An ecotrophic model of southern Brazil continental shelf and fisheries scenarios for Engraulis anchoita (Pisces, Engraulididae)

Submitted by Eliane Silva (eliane_sun@hotmail.com) on 2015-12-14T18:45:55Z No. of bitstreams: 1 An ecotrophic model of southern Brazil continental shelf and fisheries scenarios for Engraulis anchoita (Pisces, Engraulididae).pdf: 206285 bytes, checksum: f44b2cd6fdc5ef2aa3c835fc2737d435 (MD5)Approved for entry into archive by Lilian M. Silva (lilianmadeirasilva@hotmail.com) on 2015-12-14T23:54:30Z (GMT) No. of bitstreams: 1 An ecotrophic model of southern Brazil continental shelf and fisheries scenarios for Engraulis anchoita (Pisces, Engraulididae).pdf: 206285 bytes, checksum: f44b2cd6fdc5ef2aa3c835fc2737d435 (MD5)Made available in DSpace on 2015-12-14T23:54:30Z (GMT). No. of bitstreams: 1 An ecotrophic model of southern Brazil continental shelf and fisheries scenarios for Engraulis anchoita (Pisces, Engraulididae).pdf: 206285 bytes, checksum: f44b2cd6fdc5ef2aa3c835fc2737d435 (MD5) Previous issue date: 2005Os modelos ecotróficos de balanço de biomassa vem sendo utilizados cada vez mais como ferramentas para melhorar o entendimento da estrutura e funcionamento dos ecossistemas afetados pela pesca. Neste sentido foi construído um modelo preliminar, para entender a estrutura e os processos da plataforma continental do Sul do Brasil. Foram incluídos apenas os principais grupos para poder observar a importância relativa de cada um deles, testar cenários de exploração pesqueira e assim avaliar as possíveis consequências da pressão pesqueira sobre um recurso ou grupo em particular e o tipo de detalhamento que deverão ter os modelos futuros. Um exercício de simulação mostrou que a eventual pressão pesqueira sobre o pequeno peixe pelágico anchoíta (Engraulis anchoita) poderia também ter efeitos negativos na biomassa de seus predadores, mas favoreceria outros grupos de peixes competidores e camarões também explorados.Ecotrophic models are becoming a useful tool to understand the structure and dynamics of aquatic ecosystems affected by fisheries. In the present paper a preliminary Ecopath model was built to allow the understanding of the structure and biomass dynamics of the Rio Grande do Sul (Brazilian southernmost state) continental shelf ecosystem. Only the main groups were included to analyse their relative importance and to test some fisheries scenarios in order to observe the consequences of fishing pressure over one particular group and the detail requirements for future models. A fishing scenario for the small pelagic anchoita (Engraulis anchoita) using Ecosim, showed that this fishery would have negative impacts on the biomass of its predators and positive impacts on the competitor fish groups also exploited and on shrimps