Oecologia 1999 Jun;119(4):578-585
Department of Earth Sciences, University of California, Santa Cruz, Earth and Marine Sciences Building, Santa Cruz, CA 95064, USA e-mail: Tel.: +1-831-4594089, , , , , , US.
We investigated the impact of foraging location (nearshore vs offshore) and foraging latitude (high vs middle) on the carbon (δC) and nitrogen (δN) isotope compositions of bone collagen of northern fur seals (Callorhinus ursinus), harbor seals (Phoca vitulina), California sea lions (Zalophus californianus), and northern elephant seals (Mirounga angustirostris). Nearshore-foraging harbor seals from California had δC values 2.0‰ higher than female northern elephant seals foraging offshore at similar latitudes. Read More