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- Title
SURVIVAL AND CAUSE-SPECIFIC MORTALITY OF NORTHERN BOBWHITES IN WESTERN OKLAHOMA.
- Authors
Cox, Scott A.; Peoples, Alan D.; Demaso, Stephen J.; Lusk, Jeffrey J.; Guthery, Fred S.
- Abstract
We present descriptive data on survival and cause-specific mortality of northern bobwhites (Colinus virginianus) in western Oklahoma, USA, during 1991-2002. We captured and radiomarked 2,647 bobwhites (286 adult [ad] M, 1,064 juvenile [juv] M, 185 ad F, and 1,049 juv F) to obtain estimates. We estimated that annual survival (Nov-Oct) averaged 0.068 ± 0.018 (SE) and ranged between 0.018 ± 0.048 and 0.211 ± 0.038. We pooled data over the study period and found that sex-age classes survived at similar rates. We estimated average annual isolated rates of bobwhite mortality (rates in the absence of other causes) to be 0.63 ± 0.027 from raptor predation, 0.45 ± 0.021 from mammal predation, and 0.45 ± 0.043 from harvest. Under the additive theorem of probability, the isolated rates translated to an average annual mortality rate of 0.88 ± 0.017. The bobwhite population had variable and sometimes low survival in November-February inclusive. Low monthly survival (<0.5, n = 7) during winter was due primarily to harvest (0.57 ± 0.099 losses/known-fate individual) and raptor predation (0.25 ± 0.051 losses/knownfate individual). We discuss evidence indicating that radiotransmitters handicapped bobwhites and resulted in survival estimates biased low and to uncertainty in interpretation of cause-specific mortality.
- Subjects
OKLAHOMA; UNITED States; NORTHERN bobwhite; MORTALITY; SURVIVAL behavior (Animals); PREDATION
- Publication
Journal of Wildlife Management, 2004, Vol 68, Issue 3, p663
- ISSN
0022-541X
- Publication type
Article
- DOI
10.2193/0022-541X(2004)068[0663:SACMON]2.0.CO;2