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STUDIES ON FOOD HABITS AND PREDATION PATTERN
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adults Alaska alcids April Arctic Arctic Tern average banded Barrow's Goldeneye behavior biomass birds breeding season broods Cade census clutch CM rH CN rH colonies Common Merganser courtship df=l ducks ecology eggs feathers females fledging food composition food habits food remains G-test Greylag Goose Gyrfalcon Falco rusticolus Gyrfalcon nest Gyrfalcon population Gyrfalcon territories Gyrfalcons in Iceland habitat heathland territories importance of Ptarmigan incubation intermediate territories June juveniles killed by Gyrfalcons late Meadow Pipit Merlin Merlin territories moult natal territory NE-Iceland nest sites nesting cliff nesting territories nestling period Newton number of young observed occupancy passerines pellets Peregrine Falcon Piatt Pink-footed Goose predators prey remains Ptarmigan population Puffins raptors Ravens rH CM ro rH Rock Ptarmigan seabird seabird colonies sex ratio shorebirds Snowshoe Hare Sokal and Rohlf spring study area summer Table territories in NE-Iceland total number TTT TTT TTT vulnerability waterfowl winter