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Protein markers have been used to determine genetic differences in animal populations. Electrophoresis on disc acrylamide gels of red cell haemolysates from two reproductively isolated species of grey kangaroos, the eastern grey kangaroo, Macropus giganteus Shaw, 1790. and the western grey kangaroo, M. juliginosus (Desmarest, 1817), revealed two patterns of lactate dehydrogenase isozymes, pheno­ types D and E, and also Em, a modified form of phenotype E. Examination of phenotype frequencies in grey kangaroos revealed that the occurrence of lactate dehydrogenase type D was highest in M. giganteus from eastern Australia, significantly lower in the sympatric M .. f. melanops, found infrequently in M. f ocydromus from south-western Australia, and absent from M. f juliginosus from Kangaroo I. Disparity in lactate dehydrogenase phenotype frequencies between geographically distinct groups of grey kangaroos may result from the operation of the "founder" principle, or the maintenance of these differences in frequencies by natural selection, within reproductively isolated populations. This suggests that incipient speciation may be proceeding in western grey kangaroos.

The distribution of Red Cell Lactate Dehydrogenase Types in Gray Kangaroos