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Preliminary analysis of the genetic variability of two natural beds of the Scallop Euvola ziczac (Linnaeus, 1758) in Brazil
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Advisor(s)
Abstract(s)
Euvola ziczac (formerly Pecten ziczac), a simultaneous hermaphroditic scallop was heavily fished in
Brazil between 1972 and 1980. The production peaked in 1980 with 8,800 tons and was followed by the
total collapse of the resource. In order to investigate the possible loss of genetic variability of the stock
associated to overfishing and self-fertilization, the polymorphism of phosphoglucomutase (PGM) and
glucose phosphate isomerase (GPI) was analyzed by electrophoresis of the adductor muscle of scallops
from São Francisco (26° 20.583S; 48° 16.507W) and Bom Abrigo (25° 28.735S; 47° 37.621W) beds;
the southern and northern extremes of the scallop fishing ground, respectively. Animals from São
Francisco showed a strong deficiency of heterozygosity for GPI and PGM. In addition, PGM showed
*exclusive alleles for each bed. Such results coupled with other information about the species
suggested the following hypothesis: a) the stock was a metapopulation with at least two populations; b)
some reproductive isolation might be occurring which might be influenced by conditions of larval
transport and by the extremely low densities of scallops; c) presently, the stock seemed to be mostly
maintained through self-fertilization; d) São Francisco could constitute a source-area, contributing with
larvae and recruits to Bom Abrigo and other areas; e) both beds were suffering a genetic
homogenization more evident in São Francisco. Such hypothesis needed to be investigated in order to
furnish guidelines for future programs of recovery and management of the resource.
Description
Keywords
Genetic variability Stock depletion Scallop Euvolaziczac Brazil
Citation
Publisher
Instituto de Tecnologia do Paraná