REPRODUCTIVE AND DISPERSAL STRATEGIES OF MALE ARCTIC GROUND SQUIRRELS (SPERMOPHILUS PARRYII PLESIUS) (REPRODUCTION, YUKON, CANADA). PDF Download
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Author: Eileen Anne Lacey
Publisher:
ISBN:
Category : Arctic ground squirrel
Languages : en
Pages : 486
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first mate. I found that male reproductive behavior varied as a function of mating order and, hence, the likelihood of siring young. Specifically, reproductive competition among males appeared to be most intense prior to a female's first copulation.
Author: Eileen Anne Lacey
Publisher:
ISBN:
Category : Arctic ground squirrel
Languages : en
Pages : 486
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Book Description
first mate. I found that male reproductive behavior varied as a function of mating order and, hence, the likelihood of siring young. Specifically, reproductive competition among males appeared to be most intense prior to a female's first copulation.
Author: Timothy J. Karels
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Populations of arctic ground squirrels in the boreal forest of the southwest Yukon were studied in order to answer the following questions: (1) What are the mechanisms of population regulation in arctic ground squirrel populations, (2) How does variation among individuals and their environment influence their reproduction and survival, and (3) How does variation in habitat influence hibernating strategies of arctic ground squirrels? In spring 1996, control densities of ground squirrels were 1.6 per ha, and four other populations ranged in density from 3.2 to 30.1 per ha as a result of a 10-year (1987-96) large scale manipulation of food and predators in the boreal forest of the Kluane Boreal Forest Ecosystem Project. When the Kluane project terminated in spring 1996, I measured population densities, reproduction, emigration, and survival in all populations using live-trapping and radio-telemetry techniques until spring 1998. Arctic ground squirrel populations were strongly regulated because all experimental populations declined to control densities within two years after the termination of the experimental manipulations. Two factors proved strongly density-dependent and hence were regulatory: (1) the proportion of females that weaned their litter and (2) overwinter survival. Simultaneous density-independent changes in weaning rate were also detected and were attributed to changes in the previous year's snow accumulation. Female ground squirrels exhibited positive associations of life history traits. Squirrels in better condition at spring emergence were more likely to give birth, wean their litter, survive to the next breeding season, and reproduce once again. Nearly all females who failed during lactation did not survive to the next breeding season. The overwinter survival rate of females that successfully weaned a litter declined at a greater rate with increasing population density than did squirrels that never gave birth, indicating a cost to reproduction. Ground squirrels hibernated distantly (24 m) from their summer burrows in relation to population density and in open or shrubby habitats that were likely to accumulate the most snow. Increased snow accumulation over hibernacula increased the minimum soil temperatures and decreased the rate of mass loss of hibernating squirrels suggesting a selective mechanism for the ability of ground squirrels to identify habitats that minimize their energy expenditure during hibernation.
Author:
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Category :
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: 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.
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Author: Timothy J. (Timothy Jack) Karels
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612538856
Category :
Languages : en
Pages : 366
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Author: Ian G. McLean
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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The association of female kin in arctic ground squirrels (Spermophilus parryii) was studied near Haines Junction, Yukon Territory during the summers of 1977, 1978 and 1979.
Author: Diane E. Boellstorff
Publisher:
ISBN:
Category :
Languages : en
Pages : 224
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Author:
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ISBN:
Category : Electronic journals
Languages : en
Pages : 514
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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.
