期刊
ENVIRONMENTAL POLLUTION
卷 142, 期 1, 页码 83-92出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2005.09.019
关键词
chlorinated hydrocarbons; organochlorines; pesticides; polychlorinated biphenyls; Zalophus californianus californianus; Baja California
Chlorinated hydrocarbons (CHs) were determined in blubber samples of 18 California sea lions (Zalophus californianus californianus) that stranded dead along Todos Santos Bay, Ensenada, Baja California, Mexico, January 2000-November 2001. Sigma DDTs were the dominant group (geometric mean 3.8 mu g/g lipid weight), followed by polychlorinated biphenyls (Sigma PCBs, 2.96 mu g/g), chlordanes (0.12 mu g/g) and hexachlorocy-clohexanes (0.06 mu g/g). The Sigma DDTs/Sigma PCBs ratio was 1.3. We found CH levels more than one order of magnitude lower than those reported for California sea lion samples collected along the California coast, USA, during the same period as our study. This sharp north-south gradient suggests that Z. californianus stranded in Ensenada (most of them males) would probably have foraged during the summer near rookeries 5001000 km south of Ensenada and the rest of the year migrate northwards, foraging along the Baja California peninsula, including Ensenada, and probably farther north. (c) 2005 Elsevier Ltd. All rights reserved.
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