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dc.creatorCabanillas Terán, Nancy
dc.creatorLoor Andrade, Peggy
dc.creatorRodríguez Barreras, Ruber
dc.creatorCortés Núñez, Jorge
dc.date.accessioned2017-09-06T20:37:15Z
dc.date.available2017-09-06T20:37:15Z
dc.date.issued2016-01-14
dc.identifier.citationhttps://peerj.com/articles/1578/es_ES
dc.identifier.issn2167-8359
dc.identifier.urihttp://hdl.handle.net/10669/73131
dc.description.abstractSea urchins are important grazers and influence reef development in the Eastern Tropical Pacific (ETP). Diadema mexicanum and Eucidaris thouarsii are the most important sea urchins on the Ecuadorian coastal reefs. This study provided a trophic scenario for these two species of echinoids in the coral-rocky reef bottoms of the Ecuadorian coast, using stable isotopes. We evaluated the relative proportion of algal resources assimilated, and trophic niche of the two sea urchins in the most southern coral-rocky reefs of the ETP in two sites with different disturbance level. Bayesian models were used to estimate the contribution of algal sources, niche breadth, and trophic overlap between the two species. The sea urchins behaved as opportunistic feeders, although they showed differential resource assimilation. Eucidaris thouarsii is the dominant species in disturbed environments; likewise, their niche amplitude was broader than that of D. mexicanum when conditions were not optimal. However, there was no niche overlap between the species. The Stable Isotope Analysis in R (SIAR) indicated that both sea urchins shared limiting resources in the disturbed area, mainly Dictyota spp. (contributions of up to 85% for D. mexicanum and up to 75% for E. thouarsii). The Stable Isotope Bayesian Ellipses in R (SIBER) analysis results indicated less interspecific competition in the undisturbed site. Our results suggested a trophic niche partitioning between sympatric sea urchin species in coastal areas of the ETP, but the limitation of resources could lead to trophic overlap and stronger habitat degradation.es_ES
dc.description.sponsorshipDepartamento Central de Investigación, Universidad Laica Eloy Alfaro de Manabí/[CUP: 91740000.0000.375395]/DCI/Ecuadores_ES
dc.language.isoen_USes_ES
dc.sourcePeerJ 4: e1578. 2016es_ES
dc.subjectDiadema mexicanumes_ES
dc.subjectEastern Tropical Pacifices_ES
dc.subjectEucidaris thouarsiies_ES
dc.subjectNiche breadthes_ES
dc.subjectRocky reefses_ES
dc.subjectStable isotopeses_ES
dc.titleTrophic ecology of sea urchins in coral-rocky reef systems, Ecuadores_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.typeArtículo científicoes_ES
dc.identifier.doi10.7717/peerj.1578
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Ciencias del Mar y Limnología (CIMAR)es_ES
dc.identifier.pmid26839748


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