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Comparative Study
Journal Article
Molecular genetics of avian proteins. XIII. Protein polymorphism in three species of Australian passerines.
Australian Journal of Biological Sciences 1975 December
An introduced species, the house sparrow (Passer domesticus), and two Australian native species, the welcome swallow (Hirundo tahitica neoxena) and the fairy martin (Petrochelidon ariel), have moderately low levels of protein polymorphism compared with domesticated or semi-wild 'managed' species of birds. Genetically varient proteins in these birds include transferrin, esterase, phosphoglucomutase, NADP-dependent isocitrate dehydrogenases, phosphogluconate dehydrogenase (decarboxylating) and glucose-6-phosphate dehydrogenase. Egg-white protein polymorphism confirms heterogeneity of egg colour, markings and shape, and suggests that approximately 10% of the 'clutches' in house sparrow nests represent infidelity (intraspecific nest parasitism). For the four enzymes capable of supplying reduced NADP for reductive biosyntheses in growth and detoxification, the house sparrow has more heterozygosity (29%) than either the welcome swallow (9-4%) or the fairy martin (2-3%) and the difference is highly significant statistically. The results are discussed in relation to possible biochemical correlates of MacArthur and Wilson's (1967) evolutionary strategies or r or K selection.
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