Tree Voles PDF Download
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Author: Eric D. Forsman
Publisher:
ISBN:
Category : Tree voles
Languages : en
Pages : 128
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Book Description
Author: Mark H. Huff
Publisher:
ISBN:
Category : Douglas fir
Languages : en
Pages : 24
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Book Description
Author: Eric D. Forsman
Publisher:
ISBN:
Category : Tree voles
Languages : en
Pages : 128
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Book Description
Author: Eric D. Forsman
Publisher:
ISBN:
Category : Tree voles
Languages : en
Pages : 119
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Book Description
Author: Chad A. Marks-Fife
Publisher:
ISBN:
Category : Northern spotted owl
Languages : en
Pages : 129
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Book Description
Red tree voles (Arborimus longicaudus) are a unique species of Arvicoline rodent found in western Oregon and northwest California. Their preferred habitat is mature and old-growth coniferous forest dominated by Douglas-fir (Pseudotsuga menziesii). Tree voles are an important prey item for northern spotted owls and many other predators, but are extremely difficult to sample. As a result, little is known about their abundance or population dynamics. We used several methods to describe tree vole detectability, density, and population age structure. We verified a relationship between molar tooth development and age in red tree voles, allowing us to estimate the age of voles recovered in pellets regurgitated by spotted owls in Oregon. We found that the age distribution of tree voles in spotted owl pellets varied from year to year but not from region to region within the species range. We found evidence for a positive relationship between annual precipitation and the proportion of juvenile tree voles in owl pellets on one of two study areas. We conducted modified line-transect surveys at 31 locations representing three forest stand age classes (young, mature, old) in the Oregon Coast Range to visually detect potential red tree vole nests. We climbed trees where potential nests were detected from the ground in order to determine the species and the occupancy status of nests. We used the transect and climbing data and distance sampling techniques to estimate detection probabilities and density of active tree vole nest trees in relation to forest age class. Our surveys suggested that density of tree vole nest trees increased with forest age, whereas detection probability of nest trees decreased with forest age. Regardless of forest age, mean detection probability of nest trees was low (
Author: Mark E. Tobin
Publisher:
ISBN:
Category : Fruit
Languages : en
Pages : 24
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Author: Mark E. Tobin
Publisher:
ISBN:
Category : Apples
Languages : en
Pages : 24
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 924
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 564
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309051266
Category : Science
Languages : en
Pages : 188
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Book Description
In the years since the third edition of this indispensable reference was published, a great deal has been learned about the nutritional requirements of common laboratory species: rat, mouse, guinea pig, hamster, gerbil, and vole. The Fourth Revised Edition presents the current expert understanding of the lipid, carbohydrate, protein, mineral, vitamin, and other nutritional needs of these animals. The extensive use of tables provides easy access to a wealth of comprehensive data and resource information. The volume also provides an expanded background discussion of general dietary considerations. In addition to a more user-friendly organization, new features in this edition include: A significantly expanded section on dietary requirements for rats, reporting substantial new findings. A new section on nutrients that are not required but that may produce beneficial results. New information on growth and reproductive performance among the most commonly used strains of rats and mice and on several hamster species. An expanded discussion of diet formulation and preparationâ€"including sample diets of both purified and natural ingredients. New information on mineral deficiency and toxicity, including warning signs. This authoritative resource will be important to researchers, laboratory technicians, and manufacturers of laboratory animal feed.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 420
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Book Description
