Behavioral and trophic segregations help the Tahiti petrel to cope with the abundance of wedge-tailed shearwater when foraging in oligotrophic tropical waters

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Version: author
License: CC BY 4.0
Serval ID
serval:BIB_884B6D3DA05C
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Behavioral and trophic segregations help the Tahiti petrel to cope with the abundance of wedge-tailed shearwater when foraging in oligotrophic tropical waters
Journal
Scientific Reports
Author(s)
Ravache Andreas, Bourgeois Karen, Weimerskirch Henri, Pagenaud Angélique, de Grissac Sophie, Miller Mark, Dromzée Sylvain, Lorrain Anne, Allain Valérie, Bustamante Paco, Bylemans Jonas, Gleeson Dianne, Letourneur Yves, Vidal Éric
ISSN
2045-2322
Publication state
Published
Issued date
2020
Peer-reviewed
Oui
Volume
10
Number
1
Pages
15129
Language
english
Abstract
Two species breeding in sympatry are more likely to coexist if their ecological niches are segregated either in time, space or in trophic habits. Here, we combined GPS-tracking, stable isotope analysis and DNA metabarcoding analysis to understand how the rare Tahiti petrel Pseudobulweria rostrata (tp) copes with the very abundant (i.e. 500,000 breeding pairs) wedge-tailed shearwater Ardenna pacifica (WTS) when breeding in sympatry in a tropical area. WTS foraged in restricted areas along their path, while TP predominantly foraged using extensive search behavior, suggesting a more opportunistic foraging strategy. Interspecific overlap of foraging areas was higher than intraspecific overlap. Breeding seasons largely overlap between species during the study, but TP seems to be asynchronous breeders. TP fed upon prey with higher δ15N values than WTS, and their diet was mainly composed
of deep-sea organisms. TP could feed upon dead prey floating at the surface while WTS preyed
mainly upon fish species that generally move in schools. Our study highlights several segregating mechanisms (temporal, behavioral and trophic) that could facilitate the coexistence of the two species despite the predominant number of WTS, and provides the very first information on the foraging and trophic ecology of the poorly-known TP.
Pubmed
Open Access
Yes
Create date
16/09/2020 8:38
Last modification date
15/10/2020 5:23
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