Variation in incubation periods and egg metabolism in mallards: intrinsic mechanisms to promote hatch synchrony

Article Abstract:

The variables that can influence incubation time and metabolic rates of mallard eggs that undergo incubation under fixed environmental conditions were examined. Results found variation among females in the time needed to reach the star-pipped stage of hatch but not in the laying sequence or egg size. Variation in metabolic rate of eggs was also observed in the laying sequence and among females. No variation in metabolic rate was found with egg volume or incubation length. Metabolic rate may have a synchronization role for hatching.

Research, Metabolism, Bird eggs, Bird nests, Mallard

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Incubation behaviour of spectacled eiders on the Yukon-Kuskokwim Delta, Alaska

Article Abstract:

The incubation behaviour of Spectacled Eiders on the Yukon-Kuskokwim Delta has been studied, to relate incubation constancy to changes in body weight and environmental factors. Incubation constancy varied amongst females but was not linked to changes on body weight or incubation period. Ambient temperature did not influence incubation recess length, although there was considerable variation in daily incubation constancy, nest cooling, recess frequency and length.

Eider

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Incubation behavior of Northern Shovelers in the subarctic: A contrast to the prairies

Article Abstract:

Patterns of nest attendance of Northern Shovelers at Minto Flats were compared with incubation rhythms of Northern Shovelers on a geographic scale. Variations in incubation rhythms amongst females nesting in one location were also studied. The results suggest that females at Minto have difficulties in obtained food resources during incubation, compared to females in the prairies.

Birds

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