Ref ID : 1947
Charles E. King and Yuqi Zhao; Coexistence of rotifer (Brachionus plicatilis) clones in Soda Lake, Nevada. Hydrobiologia 147:57-64, 1987
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Patterns of genetic variation among Brachionus plicatilis clones collected at different times from Soda Lake, Nevada (U.S.A.) were determined using polyacrylamide gel electrophoresis of isozymes. Six of the eleven enzymes assayed were variable. Three of these - malic dehydrogenase (MDH), cholinesterase (CHO), and phosphoglucomutase (PMG) - were selected to screen the 138 clones established from the field collections. Each enzyme revealed variation both within and between field samples. Thirty-eight of the 100 potential composite electromorphs formed by combining isozyme variants were found in the 138 clones. A substantial amount of genetic variation is therefore present. Patterns of electromorph frequency change resembled those reported for cladocerans. No evidence was found for a seasonal succession of distinct electromorphs. We suggest that the B. plicatilis in Soda Lake constitute a single population.