Tannin and protein in the diet of food-hoarding granivore, the Western Scrub-Jay

Article Abstract:

Dietary tannin in six captive food hoarding granivores, Western Scrub-Jays, suppresses protein, and the Jays are unable to physiologically counteract these inhibiting effects completely. When exposed to dietary lipids and proteins in artificial diets varying in tannin activity, the Jays show loss of mass with low-protein diet, and loss of most mass with a low-protein high tannin diet. These birds fail to show any significant changes in weight with lipid treatment.

Physiological aspects, Proteins, Tannins, Jays

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Ecological relationships of the two todies in Hispaniola: effects of habitat and flocking

Article Abstract:

Distinct foraging strata, substrates and maneuvers help in the coexistence of Broad-billed Todies, Todus subulatus, and Narrow-billed Todies, T. angustirostris, in shade coffee and pine habitats in Hispaniola. Solitary Broad-billed and Narrow-billed Todies occupy distinct microhabitats in both shade coffee plantations and native pine forest. Flocking behavior enhances their foraging by increasing the movement and feeding rates of both species of todies.

Natural history, Habitat partitioning (Biology), Habitat partitioning (Ecology), Hispaniola

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Bird-habitat relationships in a vegetational gradient in the Andes of Central Chile

Article Abstract:

Habitat associations of bird communities in a forest-scrub-steppe gradient in the Andes of central Chile was described based on a bird survey carried out during their late breeding season. Linear regression analysis and Pearson correlations revealed that relationship of the bird communities changes with the scale of analysis. The vegetational feature explains the diversity of bird species in Patagonian forests.

Behavior, Habitat (Ecology), Forest birds

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