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Author: Ian Gordon McLean
Publisher:
ISBN:
Category : Arctic ground squirrel
Languages : en
Pages : 149
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Book Description
Doctoral thesis. Study of arctic ground squirrels near Haines Junction, Yukon, during the summers of 1977, 1978 and 1979. Includes four papers as appendices.
Author: Ian Gordon McLean
Publisher:
ISBN:
Category : Arctic ground squirrel
Languages : en
Pages : 149
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Book Description
Doctoral thesis. Study of arctic ground squirrels near Haines Junction, Yukon, during the summers of 1977, 1978 and 1979. Includes four papers as appendices.
Author: William G. Reeder
Publisher:
ISBN:
Category : Ground squirrels
Languages : en
Pages :
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Author: Vancouver Charles J. Krebs Professor of Zoology University of British Columbia
Publisher: Oxford University Press, USA
ISBN: 9780199771349
Category : Science
Languages : en
Pages : 542
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Book Description
The boreal forest is one of the world's great ecosystems, stretching across North America and Eurasia in an unbroken band and containing about 25% of the world's closed canopy forests. The Kluane Boreal Forest Ecosystem Project was a 10-year study by nine of Canada's leading ecologists to unravel the impact of the snowshoe hare cycle on the plants and the other vertebrate species in the boreal forest. In much of the boreal forest, the snowshoe hare acts as a keystone herbivore, fluctuating in 9-10 year cycles, and dragging along secondary cycles in predators such as lynx and great-horned owls. By manipulating the ecosystem on a large scale from the bottom via fertilizer additions and from the top by predator exclosures, they have traced the plant-herbivore relationships and the predator-prey relationships in this ecosystem to try to answer the question of what drives small mammal population cycles. This study is unique in being large scale and experimental on a relatively simple ecosystem, with the overall goal of defining what determines community structure in the boreal forest. Ecosystem Dynamics of the Boreal Forest: The Kluane Project summarizes these findings, weaving new discoveries of the role of herbivores-turned-predators, compensatory plant growth, and predators-eating-predators with an ecological story rich in details and clear in its findings of a community where predation plays a key role in determining the fate of individuals and populations. The study of the Kluane boreal forest raises key questions about the scale of conservation required for boreal forest communities and the many mammals and birds that live there.
Author:
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 418
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Author: Daniel I. Rubenstein
Publisher: Princeton University Press
ISBN: 1400858143
Category : Science
Languages : en
Pages : 564
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Seeking common principles of social evolution in different taxonomic groups, the contributors to this volume discuss eighteen groups of birds and mammals for which long-term field studies have been carried out. They examine how social organization is shaped by the interaction between proximate ecological pressures and culture"--the social traditions already in place and shaped by local and phylogenetic history. Originally published in 1987. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Author: Andrea Elizabeth Byrom
Publisher:
ISBN:
Category : Arctic ground squirrel
Languages : en
Pages : 412
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Food and predation were examined as factors limiting arctic ground squirrel (Spermophilus parryii plesius) populations during the decline and low phases of a snowshoe hare cycle (1992-1995). Food and predator limitation were tested experimentally with large-scale (36-ha) experimental manipulations: two food-supplemented areas, a predator exclosure, and a food-supplemented treatment where predators were also excluded. Predator removal doubled population density, while addition of food resulted in a four-fold density increase. Removal of predators and addition of food together resulted in a 10-fold increase in arctic ground squirrel population densities. Population densities and adult survival rates were lower in 1992 and 1993 (two years after the snowshoe hare population decline) than in 1994 and 1995. Food supply and predation interact to limit arctic ground squirrel population densities in the boreal forest during the decline and low phases of the snowshoe hare cycle. Supplemental food did not affect dispersal distances or dispersal frequency of 172 radio-collared juveniles of either sex in any year. Juveniles that moved farther from their natal burrow were more likely to die. Males moved farther than females and died more frequently. Dispersal tendency was unrelated to population density in males. Females increased their tendency to disperse only on a study site with population densities 17 times those of control populations. Male arctic ground squirrels probably disperse to avoid inbreeding, while females may disperse in response to resource limitation at very high densities. Philopatric females had higher fitness than females that dispersed, particularly if survival during dispersal was taken into account. As population density increased from 1992 to 1995, home range overlap of adult females also increased, as daughters survived to reproductive age in contact with their mother's home range. A stage-based simulation model of the annual cycle of activity and hibernation was strongly sensitive to female survival.
Author: Charles Loren Buck
Publisher:
ISBN:
Category : Arctic ground squirrel
Languages : en
Pages : 298
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Author:
Publisher:
ISBN:
Category : Wildlife conservation
Languages : en
Pages : 84
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Author: Mark R. Simpson
Publisher:
ISBN:
Category : Arctic ground squirrel
Languages : en
Pages : 436
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Book Description
Field work was conducted 7 km. northwest of the town of Rankin Inlet, Northwest Territories (now in Nunavut) during the summers of 1989 to 1991.
Author:
Publisher:
ISBN:
Category : Animals
Languages : en
Pages : 404
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Book Description
