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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 1910

Andreas Anlauf; Enzyme variability of Tubifex tubifex (Muller) (Oligochaeta, Tubificidae) and seven other tubificid species. Arch.Hydrobiol. 139(1):83-100, 1997

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In the course of studies on populations of Tubifex tubifex, eight different tubificid species were analysed using horizontal starch gel electrophoresis. Within the species Tubifex tubifex the mean value of enzyme polymorphism was at least 0.44 and a high degree of heterozygosis (H=0.40) occurred. Two dominating genotypes were recorded which could be characterized by PGI and IDH alleles (Type "A": PGI22/IDH35, 30.1%; Type "B": PGI23/IDH11, 44.1%). Based on distinct allele frequency differences and a lack of hybrids with other PGI alleles, I suggest that one additional type (Type "C": PGI11, 6.7%), may be considered a distinct race of Tubifex tubifex. The enzyme loci PGI, IDH, and PGM each showed species-specific alleles and facilitated identification. The cluster analysis of genetic similarities demonstrated a high similarity between the euryoecious and widespread species Limnodrilus hoffmeisteri, Potamothrix hammoniensis and Tubifex tubifex.