Mercury in gray wolves (Canis lupus) in Alaska: increased exposure through consumption of marine prey.
Mercury (Hg) bioaccumulates in the tissues of organisms and biomagnifies within food-webs. Gray wolves (Canis lupus) in Alaska primarily acquire Hg through diet; therefore, comparing the extent of Hg exposure in wolves, in conjunction with stable isotopes, from interior and coastal regions of Alaska offers important insight into their feeding ecology. Liver, kidney, and skeletal muscle samples from 162 gray wolves were analyzed for total mercury (THg) concentrations and stable isotopic signatures (δ(13)C, δ(15)N, and δ(34)S). Median hepatic THg concentrations were significantly higher in wolves with coastal access compared to wolves from interior Alaska. Stable isotope ratios, in conjunction with THg concentrations, provide strong evidence that coastal wolves are utilizing marine prey representing several trophic levels. The utilization of cross-ecosystem food resources by coastal wolves is clearly contributing to increased THg exposure, and may ultimately have negative health implications for these animals.
Department of Microbiology, Immunology, and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1619, USA. Electronic address: ashley.mcgrew@colostate.edu.
Ashley K
AK
McGrew
Lora R
LR
Ballweber
Sara K
SK
Moses
Craig A
CA
Stricker
Kimberlee B
KB
Beckmen
Mo D
MD
Salman
Todd M
TM
O'Hara
D000413:Alaska; D000818:Animals; D002247:Carbon Isotopes / Q000378:metabolism; D004032:Diet; D004781:Environmental Exposure / Q000032:analysis*; D020387:Food Chain; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D013058:Mass Spectrometry; D008628:Mercury / Q000032:analysis / Q000493:pharmacokinetics*; D018482:Muscle, Skeletal / Q000378:metabolism; D009587:Nitrogen Isotopes / Q000378:metabolism; D018709:Statistics, Nonparametric; D013460:Sulfur Isotopes / Q000378:metabolism; D019596:Wolves / Q000378:metabolism*
D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D013460:Sulfur Isotopes; D008628:Mercury
Bioaccumulation; Biomagnification; Canis lupus; Feeding ecology; Mercury; Stable isotopes