<?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>S0034-77442024000200010</article-id>
<article-id pub-id-type="doi">10.15517/rev.biol.trop..v72is1.59008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Abundancia, densidad y estructura de tallas de Mellitella stokesii (Echinolampadacea: Mellitidae) en playones del estero El Tamarindo, El Salvador]]></article-title>
<article-title xml:lang="en"><![CDATA[Abundance, density and size structure of Mellitella stokesii (Echinolampadacea: Mellitidae) in sandbanks of El Tamarindo estuary, El Salvador]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Cáceres]]></surname>
<given-names><![CDATA[María-Fernanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Segovia-Prado]]></surname>
<given-names><![CDATA[Johanna-Vanessa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Francisco Gavidia Instituto de Ciencia, Tecnología e Innovación ]]></institution>
<addr-line><![CDATA[ San Salvador]]></addr-line>
<country>El Salvador</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Francisco Gavidia Centro de Investigación Marina y Limnológica ]]></institution>
<addr-line><![CDATA[ San Salvador]]></addr-line>
<country>El Salvador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2024</year>
</pub-date>
<volume>72</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442024000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442024000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442024000200010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Los equinoideos irregulares se caracterizan por tener una selección del sustrato en fondos blandos principalmente. En El Salvador se han registrado siete especies de equinoideos irregulares en las principales playas arenosas del país, M. stokesii es una de ellas.  Objetivo:  Determinar la abundancia, densidad y estructura de tallas, en playones de la bocana del estero El Tamarindo, El Salvador. Métodos: La investigación se realizó en época seca en el oriente del país en playones del estero El Tamarindo que se caracteriza por presentar grandes extensiones de arena mezclada con materia orgánica. En cada sitio, se trazaron transectos en banda paralelos a la costa mediante 9 cuadrantes de 10 m2 separados entre sí por 10 m (área total de 90 m2), en donde se contabilizaron y midieron los individuos de M. stokesii que se encontraran dentro del área delimitada.  Resultados:  Se contabilizaron 958 individuos de M. stokesii con una densidad total de 10.64 ± 13.22 ind/m2. El rango de tamaños fue de 1-6.5 cm. El hábitat se caracterizó por presentar arena con materia orgánica en los primeros mm del sustrato en compañía de otros invertebrados.  Conclusiones:  La abundancia y densidad de M. stokesii es similar a la registrada en otros estudios de la región.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Irregular echinoids are characterized by having a selection of the substrate mainly on soft bottoms. In El Salvador, seven species of irregular echinoids have been recorded on the main sandy beaches of the country, M. stokesii is one of them.  Objective:  Determine the abundance, density and size structure of M. stokesii on beaches at the mouth of the El Tamarindo estuary, El Salvador.  Methods:  The research was carried out in the dry season in the east of the country on the beaches of the El Tamarindo estuary, which is characterized by large extensions of sand mixed with organic matter. At each site, band transects parallel to the coast were plotted by 9 quadrants of 10 m2 separated from each other by 10 m (total area of 90 m2), where individuals of M. stokesii found within the delimited area were counted and measured.  Results:  958 individuals of M. stokesii were counted with a total density of 10.64 ± 13.22 ind/m2. The size range was 1-6.5 cm. The habitat was characterized by presenting sand with organic matter in the first mm of the substrate in the company of other invertebrates.  Conclusions:  The abundance and density of M. stokesii are similar to the ones recorded in other studies in the region.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[conservation]]></kwd>
<kwd lng="en"><![CDATA[size structure]]></kwd>
<kwd lng="en"><![CDATA[habitat: density]]></kwd>
<kwd lng="en"><![CDATA[irregular echinoids.]]></kwd>
<kwd lng="es"><![CDATA[conservación]]></kwd>
<kwd lng="es"><![CDATA[estructura de tallas]]></kwd>
<kwd lng="es"><![CDATA[hábitat]]></kwd>
<kwd lng="es"><![CDATA[densidad]]></kwd>
<kwd lng="es"><![CDATA[equinoideos irregulares.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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