| Literature DB >> 17931664 |
Margaret M Krahn1, M Bradley Hanson, Robin W Baird, Richard H Boyer, Douglas G Burrows, Candice K Emmons, John K B Ford, Linda L Jones, Dawn P Noren, Peter S Ross, Gregory S Schorr, Tracy K Collier.
Abstract
"Southern Resident" killer whales include three "pods" (J, K and L) that reside primarily in Puget Sound/Georgia Basin during the spring, summer and fall. This population was listed as "endangered" in the US and Canada following a 20% decline between 1996 and 2001. The current study, using blubber/epidermis biopsy samples, contributes contemporary information about potential factors (i.e., levels of pollutants or changes in diet) that could adversely affect Southern Residents. Carbon and nitrogen stable isotopes indicated J- and L-pod consumed prey from similar trophic levels in 2004/2006 and also showed no evidence for a large shift in the trophic level of prey consumed by L-pod between 1996 and 2004/2006. Sigma PCBs decreased for Southern Residents biopsied in 2004/2006 compared to 1993-1995. Surprisingly, however, a three-year-old male whale (J39) had the highest concentrations of Sigma PBDEs, Sigma HCHs and HCB. POP ratio differences between J- and L-pod suggested that they occupy different ranges in winter.Entities:
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Year: 2007 PMID： 17931664 DOI： 10.1016/j.marpolbul.2007.08.015
Source DB: PubMed Journal: Mar Pollut Bull ISSN： 0025-326X Impact factor: 5.553