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Survival of breeding male American woodcock in Maine



Survival of breeding male American woodcock in Maine



Canadian Journal of Zoology 74(11): 2046-2054



We radio-marked 150 male American woodcock (Scolopax minor) during 1987-1989 and estimated period survival for 1 April - 15 June. Survival varied from 0.690 (1989) to 0.924 (1988), with a 3-year mean (95% confidence interval) of 0.789 (0.693-0.885). Woodcock were killed by raptors (n = 14, 53.8%), mammals (n = 1, 3.8%), or unknown predators (n = 5, 19.2%); six deaths (23.1%) were from miscellaneous causes, including three (11.5%) from entanglement in the transmitter harness. A composite survival estimate based on telemetry studies for the breeding, postbreeding, and wintering periods was 0.471 (0.789 times 0.923 times 0.647). The calculated survival rates were 0.881 for the spring migration period and 0.853 for the combined hunting and fall migration period. In a proportional hazards model, body mass at capture was not related to survival. Forest type (hardwood versus conifers) affected survival (P lt 0.016), which was lower for woodcock using mostly conifer sites. Survival was related positively to mean snow depth in December (P lt 0.038), negatively to snow depth in April (P lt 0.046), and positively to minimum temperature in December (P lt 0.054) and April (P lt 0.066) in some analyses.

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Accession: 002973127

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DOI: 10.1139/z96-232


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