Written in English
The hypothalamic-pituitary-adrenal (HPA) axis is critical for successful adaptation to stressors. However, life-long exposure to stressors has been proposed to cause deterioration of the HPA axis, and to have negative effects on physiological condition and survival. My objective was to determine if life-long exposure to stressors caused the HPA axis of free-ranging male northern red-backed voles (Clethrionomys rutilus) to become dysfunctional, and had a negative effect on survival. I examined the changes in the HPA axis that occurred in response to manipulated and natural levels of stressors. Life-long exposure to stressors had a negative effect on physiological condition and survival; however, it did not lead to deterioration of the HPA axis. In conclusion, my findings indicate that voles experience age-related physiological deterioration; however, they most likely do not live long enough to experience dysfunction of the HPA axis because they are exposed to high levels of extrinsic mortality.
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Red-backed voles are small, slender voles of the genus Myodes found in North America, Europe, and Asia. The genus name comes from the Greek "keyhole mouse". In the past, the genus has been called Evotomys or Clethrionomys, but Myodes takes precedence.. Red-backed voles inhabit northern forests, tundra and feed on shrubs, berries and : Mammalia. Northern red-backed voles use surface runways through the vegetation as travel corridors. Nests are built in short burrows or under some protective object such as a rock or root. Northern red-backed voles are active all winter and construct long tunnels under the snow. Winter nests typically are placed on the ground among thick : Cricetidae. The leukocyte number index for the innate immunity was the only physiological trait that declined with age of red-backed voles. Contrary to the data obtained on wild animals (Novikov and Moshkin. Previous studies have revealed that the local population of northern red-backed voles has constantly high density, with low fluctuations but regular 3-year cyclicity and clear manifestations of.
The boreal red-backed vole, also known as the southern red-backed vole, is an extant species of rodent that is currently found throughout Canada and the mountainous and extreme northern portions of the U.S. It had a more southerly distribution during the last ice age, and serves as an indicator of cooler temperatures during that time. From to , we captured individual southern red-backed voles with a total effort of 9, trap-nights. The time series of the southern red-backed vole population showed 2 major fluctuations of densities in both types of forest stands. However, the amplitude of the fluctuations was more pronounced in the black spruce forest sites Cited by: 9. likely requirement of Red-backed Voles (Zwolak ). Most research on habitat relationships of Red-backed Voles has focussed on the California Red-backed Vole (M. californicus), which may have diferent habitat requirements than the Southern Red-backed Vole (M. . Red-backed voles range from British Columbia to mainland Newfoundland and throughout the northern United States from the Rocky Mountains to the Appalachians. Red-backed voles inhabit cool, mossy evergreen forests with stumps, logs, or brush piles used for nesting. Diet: Red-backed voles are omnivores - they eat plants and animals. Their diet.
The head and body of red-backed voles measure from 70 to mm in length. The tail is an additional 25 to 60 mm. On average, they weigh g, but individuals weighing between 6 and 42 g have been recorded. Red-backed voles have dense, long, soft fur in winter, and shorter, coarser fur in summer. Habitat ecology of a relict red-backed vole population in Iowa William Simon Blagen Iowa State University served as a natural area. In a sheltered pocket among the knolls lies the It was along its northern border in that the red-backed vole was discovered far south of its known range (Polder, ). Objectives of this investigation. To test the hypothesis of relationship between the age at maturity, metabolic rate, and life span of rodents, variation in bioenergetic parameters in northern red-backed voles (Myodes rutilus) was analyzed depending on their reproductive status and type of ontogeny. Standard metabolic rate was found to be significantly lower in young of the year that remained nonreproductive in the year of Cited by: 4. We review the population dynamics of red-backed voles (Myodes species) in North America, the main deciduous and coniferous forest-dwelling microtines on this continent, and compare and contrast their pattern with that of the same or similar species in identify 7 long-term studies of population changes in Myodes in North America. Using autoregressive and spectral Cited by: