Consulta: creatorFacets:"Bourgeois, Karen"
Registros recuperados: 2
Data/hora: 11/06/2024 06:27:30

Flying to the moon: Lunar cycle influences trip duration and nocturnal foraging behavior of the wedge-tailed shearwater Ardenna pacifica
Provedor de dados: 5
Autores: Ravache, Andreas; Bourgeois, Karen; Thibault, Martin; Dromzée, Sylvain; Weimerskirch, Henri; De Grissac, Sophie; Prudor, Aurélien; Lorrain, Anne; Menkes, Christophe; Allain, Valerie; Bustamante, Paco; Letourneur, Yves; Vidal, Eric.
Lunar phase and illumination are known to affect nocturnal behavior of many organisms, particularly through predator-prey interactions. Visual predators can benefit from higher light levels to increase their activity, while prey may decrease their activity to avoid predation. The lower number of nocturnal seabirds observed on colonies during full moon nights has been mostly interpreted as a predation avoidance strategy. However, it is also possible that shearwaters take advantage of the moon's illumination to feed also at night, and stay at sea to forage during full moon nights. We used miniaturized GPS-loggers to obtain 179 tracks from 99 wedge-tailed shearwaters breeding in New Caledonia, to investigate moonlight effects on individual behavior. Lunar...
Tipo: Text
Palavras-chave: Ardenna pacifica; Foraging; Lunar phase; Moon; GPS-tracking; Stable isotope analyses.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00607/71880/70608.pdf

Behavioral and trophic segregations help the Tahiti petrel to cope with the abundance of wedge-tailed shearwater when foraging in oligotrophic tropical waters
Provedor de dados: 5
Autores: Ravache, Andreas; Bourgeois, Karen; Weimerskirch, Henri; Pagenaud, Angélique; De Grissac, Sophie; Miller, Mark; Dromzée, Sylvain; Lorrain, Anne; Allain, Valerie; Bustamante, Paco; Bylemans, Jonas; Gleeson, Dianne; Letourneur, Yves; Vidal, Eric.
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,...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00651/76287/77262.pdf