<?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>S1405-33222018000100079</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2018v70n1a5</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Reconstruction of past climatic events using oxygen isotopes in Washingtonia robusta growing in three anthropic oases in Baja California Sur]]></article-title>
<article-title xml:lang="es"><![CDATA[Reconstrucción de eventos climáticos del pasado mediante isotopía de oxígeno en Washingtonia robusta de tres oasis antrópicos en Baja California Sur]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Ballesté]]></surname>
<given-names><![CDATA[Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ezcurra]]></surname>
<given-names><![CDATA[Exequiel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología ]]></institution>
<addr-line><![CDATA[Cd. Mx. ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of California  ]]></institution>
<addr-line><![CDATA[ CA]]></addr-line>
<country>USA</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>79</fpage>
<lpage>94</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222018000100079&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222018000100079&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222018000100079&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The term Anthropocene has been suggested to describe the epoch in which changes in Earth systems can be clearly attributable to human activities. The oasis ecosystems of the Baja California Peninsula provide a good example of the transformations that human activities can produce in an ecosystem over centuries of use. These sites, which are located in the northwestern desert of Mexico, are a refuge for a great diversity of species. At the same time, they are important for human subsistence, which has exerted pressure on the water resources of these ecosystems since humans settled in these locations following the arrival on the American continent. To reconstruct the changes in hydrological conditions in these ecosystems and their relationship with climatic patterns and human activities during the last century, we measured &#948;18O isotopes in the stem cellulose of the longlived palm Washingtonia robusta in three Baja California Sur oases. Samples were collected at different heights from the base to the top (i.e., from the oldest part of the stem to the youngest) of each palm and from different water sources. The oxygen isotope values of W. robusta appear to be influenced mainly by intense climatic anomalies. Some El Niño Southern Oscillation (ENSO) events were recorded in the isotope signals of the palms, such as La Niña drought event that occurred between 1942 and 1957 and caused an evident increase in the &#948;18O of the palms of the San Ignacio oasis. However, other ENSO events did not produce isotope changes in the palms. We propose that the hydrological characteristics of the oases, as well as agricultural irrigation, likely maintained constant moisture conditions that caused the observed stability of the 18O/16O isotope ratios in the palms and limited the evidence of climatic anomalies that these palms provide. Although W. robusta can serve as a reasonable proxy for climate reconstructions, improvements in our understanding are needed; e.g., more accurate methods for estimating the ages of palms and more knowledge of the effects of other factors related to the hydrological cycles of oases.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El término Antropoceno ha sido propuesto para describir la época en que los cambios en sistemas terrestres pueden ser claramente atribuibles a las actividades humanas. Los oasis de la península de Baja California son un buen ejemplo de las transformaciones que las actividades humanas pueden producir en un ecosistema durante un largo período de tiempo. Estos sitios, ubicados en el desierto del noroeste de México, son refugio para una gran diversidad de especies. Al mismo tiempo, son importantes para la subsistencia humana, que ha ejercido presión sobre los recursos hídricos de estos ecosistemas desde que los humanos se establecieron en estos lugares después de su llegada al continente Americano. Para reconstruir los cambios hidrológicos en estos ecosistemas y su relación con los patrones climáticos y las actividades humanas durante el último siglo, medimos los isótopos de &#948;18O en la celulosa del tallo de las palmas de vida larga, Washingtonia robusta, en tres oasis de Baja California Sur. Las muestras de madera se colectaron a diferentes alturas desde la base hasta la parte superior (es decir, desde la parte más antigua del tallo hasta la parte más joven del mismo) de cada palma y también se obtuvieron muestras de agua de diferentes fuentes presentes en los sitios de estudio. Los valores de isótopos de oxígeno de W. robusta parecen estar influidos principalmente por anomalías climáticas intensas. Algunos eventos de El Niño (El Niño Southern Oscillation, ENSO) fueron registrados en las señales isotópicas de las palmas, así como un evento de La Niña que ocurrió entre 1942 y 1957 y causó un aumento evidente en los isótopos &#948;18O de las palmas del oasis de San Ignacio. Sin embargo, otros eventos ENSO no produjeron cambios isotópicos en las palmas. Proponemos que la infraestructura hidráulica de los oasis incluido el riego agrícola, posiblemente mantuvo condiciones de humedad constantes que causaron una estabilidad en la proporción de isótopos 18O/16O en las palmas y limitaron la evidencia isotópica de las anomalías climáticas en la celulosa de las palmas. Aunque la evidencia isotópica de W. robusta puede ser utilizada como una aproximación razonable para las reconstrucciones climáticas, se necesita encontrar métodos más precisos para estimar la edad de las palmas y un conocimiento más cercano de otros factores relacionados con los ciclos hidrológicos de los oasis.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[oxygen isotopes]]></kwd>
<kwd lng="en"><![CDATA[oasis]]></kwd>
<kwd lng="en"><![CDATA[Baja California]]></kwd>
<kwd lng="en"><![CDATA[ENSO]]></kwd>
<kwd lng="en"><![CDATA[palm]]></kwd>
<kwd lng="en"><![CDATA[climatic anomalies]]></kwd>
<kwd lng="es"><![CDATA[isótopos de oxígeno]]></kwd>
<kwd lng="es"><![CDATA[oasis]]></kwd>
<kwd lng="es"><![CDATA[Baja California]]></kwd>
<kwd lng="es"><![CDATA[ENSO]]></kwd>
<kwd lng="es"><![CDATA[palma]]></kwd>
<kwd lng="es"><![CDATA[anomalías climáticas]]></kwd>
</kwd-group>
</article-meta>
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