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Differential Timing of Spring Migration in Wood Warblers (Parulinae)
M-Spring migration patterns of 18 species of paruline warbler at Prince Edward Point, Ontario showed that males arrived earlier than females in all species, consistent with the hypothesis that males are selected to arrive as early as food resources or climatic conditions are adequate, whereas females arrive later. Expand
Winter philopatry in migratory waterfowl
The authors' analyses indicate that geese, swans, and sea ducks show high levels of winter philopatry, with homing rates varying between 49 and 98% to small study areas, and that both genetic and ecological mechanisms may play a role in the evolution of philipatry to the wintering ground. Expand
Long-Term Decline in Body Size in a Snow Goose Population: Evidence of Environmental Degradation?
Goslings reared by individual adult females showed a decline in size over time, suggesting that the general decline reflects a non-genetic change in gosling growth rates during the fledging period, and this reduction in food availability may reflect over-exploitation of primary food plants by the geese. Expand
Body Size Variation in Lesser Snow Geese: Environmental Plasticity in Gosling Growth Rates
Goslings that grew more slowly due to the effects of hatch date or brood size were significantly smaller as adults, which may have a significant effect on various life history traits in this species. Expand
Long-Term Changes in Survival Rates of Lesser Snow Geese
The long-term changes indicate that mean values of age-specific survival rates are not adequate to describe the dynamics of this population of Snow Geese. Expand
Genetic polymorphism for alternative mating behaviour in lekking male ruff Philomachus pugnax
It is shown that differential morph development is genetically controlled and consistent with a single-locus, two-allele autosomal genetic polymorphism and several potentially relevant environmental factors do not appear to alter behavioural development. Expand
Age-specific costs of first-time breeding
The cost of first-time breeding in a population of Lesser Snow Geese nesting at La Perouse Bay, Manitoba, Canada is investigated and it is found that birds were less likely to be recaptured one year after their first successful breeding than on later occasions. Expand
The Snow Geese of La Perouse Bay: Natural Selection in the Wild
A fitness components model of Snow Goose life cycle Pairing, mating, and parental care, and annual variation in fitness components are studied. Expand
Intraspecific Variation in Commuting Distance of Marbled Murrelets (Brachyramphus marmoratus): Ecological and Energetic Consequences of Nesting Further Inland
Abstract Radio transmitters were deployed on Marbled Murrelets (Brachyramphus marmoratus) at Desolation Sound, British Columbia, Canada, during the 1998 breeding season to assess individual variationExpand
Environmental change and the cost of philopatry: an example in the lesser snow goose
The larger goslings in non-traditional feeding areas showed significantly higher firstyear survival, suggesting that the use of deteriorating traditional feeding areas may currently be maladaptive in this population. Expand