Foraging efficiency in Barnacle Geese Branta leucopsis: a functional response to sward height and an analysis of sources of individual variation
作者： A. Lang , Jeffrey M. Black
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摘要: The functional response and variation in foraging efficiency of captive Barnacle Geese was measured on pasture sward. Intake rates were calculated for a range grass sward heights using direct measurements peck rate, bite height number leaves removed with each bite. found to be curved reaching maximum at 85 mm then declining. Each the three components intake rate responded differently height. Peck declined steadily increasing whereas increased throughout used. per showed height, 90 There significant differences between individuals taken Multiple regression analysis age, sex, body size bill that 73% could explained by age goose, where more older geese. results are discussed relation other studies geese salt-marsh grazers pasture.
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