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Communication Dans Un Congrès Année : 2019

Connectivity assessment within the Gulf of Lion artificial and natural reef networks using biophysical modelling

Résumé

The EU Maritime spatial planning directive was adopted in 2014 in order to provide EU Member states a legal framework to regulate Blue Growth (development of economical activites in the ocean). In essence, this directive impulses a geographical approach to marine activities, expliciting the requirement for coordinating them spatially by sharing them among States members and gathering all knowledge available. Particular emphasis is given to the possibility to anticipate impacts on natural ecosystem functionning and interactions at basin scale. The present work was undergone to assess the added connectivity to natural hard substrates populations associated to the artificial reefs that were deployed in the Gulf of Lions in the last 40 years in order to help decision making for planning of artificial reefs removal or new deployment. Larval transfer probabilities between and within natural and artificial reefs patches of 1km2 were estimated using larval dispersal biophysical modelling using a high resolution hydrodynamical model. Reproductive traits a priori differentiating species such as reproductive period in the year and planktonic larval duration were explored to establish specific variants of connectivity patterns. Graph metrics (z_score, betweeness centrality, bridging centrality, clustering coefficient) were used to rank natural and artificial patches importance in 3 different ecological networks (fully natural, fully artificial, hybrid natural-artificial). Results indicated that the artificial reefs of the center of the Gulf of Lion (from Aigues-Mortes to Port-La-Nouvelle) should be the most colonized whatever the reproductive period and when colonized, would act as source for the natural reefs. Patches displaying highest betweeness, bridging centrality and clustering coefficient were more than often found in the natural habitat. Besides, those patches were the same in the fully natural and hybrid natural-articifical networks, suggesting the current artificial network do not add a significant connectivity to the natural habitat network.
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Dates et versions

hal-03999742 , version 1 (21-02-2023)

Identifiants

  • HAL Id : hal-03999742 , version 1

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Katell Guizien, Skandar Hentati, Thibaud Tournadre, Sylvain Blouet. Connectivity assessment within the Gulf of Lion artificial and natural reef networks using biophysical modelling. iMARCO International Conference, Sep 2019, Aveiro, Portugal. ⟨hal-03999742⟩
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