<?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>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992017000300361</article-id>
<article-id pub-id-type="doi">10.20937/rica.2017.33.03.01</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[EFFECTS OF PRODUCTIVE ACTIVITIES ON THE WATER QUALITY FOR HUMAN CONSUMPTION IN AN ANDEAN BASIN, A CASE STUDY]]></article-title>
<article-title xml:lang="es"><![CDATA[EFECTO DE LAS ACTIVIDADES PRODUCTIVAS SOBRE LA CALIDAD DEL AGUA PARA CONSUMO HUMANO EN UNA CUENCA ANDINA]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz]]></surname>
<given-names><![CDATA[Diana Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Idrobo]]></surname>
<given-names><![CDATA[Juan Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Otero Sarmiento]]></surname>
<given-names><![CDATA[Juan Diego]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Figueroa Casas]]></surname>
<given-names><![CDATA[Apolinar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad del Cauca Grupo de Estudios Ambientales ]]></institution>
<addr-line><![CDATA[Popayán Cauca]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>33</volume>
<numero>3</numero>
<fpage>361</fpage>
<lpage>375</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992017000300361&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992017000300361&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992017000300361&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Productive activities such as agriculture and livestock have transformed the Andean basins in South America. In accordance with this statement, the objective of this study was to assess the water quality of &#8220;Las Piedras&#8221; river located in an Andean basin with 6626 ha in Colombian Highlands. This study analyzed nutrient inputs from agricultural production, spatial crops distribution, human activities and their influence on the ecological state of the river. The evaluation integrated physicochemical and biological parameters in the indexes of water quality, pollution and the aquatic macroinvertebrates community. Results showed that aggregated crop fields occupy 25.2 % in the basin and the biological water quality through the Biological Monitoring Working Party (BMWP) index denotes the presence of tolerant-pollution organisms, additionally the biodiversity was low (Shannon H´1.1). The water quality in the river satisfies the Colombian regulation criteria for human consumption, even higher concentrations of nutrients in the lower area with 2.20 mg/L nitrates and 1.49 mg/L of phosphates, besides the loss of nutrients by runoff, which was 2.57 mg/L nitrates in the middle area and 0.18 mg/L phosphates in the upper area. In this sense, the nutrient concentration input increases toward the lower area of the basin because of the crop distribution. The agricultural land use modified the hydrological ecosystem services by decreasing the basin water regulatory capacity and nutrients input to the main stream.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las actividades productivas como la agricultura y la ganadería han transformado las cuencas andinas de América del Sur. El objetivo de este estudio fue evaluar la calidad del agua en la cuenca del río Las Piedras (6626 ha), localizada en la alta montaña colombiana. Se analizaron los aportes de nutrientes a partir de la producción agrícola, distribución espacial de cultivos, actividades humanas y su influencia en el estado ecológico del río. La evaluación integró los parámetros físicos, químicos y biológicos en índices de calidad del agua, de contaminación y de macroinvertebrados acuáticos. Los resultados mostraron que los cultivos ocupan el 25.2 % de la cuenca, la calidad biológica del agua según el índice del Grupo de Trabajo de Monitoreo Biológico (BMWP, por sus siglas en inglés) evidenció la presencia de organismos tolerantes a la contaminación y baja biodiversidad (Shannon H&#8217; 1.1). La calidad del agua es apta para consumo humano según los estándares establecidos por la normatividad Colombiana. Sin embargo, se encontraron altas concentraciones de nutrientes en la zona baja del río con 2.20 mg/L de nitratos y 1.49 mg/L de fosfatos, adicionalmente los aportes de nutrientes en escorrentía superficial fueron de 2.57 mg/L de nitratos en la zona media y 0.18 mg/L de fosfatos en la zona alta. En este sentido, se observó que el ingreso de nutrientes aumenta hacia la zona baja de la cuenca debido a la distribución espacial de los cultivos. El uso agrícola del suelo modificó los servicios ecosistémicos hídricos por la disminución de la capacidad de regulación en la cuenca y el aporte de nutrientes al cauce principal.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[water pollution]]></kwd>
<kwd lng="en"><![CDATA[agriculture]]></kwd>
<kwd lng="en"><![CDATA[spatial crop distribution]]></kwd>
<kwd lng="en"><![CDATA[biodiversity]]></kwd>
<kwd lng="en"><![CDATA[drinking water]]></kwd>
<kwd lng="es"><![CDATA[contaminación hídrica]]></kwd>
<kwd lng="es"><![CDATA[agricultura]]></kwd>
<kwd lng="es"><![CDATA[distribución espacial de los cultivos]]></kwd>
<kwd lng="es"><![CDATA[biodiversidad]]></kwd>
<kwd lng="es"><![CDATA[agua potable]]></kwd>
</kwd-group>
</article-meta>
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