<?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>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222018000100173</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2018v70n1a10</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Multiproxy response to climate- and human-driven changes in a remote lake of southern Patagonia (Laguna Las Vizcachas, Argentina) during the last 1.6 kyr]]></article-title>
<article-title xml:lang="es"><![CDATA[Respuesta multimetodológica a cambios climatológicos y antrópicos en un lago remoto de la Patagonia meridional (laguna Las Vizcachas, Argentina) durante los últimos 1.6 ka]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintana]]></surname>
<given-names><![CDATA[Flavia A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maidana]]></surname>
<given-names><![CDATA[Nora I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Motta]]></surname>
<given-names><![CDATA[Luciana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Massaferro]]></surname>
<given-names><![CDATA[Julieta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,CENAC  ]]></institution>
<addr-line><![CDATA[Bariloche ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UBA  ]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>70</volume>
<numero>1</numero>
<fpage>173</fpage>
<lpage>186</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222018000100173&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222018000100173&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222018000100173&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Laguna Las Vizcachas is a remote lake located in the southern Patagonian steppe east of the Andes, in a key area to study the effects of the climate, especially the mode and intensity of the mid-latitude westerlies which are the dominant climate drivers in this region. Pollen, diatom and chironomid records combined with sedimentological and geochemical data are used to reconstruct the environmental history of Laguna Las Vizcachas (50°42´ S; 71°59´ W; 1100 masl) from AD 400 to the present. Our results provide evidence of changing climate conditions during the last 1.6 kyr. From AD 400 to 1550, the presence of Poaceae pollen together with planktonic and small benthic diatoms suggests a gradual increase in precipitation, and persistent cold air temperatures. At ca. AD 1550, the decrease in Poaceae and the high values of small benthic diatoms are interpreted as colder temperatures, which agree with nearby records of glacial advances probably associated with the Little Ice Age. The simultaneous appearance of the cold-tolerant chironomid morpho taxa Tanytarsini supports this assumption. From AD 1750 to the present, the appearance of Ranunculaceae-type pollen, semi-terrestrial and littoral chironomids and epiphytic diatoms suggest the expansion of littoral habitats indicative of lower lake levels; which implies less precipitation than previously. Additionally, the increase of both planktonic diatoms Dicostella and Aulacoseira and the sharp decrease of small benthic diatoms is interpreted as the onset of a warming period. The appearance of Rumex and Plantago pollen is related to the arrival of Europeans and subsequent increasing human activity in the area.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Laguna Las Vizcachas es un lago remoto situado en la estepa de la Patagonia meridional al este de los Andes, en una zona clave para estudiar efectos del clima, especialmente por el modo y la intensidad de los vientos del oeste (westerlies), que constituyen el factor climático dominante en la región. En este trabajo se utilizaron registros sedimentarios de polen, diatomeas y quironómidos, combinados con datos sedimentológicos y geoquímicos para reconstruir la historia ambiental de Laguna Las Vizcachas (50° 42&#8217; S; 71° 59&#8217; W; 1100 msnm), desde AD 400 hasta el presente. Nuestros resultados proporcionan evidencia de variabilidad climática durante los últimos AD 1600 . Entre los AD 400 a AD 1550, la presencia de polen de Poaceae junto con diatomeas planctónicas y pequeñas diatomeas bentónicas, sugiere un aumento gradual de la precipitación con temperaturas del aire frías y persistentes. Alrededor de los AD 1550, la disminución de Poaceae y el aumento de diatomeas bentónicas sugieren temperaturas aún más frías, lo cual es concordante con registros de avances glaciarios en la zona, probablemente asociados a la Pequeña Edad de Hielo. La aparición simultánea de morfotaxa de quironómidos indicadores de temperaturas frías como los Tanytarsini, apoya esta interpretación. Desde el año AD 1750 hasta el presente, la aparición de polen tipo Ranunculaceae, de quironómidos semi-terrestres y litorales y además de diatomeas epífitas sugieren la expansión de hábitats litorales que indican un descenso en el nivel de agua del lago, con menor precipitación que los años previos. Además, el aumento de las diatomeas planctónicas, Dicostella y Aulacoseira, y la fuerte disminución de pequeñas diatomeas bentónicas revelarían el inicio de un período de calentamiento. Por último, la aparición de polen de Rumex y Plantago se relaciona con la llegada temprana de los europeos y el posterior aumento de la actividad humana en la zona.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[pollen]]></kwd>
<kwd lng="en"><![CDATA[chironomids]]></kwd>
<kwd lng="en"><![CDATA[diatoms]]></kwd>
<kwd lng="en"><![CDATA[climatic variability]]></kwd>
<kwd lng="en"><![CDATA[last two millennia]]></kwd>
<kwd lng="en"><![CDATA[southern Patagonia]]></kwd>
<kwd lng="es"><![CDATA[polen]]></kwd>
<kwd lng="es"><![CDATA[quironómidos]]></kwd>
<kwd lng="es"><![CDATA[diatomeas]]></kwd>
<kwd lng="es"><![CDATA[variabilidad climática]]></kwd>
<kwd lng="es"><![CDATA[últimos dos milenios]]></kwd>
<kwd lng="es"><![CDATA[Patagonia sur]]></kwd>
</kwd-group>
</article-meta>
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