Modeling transport and retention of Engraulis anchoita Hubbs & Marini, 1935 (Clupeiformes, Engraulidae) early life stages along the Central Southwestern Atlantic Continental Shelf
Recruitment of pelagic fish is the result of a group of processes that affect their entire life cycle. Most of the variability in pelagic fish natural mortality is thought to occur during the early life stages of development, and to be related to environmental factors. The central Southwestern Atlan...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande (FURG) |
| Repositorio: | Repositório Institucional da FURG (RI FURG) |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.furg.br:1/2018 |
| Acceso en línea: | http://repositorio.furg.br/handle/1/2018 |
| Access Level: | acceso abierto |
| Palabra clave: | Anchoita Retention and transport of fish eggs and larvae Individual based model Southwestern Atlantic Continental Shelf Anchoíta Retenção e transporte de ovos e larvas de peixes Modelo baseado no indivíduo Plataforma continental do Atlântico Sudoeste |
| Sumario: | Recruitment of pelagic fish is the result of a group of processes that affect their entire life cycle. Most of the variability in pelagic fish natural mortality is thought to occur during the early life stages of development, and to be related to environmental factors. The central Southwestern Atlantic Continental Shelf is one of the most productive fishing sites in the western South Atlantic, but the processes involving the circulation in this area and its influence on eggs and larvae transport and retention are still poorly understood. The use of coupled physical-biological models to investigate fish early life history is relatively common. This work presents results of such a model applied to anchoita(Engraulis anchoita). The model is alternatively coupled to two surface velocity fields: the Ekman surface velocities computed from wind stress data, and the output of a three dimensional hydrodynamic numerical model. It is used to compute larval retention over the shelf. The results show that taking into account only Ekman velocities does not explain the seasonal and spatial spawning patterns observed in the region. Retention values with the experiments forced with output of the hydrodynamical model better match the observations. Our results suggest that the density driven circulation, induced by freshwater discharges of the Patos Lagoon and the la Plata River, and intrusions produced by the variability of the boundary currents (Brazil and Malvinas Currents) are efficient mechanisms of larval retention, especially due to the formation of recirculation cells that trap the organisms in coastal areas. |
|---|