<?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>1870-3453</journal-id>
<journal-title><![CDATA[Revista mexicana de biodiversidad]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Biodiv.]]></abbrev-journal-title>
<issn>1870-3453</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-34532020000100214</article-id>
<article-id pub-id-type="doi">10.22201/ib.20078706e.2020.91.3313</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Summarizing abundance changes in waterbirds: some problems and a possible solution]]></article-title>
<article-title xml:lang="es"><![CDATA[Resumiendo los cambios en abundancia de las aves acuáticas: algunos problemas y una posible solución]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Oreja]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zuberogoitia]]></surname>
<given-names><![CDATA[Iñigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Facultad de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Puebla Puebla]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Estudios Medioambientales Icarus S.L.  ]]></institution>
<addr-line><![CDATA[Bilbao ]]></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>
<volume>91</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532020000100214&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532020000100214&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532020000100214&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract After conducting replicated counts of migratory waterbirds at a given wetland, some authors choose to compute the mean abundance throughout the study period, whereas others report the peak value or the cumulative total. Here, we use fictitious and real examples to illustrate how some of these procedures can lead to distorted conclusions. For species with skewed abundance distributions, the mean does not summarize the central tendency in the data, and the median should be used; however, for many migratory waterbirds, median abundances at a given site can be null. Also, the probability of double-counting the same individuals increases when replicated surveys cover a long time. Moreover, since the cumulative abundance of a species/assemblage increases with the number of surveys, misleading results can be obtained if researchers apply different sampling efforts. Finally, the ranking and selection of wetlands for waterbird conservation can be misguided if cumulative totals are compared against standard criteria (i.e., Ramsar sites, IBAs). To avoid the above mentioned problems, we propose to use the maximum, peak abundance of a given waterbird species during the course of the study, or the sum of maxima, peak values across all the species in the same waterbird assemblage.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Después de censar en repetidas ocasiones a las aves migratorias de un humedal, algunos autores optan por calcular la abundancia media a lo largo del tiempo estudiado, mientras que otros consideran el valor máximo, o el total acumulado. Mediante ejemplos reales y ficticios, ilustramos aquí cómo algunos de estos procedimientos pueden inducir a errores no intencionados en materia de ecología y conservación de aves acuáticas. En especies con distribuciones de abundancia sesgadas, la media no resume la tendencia central de los datos, por lo que debería usarse la mediana; pero para muchas aves acuáticas migratorias, la mediana de sus abundancias en un humedal determinado puede ser cero. Además, la probabilidad de contar por duplicado a los mismos individuos aumenta cuando el tiempo estudiado es largo. Es más, se pueden obtener resultados erróneos si se utilizan diferentes esfuerzos de muestreo, ya que la abundancia acumulada de una especie o de una comunidad, aumenta con el número de censos. En fin, la priorización y selección de humedales para la conservación de las aves acuáticas puede realizarse de modo equivocado si las abundancias totales acumuladas se comparan con los criterios estandarizados del programa Ramsar o de los sitios IBA. De cara a evitar estos problemas, sugerimos utilizar la abundancia máxima de una especie de ave acuática registrada a lo largo del tiempo estudiado, o la suma de los máximos para todas las especies de aves acuáticas en la misma comunidad.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Wetlands]]></kwd>
<kwd lng="en"><![CDATA[Migratory birds]]></kwd>
<kwd lng="en"><![CDATA[Number of individuals]]></kwd>
<kwd lng="en"><![CDATA[Peak abundance]]></kwd>
<kwd lng="en"><![CDATA[Cumulative total]]></kwd>
<kwd lng="en"><![CDATA[Ecology]]></kwd>
<kwd lng="en"><![CDATA[Conservation]]></kwd>
<kwd lng="es"><![CDATA[Humedales]]></kwd>
<kwd lng="es"><![CDATA[Aves migratorias]]></kwd>
<kwd lng="es"><![CDATA[Número de individuos]]></kwd>
<kwd lng="es"><![CDATA[Abundancia máxima]]></kwd>
<kwd lng="es"><![CDATA[Abundancia acumulada]]></kwd>
<kwd lng="es"><![CDATA[Ecología]]></kwd>
<kwd lng="es"><![CDATA[Conservación]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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