<?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>2222-145X</journal-id>
<journal-title><![CDATA[Reportes científicos de la FACEN]]></journal-title>
<abbrev-journal-title><![CDATA[Rep. cient. FACEN]]></abbrev-journal-title>
<issn>2222-145X</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Exactas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2222-145X2024000200055</article-id>
<article-id pub-id-type="doi">10.18004/rcfacen.2024.15.2.055</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación de la concentración de cianobacterias en las playas de San Bernardino, Ypacaraí y Areguá del Lago Ypacaraí durante el periodo 2022-2024]]></article-title>
<article-title xml:lang="en"><![CDATA[Evaluation of Cyanobacteria concentration in the beaches of San Bernardino, Ypacaraí, and Areguá of Lake Ypacaraí during the period 2022-2024]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ávalos de Enciso]]></surname>
<given-names><![CDATA[Claudia Raquel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León Ávalos]]></surname>
<given-names><![CDATA[Franco Nahuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acosta Britez]]></surname>
<given-names><![CDATA[Rocío Rosmary]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arrua]]></surname>
<given-names><![CDATA[Andrea Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jara Villasboa]]></surname>
<given-names><![CDATA[Zunilda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brozón Benítez]]></surname>
<given-names><![CDATA[Gustavo René]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz Cubilla]]></surname>
<given-names><![CDATA[Felicia Mabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Benítez Rodas]]></surname>
<given-names><![CDATA[Gilberto Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Asunción Centro Multidisciplinario de Investigaciones Tecnológicas Laboratorio de Calidad de Aguas]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Asunción Centro Multidisciplinario de Investigaciones Tecnológicas Laboratorio de Hidrobiología]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Asunción Centro Multidisciplinario de Investigaciones Tecnológicas Mycology Investigation and Safety Team]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional de Asunción Centro Multidisciplinario de Investigaciones Tecnológicas Área de Gestión de Proyectos Ambientales]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>15</volume>
<numero>2</numero>
<fpage>55</fpage>
<lpage>66</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2222-145X2024000200055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2222-145X2024000200055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2222-145X2024000200055&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El Lago Ypacaraí, un ecosistema acuático de gran relevancia en Paraguay, ha sido objeto de investigación debido a las proliferaciones de cianobacterias en ciertos periodos del año y que representa riesgos significativos para la salud pública y la biodiversidad. En este trabajo se planteó como objetivo evaluar la concentración de cianobacterias en las Playas Municipales de San Bernardino, Ypacaraí y Areguá, abarcando las estaciones de verano de mayor afluencia durante un periodo de tres años (2022-2024). Se realizaron 15 campañas de monitoreo, se midieron parámetros in situ (pH, conductividad, oxígeno disuelto y temperatura) y se analizaron muestras de agua superficial en el CEMIT para determinar las concentraciones de cianobacterias, fósforo total y nitrógeno total. Se observaron variaciones importantes de las cianobacterias en las 3 playas y los géneros más frecuentes fueron Microcystis, Pseudanabena y Dolichospermum. Los resultados del análisis de Kruskal-Wallis indicaron diferencias significativas a lo largo del tiempo (p menor a 0,05) respecto a las concentraciones de cianobacterias (0 - 38.883 cél.mL-1). El coeficiente de correlación de Spearman reveló una correlación positiva significativa entre cianobacterias y conductividad (r=0,55), sugiriendo que una mayor presencia de iones disueltos y nutrientes pudo favorecer su proliferación, mientras que la correlación negativa con el nitrógeno total Kjeldahl (r=-0,52) resaltó el aumento de la biomasa debido a la capacidad de algunas cianobacterias para fijar nitrógeno atmosférico en condiciones de deficiencia de este. Los hallazgos reflejan la compleja interacción entre las cianobacterias y las condiciones fisicoquímicas del agua, subrayando la importancia de factores ambientales y antropogénicos en la dinámica de estos microorganismos en el Lago Ypacaraí.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Lake Ypacaraí, a significant aquatic ecosystem in Paraguay, has been the subject of research due to the proliferation of cyanobacteria during certain times of the year, which poses significant risks to public health and biodiversity. The aim of this study was to evaluate the concentration of cyanobacteria at the Municipal Beaches of San Bernardino, Ypacaraí, and Areguá during the summer seasons, which see higher visitor numbers, over a three-year period (2022-2024). Fifteen monitoring campaigns were conducted, where in situ parameters such as pH, conductivity, dissolved oxygen, and temperature were measured. Surface water samples were analyzed at CEMIT to determine cyanobacteria concentrations, total phosphorus, and total nitrogen. Significant variations in cyanobacteria were observed across the three beaches, with the most common genera being Microcystis, Pseudanabaena, and Dolichospermum. The results of the Kruskal-Wallis analysis indicated significant differences over time (p less than 0.05) in cyanobacteria concentrations (0 - 38,883 cells/mL). Spearman's correlation coefficient revealed a significant positive correlation between cyanobacteria and conductivity (r=0.55), suggesting that a higher presence of dissolved ions and nutrients may have favored their proliferation. Meanwhile, the negative correlation with total Kjeldahl nitrogen (r=-0.52) highlighted the increase in biomass due to the ability of some cyanobacteria to fix atmospheric nitrogen under conditions of nitrogen deficiency. These findings reflect the complex interaction between cyanobacteria and the physicochemical conditions of the water, emphasizing the importance of environmental and human factors in the dynamics of these microorganisms in Lake Ypacaraí.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[eutrofización]]></kwd>
<kwd lng="es"><![CDATA[calidad de agua]]></kwd>
<kwd lng="es"><![CDATA[nutrientes]]></kwd>
<kwd lng="es"><![CDATA[variables ambientales]]></kwd>
<kwd lng="en"><![CDATA[eutrophication]]></kwd>
<kwd lng="en"><![CDATA[water quality]]></kwd>
<kwd lng="en"><![CDATA[nutrients]]></kwd>
<kwd lng="en"><![CDATA[environmental variables]]></kwd>
</kwd-group>
</article-meta>
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<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Song]]></surname>
<given-names><![CDATA[J.]]></given-names>
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<name>
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<given-names><![CDATA[J.]]></given-names>
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<article-title xml:lang=""><![CDATA[Spatial response of water level and quality shows more significant heterogeneity during dry seasons in large river-connected lakes]]></article-title>
<source><![CDATA[Scientific Reports]]></source>
<year>2024</year>
<volume>14</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-14</page-range></nlm-citation>
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</back>
</article>
