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Modeling the spawning strategies and larval survival of the Brazilian sardine (Sardinella brasiliensis)

TitleModeling the spawning strategies and larval survival of the Brazilian sardine (Sardinella brasiliensis)
Publication TypeJournal Article
Year of Publication2014
AuthorsDias, DFaggiani, Pezzi, LPonzi, Gherardi, DFrancisco, Camargo, R
JournalProgress in Oceanography
Volume123
Pagination38–53
ISSN0079-6611
Abstract

An Individual Based Model ({IBM}), coupled with a hydrodynamic model ({ROMS}), was used to investigate the spawning strategies and larval survival of the Brazilian Sardine in the South Brazil Bight ({SBB}). {ROMS} solutions were compared with satellite and field data to assess their representation of the physical environment. Two spawning experiments were performed for the summer along six years, coincident with ichthyoplankton survey cruises. In the first one, eggs were released in spawning habitats inferred from a spatial model. The second experiment simulated a random spawning to test the null hypothesis that there are no preferred spawning sites. Releasing eggs in the predefined spawning habitats increases larval survival, suggesting that the central-southern part of the {SBB} is more suitable for larvae development because of its thermodynamic characteristics. The Brazilian sardine is also capable of exploring suitable areas for spawning, according to the interannual variability of the {SBB}. The influence of water temperature, the presence of Cape Frio upwelling, and surface circulation on the spawning process was tested. The Cape Frio upwelling plays an important role in the modulation of Brazilian sardine spawning zones over {SBB} because of its lower than average water temperature. This has a direct influence on larval survival and on the interannual variability of the Brazilian sardine spawning process. The hydrodynamic condition is crucial in determining the central-southern part of {SBB} as the most suitable place for spawning because it enhances simulated coastal retention of larvae.

URLhttp://www.sciencedirect.com/science/article/pii/S0079661114000354
DOI10.1016/j.pocean.2014.03.009