Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Three decades (1983–2010) of contaminant trends in East Greenland polar bears (Ursus maritimus). Part 1: Legacy organochlorine contaminants
Abstract Legacy organochlorine contaminants were determined in adipose tissues from 294 polar bears (Ursus maritimus) sampled in East Greenland in 23 of the 28years between 1983 and 2010. Of 19 major legacy contaminants and congeners (ΣPCB, 4 PCB congeners (CB153, 180, 170/190), ΣDDT, p,p′-DDE, p,p′ -DDD and p,p′-DDT, α- and β-hexachlorocyclohexane (HCH), HCB, octachlorostyrene, dieldrin, oxychlordane, cis- and trans-chlordane, cis- and trans-nonachlor, heptachlor epoxide and BB-153), 18 showed statistically significant average yearly declines of −4.4% (range: −2.0 to −10.8%/year) among subadult polar bears (i.e. females<5years, males<6years). For example, the ∑PCB concentrations declined 2.7 fold from 22730ng/g lw (95% C.I.: 12470–32990ng/g lw) in 1983–1986 to 8473ng/g lw (95% C.I.: 6369–9776ng/g lw) in 2006–2010. Similar but fewer statistically significant trends were found for adult females and adult males likely due to smaller sample size and years. Despite declines as a result of international regulations, relatively high levels of these historic pollutants persist in East Greenland polar bear tissues.
Highlights ► Contaminant trends from 1983 to 2010 were reported for East Greenland polar bears. ► Legacy organochlorine contaminant levels decreased over the monitored period. ► Despite the effects of international regulations, high levels of pollutants persist in polar bear tissues.
Three decades (1983–2010) of contaminant trends in East Greenland polar bears (Ursus maritimus). Part 1: Legacy organochlorine contaminants
Abstract Legacy organochlorine contaminants were determined in adipose tissues from 294 polar bears (Ursus maritimus) sampled in East Greenland in 23 of the 28years between 1983 and 2010. Of 19 major legacy contaminants and congeners (ΣPCB, 4 PCB congeners (CB153, 180, 170/190), ΣDDT, p,p′-DDE, p,p′ -DDD and p,p′-DDT, α- and β-hexachlorocyclohexane (HCH), HCB, octachlorostyrene, dieldrin, oxychlordane, cis- and trans-chlordane, cis- and trans-nonachlor, heptachlor epoxide and BB-153), 18 showed statistically significant average yearly declines of −4.4% (range: −2.0 to −10.8%/year) among subadult polar bears (i.e. females<5years, males<6years). For example, the ∑PCB concentrations declined 2.7 fold from 22730ng/g lw (95% C.I.: 12470–32990ng/g lw) in 1983–1986 to 8473ng/g lw (95% C.I.: 6369–9776ng/g lw) in 2006–2010. Similar but fewer statistically significant trends were found for adult females and adult males likely due to smaller sample size and years. Despite declines as a result of international regulations, relatively high levels of these historic pollutants persist in East Greenland polar bear tissues.
Highlights ► Contaminant trends from 1983 to 2010 were reported for East Greenland polar bears. ► Legacy organochlorine contaminant levels decreased over the monitored period. ► Despite the effects of international regulations, high levels of pollutants persist in polar bear tissues.
Three decades (1983–2010) of contaminant trends in East Greenland polar bears (Ursus maritimus). Part 1: Legacy organochlorine contaminants
Dietz, Rune (Autor:in) / Rigét, Frank F. (Autor:in) / Sonne, Christian (Autor:in) / Born, Erik W. (Autor:in) / Bechshøft, Thea (Autor:in) / McKinney, Melissa A. (Autor:in) / Letcher, Robert J. (Autor:in)
Environmental International ; 59 ; 485-493
07.09.2012
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch