Total mercury body burden in Pacific harbor seal, Phoca vitulina richardii, pups from central California |
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Authors: | Brookens Tiffini J O'Hara Todd M Taylor Robert J Bratton Gerald R Harvey James T |
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Institution: | Moss Landing Marine Laboratories, Moss Landing, CA 95039, USA. tjbrooken@aol.com |
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Abstract: | To determine body and tissue compartment-specific burdens (mg) of total mercury (THg), tissues were weighed and analyzed for THg concentration (microg/g fw) in Pacific harbor seal (Phoca vitulina richardii) pups from central California in 2006. THg concentrations were related as follows: hair > liver = kidney = pelt > muscle > other = heart > brain > blubber > bone. THg burden, however, was related as: pelt = muscle > liver = other > kidney = blubber > brain = heart > bone. THg concentration and burden in muscle were strongly associated with delta(15)N. delta(13)C and delta(15)N values were significantly greater in muscle than liver, and delta(13)C was significantly lesser the longer animals were in rehabilitation. Because THg concentration and burden in muscle correlated most significantly with other tissue compartments, we recommend that muscle from the specific sites we sampled be used instead of liver or hair for biomonitoring THg in harbor seals. Assessment of proportional THg burdens within each tissue compartment for harbor seals pups included use of a conceptual model, allowing for more complete visual characterization of THg body burden. |
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Keywords: | Body burden Mercury Harbor seal Stable isotopes Conceptual model |
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