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dc.contributor.authorVogt, S.
dc.contributor.authorde Villiers, F.A.
dc.contributor.authorIhlow, F.
dc.contributor.authorRodder, D.
dc.contributor.authorMeasey, J.
dc.date.accessioned2017-05-24T09:50:27Z
dc.date.available2017-05-24T09:50:27Z
dc.date.issued2017
dc.identifier.citationVogt, S.; de Villiers, F.A.; Ihlow, F.; Rodder, D.; Measey, J. (2017) Competition and feeding ecology in two sympatric Xenopus species (Anura: Pipidae) PeerJ, 5: e3130en
dc.identifier.issn2167-8359
dc.identifier.urihttp://hdl.handle.net/123456789/2259
dc.description.abstractThe widespread African clawed frog (Xenopus laevis) occurs in sympatry with the IUCN Endangered Cape platanna (Xenopus gilli) throughout its entire range in the south-western Cape, South Africa. In order to investigate aspects of the interspecific competition between populations of X. laevis and X. gilli, an assessment of their niche differentiation was conducted through a comprehensive study on food composition and trophic niche structure at two study sites: the Cape of Good Hope (CoGH) and Kleinmond. A total of 399 stomach contents of X. laevis (n = 183) and X. gilli (n = 216) were obtained together with samples of available prey to determine food preferences using the Electivity index (E*), the Simpson's index of diversity (1-D), the Shannon index (H'), and the Pianka index (Ojk ). Xenopus gilli diet was more diverse than X. laevis, particularly in Kleimond where the Shannon index was nearly double. Both species were found to consume large amounts of tadpoles belonging to different amphibian species, including congeners, with an overall higher incidence of anurophagy than previously recorded. However, X. laevis also feeds on adult X. gilli, thus representing a direct threat for the latter. While trophic niche overlap was 0.5 for the CoGH, it was almost 1 in Kleinmond, suggesting both species utilise highly congruent trophic niches. Further, subdividing the dataset into three size classes revealed overlap to be higher in small frogs in both study sites. Our study underlines the importance of actively controlling X. laevis at sites with X. gilli in order to limit competition and predation, which is vital for conservation of the south-western Cape endemic.en
dc.format.extent247105 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherCreative Commons CC-BY 4.0en
dc.subjectDieten
dc.subjectCannibalismen
dc.subjectAlien speciesen
dc.subjectThreatened speciesen
dc.subjectForagingen
dc.subjectInterspecific competitionen
dc.subjectTrophic nicheen
dc.subjectInvasive speciesen
dc.titleCompetition and feeding ecology in two sympatric Xenopus species (Anura: Pipidae)en
dc.typeArticleen


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