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1 July 2000 Nestling Tree Swallow (Tachycineta bicolor) Diets in an Upland Old Field in Western Michigan
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We collected and identified 1852 prey items from 89 boluses delivered to 62 nestling tree swallows (Tachycineta bicolor) at 14 nests in an upland old field in western Michigan. We found that 90.8% of nestling diets was insects from the Orders Diptera, Homoptera, Hymenoptera and Coleoptera. We also found clam and snail shells in boluses. Over the most common brood sizes of 4–6 nestlings, brood size was inversely proportional to the number of items per bolus delivered to nestlings although mean dry and mean organic weight of boluses did not differ. Bolus composition was not influenced by weather conditions. Nestling diets at our study site were similar in the proportions of many prey items, such as Diptera and Homoptera, to tree swallow nestling diets in other habitats but contained fewer aquatic forms such as Odonata and Ephemeroptera.

MATTHEW E. JOHNSON and MICHAEL P. LOMBARDO "Nestling Tree Swallow (Tachycineta bicolor) Diets in an Upland Old Field in Western Michigan," The American Midland Naturalist 144(1), 216-219, (1 July 2000).[0216:NTSTBD]2.0.CO;2
Received: 1 August 1999; Accepted: 1 January 2000; Published: 1 July 2000
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