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dc.contributor.authorWangensteen, Owen S.-
dc.contributor.authorTuron, Xavier-
dc.contributor.authorGarcía-Cisneros, Álex-
dc.contributor.authorRecasens, Mireia-
dc.contributor.authorRomero, Javier-
dc.contributor.authorPalacín, Carlos-
dc.date.accessioned2011-12-21T11:43:38Z-
dc.date.available2011-12-21T11:43:38Z-
dc.date.issued2011-
dc.identifier.citationMarine Ecology Progresss Series 441 : 117-128 (2011)es_ES
dc.identifier.issn0171-8630-
dc.identifier.urihttp://hdl.handle.net/10261/43596-
dc.description12 páginas, 4 figuras, 6 tablas.es_ES
dc.description.abstractArbacia lixula and Paracentrotus lividus are the dominant sea urchins in the Mediterranean sublittoral, where they are key structuring species due to their grazing activity. It has been commonly accepted that competition between both species is minimized by specializing in different algal foods: A. lixula is considered to feed mainly on encrusting coralline algae, while P. lividus prefers fleshy macroalgae. We used stable isotope analysis to test if these species occupy different trophic positions at three western Mediterranean and one Macaronesian locations. Our results unambiguously show that A. lixula always occupies a higher trophic level than P. lividus, with a δ15N comparable in some locations to strict carnivores such as Actinia schmidti or Marthasterias glacialis. A temporal monitoring at one locality showed that this signature of a higher trophic level is consistent throughout the year. These results are incompatible with the current belief of an herbivorous diet for A. lixula and suggest that it must be considered an omnivore tending to carnivory in Mediterranean ecosystems, feeding at least partially on sessile animals such as Cirripedia, Hydrozoa or Bryozoa. A parallel analysis of gut contents showed a predominance of vegetal items in both species, although A. lixula consistently had a higher abundance of animal components than P. lividus. Our results challenge the validity of using gut content observations alone for characterizing the trophic behaviour of omnivorous marine invertebrates that feed on a variety of food sources with different digestibility.es_ES
dc.description.sponsorshipThis work has been funded by the projects CTM2007-66635, CTM2010-22218 from the Spanish Government, and the project BIOCON 08-187/09 from BBVA Foundation.es_ES
dc.language.isoenges_ES
dc.publisherInter Researches_ES
dc.rightsopenAccesses_ES
dc.subjectTrophic relationshipses_ES
dc.subjectStable isotope analysises_ES
dc.subjectBenthic communityes_ES
dc.subjectArbacia lixulaes_ES
dc.subjectParacentrotus lividuses_ES
dc.titleA wolf in sheep’s clothing: carnivory in dominant sea urchins in the Mediterraneanes_ES
dc.typeartículoes_ES
dc.identifier.doi10.3354/meps09359-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://dx.doi.org/10.3354/meps09359es_ES
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