![]() Seabird colonies have become a focus of international conservation due to the increasing interaction with fisheries, high mortality rates related to anthropogenic activity and vulnerability to climate change (Thompson 1989 Barton 2002 Hilton et al. Seabirds on New Island had a range of 1.3 TLs, which is on the upper end of ranges within a community (0.4–1.5), indicating strong trophic structuring. The mean TL (3.7) of the seabird community on New Island was at the lower end of the mean value range (3.5–4.5), but not significantly different, from the reviewed seabird communities. We further reviewed conventional and stable isotope seabird community studies calculating the means and ranges of TLs observed across these studies. The stable isotope ratios indicated differences in feeding areas and TLs between species, consistent with the data of previous conventional diet analyses and observations at sea. We included adult feathers representing the interbreeding season, as well as chick feathers or down representing the breeding season. We here present data on nitrogen and carbon isotope ratios of eight species of seabirds from New Island, Falkland Islands, and compare trophic levels (TL) and foraging distributions. Seabird colonies provide rare opportunities to study trophic segregation in an entire bird community. ![]()
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