Patterns of Progesterone Secretion in Free-Living California Ground Squirrels (Spermophilus Beecheyi)1
نویسندگان
چکیده
منابع مشابه
The Effects of Livestock on California Ground Squirrels (Spermophilus beecheyii )
Understanding the impacts of livestock grazing on wildlands is important for making appropriate ecosystem management decisions. Using livestock exclosures, we examined the effects of moderate cattle grazing on the abundance of California ground squirrels (Spermophilus beecheyii Richardson) and the spatial distribution of active burrows within their colonies in grassland and blue oak (Quercus do...
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The study describes the daily activity of the European ground squirrel in an experimental plot, situated in a heavily grazed pasture near the town of Knezha, Northwestern Bulgaria. Above ground activity was recorded with a visual scanning procedure in summer and autumn of 2006. In summer animals emerged on an average 1.94 h after the civil twilight at dawn and the active period lasted about 11 ...
متن کاملFood Restriction Effects on the Body Composition of Free-living Ground Squirrels, Spermophilus belding
I conducted afield experiment to examine the use of body fat as an energy reserve by juvenile female Belding's ground squirrels, Spermophilus beldingi, prior to hibernation. Squirrels were divided into two groups: the squirrels in one group had their foraging times restricted by being placed in a cage forpart of each day for four consecutive days (deprived group), and the squirrels in the other...
متن کاملEnvironmental influences on spatial and temporal patterns of body-size variation in California ground squirrels (Spermophilus beecheyi)
Change in body size across geographical and temporal scales is a common way in which species, particularly mammals, respond to environmental variation (Dayan et al., 1991; Hadly, 1997; Ashton et al., 2000; Meiri & Dayan, 2003; Smith & Betancourt, 2006). Numerous studies have identified factors that influence geographical variation in body size within species, mainly focusing on climatic variabl...
متن کاملThe effects of wind turbines on antipredator behavior in California ground squirrels (Spermophilus beecheyi)
Electricity-generating wind turbines are an attractive energy source because they are renewable and produce no emissions. However, they have at least two potentially damaging ecological effects. Their rotating blades are hazardous to raptors which occasionally fly into them. And wind turbines are very noisy when active, a feature that may interfere with the lives of animals beneath them. We stu...
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ژورنال
عنوان ژورنال: Biology of Reproduction
سال: 1988
ISSN: 0006-3363,1529-7268
DOI: 10.1095/biolreprod39.5.1051