DOI: 10.1111/gcb.12241
论文题名: Global change effects on the long-term feeding ecology and contaminant exposures of East Greenland polar bears
作者: Mckinney M.A. ; Iverson S.J. ; Fisk A.T. ; Sonne C. ; Rigét F.F. ; Letcher R.J. ; Arts M.T. ; Born E.W. ; Rosing-Asvid A. ; Dietz R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 8 起始页码: 2360
结束页码: 2372
语种: 英语
英文关键词: Contaminants
; Diet
; Fatty acid carbon isotopes
; Fatty acids
; Polar bear
; Sea ice
; Temporal trends
Scopus关键词: carbon
; fatty acid
; carbon isotope
; carnivore
; diet
; fatty acid
; feeding ecology
; global change
; mammal
; North Atlantic Oscillation
; pinniped
; pollutant
; relative abundance
; sea ice
; sea surface temperature
; trophic level
; adipose tissue
; animal
; article
; bear
; climate change
; contaminants
; diet
; fatty acid carbon isotopes
; feeding behavior
; female
; gas chromatography
; Greenland
; male
; mass fragmentography
; metabolism
; physiology
; polar bear
; pollutant
; sea ice
; seal
; season
; temporal trends
; whale
; contaminants
; diet
; fatty acid carbon isotopes
; fatty acids
; polar bear
; sea ice
; temporal trends
; Adipose Tissue
; Animals
; Carbon
; Carbon Isotopes
; Climate Change
; Environmental Pollutants
; Fatty Acids
; Feeding Behavior
; Female
; Flame Ionization
; Gas Chromatography-Mass Spectrometry
; Greenland
; Male
; Pinnipedia
; Seasons
; Ursidae
; Whales
; Arctic
; East Greenland
; Greenland
; Cystophora (Mammalia)
; Erignathus
; Mammalia
; Monodon
; Odobenidae
; Phoca groenlandica
; Phoca hispida
; Ursus maritimus
英文摘要: Rapid climate changes are occurring in the Arctic, with substantial repercussions for arctic ecosystems. It is challenging to assess ecosystem changes in remote polar environments, but one successful approach has entailed monitoring the diets of upper trophic level consumers. Quantitative fatty acid signature analysis (QFASA) and fatty acid carbon isotope (δ13C-FA) patterns were used to assess diets of East Greenland (EG) polar bears (Ursus maritimus) (n = 310) over the past three decades. QFASA-generated diet estimates indicated that, on average, EG bears mainly consumed arctic ringed seals (47.5 ± 2.1%), migratory subarctic harp (30.6 ± 1.5%) and hooded (16.7 ± 1.3%) seals and rarely, if ever, consumed bearded seals, narwhals or walruses. Ringed seal consumption declined by 14%/decade over 28 years (90.1 ± 2.5% in 1984 to 33.9 ± 11.1% in 2011). Hooded seal consumption increased by 9.5%/decade (0.0 ± 0.0% in 1984 to 25.9 ± 9.1% in 2011). This increase may include harp seal, since hooded and harp seal FA signatures were not as well differentiated relative to other prey species. Declining δ13C-FA ratios supported shifts from more nearshore/benthic/ice-associated prey to more offshore/pelagic/open-water-associated prey, consistent with diet estimates. Increased hooded seal and decreased ringed seal consumption occurred during years when the North Atlantic Oscillation (NAO) was lower. Thus, periods with warmer temperatures and less sea ice were associated with more subarctic and less arctic seal species consumption. These changes in the relative abundance, accessibility, or distribution of arctic and subarctic marine mammals may have health consequences for EG polar bears. For example, the diet change resulted in consistently slower temporal declines in adipose levels of legacy persistent organic pollutants, as the subarctic seals have higher contaminant burdens than arctic seals. Overall, considerable changes are occurring in the EG marine ecosystem, with consequences for contaminant dynamics. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62383
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada; Great Lakes Institute for Environmental Research, University of Windsor, Windsor, ON N9B 3P4, Canada; Department of Biological Sciences, Arctic Research Centre, Aarhus University, Roskilde DK-4000, Denmark; Ecotoxicology and Wildlife Health Division, Science and Technology Branch, Environment Canada, National Wildlife Research Centre, Carleton University, Ottawa, ON K1A 0H3, Canada; Environment Canada, National Water Research Institute, Burlington, ON L7R 4A6, Canada; Greenland Institute of Natural Resources, P.O. Box 570, Nuuk DK-3900, Greenland
Recommended Citation:
Mckinney M.A.,Iverson S.J.,Fisk A.T.,et al. Global change effects on the long-term feeding ecology and contaminant exposures of East Greenland polar bears[J]. Global Change Biology,2013-01-01,19(8)