Electrophoretic contributions to the systematics of the freshwater crayfish genus Engaeus Erichson (Decapoda: Parastacidae)
1990
Horowitz, P. (Tasmania Univ., Hobart (Australia). Zoology Dept.) | Adams, M. | Baverstock, P. (South Australian Museum, Adelaide. Evolutionary Biology Unit)
From a total of 76 sample sets, a minimum of 30 distinct biological species have been delineated. Strong evidence from sites of both sympatry and allopatry suggest some further delineations of species but these must await additional discriminatory information. The results have confirmed low levels of heterozygosity in Engaeus species. Frequent isolation of small populations of Engaeus species, and consequent loss of allelic variation, is suggested as a possible cause of these low levels. Some species have shown variation of allelic frequencies over their geographical range and, in some cases, this variation could be interpreted as showing clinical properties. The electrophoretic data have been interpreted to produce some information regarding the phylogenetic affinities of delineated species. Several groups of species were found which shared closer intra-group relationships than they did to the other species of Engaeus.
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