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Characteristics of the pelagic ecosystem of the French bay of Biscay submitted to the influence of the Gironde dilution plume were defined, in spring, taking into account the structure and magnitude of both microplanktonic stocks and dynamics
, the importance of trophic transfers, and the magnitude of carbon downward fluxes. Notwhithstanding the differences in both biomass and production rates measured during the three different spring periods, nano- and picoplanktonic cells were predominant

demersal species caught in both hauls. In the second haul, the vacuity percentage of the species studied (26%) diminishes with respect to the first one (39%), at the same time as the feeding intensity of some scavenger species increases: Trachinus draco

trophic levels and mixed trophic impact analysis considering the fishery both as an impacting and impacted component are included. Also, we explore the potential relevance of simulating the effect of different fishing regimes on the ecosystem flow

Spatial and temporal short-term variations of zooplankton populations were studied during oyster breeding in the most inner part of Arcachon bay. This environment is submitted both to oceanic (bay of Biscay) and continental (Leyre) inputs and its