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Communication Dans Un Congrès Année : 2018

Larval fish swimming behavior alters dispersal patterns from marine protected areas in the North-Western Mediterranean Sea

Résumé

Most demersal fishes undergo a dispersal phase as larvae, which strongly influences the connectivity among adult populations and, consequently, their genetic structure and replenishment opportunities. Because this phase is difficult to observe directly, it is frequently simulated through numerical models, most of which consider larvae as passive or only vertically migrating. However, in several locations, including the Mediterranean Sea, several larval fish species have been shown to swim fast and orient. Here we use a Lagrangian model to study connectivity patterns among three Mediterranean Marine Protected Areas (MPAs) and compare simulations in which virtual larvae are passive to simulations in which oriented swimming is implemented. The parameterization of behavior is based on empirical data for two groups of species of the economically and ecologically important family Sparidae: species with small larvae (i.e., 9-11 mm), displaying a maximum swimming speed of 6 cm s−1 and a pelagic larval duration of 13-19 days (e.g., Diplodus annularis L., Oblada melanura L.) and species with large larvae (i.e., 14-16 cm), displaying a maximum swimming speed of 10cm s−1 and a PLD of 28-38 days (e.g., Spondyliosoma cantharus L.). Including larval behavior in the model (i) increased the overall proportion of successful settlers, (ii) enhanced self-recruitment within the MPAs, but also (iii) increased the intensity, and (iv) widened the export of eggs and larvae (recruitment subsidy) from the MPAs; overall, it significantly changed connectivity patterns. These results highlight the need to gather the observational data that are required to correctly parameterize connectivity models and efficiently manage marine resources.
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Dates et versions

hal-04026420 , version 1 (13-03-2023)

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  • HAL Id : hal-04026420 , version 1

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Robin Faillettaz, Claire B. Paris, Jean-Olivier Irisson. Larval fish swimming behavior alters dispersal patterns from marine protected areas in the North-Western Mediterranean Sea. Larval Fish Conference, 2018, Victoria, British Columbia, Canada. ⟨hal-04026420⟩
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