Title
Seasonally persistent foraging niche segregation between sympatric Southern Rockhopper and Magellanic penguins breeding at Isla de lose Estados, Argentina
Author(s)
Rosciano, Natalia G.;Polito, Michael J.;Raya Rey, Andrea
Published
2020
Publisher
Journal of Ornithology
Abstract
δ 13 C values) while MP used coastal/benthic foraging habitats (higher δ 13 C values). In addition, SRP fed on lower trophic level prey (low δ 15 N values) relative to MP during both time periods. The isotopic foraging niches of MP highly overlapped between sexes at the population level and there was little to no evidence of niche segregation within breeding pairs or individual consistency in the seasonal foraging niche of both species. The results suggest that inter-specific foraging niche segregation is likely a more important factor influencing the trophic ecology and foraging behaviours of these species, relative to intra-specific factors. Even so, the persistence of inter-specific foraging niche segregation outside the breeding season suggests that either the potential for competition for food resource or foraging habitats remain high during this time or that the ultimate factors responsible for foraging niche segregation among these two species may be unrelated to these proximate factors.
Keywords
Spheniscus magellanicus;Eudyptes chrysocome;inter-specific competition;intra-specific competition;individual consistency
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PUB25230