SEASONAL VARIABILITY IN THE USE OF SPACE BY WESTERN GRAY SQUIRRELS IN SOUTHCENTRAL WASHINGTON

• Published in: Journal of mammalogy Vol. 85; no. 3; pp. 511 - 516
• Main Authors: Linders, Mary J., West, Stephen D., Vander Haegen, W. Matthew
• Format: Journal Article
• Language: English
• Published: Provo, UT American Society of Mammalogists 01-06-2004; Brigham Young University, Department of Zoology; Oxford University Press
• Subjects: Animal and plant ecology; Animal behavior; Animal nesting; Animal, plant and microbial ecology; Animals; Autoecology; Biological and medical sciences; Breeding seasons; FEATURE ARTICLES; Female animals; fixed kernel; Forest habitats; Fundamental and applied biological sciences. Psychology; Habitats; home-range size; Life history; Male animals; Mammalia; Mammals; Mating behavior; Measures of variability; minimum convex polygon; Population density; Sciurus griseus; Seasonal variations; Species richness; Squirrels; tree squirrels; Trees; Vertebrata; Washington; western gray squirrel; Wildlife ecology; Wildlife habitats; United States; North America; America; Space; Vertebrata; Territory; Mammalia; Radiotelemetry; Investigation method; Home range; Use; Sexual dimorphism; Field study
• ISSN: 0022-2372; 1545-1542
• DOI: 10.1644/1545-1542%282004%29085%3C0511%3ASVITUO%3E2.0.CO%3B2

A lack of quantitative information on life history of the western gray squirrel (Sciurus griseus) has hampered conservation and management efforts across its range. We report on data from 21 squirrels radiotracked in Klickitat County, Washington, from 1998 to 1999 to examine the interaction between home-range size, sex, and season. Home-range estimates were calculated by using minimum convex polygon and fixed kernel methods. Only adult animals with ≥40 relocations were included in total home-range comparisons. Estimates of 95% minimum convex polygon home range in Washington averaged 73.0 ha for males (n = 9) and 21.6 ha for females (n = 12) for year-round use, significantly larger than those from Oregon and California. Differences in home-range size of males and females were significant. Fixed kernel and minimum convex polygon estimates were similar in size. We suggest that near the northern limit of the species' geographic range low species richness, low abundance, and a patchy distribution of mast-producing vegetation result in large male and female home ranges, low overlap of female home ranges, and a sparsely distributed squirrel population.