Absence of spatial genetic structure in common dentex (Dentex dentex Linnaeus, 1758) in the Mediterranean Sea as evidenced by nuclear and mitochondrial molecular markers

The common dentex, Dentex dentex, is a fish species which inhabits marine environments in the Mediterranean and Northeast Atlantic regions. This is an important species from an ecological, economic and conservation perspective, however critical information on its population genetic structure is lacking. Most samples were obtained from the Mediterranean Sea (17 sites) with an emphasis around Corsica (5 sites), plus one Atlantic Ocean site. This provided an opportunity to examine genetic structuring at local and broader scales to provide science based data for the management of fishing stocks in the region. Two mitochondrial regions were examined (D-loop and C01) along with eight microsatellite loci. The COI data was combined with publicly available sequences and demonstrated past misidentification of common dentex. All markers indicated the absence of population genetic structure from the Bay of Biscay to the eastern Mediterranean Sea. Bayesian approaches, as well as the statistical tests performed on the allelic frequencies from microsatellite loci, indicated low differentiation between samples; there was only a slight (p = 0.05) indication of isolation by distance. Common dentex is a marine fish species with a unique panmictic population in the Mediterranean and likely in the Atlantic Ocean as well

A system dynamics model for the management of the Manila clam, Ruditapes philippinarum (Adams & Reeve, 1850) in the Bay of Arcachon (France)

The Manila clam Ruditapes philippinarum (Adams and Reeve, 1850) is one of the mollusc species that, driven mainly by the shellfish market industry, has extended throughout the world, far beyond the limits of its original habitat. The Manila clam was introduced into France for aquaculture purposes, between 1972 and 1975. In France, this venerid culture became increasingly widespread and, since 1988, this species has colonised most of the embayments along the French Atlantic coast. In 2004, this development resulted in a fishery of ca. 520 t in Arcachon Bay

Data filtering to identify reference fleets to account for abundance of fish species: strengths and weaknesses through three applications- Striped red mullet (Mullus surmulletus), Whiting (Merlangius merlangus) and Pollack (Pollachius pollachius) of the Bay of Biscay

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Nouveau cadre analytique pour saisir la transformation des relations entre la science et la politique : la gestion européenne participative du littoral et du milieu marin

International audienceIn European coastal zone management, the ‘Ecosystem Approach’ has become a central governing principle potentially fostering new forms of participatory management. But, how can interdisciplinary research rigorously grasp changing configurations of stakeholders and science/knowledge which this invites - especially when complex debates on climate change additionally demand new forms of science/knowledge and new governing approaches? The interdisciplinary project ECOGOV (LabEx COTE, University of Bordeaux) proposes a new integrated inter-disciplinary framework to grasp these transforming science-politics ‘coupling practices’. The framework emerges from a ‘state of the art’ review of natural and political science theories: i) on relations between scientists, user knowledge holders and policy makers; ii) on ecosystem based management and stakeholder participation; iii) on climate change challenges for science and policy. The framework identifies four sets of dynamic ‘coupling practice’: i) acquisition, ii) aggregation, iii) articulation, iv) accumulation. More specifically to define coastal zone problems, science/knowledge must be acquired. Studying acquisition (i) enables research to identify which scientific/knowledge sources are perceived as ‘authoritative’, and why. Once different sciences/knowledges (e.g., ecological, economic, societal) are acquired, they must be aggregated. Studying aggregation (ii) reveals how compromises are reached over coastal zone futures and why some sciences/knowledges ‘win out’ when setting instruments. How actors legitimise choices made and communicate these in public arena can be grasped through studying articulation (iii). Coastal futures and coupling practices are accumulated over time. Studying accumulation (iv) reveals their broader consequences both for science/knowledge and participatory management. This framework will be applied to cases where participatory management takes place (ie, setting up of a marine park or implementation of the EU marine strategy directive). The poster will illustrate the originality of this framework for grasping iterative participatory management

Heavy metals and organochlorinated compounds in the European eel (Anguilla anguilla) from the Adour estuary and associated wetlands (France)

cited By 11International audienceHeavy metals and organic pollutants were investigated in the Adour estuary (South West France) and associated wetlands using the European eel (Anguilla anguilla) as a bioindicator. Heavy metals (Cu, Cd, Zn, Pb, and Ag) were measured in soft tissue of yellow eels. Mercury (total Hg and MeHg) and organochlorinated compounds (7 PCBs, 11 OCPs) were analysed in muscle. Concentrations in muscle were in agreement with moderately contaminated environments in Europe and were below the norms fixed for eel consumption for heavy metals and OCPs. Analyses of liver showed a higher pressure of Ag and Zn in the downstream estuary than in the freshwater sites whereas Cd was lower in the estuary probably because of the salinity influence. According to quality classes 100% of eels from freshwater sites indicated clean or slightly polluted environments. However, total mercury concentrations were close to the thresholds fixed by the European Community in the downstream estuary, whereas the sum of PCBs was found to be greatly above the fixed value. 100% of the individuals from the estuary were classified in quality classes corresponding to polluted or highly polluted sites. These first results highlight the need of further investigations focused on mercury and PCBs in this area taking the seasonal temperature influence into account for a better understanding of the pollution distribution and the possible threat on the eel population from the Adour basin

How Does MMEY Mitigate the Bioeconomic Effects of Climate Change for Mixed Fisheries

International audienceThis paper examines the impact of climate change on the bio-economic performance of Bay of Biscay mixed fisheries and explores the capacity of alternative management strategies to cope with these impacts. A dynamic multi-species, multi-class, multi-fleet model is developed and calibrated using available biological, economic and environmental information for French fleets. Fishing and economic data have been collected within the European Data Collection Framework. Climate represented by the sea surface temperature is assumed to affect species recruitment. Three management strategies are compared in terms of bio-economic outcomes: the Status-Quo (SQ), a Multi-species Maximum Sustainable Yield (MMSY) strategy and a Multi-species Maximum Economic Yield (MMEY) strategy. These strategies are ranked with respect to two contrasted scenarios regarding the Representative Concentration Pathways (RCP) driving climate change. Results show that the SQ strategy is not sustainable and is characterized by a major decline of the key commercial species. By contrast, the MMSY strategy improves the ecological state and economic performance of the fishery. The MMEY strategy yields even greater bio-economic improvements. Bio-economic benefits are however altered by the effects of climate change. Under the MMEY strategy, fleets with more diversified catch structures perform better facing climate change