, Volume 86, Issue 5, pp 419-421

Allozyme analysis of two polymorphic enzymes in a natural population of Lecithochirium musculus

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Abstract

Genetic variability among 112 individuals of Lecithochirium musculus from Anguilla anguilla from northwestern Spain was examined using allozyme analysis. Starch-gel electrophoresis was used to investigate the genetic variation in two polymorphic enzymes, glucose phosphate isomerase (GPI) and phosphoglucomutase (PGM). The banding patterns obtained for GPI were consistent with a dimeric structure for this enzyme and with single-locus control. The inferred genotype frequencies did not significantly differ as compared with those predicted by the Hardy–Weinberg equation. Two PGM loci were detected (Pgm-1 and Pgm-2). Pgm-1 was polymorphic and showed a striking departure from Hardy-Weinberg predictions (total absence of heterozygotes for alleles in high frequencies), raising the possibility of the existence of two reproductively isolated populations. However, other reasons for this observation are discussed.

Received: 25 October 1999 / Accepted: 9 November 1999