<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742016000300355</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Decoupled lake history and regional moisture availability in the middle elevations of tropical Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Historia desacoplada del lago y la disponibilidad regional de humedad en las elevaciones medias del México tropical]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Molina]]></surname>
<given-names><![CDATA[Yosahandy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa-Metrio]]></surname>
<given-names><![CDATA[Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zawisza]]></surname>
<given-names><![CDATA[Edyta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Franco-Gaviria]]></surname>
<given-names><![CDATA[Juan Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[Liseth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prado]]></surname>
<given-names><![CDATA[Blanca]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Charqueño-Célis]]></surname>
<given-names><![CDATA[Fernanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esperón-Rodríguez]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Polish Academy of Sciences  ]]></institution>
<addr-line><![CDATA[Warsaw ]]></addr-line>
<country>Poland</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Macquarie University Faculty of Sciences and Engineering Department of Biological Sciences]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Australia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<volume>33</volume>
<numero>3</numero>
<fpage>355</fpage>
<lpage>364</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742016000300355&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742016000300355&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742016000300355&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract During the Holocene, most of the climatic variability in the tropics has manifested through changes in the precipitation regime. Although there is relatively a large amount of information on this climatic variability from the lowlands during this time period, little is known regarding the environmental variability in the middle elevations. Here we present evidence of environmental change from a lacustrine sedimentary record recovered from Lake Lacandón, a small shallow water body located in the middle elevations of Chiapas, Mexico. Through analyses of cladoceran assemblages and chemical properties of the sediments (concentrations of C, Ca, N, Rb, Sr, Ti, and Zr), we aimed to reconstruct local and regional environmental conditions during the last 4,000 years. Our results show a highly dynamic cladoceran community apparently associated with changes in the size of the lake, which although variable has been enlarging through the last 4,000 years. Geochemical evidence also suggests high variability in moisture availability overimposed on a general trend towards drier conditions. Whereas the growing lake size seems associated with decreasing insolation seasonality, the trend to drier regional climates corresponds to the well-known southward displacement of the Intertropical Convergence Zone through the Holocene. Although the regional climate has been deteriorating, the enlarging lake suggests a decreasing water deficit though time. This pattern is probably a result of increasing insolation during the dry season, causing advection of marine moisture that precipitates because of the steep elevation gradient. Our results highlight the intricate nature of the millennial scale environmental variability, and the potential role of the middle elevations for sheltering biodiversity through times of environmental hardship.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Durante el Holoceno la mayor parte de la variabilidad climática en los trópicos se manifestó a través de cambios en los regímenes de precipitación. En este sentido, existe una cantidad de información relativamente extensa con respecto a la variabilidad climática en las tierras bajas, mientras poco se conoce en relación a la variabilidad ambiental de las elevaciones medias. En este trabajo presentamos evidencia de cambios ambientales derivada de una secuencia sedimentaria recuperada en el Lago Lacandón, un cuerpo de agua somero y pequeño ubicado en las elevaciones medias del Estado de Chiapas, México. Mediante el análisis de algunas propiedades químicas de los sedimentos (concentraciones de C, Ca, N, Rb, Sr, Ti, y Zr) y los ensambles de cladóceros contenidos por los mismos, abordamos la reconstrucción de las condiciones ambientales locales y regionales a través de los últimos 4,000 años. Los resultados mostraron una comunidad de cladóceros altamente dinámica en el tiempo que ha estado aparentemente asociada con el tamaño del lago. Los cladóceros muestran que, aunque variable, el tamaño del cuerpo de agua ha mostrado una tendencia creciente a través del tiempo. La evidencia geoquímica también muestra alta variabilidad en la disponibilidad de humedad regional superpuesta sobre una tendencia general hacia condiciones más secas. Mientras el crecimiento del tamaño del lago podría estar asociado a una reducción en la estacionalidad de la insolación, la tendencia hacia condiciones más secas parece asociada a la bien conocida migración hacia el sur de la Zona Intertropical de Convergencia a través del Holoceno. Aunque el clima regional se ha ido deteriorando, el crecimiento del lago sugiere una reducción en el déficit anual de humedad. Este patrón es probablemente el resultado del aumento en la insolación durante las estación seca, el cual causaría advección de aire húmedo desde el mar, el cual precipitaría dado el gradiente orográfico. Los resultados de este estudio demuestran la naturaleza compleja de la variabilidad ambiental a escala de milenios, y el papel potencial de las elevaciones medias como refugios de diversidad durante tiempos de climas desfavorables.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[tropical Mexico]]></kwd>
<kwd lng="en"><![CDATA[paleoecology]]></kwd>
<kwd lng="en"><![CDATA[paleoclimatology]]></kwd>
<kwd lng="en"><![CDATA[cladocerans]]></kwd>
<kwd lng="en"><![CDATA[geochemistry]]></kwd>
<kwd lng="es"><![CDATA[México tropical]]></kwd>
<kwd lng="es"><![CDATA[paleoecología]]></kwd>
<kwd lng="es"><![CDATA[paleoclimatología]]></kwd>
<kwd lng="es"><![CDATA[cladóceros]]></kwd>
<kwd lng="es"><![CDATA[geoquímica]]></kwd>
</kwd-group>
</article-meta>
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