<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442015000600221</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v63i2.23156</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Densidad poblacional y distribución espacial de erizos de mar (Echinodermata: Echinoidea) en la Isla Socorro, Archipiélago de Revillagigedo, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Population density and spatial distribution of sea urchins (Echinodermata: Echinoidea) at Socorro island, Revillagigedo archipelago, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrero-Pérezrul]]></surname>
<given-names><![CDATA[María Dinorah]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Ortíz]]></surname>
<given-names><![CDATA[Georgina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosales-Estrada]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Bonilla]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Ciencias Marinas ]]></institution>
<addr-line><![CDATA[La Paz ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada Departamento de Oceanografía Biológica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Guadalajara Departamento de Ingeniería de Proyectos Centro de Ingeniería Ambiental]]></institution>
<addr-line><![CDATA[Zapopan Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma de Baja California Sur Departamento de Biologia Marina ]]></institution>
<addr-line><![CDATA[La Paz ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2015</year>
</pub-date>
<volume>63</volume>
<fpage>221</fpage>
<lpage>232</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442015000600221&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442015000600221&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442015000600221&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los estudios sobre los equinodermos de la costa del Pacifico de México se han enfocado en la taxonomía y biogeografía y hay escasos datos sobre ecología comunitaria o poblacional del grupo. En el presente trabajo analizamos los cambios estacionales de la densidad poblacional y la distribución espacial de cuatro especies de erizos regulares (Diadema mexicanum, Echinometra mathaei oblonga. Eucidaris thouarsii y Tripneustes depressus) en tres bahías de la Isla Socorro, Archipiélago de Revillagigedo, México. Las especie más abundante en la isla fue E. mathaei oblonga (3.96 + 0.83 ind m-2; promedio y error típico), seguida de D. mexicanum (2.13 + 0.59 ind m-2), T. depressus y E. thouarsii (entre 0.50 y 0.11 ind m-2, respectivamente). La Bahía Binners tuvo la mayor densidad con 15.98 + 0.43 ind m-2, en gran medida debido a la alta incidencia de E. mathaei oblonga en el sitio. Estacionalmente, T. depressus y E. thouarsii no variaron significativamente su abundancia durante el año, pero D. mexicanum fue más abundante en invierno-primavera, y E. mathaei oblonga en el otoño. En relación al patrón de distribución espacial, dos de las especies (D. mexicanum y E. mathaei oblonga) presentaron una distribución agregada a lo largo del año y en las tres localidades de estudio, pero los otros dos equinoideos se dispusieron de forma azarosa. Hay varias razones para explicar el comportamiento de agregación en erizos de mar, pero para el caso de Isla Socorro aquí se argumenta a favor de que es un modo de defensa contra los abundantes peces depredadores que habitan los arrecifes. En contraste, las especies que no muestran agrupaciones residen en refugios durante el día (E. thouarsii) o bien su morfología y tamaño dificultan su captura por los peces (T. depressus).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The studies on echinoderms of the Mexican Pacific have focused on taxonomy and biogeography, and there are limited data on their ecology. We used transect to study Diadema mexicanum, Echinometra mathaei oblonga, Eucidaris thouarsii and Tripneustes depressus at three bays in Socorro Island, Revillagigedo Archipelago, Mexico (1989 and 1990). The most abundant species in the island was E. mathaei oblonga (3.96 + 0.83 ind m-2; average and standard error), followed by D. mexicanum (2.13 + 0.59 ind m-2), T. depressus and E. thouarsii (between 0.50 and 0.11 ind m-2, respectively). Binners Bay had the highest density with 15.98 + 0.43 ind m-2, mostly due to the high incidence of E. mathaei oblonga at the site. Seasonally, T. depressus and E. thouarsii did not significantly varied its abundance during the year, while D. mexicanum was more abundant in winter-spring, and E. mathaei oblonga in the fall. Two species (D. mexicanum and E. mathaei oblonga) had an aggregated distribution along the year and in the three study locations, but the other two echinoids followed a random distribution. This may be a defense against the abundant predatory fishes. In contrast, the species that do not aggregate inhabit in refuges during the day (E. thouarsii), or their shape and size makes them difficult to capture by fishes (T. depressus). Rev. Biol. Trop. 63 (Suppl. 2): 221-232. Epub 2015 June 01.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Diadema mexicanum]]></kwd>
<kwd lng="es"><![CDATA[Tripneustes depressus]]></kwd>
<kwd lng="es"><![CDATA[Echinometra mathaei oblonga]]></kwd>
<kwd lng="es"><![CDATA[Eucidaris thouarsii]]></kwd>
<kwd lng="es"><![CDATA[Prueba estadística varianza/media]]></kwd>
<kwd lng="es"><![CDATA[Islas oceánicas]]></kwd>
<kwd lng="en"><![CDATA[Diadema mexicanum]]></kwd>
<kwd lng="en"><![CDATA[Tripneustes depressus]]></kwd>
<kwd lng="en"><![CDATA[Echinometra mathaei oblonga]]></kwd>
<kwd lng="en"><![CDATA[Eucidaris thouarsii]]></kwd>
<kwd lng="en"><![CDATA[Variance/mean statistical test]]></kwd>
<kwd lng="en"><![CDATA[Oceanic islands]]></kwd>
</kwd-group>
</article-meta>
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