Red Squirrel (Tamiasciurus Hudsonicus) Ecology During Spruce Cone Failure in Alaska PDF Download
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Author: Michael C. T. Smith Publisher: 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).
Author: Michael C. T. Smith Publisher: 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).
Author: Paul Vincent Krasnowski Publisher: 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.
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.) Publisher: ISBN: Category : Forests and forestry Languages : en Pages : 376
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.) Publisher: ISBN: Category : Forests and forestry Languages : en Pages : 410
Author: H. Reed Sanderson Publisher: University of Arizona Press ISBN: 9780816527687 Category : Science Languages : en Pages : 446
Book Description
Papers from a symposium on the endangered Mt. Graham red squirrel, called in response to the building of an observatory on the mountain by the University of Arizona, offers a comprehensive picture of the ecological conditions and the impacts of natural and man-mad changes on the squirrel and its mountain home.
Author: Michael C. T. Smith
Author: Michael C. T. Smith
Author: Paul Vincent Krasnowski
Author: John C. Zasada
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Author: John C. Zasada
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Author: Andrea Pesce
Author: H. Reed Sanderson
Author: Jerry O. Wolff
Author: Charles N. Mann