Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Relationships between denning of polar bears and conditions of sea ice
Autore:
Ferguson, SH; Taylor, MK; Rosing-Asvid, A; Born, EW; Messier, F;
Indirizzi:
Govt NW Terr, Dept Resources Wildlife & Econ Dev, Iqaluit, NT X0A 0H0, Australia Govt NW Terr Iqaluit NT Australia X0A 0H0 Iqaluit, NT X0A 0H0, Australia Univ Saskatchewan, Dept Biol, Saskatoon, SK S7N 5E2, Canada Univ Saskatchewan Saskatoon SK Canada S7N 5E2 skatoon, SK S7N 5E2, Canada Greenland Inst Nat Resources, DK-3900 Nuuk, Greenland Greenland Inst Nat Resources Nuuk Greenland DK-3900 3900 Nuuk, Greenland
Titolo Testata:
JOURNAL OF MAMMALOGY
fascicolo: 4, volume: 81, anno: 2000,
pagine: 1118 - 1127
SICI:
0022-2372(200011)81:4<1118:RBDOPB>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
EASTERN BEAUFORT SEA; URSUS-MARITIMUS; FASTING ENDURANCE; SOUTHERN-OCEAN; LIFE-HISTORY; FREE PERIOD; SERUM UREA; HOME-RANGE; SEASONALITY; CREATININE;
Keywords:
annual ice; den use; dormancy; seasonality; sheltering; Ursus maritimus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Ferguson, SH Lakehead Univ, Fac Forestry & Forest Environm, 955 Oliver Rd,Thunder Bay,ON P7B 5E1, Canada Lakehead Univ 955 Oliver Rd Thunder Bay ON Canada P7B 5E1 ada
Citazione:
S.H. Ferguson et al., "Relationships between denning of polar bears and conditions of sea ice", J MAMMAL, 81(4), 2000, pp. 1118-1127

Abstract

We examined shelter and maternity dens used by 97 adult female polar bears(Ursus maritimus) in relation to conditions of sea ice. Obligate use of maternity dens for pregnancy, birth, and lactation varied little with latitude or area. In contrast, timing of facultative use of shelter dens switched from autumn in the southern area (<70<degrees>N) to winter in the northern area (>75 degreesN). For the southern area, 13 of 16 female polar bears used shelter dens in autumn versus winter (median dates of entry and exit, 11 September and 2 November; total = 56 days), whereas in the northern area, 11 of 17 bears used shelter dens in winter versus autumn (median dates, 24 December and 2 March; total = 65 days). Difference in facultative use of shelter dens was associated with conditions of sea ice, Southern regions had no sea ice when polar bears used shelter dens. In contrast, northern areas had more constant ice conditions that included presence of ice throughout the year. Southern regions seem to have greater primary productivity and moreseals as a result of a pronounced seasonal cycle of annual ice. Polar bears in northern areas responded to the more constant ice conditions and less productive environment with use of shelter dens during the period with lowest seal accessibility.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 06:17:23