Survival and hunting mortality of Pacific black ducks and grey teal
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To examine the importance of hunting mortality in the population dynamics of waterfowl in southwestern Australia, we estimated survival and recovery rates of 19,523 Pacific black ducks (Anas super-ciliosa) and 2,487 grey teal (A. gibberifrons) banded in 1968-76 and recovered by 1978. Both species showed strong evidence of year-to-year variation in survival rates, which averaged 63 +/- 4(SE)% and 56 +/- 6% for adult and young Pacific black ducks, respectively, and 55 +/-17% for adult grey teal. First-year recovery rates indicated the average annual hunting mortality over 6 years for Pacific black ducks and grey teal exposed to heavy hunting pressure was 23 +/-2% and 17 +/-2%, respectively. Hunting mortality was 9% in 1 year for Pacific black ducks exposed to light hunting. Estimates of mortality rate on opening day of hunting seasons at a site of intense hunting varied between 7 and 20% for Pacific black ducks and 5 and 16% for grey teal. In an intensively hunted waterfowl population in southwestern Australia, nearly 60% of all mortality of Pacific black ducks and 40% of grey teal mortality resulted from hunting. Hunting probably caused <25% of mortality in most parts of southwestern Australia, however, and there was no evidence of hunting reducing survival rates.
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