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.
Aspects of Red Squirrel (Tamiasciurus Hudsonicus) Population Ecology in Interior Alaska
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.
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.
Aspects of the Reproductive Biology of the Red Squirrel
Author: Marilyn M. Modafferi
Publisher:
ISBN:
Category : Reproduction
Languages : en
Pages : 164
Book Description
Publisher:
ISBN:
Category : Reproduction
Languages : en
Pages : 164
Book Description
Red Squirrel (Tamiasciurus Hudsonicus) Ecology During Spruce Cone Failure in Alaska
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).
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).
Red Squirrel Response to Clearcut and Shelterwood Systems in Interior Alaska
Author: Jerry O. Wolff
Publisher:
ISBN:
Category : Clearcutting
Languages : en
Pages : 8
Book Description
Publisher:
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
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 362
Book Description
Aggressive Behavior and Population Regulation of Red Squirrels (Tamiasciurus Hudsonicus) in Interior Alaska
Author: Gary F. Searing
Publisher:
ISBN:
Category : Aggressive behavior in animals
Languages : en
Pages : 198
Book Description
Publisher:
ISBN:
Category : Aggressive behavior in animals
Languages : en
Pages : 198
Book Description
Sustainable Squirrel Conservation
Author: Moriz Steiner
Publisher: Springer Nature
ISBN: 3031235479
Category : Science
Languages : en
Pages : 380
Book Description
This book attempts to move the family of squirrels (Sciuridae) out of the shadow of large charismatic mammals and to highlight management failures with the goal of moving towards an improved conservation approach. Particular attention is paid to the influence of taxonomic science on squirrel conservation. In addition, the authors show how human-driven climate change, global change and modern politics are shaping global squirrel populations as well as their surrounding environments and ecosystems. Squirrels are widespread around the globe, naturally occurring on every continent except Antarctica and Oceania, and they are certainly among the animals most commonly encountered in everyday life. Despite this, the authors of this volume identify worrying gaps in squirrel conservation. Squirrels are often hunted, trapped, poached, and stressed, and management strategies and legislation are often devised in the absence of proper knowledge of issues such as population sizes, taxonomies, and trends. Together, this can result in severe population declines and even species extinction. By assessing their taxonomic situation, ecology, the evolution and divergence of Sciuridae around the globe, and squirrels’ well-being across habitats, the authors set a baseline from which to launch future investigations into the conservation of squirrels and other species. Additionally, the authors highlight the influences of climate change, unsustainable growth, and various man-made threats to the future of this family.
Publisher: Springer Nature
ISBN: 3031235479
Category : Science
Languages : en
Pages : 380
Book Description
This book attempts to move the family of squirrels (Sciuridae) out of the shadow of large charismatic mammals and to highlight management failures with the goal of moving towards an improved conservation approach. Particular attention is paid to the influence of taxonomic science on squirrel conservation. In addition, the authors show how human-driven climate change, global change and modern politics are shaping global squirrel populations as well as their surrounding environments and ecosystems. Squirrels are widespread around the globe, naturally occurring on every continent except Antarctica and Oceania, and they are certainly among the animals most commonly encountered in everyday life. Despite this, the authors of this volume identify worrying gaps in squirrel conservation. Squirrels are often hunted, trapped, poached, and stressed, and management strategies and legislation are often devised in the absence of proper knowledge of issues such as population sizes, taxonomies, and trends. Together, this can result in severe population declines and even species extinction. By assessing their taxonomic situation, ecology, the evolution and divergence of Sciuridae around the globe, and squirrels’ well-being across habitats, the authors set a baseline from which to launch future investigations into the conservation of squirrels and other species. Additionally, the authors highlight the influences of climate change, unsustainable growth, and various man-made threats to the future of this family.
Wildlife Review
Author:
Publisher:
ISBN:
Category : Wild life, Conservation of
Languages : en
Pages : 716
Book Description
Publisher:
ISBN:
Category : Wild life, Conservation of
Languages : en
Pages : 716
Book Description
Red Squirrel Ecology and Coexistence with Gray Squirrels in Northern Wisconsin Mixed Forests
Author: Dennis Alan Riege
Publisher:
ISBN:
Category : Gray squirrel
Languages : en
Pages : 374
Book Description
Publisher:
ISBN:
Category : Gray squirrel
Languages : en
Pages : 374
Book Description
Mammal Community Dynamics
Author: Cynthia J. Zabel
Publisher: Cambridge University Press
ISBN: 9780521008655
Category : Nature
Languages : en
Pages : 740
Book Description
Table of contents
Publisher: Cambridge University Press
ISBN: 9780521008655
Category : Nature
Languages : en
Pages : 740
Book Description
Table of contents