Are invasive populations characterized by a broader diet than native populations?

dc.contributor.authorCourant, Julienen_ZA
dc.contributor.authorVogt, Solveigen_ZA
dc.contributor.authorMarques, Raquelen_ZA
dc.contributor.authorMeasey, Johnen_ZA
dc.contributor.authorSecondi, Jeanen_ZA
dc.contributor.authorRebelo, Ruien_ZA
dc.contributor.authorDe Villiers, Andreen_ZA
dc.contributor.authorIhlow, Floraen_ZA
dc.contributor.authorDe Busschere, Charlotteen_ZA
dc.contributor.authorBackeljau, Thierryen_ZA
dc.contributor.authorRodder, Dennisen_ZA
dc.contributor.authorHerrel, Anthonyen_ZA
dc.identifier.citationCourant, J., et al. 2017. Are invasive populations characterized by a broader diet than native populations?. PeerJ, 5:e3250, doi:10.7717/peerj.3250en_ZA
dc.identifier.issn2167-8359 (online)
dc.descriptionCITATION: Courant, J., et al. 2017. Are invasive populations characterized by a broader diet than native populations?. PeerJ, 5:e3250, doi:10.7717/peerj.3250.en_ZA
dc.descriptionThe original publication is available at https://peerj.comen_ZA
dc.description.abstractBackground. Invasive species are among the most significant threats to biodiversity. The diet of invasive animal populations is a crucial factor that must be considered in the context of biological invasions. A broad dietary spectrum is a frequently cited characteristic of invasive species, allowing them to thrive in a wide range of environments. Therefore, empirical studies comparing diet in invasive and native populations are necessary to understand dietary requirements, dietary flexibility, and the associated impacts of invasive species. Methods. In this study, we compared the diet of populations of the African clawed frog, Xenopus laevis in its native range, with several areas where it has become invasive. Each prey category detected in stomach contents was assigned to an ecological category, allowing a comparison of the diversity of ecological traits among the prey items in the diet of native and introduced populations. The comparison of diets was also performed using evenness as a niche breadth index on all sampled populations, and electivity as a prey selection index for three out of the six sampled populations. Results. Our results showed that diet breadth could be either narrow or broad in invasive populations. According to diet and prey availability, zooplankton was strongly preferred in most cases. In lotic environments, zooplankton was replaced by benthic preys, such as ephemeropteran larvae. Discussion. The relative proportions of prey with different ecological traits, and dietary variability within and between areas of occurrence, suggest that X. laevis is a generalist predator in both native and invasive populations. Shifts in the realized trophic niche are observed, and appear related to resource availability. Xenopus laevis may strongly impact aquatic ecosystems because of its near complete aquatic lifestyle and its significant consumption of key taxa for the trophic relationships in ponds.en_ZA
dc.format.extent16 pages : illustrationsen_ZA
dc.subjectAfrican clawed frogen_ZA
dc.subjectEcosystem scienceen_ZA
dc.titleAre invasive populations characterized by a broader diet than native populations?en_ZA
dc.description.versionPublisher's versionen_ZA
dc.rights.holderAuthors retain copyrighten_ZA

Files in this item


This item appears in the following Collection(s)