USING CARBON AND NITROGEN ISOTOPE VALUES TO INVESTIGATE MATERNAL STRATEGIES IN NORTHEAST PACIFIC OTARIIDS

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Using stable isotope biogeochemistry to study marine mammal ecology (2010, background): “Mother-to-offspring transfer of nutrients during pregnancy and nursing has been the focus of several recent isotopic studies (Jenkins et al. 2001, Polischuck et al. 2001, Newsome et al. 2006, Stegall et al. 2008, York et al. 2008).”
Retrospective characterization of ontogenetic shifts in killer whale diets via δ 13 C and δ 15 N analysis of teeth (2009, background): “We assume that acid etching did not influence δ13C and δ15N values because the surface portion of the tooth represents only a small fraction of the total sample (Hobson & Sease 1998, Newsome et al. 2006).”
Age, body mass and environmental variation shape the foraging ontogeny of Galapagos sea lions (2012, background): “However, 18M and 24M juvenile δ15N values did not differ from those of adult females in our study, which is similar to what has been found in California sea lions Zalophus californianus (Newsome et al. 2006).”