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Mercury trends in ringed seals (Phoca hispida) from the western Canadian Arctic since 1973: associations with length of ice-free season.
Environ Sci Technol. 2009 May 15; 43(10):3646-51.ES

Abstract

We examined a unique time series of ringed seal (Phoca hispida) samples collected from a single location in the western Canadian Arctic between 1973 and 2007 to test for changes in total mercury (THg) in muscle tissue associated with (1) year and (2) length of ice-free season. We found no temporal trend with muscle THg whereas a curvilinear relationship existed with the length of ice-free season: seals attaimed higher THg in short (2 months) and long (5 months) ice-free seasons. delta 15N and delta13C in muscle tissue did not illustrate significant trends with ice-free days. We estimated that the turnover time of THg in muscle was about twice as long as stable isotope turnover in muscle, possibly explaining the lack of trend with stable isotopes in association with ice-free duration. Our discussion explains how summer environmental conditions may influence the composition of prey (mercury exposure) available to ringed seals. Results offer insight into how marine mammals may respond to directional changes in the Arctic ice-free season.

Authors+Show Affiliations

Department of Environment and Geography, University of Manitoba, 500 University Crescent, Winnipeg MB, R3T 2N2, Canada.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19544867

Citation

Gaden, A, et al. "Mercury Trends in Ringed Seals (Phoca Hispida) From the Western Canadian Arctic Since 1973: Associations With Length of Ice-free Season." Environmental Science & Technology, vol. 43, no. 10, 2009, pp. 3646-51.
Gaden A, Ferguson SH, Harwood L, et al. Mercury trends in ringed seals (Phoca hispida) from the western Canadian Arctic since 1973: associations with length of ice-free season. Environ Sci Technol. 2009;43(10):3646-51.
Gaden, A., Ferguson, S. H., Harwood, L., Melling, H., & Stern, G. A. (2009). Mercury trends in ringed seals (Phoca hispida) from the western Canadian Arctic since 1973: associations with length of ice-free season. Environmental Science & Technology, 43(10), 3646-51.
Gaden A, et al. Mercury Trends in Ringed Seals (Phoca Hispida) From the Western Canadian Arctic Since 1973: Associations With Length of Ice-free Season. Environ Sci Technol. 2009 May 15;43(10):3646-51. PubMed PMID: 19544867.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mercury trends in ringed seals (Phoca hispida) from the western Canadian Arctic since 1973: associations with length of ice-free season. AU - Gaden,A, AU - Ferguson,S H, AU - Harwood,L, AU - Melling,H, AU - Stern,G A, PY - 2009/6/24/entrez PY - 2009/6/24/pubmed PY - 2009/7/21/medline SP - 3646 EP - 51 JF - Environmental science & technology JO - Environ Sci Technol VL - 43 IS - 10 N2 - We examined a unique time series of ringed seal (Phoca hispida) samples collected from a single location in the western Canadian Arctic between 1973 and 2007 to test for changes in total mercury (THg) in muscle tissue associated with (1) year and (2) length of ice-free season. We found no temporal trend with muscle THg whereas a curvilinear relationship existed with the length of ice-free season: seals attaimed higher THg in short (2 months) and long (5 months) ice-free seasons. delta 15N and delta13C in muscle tissue did not illustrate significant trends with ice-free days. We estimated that the turnover time of THg in muscle was about twice as long as stable isotope turnover in muscle, possibly explaining the lack of trend with stable isotopes in association with ice-free duration. Our discussion explains how summer environmental conditions may influence the composition of prey (mercury exposure) available to ringed seals. Results offer insight into how marine mammals may respond to directional changes in the Arctic ice-free season. SN - 0013-936X UR - https://www.unboundmedicine.com/medline/citation/19544867/Mercury_trends_in_ringed_seals__Phoca_hispida__from_the_western_Canadian_Arctic_since_1973:_associations_with_length_of_ice_free_season_ L2 - https://doi.org/10.1021/es803293z DB - PRIME DP - Unbound Medicine ER -