Abstract
A Leporinus lacustris population from the floodplain of Upper Paraná River was analyzed for genetic diversity by allozyme data. Specimens were sampled in Southern Brazil, at Lagoa do Carão (22o44’S/53o17’W) in the floodplain of Upper Paraná River. A total of thirty loci were identified in sixteen enzymatic systems (AAT, ACP, ADH, EST, GDH, G3PDH, G6PDH, GPI, IDHP, L-IDDH, LDH, MDH, MDHP, PER, PGM, and SOD), on 15% corn starch gel electrophoresis. Proportions of polymorphic loci were estimated as 26.67%. Expected heterozygosity was estimated as 0.0806 ± 0.0313, which was lower than previous estimates for L. friderici, L. elongates and L. obtusidens from the Tibagi River, a tributary of the Paraná River basin. The low heterozygosity of the L. lacustris analyzed population could be attributed to the sedentary habit of this species
Highlights
In Central and South America, the genus Leporinus of the Anostomidae family comprises 87 fish species (Garavello and Britski, 2003)
This work aimed at studying the genetic variability of a L. lacustris population from the upper Paraná River floodplain and at comparing it to that previously estimated for other Leporinus species from the other localities of Paraná River basin (Chiari and Sodré, 1999)
A total of 30 enzymatic loci were identified for L. lacustris specimens sampled in Lagoa do Carão at the Upper Paraná River floodplain
Summary
In Central and South America, the genus Leporinus of the Anostomidae family comprises 87 fish species (Garavello and Britski, 2003). The species Leporinus amblirhynchus, L. elongatus, L. friderici, L. lacustris, L. macrocephalus, L. microphthalmus, L. obtusidens, L. octofasciatus and L. striatus were described in the Upper Paraná River basin (Agostinho and Júlio Jr., 1999). The Nupelia research center, at the State University of Maringá, state of Paraná, Brazil, has studied the ecology of fish species in the Upper Paraná River floodplain. L. friderici and L. lacustris are among the ten most abundant dwelling in the floodplain (Luiz et al, 2004). The genetic variability of L. elongatus, L. friderici, L. obtusidens, Schizodon intermedius and S. nasutus from Tibagi River, a tributary of the Paraná River basin, was analyzed by allozyme (Chiari and Sodré, 1999) and by RAPD markers (Chiari and Sodré, 2001). Renno et al (1989, 1990) analyzed the genetic variability of L. friderici, L. granti, L. aff
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