Zobrazeno 1 - 10
of 64
pro vyhledávání: '"A. T. Bergerud"'
The George River caribou herd increased from 15,000 animals in 1958 to 700,000 in 1988 - the largest herd in the world at the time. The authors trace the fluctuations in this caribou population back to the 1700s, detail how the herd escaped extinctio
Autor:
Rodger S. Ferguson, Heather Butler, William Dalton, Brian E. McLaren, Lo Camps, Arthur T. Bergerud
Publikováno v:
The Canadian Field-Naturalist. 134:342-352
Observations from 1974-2016 of Caribou (Rangifer tarandus) on the archipelago that comprises Slate Islands Provincial Park allowed us to infer direct and indirect effects of the arrival of Wolf (Canis lupus) pairs in winters of 1993-94 and 2003-04. W
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5eda800b0161eea85e4a7638f3e2dec0
https://doi.org/10.22621/cfn.v134i4.1964
https://doi.org/10.22621/cfn.v134i4.1964
Autor:
Arthur T. Bergerud
Publikováno v:
Rangifer, Vol 27, Iss 4 (2007)
The Southern Mountain and Boreal Woodland Caribou are facing extinction from increased predation, predominantly wolves (Canis lupus) and coyotes (Canis latrans). These predators are increasing as moose (Alces alces) and deer (Odocoileus spp). expand
Externí odkaz:
https://doaj.org/article/4df4da0859bd42fa952578c5d129e561
Publikováno v:
Rangifer, Vol 27, Iss 4 (2007)
Extended: The hypothesis was proposed that woodland caribou (Rangifer tarandus caribou) in North America had declined due to wolf predation and over-hunting rather than from a shortage of winter lichens (Bergerud, 1974). In 1974, two study areas were
Externí odkaz:
https://doaj.org/article/0acf2efaf2f4452e888df3674eada46d
Autor:
Arthur T. Bergerud, Stuart N. Luttich
Publikováno v:
Rangifer, Vol 23, Iss 5 (2003)
The behavior options of feeding animals lie on a continuum between energy maximization and minimization of predation risk. We studied the distribution, mobility, and energy budgets of the George River herd, Ungava from 1974 to 1993. We arranged the a
Externí odkaz:
https://doaj.org/article/b5e5f3e774a849f68a9afd568647383c
Publikováno v:
Écoscience. 21:374-386
Persistence for woodland caribou (Rangifer tarandus) in Pukaskwa National Park (PNP, Ontario, Canada; 1878 km2) was tied to females finding safe calving areas on offshore islands with a water barrier created by Lake Superior. During 1975–1988, PNP
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::af4b15d964e7c2e5af24041a61d275f9
https://doi.org/10.2980/21-(3-4)-3700
https://doi.org/10.2980/21-(3-4)-3700
Autor:
J P Elliott, A T Bergerud
Publikováno v:
Canadian Journal of Zoology. 76:1551-1569
Caribou (Rangifer tarandus), elk (Cervus canadensis), moose (Alces alces), and Stone's sheep (Ovis dalli stonei) were either decreasing or stable in numbers in two areas in northeastern British Columbia in 1981-1982, prior to reductions in wolf (Cani
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6526dc692dba1d2f379b025c956a902
https://doi.org/10.1139/z98-083
https://doi.org/10.1139/z98-083
Publikováno v:
Behaviour. 118:187-213
This study tested two hypotheses: that male-male competition and dominance relationships among males, rather than female choice of mates, principally determined the extreme variance in male mating success at sharp-tailed grouse leks; and, that male-m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a43c50f30fac63abcb7ea842439fd0f
https://doi.org/10.1163/156853991x00283
https://doi.org/10.1163/156853991x00283
Publikováno v:
Animal Behaviour. 39:360-368
Each spring from 1975 to 1985, a small herd of caribou, Rangifer tarandus , migrated in April to the islands in Lake Nipigon, Ontario where they remained for the summer. Three hypotheses for this migration were: (1) to reduce insect harassment, (2) t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9abb425d18d3ba5084b41f8c21fd59ad
https://doi.org/10.1016/s0003-3472(05)80882-6
https://doi.org/10.1016/s0003-3472(05)80882-6