<?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>2304-0106</journal-id>
<journal-title><![CDATA[Anales de la Academia de Ciencias de Cuba]]></journal-title>
<abbrev-journal-title><![CDATA[Anales de la ACC]]></abbrev-journal-title>
<issn>2304-0106</issn>
<publisher>
<publisher-name><![CDATA[Academia de Ciencias de Cuba]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2304-01062023000300012</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diversidad estructural y funcional de las comunidades bacterianas de dos ecosistemas dulceacuícolas del occidente de Cuba]]></article-title>
<article-title xml:lang="en"><![CDATA[Structure and functional diversity of bacterial communities of two freshwater ecosystems in western Cuba]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Larrea Murrell]]></surname>
<given-names><![CDATA[Jeny A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas Badía]]></surname>
<given-names><![CDATA[Marcia M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romeu Alvarez]]></surname>
<given-names><![CDATA[Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Heydrich Pérez]]></surname>
<given-names><![CDATA[Mayra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Soto]]></surname>
<given-names><![CDATA[Ivette]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Izquierdo Fiallo]]></surname>
<given-names><![CDATA[Katherin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lugo Moya]]></surname>
<given-names><![CDATA[Daysi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas Hernández]]></surname>
<given-names><![CDATA[Nidia M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de La Habana Facultad de Biología ]]></institution>
<addr-line><![CDATA[ La Habana]]></addr-line>
<country>Cuba</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>13</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2304-01062023000300012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2304-01062023000300012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2304-01062023000300012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción:  Las comunidades bacterianas pueden ser utilizadas como indicadoras del estado ecológico de los ecosistemas dulceacuícolas en la evaluación de la calidad de las aguas. El objetivo es determinar la relación entre la estructura y función de las comunidades bacterianas y la calidad química y microbiológica de los ríos Almendares y San Juan.  Métodos:  Se tomaron muestras de 3 estaciones de muestreo de ambos ríos en el periodo 2013-2017. Se determinó la estructura y composición de las comunidades bacterianas mediante electroforesis en gel con gradiente desnaturalizante y pirosecuenciación 454. Se determinó la actividad proteolítica extracelular y la actividad fosfatasa ácida en las aguas y se aislaron y caracterizaron bacterias a partir de las aguas y rizosedimentos de plantas acuáticas del río Almendares.  Resultados:  La estructura y composición de las comunidades bacterianas permitió establecer diferencias significativas entre ambos ríos. Se demostró que la contaminación fecal, las altas concentraciones de oxígeno disuelto y bajas concentraciones de nutrientes contribuyen a la variabilidad de la composición de las comunidades bacterianas de ambos ríos. La mayor actividad proteolítica se detectó en el río San Juan y la mayor actividad fosfatasa ácida en el río Almendares. Las bacterias pertenecientes al género bacillus sp. predominaron en el río Almendares y produjeron proteasas, amilasas, fosfatasas, esterasas, aminopeptidasas y glucanasas. Conclusiones: Se demostró la factibilidad del uso de las comunidades bacterianas como indicadores del estado ecológico de los ecosistemas dulceacuícolas para evaluar el impacto de la contaminación química y microbiológica sobre el medio ambiente y la salud humana.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction:  Bacterial communities can be used as indicators of the ecological status of freshwater ecosystems in the evaluation of water quality. The objective of this research was to determine the relationship between the structure and function of bacterial communities and the chemical and microbiological quality of the Almendares and San Juan rivers.  Methods:  They were taken samples from three sampling stations of both rivers in the period 2014-2017. It was determined the structure and composition of the bacterial communities by denaturing gradient gel electrophoresis (DGGE) and 454 pyrosequencing. It was determined the extracellular proteolytic activity and acid phosphatase activity in the waters of both ecosystems and they were isolated and characterized bacteria from the waters and rhizosediments of aquatic plants of the Almendares River.  Results:  The structure and composition of the bacterial communities allowed to establish significant differences between the two rivers. It was shown that faecal contamination is the factor that most contributes to the variability of the bacterial communities composition of the Almendares River. On the other hand, the high concentrations of dissolved oxygen and low concentrations of nutrients are the factors that most influence the bacterial communities of the San Juan River. The highest proteolytic activity was detected in the San Juan River compared to the Almendares River. Nevertheless, it was detected the highest acid phosphatase activity in Almendares River. Bacteria belonging to the genus Bacillus sp. predominated in the Amendares River and produced proteases, amylases, phosphatases, esterases, aminopeptidases and glucanases. Conclusions: It was demonstrated the feasibility of using bacterial communities as indicators of the ecological status of freshwater ecosystems to evaluate the impact of chemical and microbiological contamination on the environment and human health.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[calidad de agua]]></kwd>
<kwd lng="es"><![CDATA[ríos]]></kwd>
<kwd lng="es"><![CDATA[electroforesis en gel con gradiente desnaturalizante]]></kwd>
<kwd lng="es"><![CDATA[pirosecuenciación 454]]></kwd>
<kwd lng="es"><![CDATA[enzimas extracelulares]]></kwd>
<kwd lng="en"><![CDATA[water quality]]></kwd>
<kwd lng="en"><![CDATA[rivers]]></kwd>
<kwd lng="en"><![CDATA[denaturing gradient gel electrophoresis (DGGE)]]></kwd>
