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Food Selection by Willow Grouse Lagopus lagopus Chicks in Northern Norway
Tor K. Spidsø
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 11, No. 2 (Jun., 1980), pp. 99-105
Stable URL: http://www.jstor.org/stable/3675914
Page Count: 7
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The food of Willow Grouse chicks, based on the content of 96 crops from 1974 and 1975, is given. The food items eaten were studied in relation to the availability. Highly preferred plant species were Vaccinium myrtillus, V. uliginosum and Polygonum viviparum. Adult Diptera and Hemiptera and Lepidoptera larvae were the most important animal food. Per cent dry weight of animal food declined from some 60 in chicks 0-3 d old, to less than 5 in chicks older than three weeks. Choice of invertebrates depended more on availability than did the choice of plants. The activity of the insects did not seem to affect the chicks' choice of these food items, however, very fast insects like Phoridae were little eaten. Willow Grouse chicks selected for bigger than average-sized insect prey.
Ornis Scandinavica (Scandinavian Journal of Ornithology) © 1980 Nordic Society Oikos