<?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>1659-4266</journal-id>
<journal-title><![CDATA[Cuadernos de Investigación UNED]]></journal-title>
<abbrev-journal-title><![CDATA[Cuadernos de Investigación UNED]]></abbrev-journal-title>
<issn>1659-4266</issn>
<publisher>
<publisher-name><![CDATA[Universidad Estatal a Distancia de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-42662023000200166</article-id>
<article-id pub-id-type="doi">10.22458/urj.v15i2.4835</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Initial Limnology of Laguna Pozo Verde, Costa Rica: Bathymetry, Water, Sediments, and Diatoms]]></article-title>
<article-title xml:lang="es"><![CDATA[Limnología inicial de Laguna Pozo Verde, Costa Rica: Batimetría, agua, sedimentos y diatomeas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Horn]]></surname>
<given-names><![CDATA[Sally P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Johanson]]></surname>
<given-names><![CDATA[Erik N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murillo Herrera]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Haberyan]]></surname>
<given-names><![CDATA[Kurt A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Friedel]]></surname>
<given-names><![CDATA[Taber]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lane]]></surname>
<given-names><![CDATA[Chad S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Tennessee Department of Geography &amp; Sustainability ]]></institution>
<addr-line><![CDATA[Knoxville Tennessee]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Florida Atlantic University Department of Geosciences ]]></institution>
<addr-line><![CDATA[Boca Raton Florida]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Costa Rica Centro de Investigaciones Antropológicas ]]></institution>
<addr-line><![CDATA[San Pedro de Montes de Oca ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Northwest Missouri State University Department of Natural Sciences ]]></institution>
<addr-line><![CDATA[Maryville Missouri]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Florida Atlantic University Department of Geosciences ]]></institution>
<addr-line><![CDATA[Boca Raton Florida]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,University of North Carolina Wilmington Department of Earth and Ocean Sciences ]]></institution>
<addr-line><![CDATA[Wilmington North Carolina]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>15</volume>
<numero>2</numero>
<fpage>166</fpage>
<lpage>173</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-42662023000200166&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-42662023000200166&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-42662023000200166&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction: Costa Rica has hundreds of lakes, many of which have never been scientifically studied. Objective: To carry out a first, basic limnological study of Laguna Pozo Verde in Juan Castro Blanco National Park, Costa Rica (~1935m elevation), to provide baseline data for studying future changes. Methods: We measured water depths and temperatures, and Secchi depth; analyzed surface sediments; and examined maps and satellite imagery. Results: Though described by some as formed by volcanic processes, Laguna Pozo Verde likely formed in a landslide, which occur frequently in this rainy area on the steep south slope of the inactive Porvenir Volcano. Our soundings showed a maximum depth of 9,25m near the center of the lake. The water was moderately transparent (Secchi depth 2,6m), with circumneutral pH, and temperatures from 15,9-18,1°C, with weak stratification at 0,5m. Surface sediments contained 27% organic matter, and had C/N ratios and stable carbon isotope values consistent with lacustrine algae and C3 plants; Surirella angusta composed over 90% of the diatoms. Conclusion: The lake is significantly shallower than reported, and surface sediments have a diatom assemblage unique among 88 lakes examined in Costs Rica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción: Costa Rica tiene cientos de lagos, muchos nunca estudiados científicamente. Objetivo: Conocer la limnología de Laguna Pozo Verde en el Parque Nacional Juan Castro Blanco, Costa Rica (~1935m de elevación), como referencia para estudiar futuros cambios. Métodos: Medimos la profundidad y temperatura del agua y la profundidad de Secchi; analizamos sedimentos superficiales; y examinamos mapas e imágenes satelitales. Resultados: Aunque algunos la describen como formado por procesos volcánicos, es probable que Laguna Pozo Verde se haya formado en un deslizamiento de tierra, algo común en esta zona lluviosa de la empinada ladera sur del Volcán Porvenir (inactivo). Hallamos una profundidad máxima de 9,25m cerca del centro. El agua era moderadamente transparente (profundidad de Secchi 2,6m), con un pH cercano a neutral y temperaturas de 15,9-18,1°C, y una débil estratificación a 0,5m. Los sedimentos superficiales contenían un 27% de materia orgánica y tenían cocientes C/N y valores de isótopos de carbono estables, coherentes con algas lacustres y plantas C3; más del 90% de las diatomeas eran Surirella angusta. Conclusión: La laguna es significativamente más somera de lo informado y los sedimentos superficiales albergan una combinación de diatomeas única entre los 88 lagos examinados en Costa Rica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Lake formation]]></kwd>
<kwd lng="en"><![CDATA[bathymetry]]></kwd>
<kwd lng="en"><![CDATA[water temperatures]]></kwd>
<kwd lng="en"><![CDATA[lacustrine sediments]]></kwd>
<kwd lng="en"><![CDATA[diatoms.]]></kwd>
<kwd lng="es"><![CDATA[Formación de lagos]]></kwd>
<kwd lng="es"><![CDATA[batimetría]]></kwd>
<kwd lng="es"><![CDATA[temperatura del agua]]></kwd>
<kwd lng="es"><![CDATA[sedimentos lacustres]]></kwd>
<kwd lng="es"><![CDATA[diatomeas.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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