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- W2555869673 abstract "period. Finlay (1971) used mechanically recorded visits to the nest cavity as an index of feeding activity in Purple Martins (Progne subis). He assumed that food was brought to the nestlings on each visit. His results showed an increase in visits to the nest cavity with increased brood size, but the increase was not proportional to the number of nestlings involved. Finlay's study raises a number of questions concerning amount of food fed to individual nestlings in broods of various sizes: (1) are parent birds able to maintain constant energy intake by individual nestlings when brood sizes are larger by increasing the proportion of feeding visits to the nest or, (2) can they compensate for a larger brood by bringing either a greater biomass of food per feeding visit or, (3) does the decreased surface-area-to-volume relationship in larger broods enable individuals to maintain themselves sufficiently on a lower biomass of food? I tried to answer these questions in Finlay's study area on the shore of Astotin Lake (530 40' N, 1120 50' W) in Elk Island National Park, Alberta, where martins were nesting colonially in artificial nest boxes during the summers of 1970 and 1971." @default.
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- W2555869673 date "1978-01-01" @default.
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- W2555869673 title "FOOD OF NESTLING PURPLE MARTINS" @default.
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