This book describes the results of a long-term study of the
ecology, evolutionary genetics and sociobiology of a seabird, the
Arctic Skua. This species is polymorphic: the birds show one of
three, genetically different forms of plumage - pale, intermediate
and dark. The forms vary in frequency from predominantly pale in
the north to dark in the south. The study was undertaken with the
aim of explaining how natural and sexual selection act to maintain
all three forms of skua in its populations. The results show that
natural selection for pale is balanced by sexual selection for
intermediate and dark. Models derived from Darwin's theories of
female choice and sexual selection in monogamous birds fit the
breeding data of the Arctic Skua. Darwibn's views on sexual
selection are fully confirmed. The study produced original data on
breeding ecology, demography, population regulation, sexual
behaviour and territoriality. A chapter on feeding ecology is also
included in the book, which gives a complete and largely original
account of the population ecology and sociobiology of a single
species of bird.
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