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ICES Journal of Marine Science: Journal du Conseil 2005 62(4):634-644; doi:10.1016/j.icesjms.2005.02.007
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© 2005 International Council for the Exploration of the Sea

Survival of sardine larvae off the Atlantic Portuguese coast: a preliminary numerical study

Aires J.P. Santosa,*, João Nogueirab,* and Helder Martinsa

a Department of Mechanical Engineering, Instituto Superior Técnico Av. Rovisco Pais, 1096 Lisboa Codex, Portugal
b Department of Natural and Biological Science, Universidade Lusófona de Humanidades e Tecnologias Campo Grande, Lisboa, Portugal

*Correspondence to A.J.P. Santos: tel: +351 21 841 79 86 fax: +351 21 841 73 98. e-mail: aires{at}popsrv.ist.utl.pt.

A bio-physical model of sardine larvae off the Atlantic Portuguese coast, incorporating a three-dimensional circulation model, was used to estimate changing biomass during winter upwelling and downwelling events. The growth rate of larvae was modelled as a function of age, temperature, and prey concentration and the mortality rate as a function of age and temperature. Numerical results indicate that upwelling events during the spawning season may have a negative impact on larval survival. Total larval biomass seems to be mainly controlled by larval prey relative to temperature. This preliminary study does not account for the dynamics of the food chain and therefore the intense biological activity associated with an upwelling event, as well as the influence of river plumes in retention mechanisms.

Keywords: biomass, downwelling, growth, larvae, mortality, upwelling

Received 11 June 2003; accepted 14 February 2005.


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