógeno y fósforo) y del total de sólidos en suspensión (TSS) en el río Negro, se recolectó la información en los tramos alto, medio y bajo de la cuenca en las épocas de sequía, durante la transición de la época de lluvias a la sequía y en la época de lluvias desde el 2010 hasta el 2014. Se encontró que las quebradas La Pereira, La Cimarrona y La Marinilla, afluentes del río Negro, son focos de interés ambiental, dado que presentaron mayores concentraciones de nutrientes y de sólidos en suspensión que afectan de manera notoria las aguas del río, en especial en el tramo conocido como Puente Autopista-RN5, donde estas convergen. Además, se evidenció que los fenómenos de variabilidad climática, como el sistema de El Niño- Oscilación del Sur (ENOS) en su fase invernal (La Niña), incrementan notablemente las concentraciones de sólidos en suspensión y que los periodos de sequía favorecen el aumento en las concentraciones de nutrientes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Freshwater ecosystems are highly sensitive to anthropic disturbances and daily activities in which water is an essential resource for industrial development and for domestic use have led to speed up early natural eutrophication of aquatic ecosystems resulting in water quality deterioration. In order to understand temporal and spatial changes of nutrients concentrations (nitrogen and phosphorus) and of the total suspended solids in the Río Negro, we collected information from high, medium and low basin stretches during the dry and rainy seasons, as well as during the transition from dry to rainy periods between 2010 and 2014. Our results show that Rio Negro tributary ravines La Pereira, La Cimarrona and La Marinilla are of high environmental priority as they presented the highest concentrations of nutrients and suspended solids and this is negatively affecting the Rio Negro water quality, especially in the stretch known as Puente-Autopista RN5 where these tributaries converge. In addition, we found that climatic variability phenomena such as the ENSO system, in this case, the rainy season (La Niña) seriously impact the river increasing suspended solids concentrations while the dry season favors an increase in nutrient concentrations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fósforo]]></kwd>
<kwd lng="es"><![CDATA[Nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[Eutrofización]]></kwd>
<kwd lng="es"><![CDATA[Material suspendido]]></kwd>
<kwd lng="es"><![CDATA[Cuenca]]></kwd>
<kwd lng="en"><![CDATA[Phosphorus]]></kwd>
<kwd lng="en"><![CDATA[Nitrogen]]></kwd>
<kwd lng="en"><![CDATA[Eutrophication]]></kwd>
<kwd lng="en"><![CDATA[Suspended material]]></kwd>
<kwd lng="en"><![CDATA[Basin]]></kwd>
</kwd-group>
</article-meta>
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<article-title xml:lang=""><![CDATA[Temporal and spatial variation of nitrogen and phosphorus and eutrophication assessment for a typical arid river- Fuyang River in northern China]]></article-title>
<source><![CDATA[Journal of Environmental Sciences]]></source>
<year>2017</year>
<volume>55</volume>
<page-range>41-8</page-range></nlm-citation>
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</back>
</article>
