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By Tom Wassmer Assistant Professor of Biology at Siena Heights University in Adrian, Michigan
Carina Siutz, Eva Millesi
Hibernating species significantly reduce energy expenditure during winter by entering torpor. Nevertheless, the various benefits of hibernation might be counteracted by negative effects of torpor such as immune depression, oxidative stress, or neuronal impairment. Considering these trade-offs, adequate energy reserves could allow animals to reduce the time spent in torpor or the extent of metabolic depression. Common hamsters use food stores during hibernation and previously documented high individual variations in body temperature patterns during winter could, therefore, be related to differences in external energy reserves...
July 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Mathilde L Tissier, Yves Handrich, Jean-Patrice Robin, Mathieu Weitten, Paul Pevet, Charlotte Kourkgy, Caroline Habold
Over the last decades, climate change and agricultural intensification have been identified as two major phenomena negatively affecting biodiversity. However, little is known about their effects on the life-history traits of hibernating species living in agro-ecosystems. The European hamster (Cricetus cricetus), once a common rodent on agricultural land, is now on the verge of extinction in France. Despite the implemented measures for its protection, populations are still in sharp decline but the reasons for it remain unclear...
May 6, 2016: Scientific Reports
Agata Banaszek, Joanna Ziomek, Katarzyna A Jadwiszczak, Ewa Kaczyńska, Paweł Mirski
In anthropogenically disturbed habitats, natural barriers still exist and have to be recognized, as they are important for conservation measures. Areas of phylogeographic breaks within a species are often stabilized in inhospitable regions which act as natural barriers. An area of contact between phylogeographic lineages of the common hamster (Cricetus cricetus) was found in the Małopolska Upland in Poland. A total of 142 common hamsters were captured between 2005 and 2009. All hamsters were genotyped at 17 microsatellite loci and partial sequences of the mitochondrial (mtDNA) control region were obtained...
July 2012: Acta Theriologica
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