A Long-Term Age-Specific Survival Analysis of Female White-Tailed Deer

Autor: John R Fieberg, Michelle Carstensen Powell, Michael R. Riggs, Wei Pan, Glenn D. DelGiudice
Rok vydání: 2006
Předmět:
Zdroj: Journal of Wildlife Management. 70:1556-1568
ISSN: 1937-2817
0022-541X
DOI: 10.2193/0022-541x(2006)70[1556:alasao]2.0.co;2
Popis: We conducted a 13-year survival (i.e., time survived since birth) and cause-specific mortality study, divided into 2 phases (Phase I = years 1–6; Phase II = years 7–13), of 302 female white-tailed deer (Odocoileus virginianus) ≥0.6 years old at capture. The study spanned a period of extreme variability in winter severity (maximum winter severity indexes [WSI] of 45–195) and hunting pressure. Most studies of survival and cause-specific mortality of northern deer have assumed constant survival rates for adults of each sex (≥1.0 yr old pooled) and examined fawns (0.6 ≤ x ≤ 1.0 yr old) separately. We observed U-shaped hazard (i.e., instantaneous risk of death) curves for both phases of the study, indicating that risk of death is highest for younger and older individuals. The estimated hazard for Phase II was generally lower and relatively constant for adults 2–10 years old compared to Phase I, where the instantaneous risk of death began to increase at age 6 years. This difference likely reflected dif...
Databáze: OpenAIRE
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