The timing of wing molt in tundra swans: energetic and non-energetic constraints

Article Abstract:

Molt in breeding female tundra swans occurred later than their mates and nonbreeding females. The timing of molt was related to the date of clutch hatching, with females having larger clutches molting earlier. These females were observed to have better body condition during molt. Molt in cobs did not vary between breeders and nonbreeders. These results suggest that the timing of molt in breeding females is affected by the energetic constraints of laying and incubation. However, non-energetic constraints, such as defending territory andyoung and the time available for breeding and molting are also significant.

Natural history, Energy metabolism, Tundras, Swans

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Frequency, timing and costs of intraspecific nest parasitism in the common eider

Article Abstract:

The intraspecific nest parasitism rate in a Canadian population of common eiders was found to be at least 30%. Parasitic eggs were usually laid early in the laying cycle of the host, often during the first two days. Parasitism rates were higher in areas with a high nesting density. Clutchsizes in parasitized and unparasitized broods were not significantly altered. The hatching and survival of ducklings were likewise unaffected.

Behavior, Eider, Parasitic birds, Animal behavior

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Body weight and feather growth of male Barrow's Goldeneye during wing molt

Article Abstract:

Wing molt in male Barrow's Goldeneye north of the Arctic Circle was investigated. Mean daily change in primary feather length was 2.6% and the mean length of the flightless periods was 31 days. Peak wing molt was between July 20 and August 23, and the mean body weight of adult males fell significantly during wing molt.

Physiological aspects, Waterfowl

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