Anthropogenic river fragmentation reduces long-term viability of the migratory fish Salminus brasiliensis (Characiformes: Bryconidae) populations

Autor(es)

Ribolli, Josiane ^{[1, 2, 3]} ; Zaniboni-Filho, Evoy ^[2] ; Machado, Carolina Barros ^[3] ; de Souza Guerreiro, Tailise Carolina ^[3] ; de Freitas, Patricia Domingues ^[3] ; Galetti Jr, Pedro Manoel

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Programa Posgrad Ecol & Recursos Nat, Rodovia Washington Luis Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Santa Catarina, Dept Aquicultura, Lab Biol & Cult Peixes Agua Doce, Rodovia SC 406 Km 3, 3532, BR-88066260 Florianopolis, SC - Brazil

^[3] Univ Fed Sao Carlos, Dept Genet & Evolucao, Lab Biodiversidade Mol & Conservacao, Rodovia Washington Luis Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 19, n. 2 2021.
• Citações Web of Science: 0

Resumo

Life-history, geographical barriers, and damming can shape the genetic diversity of freshwater migratory fish, which are particularly vulnerable to anthropogenic impacts. We investigated the genetic diversity of Salminus brasiliensis, a long-distance migratory species that is recognized as an important provider of ecosystem services. We implemented microsatellite analyses to assess genetic diversity and simulate future scenarios for evaluating the long-term viability of dammed and non-dammed populations from the Uruguay River. High levels of genetic diversity were detected for all sampled populations. However, effective population sizes were lower in the uppermost river stretches, where the landscape is highly fragmented. Population structure analysis indicated two spatial genetic populations. It is suggested that this genetic structure preserves populations partially isolated by an ancient natural barrier, instead of being a result of the presence of dams. The simulated genetic scenarios indicated that genetic variability of S. brasiliensis populations from upstream dams could collapse over the years, mainly due to the reduction in the number of alleles. Therefore, besides helping to better understand issues related to the influence of dams on the genetic diversity of migratory fish, our results are especially relevant for driving local fishery policies and management actions for the species conservation. (AU)

• Processo FAPESP: 10/52315-7 - Predadores de topo de cadeia alimentar
• Beneficiário: Pedro Manoel Galetti Junior
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular