<?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>S0034-77442024000200005</article-id>
<article-id pub-id-type="doi">10.15517/rev.biol.trop..v72is1.58676</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Noble hosts: effects of internal parasites on the physiology of an intertidal brooding Sea-star]]></article-title>
<article-title xml:lang="es"><![CDATA[Huéspedes nobles: los efectos de parásitos internos en la fisiología de una estrella de mar incubadora del intermareal]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fraysse]]></surname>
<given-names><![CDATA[Cintia-Pamela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Boy]]></surname>
<given-names><![CDATA[Claudia-Clementina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Veyñ]]></surname>
<given-names><![CDATA[Marianela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Farias]]></surname>
<given-names><![CDATA[Ayelen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[Analía-Fernanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Centro Austral de Investigaciones Científicas (CADIC) Laboratorio de Ecología, Fisiología y Evolución de Organismos Acuáticos]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Maimónides Centro de Ciencias Naturales, Ambientales y Antropológicas (CCNAA) Laboratorio de Invertebrados Marinos, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)]]></institution>
<addr-line><![CDATA[ Ciudad Autónoma de Buenos Aires]]></addr-line>
<country>Argentina</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=S0034-77442024000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442024000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442024000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The endoparasite Dendrogaster argentinensis infects the intertidal brooder sea star Anasterias antarctica. This sea-star species is in the highest trophic level in the Beagle Channel.  Objective:  To study the effects of parasitism by D. argentinensis on the fitness and reproduction of A. antarctica.  Methods:  Adults from the brooder sea-star were collected from the rocky intertidal of Ensenada Zaratiegui bay (54°51&#8217; S &amp; 68°29&#8217; W), Argentina. Eight seasonal samplings were performed (four seasons in two years) in the upper and low intertidal. During dissection, parasites were removed, and all organs were extracted and weighed separately.  Results: Dendrogaster argentinensis prevalence was the highest for the region (20.4 %). Parasitized individuals were more frequent in the low intertidal in all seasons, with a higher difference in summer, where it is likely that the higher temperatures and strong winds could make the upper intertidal more challenging for a parasitized individual. Five parasitized individuals were castrated. Generally, the gonadal (GI) and somatic (pyloric caeca, PCI; stomach, SI; body wall, WI) indexes were lower in parasitized than non-parasitized individuals.  Conclusions:  Parasitism by D. argentinensis negatively affects A. antarctica condition. It affects reproduction because it reduces the GI, and can also produce castration. The parasite competes for the sea-stars&#8217; energetic resources, also decreasing the individual&#8217;s capacity for feeding (reduced stomach) and growth (reduced body wall).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  El endoparásito Dendrogaster argentinensis infecta a la estrella de mar Anasterias antarctica, especie que se encuentra en el nivel trófico más alto del Canal Beagle.  Objetivo:  Estudiar los efectos del parasitismo de D. argentinensis en la condición fisiológica y reproducción de A. antarctica.  Métodos:  Adultos de la estrella de mar incubadora fueron recogidos del intermareal rocoso de la bahía Ensenada Zaratiegui (54°51&#8217; S &amp; 68°29&#8217; W). Se realizaron ocho muestreos estacionales (cuatro temporadas en dos años) en el intermareal superior y bajo. Durante la disección, se removieron los parásitos, y todos los órganos, los cuales fueron pesados por separado.  Resultados:  La prevalencia de D. argentinensis fue la más alta de la región (20.4 %). Los individuos parasitados fueron más frecuentes en el intermareal bajo en todas las estaciones, siendo la mayor diferencia en verano, donde es probable que las temperaturas más altas y los fuertes vientos puedan hacer que el intermareal superior sea más desafiante para un individuo parasitado. Se observaron cinco individuos parasitados que estaban castrados. Generalmente, los índices gonadales (GI) y somáticos (ciego pilórico, estómago, y pared del cuerpo) fueron menores en los individuos parasitados que no parasitados.  Conclusiones:  El parasitismo de D. argentinensis afecta negativamente la condición fisiológica de A. antarctica. Afecta a la reproducción en términos de bajo GI y puede causar castración. El parásito compite por los recursos energéticos de las estrellas de mar, disminuyendo también la capacidad del individuo para alimentarse (reducción del estómago) y crecer (reducción de la pared del cuerpo).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Asteroidea]]></kwd>
<kwd lng="en"><![CDATA[Ascothoracida]]></kwd>
<kwd lng="en"><![CDATA[parasite]]></kwd>
<kwd lng="en"><![CDATA[gonadal index]]></kwd>
<kwd lng="en"><![CDATA[somatic indexes]]></kwd>
<kwd lng="en"><![CDATA[prevalence]]></kwd>
<kwd lng="en"><![CDATA[Beagle Channel.]]></kwd>
<kwd lng="es"><![CDATA[Asteroidea]]></kwd>
<kwd lng="es"><![CDATA[Ascothoracida]]></kwd>
<kwd lng="es"><![CDATA[parásito]]></kwd>
<kwd lng="es"><![CDATA[índice gonadal]]></kwd>
<kwd lng="es"><![CDATA[índices somáticos]]></kwd>
<kwd lng="es"><![CDATA[prevalencia]]></kwd>
<kwd lng="es"><![CDATA[Canal Beagle.]]></kwd>
</kwd-group>
</article-meta>
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