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By M. Morrison

Reviews in Avian Biology is a chain of works too lengthy for The Condor, released at abnormal periods through the Cooper Ornithological Society.

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Extra info for Avian Foraging Theory Methodlogy and Applications (Studies in avian biology)

Example text

They generally do not, based on my literature search. Occasionally authors will compare two methods of sampling food and presume that agreement between the two means that either is valid. For example, Ault and Stormer (1983) vacuumed the soil and got the same seed types that scraped samples produced, so they concluded that any dietary deviation from the sample would reflect a food “preference” by birds. A correlation between the abundance measure of two samples does not, however, validate either as an adequate measure of food availability.

For each of the foraging behaviors considered here, I have summarized (Table 2) whether the behavioral act is likely to be reliable as an indicator of food availability (based on the consistency of published results where both the behavior and prey density were measured). I have also included a list of nonfood-related variables found to affect a given behavior, so that they might be controlled as much as possible. It is important to note that the behavioral acts outlined here are those for which published information exists.

Neither Davies (1977a), Morse (198 l), Moller (1983), nor Roland et al. (1986) found correlations between their measures of food availability and feeding rate. Careful examination of methods, however, revealed that food availability was not measured well or was not the only variable likely to have influenced feeding rate. Specifically, Davies measured prey availability by using a cumulative-total trap method, which may not have reflected food availability accurately over a smaller portion of the day.

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