<?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>1870-7459</journal-id>
<journal-title><![CDATA[Huitzil]]></journal-title>
<abbrev-journal-title><![CDATA[Huitzil]]></abbrev-journal-title>
<issn>1870-7459</issn>
<publisher>
<publisher-name><![CDATA[Sociedad para el Estudio y Conservación de las Aves en México, A.C. (CIPAMEX)]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-74592018000100022</article-id>
<article-id pub-id-type="doi">10.28947/hrmo.2018.19.1.308</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Non-breeding distribution, density and population structure of American Avocet (Recurvirostra americana , Gmelin 1789) in Marismas Nacionales, Nayarit, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Distribución invernal, densidad y estructura poblaciona de Avoceta americana (Recurvirostra americana, Gmelin 1789) en Marismas Nacionales, Nayarit, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molina]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cavitt]]></surname>
<given-names><![CDATA[John]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carmona]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Nieto]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur Posgrado en Ciencias Marinas y Costeras ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Weber State University Avian Ecology Lab ]]></institution>
<addr-line><![CDATA[Ogden UT]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur Departamento de Biología Marina ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Pronatura Noroeste, A.C. Programa de Conservación de Aves ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Coras-BIO Consultores, S.C.  ]]></institution>
<addr-line><![CDATA[Tepic Nayarit]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>19</volume>
<numero>1</numero>
<fpage>22</fpage>
<lpage>32</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-74592018000100022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-74592018000100022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-74592018000100022&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Marismas Nacionales wetland system (Nayarit, Mexico) is a Site of International Importance as designated by the Western Hemispheric Shorebird Reserve Network. The American Avocet (Recurvirostra americana) is one of the most numerous shorebirds in the area; nevertheless, there is little information about its overwintering stay at Marismas Nacionales, despite part of the site being decreed as a Biosphere Reserve. In order to clarify some aspects of American Avocet winter ecology, we used transects and scanning sampling method during the winter: to determine distribution and abundance in the Marismas Nacionales (2010-2011), as well as density and population structure in one of the sectors of the Biosphere Reserve (2011-2013). The American Avocet wintering population in the Biosphere Reserve was calculated to be about 26,000 individuals (5.7% of the world&#8217;s population), but approximately 36% of avocet wintering population in Marismas Nacionales was outside of the reserve, also there was a certain preference for some wetlands. Evidence suggests that spring migration starts during the first weeks of March. We observed some spatial segregation between sexes, but our results, although valid, are inconclusive because of difficulties in sexing individuals in the field. In spite of local changes in these wetlands, American Avocet winter population has apparently been relatively stable over the last twenty years. Therefore, Marismas Nacionales remains a key wetland for American Avocet in North America.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El sistema estuarino-lagunar Marismas Nacionales (México) es un Sitio de Importancia Internacional designado por la Red Hemisférica de Reservas de Aves Playeras. La Avoceta americana (Recurvirostra americana) es una de las aves playeras invernantes más numerosas en el área. Sin embargo hay poca información sobre su estancia invernal en el sitio, a pesar de que el sitio fue decretado Reserva de la Biosfera. En este estudio determinamos, a través de trayectos y muestreo de barrido durante el invierno (noviembre-marzo), la distribución y abundancia en las Marismas Nacionales (2010-2011), así como densidad y estructura de población en uno de los sectores de la Reserva de la Biosfera durante 2011-2013. Estimamos en 26,000 individuos la población invernante de Avoceta Americana en la Reserva de la Biosfera (5.7% de la población mundial), pero aproximadamente el 36% de la población invernante la observamos en sitios fuera del polígono de la reserva. La evidencia sugiere que la migración de primavera comenzó durante las primeras semanas de marzo. Hemos observado alguna segregación espacial entre los sexos, pero nuestros resultados, aunque válidos, no son concluyentes debido a la dificultad de identificación de los sexos en algunos individuos. A pesar de los cambios en estos humedales, la población invernante de Avoceta americana ha permanecido relativamente estable en los últimos veinte años. Por lo que Marismas Nacionales sigue siendo un humedal clave para la Avoceta americana en Norteamérica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Recurvirostridae]]></kwd>
<kwd lng="en"><![CDATA[shorebirds]]></kwd>
<kwd lng="en"><![CDATA[wintering]]></kwd>
<kwd lng="en"><![CDATA[North America]]></kwd>
<kwd lng="en"><![CDATA[wetlands]]></kwd>
<kwd lng="es"><![CDATA[Recurvirostridae]]></kwd>
<kwd lng="es"><![CDATA[aves playeras]]></kwd>
<kwd lng="es"><![CDATA[invernación]]></kwd>
<kwd lng="es"><![CDATA[Norteamérica]]></kwd>
<kwd lng="es"><![CDATA[humedales]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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