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Titolo:
SPACE USE BY POLAR BEARS IN AND AROUND AUYUITTUQ NATIONAL-PARK, NORTHWEST-TERRITORIES, DURING THE ICE-FREE PERIOD
Autore:
FERGUSON SH; TAYLOR MK; MESSIER F;
Indirizzi:
UNIV SASKATCHEWAN,DEPT BIOL,112 SCI PL SASKATOON SK S7N 5E2 CANADA GOVT NW TERR,DEPT RESOURCES WILDLIFE & ECON DEV IQALUIT NT X0A 0H0 CANADA
Titolo Testata:
Canadian journal of zoology
fascicolo: 10, volume: 75, anno: 1997,
pagine: 1585 - 1594
SICI:
0008-4301(1997)75:10<1585:SUBPBI>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
WESTERN HUDSON-BAY; URSUS-MARITIMUS; ECOLOGY; FOOD; SEA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
S.H. Ferguson et al., "SPACE USE BY POLAR BEARS IN AND AROUND AUYUITTUQ NATIONAL-PARK, NORTHWEST-TERRITORIES, DURING THE ICE-FREE PERIOD", Canadian journal of zoology, 75(10), 1997, pp. 1585-1594

Abstract

We investigated patterns of space use by polar bears (Ursus maritimus) in and around Auyuittuq National Park, Northwest Territories, duringthe ice-free period in 1991-1995, using satellite telemetry and capture locations. Female polar bears showed general fidelity to the regionbut no site-specific fidelity. The pattern of sea-ice ablation influenced when and where bears were forced to leave the ice for land, usually at the end of August. While awaiting the return of sea ice, bears conserved energy by reducing movement and activity. Bears left the landafter ice formed that was strong enough to support them, usually in mid-November. During the ice-free period, females with cubs of the yearwere farther inland, closer to fjords, and less likely to use islandsthan were males. Males found close to females with cubs of the year were thinner than the average male, suggesting that segregation may result from the threat of intraspecific predation. Females with cubs of the year left the ice for land earlier than other classes of bears and rarely used snow shelters. After about 1 week on land, pregnant females entered a maternal den for the winter. Unlike those in other polar bear populations, most females with 1-year-olds entered a shelter afterabout 3 weeks on land and remained there for about 2 months. Dens andshelters were located at high elevations and far from the coast, and sheltering bears weighed more than nonsheltering bears.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 01:11:16