Home Range Use by Abert Squirrels: A Comparative Analysis

Halloran, Margaret E.; Bekoff, Marc

doi:10.2307/3672827

Cited by 7 publications

(9 citation statements)

References 15 publications

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“…Mating season was defined as the period during which females could possibly enter estrus. We used similar season lengths as other studies on Abert's squirrels (Farentinos 1979;Halloran and Bekoff 2000) to facilitate comparison. A plot of home-range size versus number of locations reached an asymptote at approximately 25-30 fixes.…”

Section: Discussionmentioning

confidence: 99%

“…Abert's squirrels have among the lowest reported densities and largest home-range sizes for Holarctic tree squirrels (Gurnell 1987). Previous studies on home-range characteristics of Abert's squirrels have found contradictory evidence for sexual differences in home-range size (Farentinos 1979;Halloran and Bekoff 2000;Lema 2001). Home ranges from these studies, however, were either created from opportunistic sightings rather than from random locations (Farentinos 1979;Halloran and Bekoff 2000) or were based on low numbers of locations per individual (Lema 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Sexual differences in reproductive strategies of tree squirrels suggest that space use may vary between sex and season. Patterns of seasonal changes in home-range size of tree squirrels are ambiguous, with some studies reporting that home-range size does (Thompson 1978;Farentinos 1979;Koford 1982;Kenward 1985;Wauters and Dhondt 1992;Lema 2001) or does not vary between non-mating and mating seasons (Cross 1969;Foster 1992;Halloran and Bekoff 2000;Linders et al 2004). Other factors besides reproductive strategies, such as food and nest resources, and population density may affect tree squirrel home-range size between seasons (Don 1983;Linders et al 2004;Lurz et al 2000;Wauters and Dhondt 1992).…”

Section: Introductionmentioning

confidence: 99%

“…The Abert's squirrel is reportedly a specialized herbivore thought to depend on ponderosa pine for food and nest sites (Keith 1965;Patton and Green 1970;Stephenson 1975;Pederson et al 1976;Hall 1981;Snyder 1993;Halloran and Bekoff 1994;States and Wettstein 1998). Both sexes are similar in size (Nash and Seaman 1977) and non-territorial with overlapping home ranges (Farentinos 1979;Halloran and Bekoff 2000). Abert's squirrels consume a variety of seasonally available food items that include fungi and conifer seeds, staminate flowers, buds, and inner bark (Stephenson 1975).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal changes in home ranges of Abert's squirrels: impact of mating season

Edelman

Koprowski²

2006

Can. J. Zool.

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We compared home ranges of introduced Abert's squirrels (Sciurus aberti Woodhouse, 1853) in mixed-conifer forests of Arizona during non-mating and mating seasons. Because Abert's squirrels are reported to depend on ponderosa pine (Pinus ponderosa P. & C. Lawson) forests, the mixed-conifer forest in our study represented a novel habitat. Home-range size, home-range overlap with females, and movement distances increased for males from non-mating to mating seasons. Home-range size and overlap characteristics of females remained consistent between seasons, but movement distances were reduced during the mating season. Males probably increased home-range size, home-range overlap with females, and movement distances during the mating season to maximize contact with scarce females. Home-range size and overlap characteristics of female Abert's squirrels likely remained stable between seasons because females do not search for mates. Restricted movements by females during the mating season may be due to changes in resource use in preparation for reproduction. Non-mating season home ranges in our study were smaller than home ranges observed in ponderosa pine forest. Abert's squirrels in mixed-conifer forest may have small home ranges because resource quality is higher than in ponderosa pine forest or competition for space with co-occurring Mount Graham red squirrels (Tamiasciurus hudsonicus grahamensis (J.A. Allen, 1894)).

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal changes in home ranges of Abert's squirrels: impact of mating season

Edelman

Koprowski²

2006

Can. J. Zool.

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“…Thus, MCP home‐range estimates were of limited use for drawing meaningful population‐level comparisons within our study area. Comparisons with previous studies documenting home range size could be erroneous unless the number of observations used to calculate home range size is approximately equal (Halloran and Bekoff ).…”

Section: Discussionmentioning

confidence: 79%

Diurnal space use and seasonal movement patterns of greater sage-grouse in Northeastern California

2014

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Greater sage-grouse (Centrocercus urophasianus) populations have declined throughout their geographic range, are considered a candidate species under the U.S. Endangered Species Act, and are regarded as a species of special concern in California, USA. Demographic parameters have been welldocumented for this species, but populations occupying the western periphery of their range have largely remained unstudied. We examined diurnal space use and seasonal movement patterns of greater sage-grouse in northeastern California. We collected 3,072 diurnal locations from 132 greater sage-grouse radiomarked between 2007 and 2009. Greater sage-grouse in our study used large areas and exhibited wide-ranging seasonal movements. Female greater sage-grouse sought suitable nesting habitat within 5 km of a lek; however, of the 27% (n ¼ 20/74) of females nesting >5 km from an occupied lek site, 53% (n ¼ 10/19) nested successfully. This suggests the proportion of nesting females located >5 km from an active lek is important for population viability in northeastern California. Moreover, the annual range of movements indicates that conserving greater sage-grouse habitat within 5 km of active lek sites is insufficient to maintain long-term population persistence. Larger areas of habitat are needed to conserve greater sage-grouse in northeastern California to accommodate seasonal movements, annual variation in habitat requirements, and to maintain connectivity between lek complexes. Ó 2014 The Wildlife Society.

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Seasonal patterns in behavior and glucocorticoid secretion of a specialist Holarctic tree squirrel (Sciurus aberti)

Zhang

Buck

2022

J Comp Physiol B

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Home Range Use by Abert Squirrels: A Comparative Analysis

Cited by 7 publications

References 15 publications

Seasonal changes in home ranges of Abert's squirrels: impact of mating season

Seasonal changes in home ranges of Abert's squirrels: impact of mating season

Diurnal space use and seasonal movement patterns of greater sage-grouse in Northeastern California

Seasonal patterns in behavior and glucocorticoid secretion of a specialist Holarctic tree squirrel (Sciurus aberti)

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