By M. Morrison
Reviews in Avian Biology is a chain of works too lengthy for The Condor, released at abnormal periods via the Cooper Ornithological Society.
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Extra info for Avian Foraging Theory Methodlogy and Applications (Studies in avian biology)
Future studies may be strengthened if such behaviors are used to confirm that a given measure of food availability is appropriate. Food availability; prey density; stomachcontents;functional response;feeding rates; searchtactics;time budgets. Key Words: INTRODUCTION Of biological parameters that might influence the evolution of adaptations among species, the distribution and abundance of food, predators, and mates are especially important (Krebs and Davies 1987). Virtually every aspect of the life cycle of an individual has been molded to some degree by those variables, as Crook (1964) began to demonstrate in his classic studies of social organization of weaver finches.
Remarkably, species that are known to feed on the ground during most other times of the year [American Robin (Turdus migratorius), Chipping Sparrow (Spizella passerina), and Dark-eyed Junco (Bunco hyemalis)] fed extensively on larvae in trees from mid-June to mid-July; the entire insectivorous bird community appeared to rely on this single food source during the breeding season. Recognition that forest birds depend heavily upon lepidopteran larvae at this time is nothing new (MacArthur 1959, Robinson and Holmes 1982) but the preponderance ofwestern spruce budworm larvae in both field samples and diets means that food availability should be exceptionally easy to estimate in that habitat type at that time of year.
Even if fruit species A were the only prey type sampled from the environment and the only prey type found in stomachs, not all fruits are equally accessible; a mere tally of the appropriate food type may be an inadequate representation of food availability. In short, without accounting for a bird’s perception, simple biomass measures (even “adjusted” ones) are probably poor reflections ofactual food abundance available to birds (see also Moermond, this volume). We ignore scale-of-measurement problems.
Avian Foraging Theory Methodlogy and Applications (Studies in avian biology) by M. Morrison