Showing papers by "Allan J. Baker published in 1987"
TL;DR: Populations of common mynas introduced to Australia, New Zealand, Fiji, Hawaii, and South Africa from India during the last century were compared genetically with the extant native population using isozyme electrophoresis of 39 presumptive loci.
Abstract: Populations of common mynas introduced to Australia, New Zealand, Fiji, Hawaii, and South Africa from India during the last century were compared genetically with the extant native population using isozyme electrophoresis of 39 presumptive loci. Average heterozygosity, mean number of alleles/locus, and the percentage of polymorphic loci are lower in the introduced populations, and the 18% loss of alleles involves only alleles that are rare in the native population. The native population is only weakly subdivided genetically (FST = 0.032) whereas the introduced populations are much more differentiated (FST = 0.123), and the mean genetic distance among them is significantly greater than among native samples. The reduction in mean number of alleles/locus and average heterozygosity is greatest in the South African population, consistent with a very small effective size in the founder population. In the introduced populations, random drift is implicated by the different subsets of polymorphic loci they possess, by their greater variance in allele frequencies, and by shifts either side of the native means. It is concluded that in the evolutionarily short period of 100-120 years, bottlenecks and random drift have promoted genetic shifts equal to those between different subspecies of birds.
169 citations
TL;DR: English chaffinches introduced by humans to New Zealand last century have, subsequently colonized the Chatham Islands about 800 km to the east Cultural evolution in songs of the chatham Island population was investigated by comparing a sample of 30 song, types with six equivalent samples from sites in New Zealand.
97 citations