Motivation and measures of accessibility

Article Abstract:

The effect of energetic state on measures of food accessibility was investigated in the European Starling based in four different foraging tasks. State was manipulated either by making two different numbers of prey items available after deprivation or using two deprivation times prior to the trial. Results revealed a signigicant difference in body mass change between the food deprivation conditions. In addition, energetic state manipulation influenced motivation to take the mealworm. A more highly depreived energetic state was associated with willingness to undertake risky foraging behaviors.

Behavior, Food habits, Starlings

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Risk-taking by incubating Common Goldeneyes and Hooded Mergansers

Article Abstract:

The nest defense behavior and risk of predator capture taken by cavity-nesting fowls Common Goldeneyes and Hooded Mergansers nesting near Sudbury, Canada, were investigated. Results showed that female cavity-nesting waterfowl would expose themselves to greater risk of predator capture to defend their clutch as clutch value increases. There were slight differences in the nest defense characteristics of Common Goldeneyes and Hooded Mergansers.

Predation (Biology), Eggs, Eggs (Biology), Incubation

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Analysis error in brood parasitism paper

Article Abstract:

The significant difference in nest success between parasitized and unparasitized nests of Gadwall (Anas strepera), Blue-winged Teal (Anas decors) and Northern Shoveler (Anas clypeata) in a previous study was due to an error in the calculation of the z-scores. Correction of the error gives non-significant differences in nesting success between parasitized and unparasitized nests for any of the species.

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