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Titolo:
Delineating Canadian and Greenland polar bear (Ursus maritimus) populations by cluster analysis of movements
Autore:
Taylor, MK; Akeeagok, S; Andriashek, D; Barbour, W; Born, EW; Calvert, W; Cluff, HD; Ferguson, S; Laake, J; Rosing-Asvid, A; Stirling, I; Messier, F;
Indirizzi:
Govt Nunavut, Dept Sustainable Dev, Iqaluit, NT X0A 0H0, Canada Govt Nunavut Iqaluit NT Canada X0A 0H0 e Dev, Iqaluit, NT X0A 0H0, Canada Govt Nunavut, Dept Sustainable Dev, Grise Fiord, NT X0H 0H0, Canada Govt Nunavut Grise Fiord NT Canada X0H 0H0 rise Fiord, NT X0H 0H0, Canada Canadian Wildlife Serv, Edmonton, AB T6H 3S5, Canada Canadian Wildlife Serv Edmonton AB Canada T6H 3S5 ton, AB T6H 3S5, Canada Labrador Inuit Assoc, Nain, NF A0P 1L0, Canada Labrador Inuit Assoc Nain NF Canada A0P 1L0 soc, Nain, NF A0P 1L0, Canada Greenland Inst Nat Resources, DK-3900 Nuuk, Greenland Greenland Inst Nat Resources Nuuk Greenland DK-3900 3900 Nuuk, Greenland Govt NW Terr, Dept Resources Wildlife & Econ Dev, Yellowknife, NT X1A 2P9,Canada Govt NW Terr Yellowknife NT Canada X1A 2P9 Yellowknife, NT X1A 2P9,Canada Univ Saskatchewan, Dept Biol, Saskatoon, SK S7N 5E2, Canada Univ Saskatchewan Saskatoon SK Canada S7N 5E2 skatoon, SK S7N 5E2, Canada Natl Marine Fisheries Serv, Natl Marine Mammal Lab, Alaska Fisheries Sci Ctr, Seattle, WA 98115 USA Natl Marine Fisheries Serv Seattle WA USA 98115 tr, Seattle, WA 98115 USA
Titolo Testata:
CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE
fascicolo: 4, volume: 79, anno: 2001,
pagine: 690 - 709
SICI:
0008-4301(200104)79:4<690:DCAGPB>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEALS PHOCA-HISPIDA; NORTHWEST-TERRITORIES; ICE; ABUNDANCE; DYNAMICS; PATTERNS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
70
Recensione:
Indirizzi per estratti:
Indirizzo: Taylor, MK Govt Nunavut, Dept Sustainable Dev, POB 1000,Stn 1170, Iqaluit,NT X0A 0H0, Canada Govt Nunavut POB 1000,Stn 1170 Iqaluit NT Canada X0A 0H0 Canada
Citazione:
M.K. Taylor et al., "Delineating Canadian and Greenland polar bear (Ursus maritimus) populations by cluster analysis of movements", CAN J ZOOL, 79(4), 2001, pp. 690-709

Abstract

Within their circumpolar range, polar bears (Ursus maritimus) are not subject to absolute barriers. However, physiographic features do cause discontinuities in their movements. These discontinuities in distribution can be used to delineate population units. Based on satellite telemetry of the movements of female polar bears carried out in 1989-1998, we used cluster analysis to identify 6 regions within the Canadian and western Greenland Arctic in which movements appear to be restricted enough to identify distinct populations. These regions generally correspond to management units that have been previously identified as Viscount Melville Sound, Lancaster Sound, Norwegian Bay, Kane Basin, Baffin Bay, and Davis Strait. A north-south substructure was identified for the Baffin Bay population, but it was weaker than the structure identified for the 6 primary units. The 6 units were consistentwith genetic information, except for the Baffin Bay - Kane Basin separation, and with mark-recapture observations and the traditional knowledge of Inuit hunters. Only 2 of 65 bears that provided telemetry information for more than 1 year were classified in different populations in different years. However, annual rates of exchange, measured as the percentage of locations outside the population boundary, ranged from 0.4 to 8.9%. Analysis of mark-recapture movements indicated no difference in large-scale movements between the sexes or long-term movements with age. Although our validation criteria for demographic closure were satisfied, the observed rates of exchange between adjacent populations suggest that population dynamics in adjacent populations may not be completely independent.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 21:52:21