A biophysical model of S. aurita early life history in the northern Gulf of Guinea
| Type | Article | ||||||||||||
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| Date | 2017-02 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Kone Vamara1, Lett Christophe2, Penven Pierrick3, Bourles Bernard4, Djakoure Sandrine5 | ||||||||||||
| Affiliation(s) | 1 : Ctr Rech Oceanol, 29 Rue Pecheurs,BPV 18, Abidjan, Cote Ivoire. 2 : UPMC Univ Paris 06, Sorbonne Univ, IRD, Unite Modelisat Math & Informat Syst Complexes UM, F-93143 Bondy, France. 3 : CNRS IFREMER IRD UBO, IFREMER, LOPS, UMR 6523, Plouzane, France. 4 : CNES CNRS IRD UPS, LEGOS, UMR 5566, Toulouse, France. 5 : Univ Felix Houphouet Boigny, Lab Phys Atmosphere & Mecan Fluides LAPA MF, Abidjan, Cote Ivoire. 6 : Stn Ifremer Sete, UMR MARBEC, Ave J Monnet, F-34203 Sete, France. |
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| Source | Progress In Oceanography (0079-6611) (Pergamon-elsevier Science Ltd), 2017-02 , Vol. 151 , P. 83-96 | ||||||||||||
| DOI | 10.1016/j.pocean.2016.10.008 | ||||||||||||
| WOS© Times Cited | 9 | ||||||||||||
| Keyword(s) | Hydrodynamic model, Individual-based model, S. aurita early life stage, Recruitment, Upwelling, Northern Gulf of Guinea | ||||||||||||
| Abstract | S. aurita is the most abundant small pelagic fish in the northern Gulf of Guinea. Its reproduction and recruitment depend crucially on environmental conditions. We developed a biophysical model of S. aurita early life history by coupling offline an individual-based model with the regional oceanic modeling system (ROMS). We used this model to investigate the main factors driving variability in eggs and larval dispersal and survival in the northern Gulf of Guinea. Precisely, individuals were released from different spawning areas along the coast and tracked for a period of 28 days corresponding to their planktonic phase. Individuals that remained in the coastal recruitment areas at an age more than 7 days, at which they can supposedly actively retain themselves in a favorable area, were considered as recruited. Simulation results show the importance of the spawning areas around Cape Palmas and Cape Three Points where cyclonic eddies trap eggs and larvae along the coast, preventing their advection offshore by the Guinea Current. The spawning period also plays a key role in the recruitment success, with highest coastal retention obtained during the major upwelling period (July to September). We find that a second retention peak can occur during the minor upwelling period (February to March) when larval mortality due to temperature is included in the model. These results are in general agreement with knowledge of S. aurita reproduction in the northern Gulf of Guinea. | ||||||||||||
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