Landscape-dependent response to predation risk by forest birds

Article Abstract:

The effect of deforestation on the trade-off between foraging and antipredatory behavior of black-capped chickadees (Poecile atricapilla) in 24 landscapes during two winters is investigated. The increase in energy stress due to landscape deforestation promotes risk-taking and increases winter mortality through greater exposure to predators.

Influence, Deforestation

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Temporally fluctuating prey and coexistence among unequal conspecific interferers

Article Abstract:

The study suggests that a decreased relative cost to weaker interferers with increasing temporal fluctuations in prey availability is a potential mechanism for enhancement of coexistence of unequal conspecific interferers. The high amplitudes of fluctuation allow relatively lower foraging-rate costs in weaker interferers.

Foraging, Foraging (Animal feeding behavior)

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Food hoarding behaviour of black-capped chickadees (Poecile atricapillus) in relation to forest edges

Article Abstract:

Black-capped chickadees were found to hoard food during good weather away from forest habitat edges, thereby decreasing foraging retrieval costs during adverse weather conditions. Data were obtained from studies using bird feeders placed at 30 m from the forest edge and >100 m from the forest edge.

Canada, Spain, Statistical Data Included, Environmental aspects, Food supply

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