<?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>S0034-77442021000500501</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v69isuppl.1.46392</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Locomotion and righting behavior of sea stars: a study case on the bat star Asterina stellifera (Asterinidae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Comportamiento de locomoción y enderezamiento en estrellas de mar: un caso de estudio sobre la estrella Asterina stellifera (Asterinidae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meretta]]></surname>
<given-names><![CDATA[Pablo-E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rezende-Ventura]]></surname>
<given-names><![CDATA[Carlos-Renato]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Mar del Plata Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina ]]></institution>
<addr-line><![CDATA[ Buenos Aires]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal do Rio de Janeiro Laboratório de Echinodermata, Museu Nacional ]]></institution>
<addr-line><![CDATA[ Rio de Janeiro]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>69</volume>
<fpage>501</fpage>
<lpage>513</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442021000500501&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442021000500501&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442021000500501&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  The locomotion behavior of an organism involves the integration of aspects like body symmetry, sensory and locomotor systems. Furthermore, various ecological factors seem to be related to locomotion characteristics, such as foraging strategy, migration trends, response to predators and competitors, and environmental stress.  Objective:  To analyze locomotion and the influence of body symmetry in the crawling and righting movements of the sea star Asterina stellifera.  Methods:  We carried out laboratory experiments in aquariums in the presence/absence of water current and on a horizontal and vertical surface.  Results:  The speed is similar to speed in other species of similar size. Both the speed and linearity of displacement were independent of individual body size. A water current leads to faster crawling and straight paths, but there is no rheotaxis: streams do not affect locomotion. Speed and linearity of displacement were independent of individual body size. The displacement pattern described here may be an adaptation of organisms that present dense populations in communities with high prey abundance, as is the case of A. stellifera.  Conclusions:  Like other asteroids, this species did not show an Anterior/Posterior plane of symmetry during locomotion, or righting movement: it does not tend to bilaterality.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  El comportamiento de locomoción de un organismo implica la integración de aspectos como la simetría corporal, los sistemas sensorial y locomotor. Además, varios factores ecológicos parecen estar relacionados con las características de la locomoción, como la estrategia de alimentación, las tendencias migratorias, la respuesta a los depredadores y competidores y el estrés ambiental.  Objetivo:  Analizar el patrón general de locomoción y la influencia de la simetría corporal en la locomoción y enderezamiento de la estrella de mar Asterina stellifera.  Métodos:  Realizamos experimentos de laboratorio en acuarios en presencia / ausencia de corriente de agua y en superficie horizontal y vertical.  Resultados:  La velocidad es similar a la velocidad en otras especies de tamaño similar. Tanto la velocidad como la linealidad del desplazamiento fueron independientes del tamaño corporal individual. Una corriente de agua conduce a una velocidad de desplazamiento mayor y a trayectorias más rectas, pero no hay reotaxis: una corriente de agua no afecta el patrón de locomoción. La velocidad y la linealidad del desplazamiento fueron independientes del tamaño corporal individual. El patrón de desplazamiento aquí descrito puede ser una adaptación de organismos que presentan densas poblaciones en comunidades con alta abundancia de presas, como es el caso de A. stellifera.  Conclusiones:  Al igual que otros asteroides, esta especie no mostró un plano de simetría Anterior / Posterior durante la locomoción o el movimiento de enderezamiento: no tiende a la bilateralidad.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[crawling]]></kwd>
<kwd lng="en"><![CDATA[orientation]]></kwd>
<kwd lng="en"><![CDATA[bilaterality]]></kwd>
<kwd lng="en"><![CDATA[Asteroidea]]></kwd>
<kwd lng="en"><![CDATA[rheotaxis]]></kwd>
<kwd lng="en"><![CDATA[gravitaxis]]></kwd>
<kwd lng="es"><![CDATA[locomoción]]></kwd>
<kwd lng="es"><![CDATA[orientación]]></kwd>
<kwd lng="es"><![CDATA[bilateralidad]]></kwd>
<kwd lng="es"><![CDATA[Asteroidea]]></kwd>
<kwd lng="es"><![CDATA[reotaxis]]></kwd>
<kwd lng="es"><![CDATA[gravitaxis]]></kwd>
</kwd-group>
</article-meta>
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