Nutritional implications of molt in male Canvasbacks: variation in nutrient reserves and digestive tract morphology

Article Abstract:

Male Canvasbacks' failure to show deficits in nutrient reserves of somatic lipids, proteins and minerals, may be attributable to the nutritional requirements for molt. Ingesta-free body mass of male Canvasbacks is minimum during remigial molt, and fluctuates with storage and catabolism of lipids. The birds have low reliance on endogenous fat, protein and mineral to satisfy nutrient requirements for molt. The total body protein during postreproductive molts remains quite stable, but shows alterations in the distribution of muscle tissue in molting birds.

Analysis, Physiological aspects, Molting, Animal nutrition, Digestive organs, Digestive system, Canvasback, Canvasback (Duck)

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Movements, habitat use, and survival of nonbreeding Piping Plovers

Article Abstract:

Research describing the behaviour and survival of Piping Plovers (Charadrius melodius) overwintering at Laguna Madre, Texas is presented. Observations of strong site fidelity and high survival rates are examined in the context of declining populations.

Plovers

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effects of anthropogenic food sources on movements, survivorship, and sociality of Common ravens in the Arctic

Article Abstract:

Research describing the survival and behavior of Common Ravens (Corvus corax) at a concentrated food source is presented. In particular the factors causing the formation of large nomadic foraging groups are investigated.

Ravens

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