Differential survival rates have important implications for demographic changes in populations exposed to contaminants. The Quotient Method assumes that mortality does not vary among individuals exposed to a contaminant. Recruitment of male and female juveniles was lower in female-biased populations than in the other two treatment groups. Juvenile females took significantly longer to breed in female-biased populations than in the other two treatments. High populations of males had no measurable affect on demography.
Differential mortality has the potential to alter population dynamics in exposed populations.
These results are being prepared for submission to the Journal of Mammalogy. M.S. Thesis, Oregon State University, Corvallis, OR, 1998. Individual and demographic responses of the gray-tailed vole to vinclozolin. Factors affecting risk assessment of small mammals to pesticides. Statistical power to detect main and interactive effects on small mammal population measures.