Abstract
We review compositional analysis for testing whether animals use habitats in proportion to their availability (i.e., random use). We illustrate aspects of this method with goshawk habitat use data collected in southeast Alaska. Compositional analysis addresses several inadequacies of other habitat selection testing approaches. As the appropriate summary measure for use with compositional analyses, we propose the geometric mean selection ratio. However, caution must be used in interpreting results based on compositional analysis. It is not clear what definition of selection (i.e., analysis method) is best in all cases, and hypothesis tests of selection allow only narrow conclusions to be drawn without additional data or assumptions.
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