<?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>S0188-49992024000100108</article-id>
<article-id pub-id-type="doi">10.20937/rica.54900</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Impacto del uso de suelo y la fragmentación del paisaje sobre la calidad del agua del río Teaone en Ecuador]]></article-title>
<article-title xml:lang="en"><![CDATA[Impact of land use and landscape fragmentation on water quality of the Teaone river in Ecuador]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferrer-Sánchez]]></surname>
<given-names><![CDATA[Yarelys]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Castillo]]></surname>
<given-names><![CDATA[Andy Jafet]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Plasencia-Vázquez]]></surname>
<given-names><![CDATA[Alexis Herminio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abasolo-Pacheco]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Técnica Estatal de Quevedo  ]]></institution>
<addr-line><![CDATA[Quevedo Los Ríos]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Campeche  ]]></institution>
<addr-line><![CDATA[Campeche Campeche]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>40</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992024000100108&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992024000100108&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992024000100108&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La calidad del agua en las cuencas hídricas depende de varios factores y en Ecuador muchos ríos se encuentran contaminados por impacto antrópico. Este estudio evaluó la influencia de diferentes usos de suelo y la fragmentación del paisaje sobre las características físicas y químicas del río Teaone, Ecuador. Se ubicaron ocho puntos de muestreo por uso de suelo (ganadería, sistemas agroforestales, bosques y zonas urbanas) donde se midieron temperatura, turbiedad, sólidos disueltos totales (SDT), pH, conductividad eléctrica, oxígeno disuelto (OD) y salinidad. Se registró el tipo de vegetación, ancho del caudal, sustrato y profundidad del agua. Se crearon parcelas circulares digitales para calcular indicadores de la estructura y fragmentación del paisaje (índice de bordes, dominancia e índice de fragmentación), e indicadores espectrales a través de índices de vegetación como el índice de vegetación de diferencia normalizada (NDVI, por su sigla en inglés), el índice de vegetación mejorado (EVI), y bandas del infrarrojo cercano (NIR), del rojo y azul. Varios parámetros físicos y químicos estuvieron dentro de los límites permisibles (turbidez = -38.7 UNT, pH = 8.1, conductividad eléctrica = 365 &#956;S/cm, temperatura = 26.0 ºC, salinidad = 0.15 UPS). Sin embargo, el OD y los SDT quedaron fuera de los límites en todos los usos de suelo (OD = 4.04, SDT = 186.1 mg/L). El pastizal tuvo mayor número de fragmentos (12.1), seguido de los poblados (9.4). Para el NIR, el EVI y el NDVI se observaron valores altos en bosque nativo, agroforestal y ganadería y el menor valor en la zona urbana. Los parámetros demuestran que los sistemas agroforestales y bosques nativos mantienen una buena calidad de agua, mientras que en la zona ganadera y urbana la calidad decrece.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Water quality in watersheds depends on several factors and in Ecuador many rivers are polluted by anthropogenic impact. This study evaluated the influence of different land uses and landscape fragmentation on the physical and chemical characteristics of the Teaone river, Ecuador. Eight sampling points were located by land use (livestock, agroforestry systems, forests, and urban areas) where temperature, turbidity, total dissolved solids (TDS), pH, electrical conductivity, dissolved oxygen (DO), salinity, vegetation type, flow width, substrate, and water depth were measured. Digital circular plots were created to calculate indicators of landscape structure and fragmentation (edge index, dominance, and fragmentation index), and spectral indicators through vegetation indices such as the normalized difference vegetation index (NDVI), enhanced vegetation index (EVI), and near infrared (NIR), red, and blue bands. Several physical and chemical parameters were within allowable limits (turbidity = -38.7 UNT, pH = 8.1, electrical conductivity = 365 &#956;S/cm, temperature = 26.0 ºC, salinity = 0.15 UPS). However, OD and SDT were outside the limits in all land uses (OD = 4.04, SDT = 186.1 mg/L). Grassland had the highest number of fragments (12.1), followed by settlements (9.4). For NIR, EVI and NDVI high values were observed in native forest, agroforestry, and livestock and lowest values in the urban area. The parameters show that agroforestry systems and native forests maintain good water quality, while in livestock and urban areas water quality decreases.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[actividades antrópicas]]></kwd>
<kwd lng="es"><![CDATA[análisis espacial]]></kwd>
<kwd lng="es"><![CDATA[contaminación del agua]]></kwd>
<kwd lng="es"><![CDATA[cuencas hidrográficas]]></kwd>
<kwd lng="es"><![CDATA[problemática ambiental]]></kwd>
<kwd lng="en"><![CDATA[anthropogenic activities]]></kwd>
<kwd lng="en"><![CDATA[environmental problems]]></kwd>
<kwd lng="en"><![CDATA[spatial analysis]]></kwd>
<kwd lng="en"><![CDATA[water contamination]]></kwd>
<kwd lng="en"><![CDATA[watersheds]]></kwd>
</kwd-group>
</article-meta>
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