<?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>0187-7151</journal-id>
<journal-title><![CDATA[Acta botánica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Act. Bot. Mex]]></abbrev-journal-title>
<issn>0187-7151</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C., Centro Regional del Bajío]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-71512020000100128</article-id>
<article-id pub-id-type="doi">10.21829/abm127.2020.1639</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Aspectos ecológicos, taxonómicos y de distribución de cianobacterias bentónicas en cinco ríos de la región central de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Ecological, taxonomic and distributional aspects of benthic cyanobacteria in five streams of central Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cartajena Alcántara]]></surname>
<given-names><![CDATA[Mariana Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carmona Jiménez]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Perona Úrizar]]></surname>
<given-names><![CDATA[Elvira]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado en Ciencias del Mar y Limnología ]]></institution>
<addr-line><![CDATA[Cd. Mx. ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Laboratorio de Ecosistemas]]></institution>
<addr-line><![CDATA[Cd. Mx. ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Madrid Facultad de Ciencias Departamento de Biología]]></institution>
<addr-line><![CDATA[Cantoblanco ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<numero>127</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512020000100128&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512020000100128&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512020000100128&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos: Las cianobacterias son algas procariontes oxifotótrofas presentes en gran variedad de hábitats y son componentes importantes de las comunidades bentónicas en muchos ambientes continentales y marinos. En México su diversidad en ríos es poco conocida; por ello, este estudio contribuye al conocimiento ficoflorístico en cinco ríos de la región central de México. Se incluyen descripciones e ilustraciones, estimaciones de su diversidad, un análisis de las relaciones entre formas de crecimiento y factores microambientales, y se discute la validez de su caracterización morfológica y ecológica en la delimitación de las especies encontradas.  Métodos:  Se realizaron muestreos en secas y lluvias en dos ríos silíceos y tres ríos calcáreos del centro de México. Se registró la temperatura del agua, conductividad específica y pH, se analizaron iones mayores (Ca2+, Mg2+, K+, Na+, Si-SiO2, HCO3 -, Cl-, SO4 3-) y nutrientes (NH4 +, NO2 -, NO3 2-, PO4 3-), se estimó la diversidad de las cianobacterias registradas con el índice de Shannon-Weaver y se describieron sus hábitats y microhábitats. La identificación taxonómica se realizó utilizando literatura especializada.  Resultados clave: Se identificaron cuatro asociaciones y nueve especies pertenecientes a tres órdenes, siete familias y siete géneros. Se distinguieron dos grupos: el formado por Nostoc parmelioides-Coleodesmium wrangelii y Phormidium lividum-Leptolyngbya truncata en ríos silíceos de montaña y el compuesto por Schizothrix mexicana-Phormidium subfuscum, Homoeothrix juliana-Heteroleibleinia fontana y Nostoc verrucosum en ríos calcáreos cálidos. Se reconocieron dos patrones de distribución ecológica: 1) las especies del orden Nostocales presentes en condiciones estresantes de luz y velocidad de corriente y 2) los taxa de los órdenes Oscillatoriales y Synechococcales registrados en sitios con valores promedio de luz y flujo de agua.  Conclusiones: La caracterización morfológica y ecológica de especies de cianobacterias contribuye a su conocimiento ficoflorístico y es la base para futuras investigaciones sobre taxonomía, sistemática y uso sustentable de recursos algales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims:  Cyanobacteria are oxyphototrophic prokariotic algae present in great variety of habitats and they are important components of the benthic communities in many continental and marine environments. In Mexico, their diversity in streams is less known; therefore, this study contributes to phycofloristic knowledge in five streams of the central region of Mexico. Descriptions and illustrations, estimations of their diversity, an analysis of the relationships between growth forms and microenvironmental factors are included, and the validity of their morphological and ecological characterization in the delimitation of the species found is discussed.  Methods:  Sampling was carried out in dry and rainy seasons in two siliceous streams and three calcareous streams of central Mexico. Water temperature, specific conductivity and pH were recorded, major ions (Ca2+, Mg2+, K+, Na+, Si-SiO2, HCO3 -, Cl-, SO4 3-) and nutrients (NH4 +, NO2 -, NO3 2-, PO4 3-) were analyzed, the diversity was estimated of the cyanobacteria registered with the Shannon-Weaver index, and their habitats and microhabitats were described. Taxonomic identification was carried out with specialized literature.  Key results:  Four associations and nine species belonging to three orders, seven families and seven genera were identified. Two groups were distinguished: one formed by Nostoc parmelioides-Coleodesmium wrangelii, Phormidium lividum-Leptolyngbya truncata in siliceous and mountain streams, and one composed by Schizothrix mexicana-Phormidium subfuscum, Homoeothrix juliana-Heteroleibleinia fontana and Nostoc verrucosum in calcareous, warm streams. Two ecological distribution patterns were recognized: 1) the Nostocales species present in stressful conditions of light and current velocity and 2) the taxa of Oscillatoriales and Synechoccales registered in sites with mean values of light and water flow.  Conclusions:  Morphological and ecological characterization of cyanobacterial species contributes to their phycofloristic knowledge and the base for future research on taxonomy, systematics and sustainable use of algal resources.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[asociaciones]]></kwd>
<kwd lng="es"><![CDATA[diversidad]]></kwd>
<kwd lng="es"><![CDATA[ríos calcáreos]]></kwd>
<kwd lng="es"><![CDATA[ríos silíceos]]></kwd>
<kwd lng="en"><![CDATA[associations]]></kwd>
<kwd lng="en"><![CDATA[calcareous streams]]></kwd>
<kwd lng="en"><![CDATA[diversity]]></kwd>
<kwd lng="en"><![CDATA[siliceous streams]]></kwd>
</kwd-group>
</article-meta>
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