Patch use in cranes: a field test of optimal foraging predictions

Article Abstract:

A study has been conducted to examine patch use in the common cranes, Grus grus, using prescient, Bayesian and fixed-time models. Observations on 14 radio-tagged free-living cranes followed a Bayesian trend, with food intake rates on leaving patches varying with patch and habitat quality. Cranes have been observed to stay longer in patches with larger flocks, but leave richer patches earlier and at higher intake than poor patches. These suggest that foraging behaviour in cranes is directly related to their energy balance.

Behavior, Cranes (Birds)

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Statistical analysis of the dichotomous preference test

Article Abstract:

The statistical framework of the dichotomous preference test is discussed. It is suggested that the underlying models be linked in a general class of models to be arranged in a hierarchy. The results of a dichotomous preference experiment can be analyzed within the framework of the logit model. Finally, a series of models between the too simple random-choice model and the uninformative full model can be chosen from,with necessary concessions and adjustments.

Analysis, Biometry, Logits

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Statistical models of transitive and intransitive dominance structures

Article Abstract:

A new statistical model to analyze dominance data based on generalized linear models is presented. The model integrates the traits of the competing individuals and the dominance interactions as covariates. Two intransitive dominance structure models can be constructed by including a particular interaction term that accounts for the relatedness of the individuals involved in the dominance interactions in the analysis.

Models, Social hierarchy in animals, Dominance (Animal behavior)

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