Author: Gary F. SearingPublisher:
ISBN:
Category : Aggressive behavior in animals
Languages : en
Pages : 198
Book Description
Aggressive Behavior and Population Regulation of Red Squirrels (Tamiasciurus Hudsonicus) in Interior Alaska
Author: Gary F. SearingPublisher:
ISBN:
Category : Aggressive behavior in animals
Languages : en
Pages : 198
Book Description
Aspects of Red Squirrel (Tamiasciurus Hudsonicus) Population Ecology in Interior Alaska
Author: Paul Vincent KrasnowskiPublisher:
ISBN:
Category : Rodent populations
Languages : en
Pages : 84
Book Description
Red squirrel (Tamiasciurus hudsonicus preblei) population ecology was investigated in a field study conducted between 21 September 1967 and 30 October 1968 near College, Alaska. Population density on the 21 ha study area was one squirrel per 1.1 ha during the spring 1968 and one per 1.2 ha during the fall 1968. Territoriality appears to be somewhat relaxed during the spring, and there are non-territorial squirrels present at that time. Young of the year squirrels can be distinguished from adults, at least through October, according to the degree of closure of the epiphyses of the radius and ulna. Immature males can be distinguished from adults on the basis of testis weight during the fall. Immature squirrels constituted 57.1% of the population sample during the fall 1967 and 51.3% during the fall 1968. Males formed 66.7% of the sample of adults and 64.0% of the sample of immature squirrels. Males were not significantly heavier or larger than females. Mean tail length of immature squirrels exceeded that of adults. Fall molt commences for all red squirrels during late August and September. The spring molt commences for females during March, whereas males do not molt until May. Testes measurements and female reproductive condition indicate that there is a single annual reproductive season, from late February through April. Squirrels breed during their first spring at about 10 to 11 months of age. Estimated mean litter size was 4.20 based on embryo counts and 3.92 based on placental scars. The most frequent litter size was four.
Red Squirrel Response to Clearcut and Shelterwood Systems in Interior Alaska
Author: Jerry O. WolffPublisher:
ISBN:
Category : Clearcutting
Languages : en
Pages : 8
Book Description
U.S.D.A. Forest Service Research Note PNW.
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 362
Book Description
Mammal Community Dynamics
Author: Cynthia J. ZabelPublisher: Cambridge University Press
ISBN: 9780521008655
Category : Nature
Languages : en
Pages : 740
Book Description
Table of contents
Cooperative Research Units, Fishery and Wildlife, Annual Report
Author: U.S. Fish and Wildlife Service. Division of Cooperative ResearchPublisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 260
Book Description
Canadian Journal of Zoology
Author: Cooperative Research Units, Fishery and Wildife, Annual Report
Author: U. S. Fish and Wildlife Service. Division of Cooperative ResearchPublisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 272
Book Description
Phellinus (Poria) Weirii Root Rot in Douglas-fir-alder Stands 10-17 Years Old
Author: Everett M. HansenPublisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 294
Book Description
Red Squirrel (Tamiasciurus Hudsonicus) Ecology During Spruce Cone Failure in Alaska
Author: Michael C. T. SmithPublisher:
ISBN:
Category : Cones (Botany)
Languages : en
Pages : 136
Book Description
Observations were made on a red squirrel population in a mature white spruce (Picea glauca) forest in the Bonanza Creek Experimental Forest (southwest of Fairbanks, Alaska) during two years of spruce cone crop failure (July 1964 and April 1966).