<kwd lng="en"><![CDATA[454 pyrosequencing]]></kwd>
<kwd lng="en"><![CDATA[extracellular enzymes]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Bacchetti]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Lugo]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Heydrich]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Estéve]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Boltes]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Influencia de la contaminación química y fecal sobre la estructura de las comunidades bacterianas del río Almendares]]></article-title>
<source><![CDATA[Revista Científica Interdisciplinaria Investigación y Saberes]]></source>
<year>2014</year>
<volume>3</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>1-11</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Romeu]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Quintero]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Heydrich]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Calidad química y microbiológica de las aguas del río San Juan, Artemisa (Cuba)]]></article-title>
<source><![CDATA[Higiene y Sanidad Ambiental]]></source>
<year>2015</year>
<volume>15</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>1367-74</page-range></nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Heydrich]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Romeu]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Lugo]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Mahillon]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[MM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Bacterial community structure of Almendares and San Juan rivers. Relationship with water quality]]></article-title>
<source><![CDATA[Revista Cubana de Ciencias Biológicas]]></source>
<year>2020</year>
<volume>8</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>1-14</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Izquierdo]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Lugo]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[MM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Proteolytic enzyme activity and its relationship with physicochemical and microbiological indicators in freshwater ecosystems of western Cuba]]></article-title>
<source><![CDATA[Water, Air and Soil Pollution]]></source>
<year>2020</year>
<volume>231</volume>
<page-range>1-15</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Romeu]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Lugo]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Acid phosphatase activity in freshwater ecosystems of western Cuba and its relationship with water quality]]></article-title>
<source><![CDATA[Water, Air and Soil Pollution]]></source>
<year>2022</year>
<volume>233</volume>
</nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[MM]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Romeu]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Bacchetti]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Gillis]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Boltes]]></surname>
<given-names><![CDATA[AK]]></given-names>
</name>
<name>
<surname><![CDATA[Heydrich]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Lugo]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Mahillon]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Diversity and enzymatic potentialities of Bacillus sp. strains isolated from a polluted freshwater ecosystem in Cuba]]></article-title>
<source><![CDATA[World Journal of Microbiology and Biotechnology]]></source>
<year>2018</year>
<volume>34</volume>
<page-range>1-11</page-range></nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[ter Braak]]></surname>
<given-names><![CDATA[CJF]]></given-names>
</name>
<name>
<surname><![CDATA[Smilauer]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<source><![CDATA[CANOCO Reference manual and CanoDraw for Windows User&amp;apos;s guide: Software for Canonical Community Ordination (version 4.5).]]></source>
<year>2002</year>
<page-range>500</page-range><publisher-loc><![CDATA[Ithaca NY, USA ]]></publisher-loc>
<publisher-name><![CDATA[Microcomputer Power]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="book">
<collab>StatSoft</collab>
<source><![CDATA[Statistica]]></source>
<year></year>
<publisher-name><![CDATA[sistema de software de análisis de datos]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Heydrich]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Garcia]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Romeu]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Lugo]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Bacchetti]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Estéve]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Boltes]]></surname>
<given-names><![CDATA[AK]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[MM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Impact of chemical and microbiological water quality on bacterial community assemblage of San Juan River (Sierra del Rosario, Biosphere Reserve, Cuba)]]></article-title>
<source><![CDATA[Tecnología y Ciencias del Agua]]></source>
<year>2021</year>
<volume>12</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>82-123</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[MM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Detección de la producción de enzimas extracelulares de interés ecológico a partir de aislados del río Almendares]]></article-title>
<source><![CDATA[Revista Estudiantil Nacional de Ingeniería y Arquitectura (Renia)]]></source>
<year>2013</year>
<volume>4</volume>
<numero>1-2</numero>
<issue>1-2</issue>
<page-range>37-41</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[MM]]></given-names>
</name>
<name>
<surname><![CDATA[Lugo]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Heydrich]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Structure of rapid growth culturable heterotrophic bacterial community in Almendares River, Havana, Cuba]]></article-title>
<source><![CDATA[Revista Cubana de Ciencias Biológicas]]></source>
<year>2020</year>
<volume>8</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-9</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
