Publications des scientifiques de l'IRD

Ravache A., Bourgeois K., Weimerskirch H., Pagenaud A., de Grissac S., Miller M., Dromzee S., Lorrain Anne, Allain V., Bustamante P., Bylemans J., Gleeson D., Letourneur Y., Vidal Eric. (2020). Behavioral and trophic segregations help the Tahiti petrel to cope with the abundance of wedge-tailed shearwater when foraging in oligotrophic tropical waters. Scientific Reports - Nature, 10 (1), p. 15129 [18 p.]. ISSN 2045-2322.

Titre du document
Behavioral and trophic segregations help the Tahiti petrel to cope with the abundance of wedge-tailed shearwater when foraging in oligotrophic tropical waters
Année de publication
2020
Type de document
Article référencé dans le Web of Science WOS:000573754900005
Auteurs
Ravache A., Bourgeois K., Weimerskirch H., Pagenaud A., de Grissac S., Miller M., Dromzee S., Lorrain Anne, Allain V., Bustamante P., Bylemans J., Gleeson D., Letourneur Y., Vidal Eric
Source
Scientific Reports - Nature, 2020, 10 (1), p. 15129 [18 p.] ISSN 2045-2322
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 delta N-15 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.
Plan de classement
Limnologie biologique / Océanographie biologique [034]
Description Géographique
PACIFIQUE SUD OUEST ; NOUVELLE CALEDONIE ; MATO ILE ; CANARD ILE ; NEMOU ILE
Localisation
Fonds IRD [F B010079788]
Identifiant IRD
fdi:010079788
Contact