Identification of western South Atlantic stocks of the Lane snapper (Lutjanus synagris) from an otolith based multi-proxy approach

Autor(es)

Dos Santos, Jessica Borba Quintela ; Chiessi, Cristiano Mazur ; Crivellari, Stefano ; Filho, Jonas Eloi de Vasconcelos ; Pereira, Natan Silva ; Freitas, Matheus Oliveira ; Ferreira, Beatrice Padovani

• Tipo de documento: Artigo Científico
• Fonte: Fisheries Research; v. 253, p. 15-pg., 2022-09-01.

Resumo

Accurate stock assessments are the basis of adequate fisheries management. In the Southwest Atlantic, fisheries of the Lane snapper (Lutjanus synagris) have been growing in importance in the last decades, following declines in other snapper fisheries since the late 1970 s, with evidence of overexploitation accumulating since the mid-2000 s. Contrasting environmental conditions along the area are potential drivers of stock separation, yet no pheno-typic approach has ever been applied to the stock identification of the species in the area. Here we employ a multi-proxy approach based on otolith shape and isotopic composition to identify Lane snapper stocks in the Southwest Atlantic, and also investigate whether geographical limits of Large Marine Ecosystems and Marine Ecoregions are suitable surrogates for estimating stock boundaries, which could be useful for application in stock assessments when stock boundaries are unknown. The spatial heterogeneity evidenced by all proxies used supported the existence of distinct Lane snapper stocks, contrasting to previous genetic-based studies. Our results reveal a strong influence of environmental and oceanographic conditions as drivers of stock separation. The Marine Ecoregions system was considered a more appropriate surrogate for delineating stock boundaries, rep-resenting a fast and feasible approach to facilitate stock assessments in other data-limited fisheries. (AU)

• Processo FAPESP: 18/15123-4 - Perspectivas pretéritas sobre limiares críticos do sistema climático: a Floresta Amazônica e a célula de revolvimento meridional do Atlântico (PPTEAM)
• Beneficiário: Cristiano Mazur Chiessi
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores - Fase 2
• Processo FAPESP: 19/24349-9 - Avaliando os efeitos das mudanças climáticas do passado e do futuro na biodiversidade amazônica (CLAMBIO)
• Beneficiário: Cristiano Mazur Chiessi
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular