Genetic diversity of two Portuguese populations of the pullet carpet shell Venerupis senegalensis, based on RAPD markers: contribution to a sustainable restocking program |
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Authors: | Sandra Joaquim Jorge Pereira Alexandra Leitão Domitília Matias Raquel Chaves Henrique Guedes-Pinto Luís Chícharo Miguel Gaspar |
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Institution: | 1. Instituto Nacional de Recursos Biológicos (INRB, I.P.)/IPIMAR, Av. 5 de Outubro s/n, 8700-305, Olh?o, Portugal 2. Centro de Genética e Biotecnologia (CGB), Instituto de Biotecnologia e Bioengenharia (IBB), Universidade de Trás-os-Montes e Alto Douro, 5000-911, Vila Real, Portugal 3. Centro de Ciências do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139, Faro, Portugal
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Abstract: | The pullet carpet shell Venerupis senegalensis (=V. pullastra) is a commercially important species in Portugal, Spain, France, and Italy. In Portugal, this species was once abundant in
the Ria Formosa (southern Portugal). However, in the early 1980s, its abundance declined dramatically due to overfishing.
In order to reverse this negative trend, the genetic sustainable management of the wild stocks of V. senegalensis should be performed by promoting successful restocking actions and the development of an aquaculture commercial production
program of this species. In order to find the best broodstock for aquaculture purposes and therefore minimize the deleterious
effects of hatchery practices, we analyzed the genetic diversity of the natural population to be restocked (Ria Formosa) but
also of another potential genetically close population (Ria de Aveiro) by RAPD. Similar and substantive percentage of polymorphic
loci, effective number of alleles, Nei’s gene diversity, and Shannon’s diversity index was found within both populations. This
high genetic variability within populations suggests that they might have a gene pool with sufficient genetic plasticity to
support changes in the environmental conditions. Analyses of population genetic structure also revealed a small genetic differentiation
between the two populations. The high genetic variability of the natural population to be restocked makes it the preferential
broodstock for aquaculture purposes. However, the Ria de Aveiro population could also be a viable alternative, due to its
genetic plasticity and the genetic similarity of both populations. The results of this study can be useful to the sustainable
management of wild stocks as well as in promoting successful restocking actions based on aquaculture production. |
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