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Hormetic effects of gamma radiation on the stress axis of natural populations of meadow voles (Microtus pennsylvanicus)

Boonstra R, Manzon RG, Mihok S, Helson JE Environ. Toxicol. Chem. 2005 Feb;24(2):334-43 PMID: 15719993 Abstract We tested the hypothesis that low doses of gamma radiation have beneficial, hormetic effects on the stress axis (the hypothalamic-pituitary-adrenocortical axis) of free-ranging meadow vole populations (Microtus pennsylvanicus). Voles were exposed to chronic gamma radiation from a 137Cs field … Read More

Demography of short-tailed shrew populations living on polychlorinated biphenyl-contaminated sites

Boonstra R, Bowman L Environ. Toxicol. Chem. 2003 Jun;22(6):1394-403 PMID: 12785599 Abstract In ecological risk assessment, a key necessity is to understand how contaminants known to have negative impact on laboratory mammals affect the population demography of mammals living in their natural environment. We examined the demography of six local populations of the short-tailed shrew … Read More

Balancing food and predator pressure induces chronic stress in songbirds

Clinchy M, Zanette L, Boonstra R, Wingfield JC, Smith JN Proc. Biol. Sci. 2004 Dec;271(1556):2473-9 PMID: 15590598 Abstract The never-ending tension between finding food and avoiding predators may be the most universal natural stressor wild animals experience. The ‘chronic stress’ hypothesis predicts: (i) an animal’s stress profile will be a simultaneous function of food and … Read More