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Sexual differences in survival and recovery rates of lesser snow geese



Sexual differences in survival and recovery rates of lesser snow geese



Journal of Wildlife Management 56(2): 287-296



Estimates of sex-specific survival have rarely been documented in geese and, unless examined carefully, may be biased due to differential migration among sexes. Consequently, we tested, for sexual differences in survival and recovery rates in lesser snow geese (Chen caerulescens caerulescens) based on 30,000 hunter recoveries of 230,000 banded geese from the mid-continent population between 1950 and 1988. (.hivin.S = 0.36) from La Perouse Bay (LPB) were lower than those for females (.hivin.S = 0.40, P < 0.0001), but this was due almost entirely to bias in the estimates caused by emigration of males to migration routes with lower recovery rates. There were indications from other data sets that adults males averaged higher survival than females, but difference could not be quantified because of similar bias. Such bias is a potential problem in any analysis of species with differential dispersal of the sexes, and we recommend that survival analyses bases upon recoveries be accompanied by a careful examination of the distribution and pattern of recoveries.

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Accession: 007788988

Download citation: RISBibTeXText

DOI: 10.2307/3808825


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