Scientist, Ecology and Ecosystem Health research unit, Fisheries and Aquatic Ecology research group in Agrocampus OUes/Inrae Rennes
Ecology and Models applied to Fishery resources (EMH) research unit, French Research Institute for Exploitation of the Sea (Ifremer), Nantes
Trophic capacity and functioning of the Seine Estuary: the link with recruitment of nursery-dependent fish species
Current Research Topics
As a Ph.D. candidate, I am working with Hervé Le Bris (Ecology and Ecosystem Health Research Unit, Agrocampus Ouest, Rennes, France) and Anik Brind’Amour (Ecology and Models applied to Fishery resources research unit, French Research Institute for Exploitation of the Sea Ifremer, Nantes, France).
My Ph.D thesis focuses on understanding the relationship between the trophic capacity of the bay of Seine and the production of fish juveniles.
The Seine estuary went through important morphological modifications since the early 19th century and much of these modifications accelerated in the last 30 years. Some consequences had been characterized as loss of available space or significant siltation. However, the estuary and its bay play an essential role of nursery for many species and contribute to the renewal of several fish and shellfish stocks.
My thesis aims at understanding the mechanisms underlying the loss of nursery quality by investigating the limiting aspect of the trophic capacity (i.e. the available food production) on the juveniles’ production at different scales:
- Large temporal and spatial scales: inter annual estimation of the trophic capacity of the bay of Seine and other French nurseries and the link with fish recruitment. Does the trophic capacity limit the juveniles’ production? If yes, what are the drivers of this limitation and the consequences on fish recruitment?
- Fine temporal scale: estimation of the seasonal variability of the trophic capacity of the bay of Seine and its effect on juveniles’ growth and physical condition. Does the trophic limitation affect juveniles at the beginning of the growth season (May) or at the end (September/October)?
- Fine spatial scale: assessment of trophic structures and quantification of relative contribution of the different sectors to the diet of fish species. How do the different sectors of the estuary contribute to fish growth and thus to trophic limitation?