Allozyme Variation in Schilbe intermedius Rüppel, 1832 (Pisces: Siluriformes) From Two Localities in the Limpopo River System, South Africa
1997; Elsevier BV; Volume: 117; Issue: 2 Linguagem: Inglês
10.1016/s0305-0491(96)00291-x
ISSN1879-1107
AutoresG.D. Engelbrecht, F.H. van der Bank, P.F.S. Mulder,
Tópico(s)Fish Ecology and Management Studies
ResumoAn electrophoretic analysis of enzymatic proteins was performed on two populations, representing a river and a dam population of Schilbe intermedius. Of the 60 analysed loci, only 3 presented polymorphism. Allele frequencies at all 3 loci deviated from Hardy–Weinberg expectations. The river population displayed a higher degree of genetic variability (H = 0.7 ± 0.007%) compared with the dam population (H = 0.4 ± 0.003%). These results indicate that the schilbeids have lower heterozygosity values than most other fish species. Possible reasons for the low variability values obtained are discussed, and we also suggest that measures should be taken to conserve the little genetic variation present in this species.
Referência(s)