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THE COMPARATIVE STABILITY OF POPULATIONS
THE SIGNIFICANCE OF CLUTCHSIZE IN BIRDS
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10-year cycle abundant adults Alpine Swift animals arctic average clutch birds Blue Tit Bobwhite breeding season broods California Quail cause cent Chapter chicks clutch-size Coal Tit colonies Common Swift Crossbill cyclic death-rate declines deer density-dependent disease ducks emigration Europe factors feeding females figures fish fluctuations food shortage food supply further gallinaceous birds habitat hatched Hence higher increase individuals insects irruptions juveniles Kluijver Lack Lapwing large numbers larvae lemmings limit losses males mammals migration mortality natural selection nest nestling nidifugous normally North America number of breeding number of eggs number of young numbers pairs parasites passerine peak pine population density predators prey proportion raise Red Grouse regions reproductive rate ringed Robin rodents Ruffed Grouse shown similar Song Thrush song-birds Sparrow Sparrowhawk species Spotted Woodpecker Starling starvation studied summer survival Swift Table territories Tinbergen usually variations various Varying Hare voles Warbler Waxwing winter woods Yellow-eyed Penguin