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| Tecchio, Samuele; Rius, Antonio; Dauvin, Jean-claude; Lobry, Jeremy; Lassalle, Geraldine; Morin, Jocelyne; Bacq, Nicolas; Cachera, Marie; Chaalali, Aurelie; Villanueva, Ching-maria; Niquil, Nathalie. |
| Ecological network analysis was applied in the Seine estuary ecosystem, northern France, integrating ecological data from the years 1996 to 2002. The Ecopath with Ecosim (EwE) approach was used to model the trophic flows in 6 spatial compartments leading to 6 distinct EwE models: the navigation channel and the two channel flanks in the estuary proper, and 3 marine habitats in the eastern Seine Bay. Each model included 12 consumer groups, 2 primary producers, and one detritus group. Ecological network analysis was performed, including a set of indices, keystoneness, and trophic spectrum analysis to describe the contribution of the 6 habitats to the Seine estuary ecosystem functioning. Results showed that the two habitats with a functioning most related to a... |
| Tipo: Text |
Palavras-chave: Trophic network; Estuary; Ecological network analysis; Ecopath with Ecosim; Food web; Ecosystem health indicators. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00270/38154/42026.pdf |
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| Lassalle, Geraldine; Pasqual, Jean-sebastien Nelva; Boet, Philippe; Rochet, Marie-joelle; Trenkel, Verena; Niquil, Nathalie. |
| To develop and implement ecosystem-based management, it is critical to monitor foodweb components or functional groups which are robust to uncertainty in ecosystem structure and functioning yet sensitive to changes. To select such functional groups for the Bay of Biscay continental shelf, both quantitative and qualitative foodweb models were developed. First, functional groups for which predictions of directions of change following an increase in primary productivity, prey or predators, or in fishing activities were identical across alternative qualitative model structures were identified. Second, the robustness to model type was assessed by comparing qualitative predictions with quantitative Ecopath model results. The demersal fish community was... |
| Tipo: Text |
Palavras-chave: Comparative studies; Ecosystem management; Foodweb; Loop analysis; Northeast Atlantic continental shelf. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00173/28427/26852.pdf |
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| Lassalle, Geraldine; Gascuel, Didier; Le Loch, Francois; Lobry, Jeremy; Pierce, Graham John; Ridoux, Vincent; Santos, Maria Begona; Spitz, Jerome; Niquil, Nathalie. |
| A number of marine mammal populations is currently threatened by their interactions with fisheries. The present study aimed to provide insights into the severity of potential impacts of operational and biological interactions between top predators and fisheries, in the Bay of Biscay region. Our approach was to modify an Ecopath with Ecosim (EwE) model describing the overall structure and function of the ecosystem by including landings and discards of exploited stocks and estimations of the bycatch of non-target compartments. Second, a set of ecological indices and a trophic level (TL)-based model (EcoTroph, ET) were derived from the EwE model. ET was used to simulate the effects of increasing fishing pressure on the ecosystem and, more particularly, on top... |
| Tipo: Text |
Palavras-chave: Ecopath; Ecosystem modelling; EcoTroph; Fisheries impacts; Marine mammals; Trophic level. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00087/19855/17541.pdf |
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| Raoux, Aurore; Tecchio, Samuele; Pezy, Jean-philippe; Lassalle, Geraldine; Degraer, Steven; Wilhelmsson, Dan; Cachera, Marie; Ernande, Bruno; Le Guen, Camille; Haraldsson, Matilda; Grangere, Karine; Le Loc'H, Francois; Dauvin, Jean-claude; Niquil, Nathalie. |
| As part of the energy transition, the French government is planning the construction of three offshore wind farms in Normandy (Bay of Seine and eastern part of the English Channel, north-western France) in the next years. These offshore wind farms will be integrated into an ecosystem already facing multiple anthropogenic disturbances such as maritime transport, fisheries, oyster and mussel farming, and sediment dredging. Currently no integrated, ecosystem-based study on the effects of the construction and exploitation of offshore wind farms exists, where biological approaches generally focused on the conservation of some valuable species or groups of species. Complementary trophic web modelling tools were applied to the Bay of Seine ecosystem (to the 50... |
| Tipo: Text |
Palavras-chave: Marine renewable energies; Reef effect; Wind farm; Ecopath with Ecosim; Ecosystem-based approach. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00347/45843/46723.pdf |
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| Tecchio, Samuele; Chaalali, Aurelie; Raoux, Aurore; Rius, Armonie Tous; Lequesne, Justine; Girardin, Valerie; Lassalle, Geraldine; Cachera, Marie; Riou, Philippe; Lobry, Jeremy; Dauvin, Jean-claude; Niquil, Nathalie. |
| During 2002–2005, a new container terminal in the commercial harbour of Le Havre, named “Port2000”, was built on the northern flank of the Seine estuary, northern France. This extension is already known to have modified the estuary current and sediment dynamics, as well as reducing biomass of the suprabenthos assemblage, for the whole downstream part of the system. However, studies on other biotic communities were largely inconclusive, and an ecosystem-wide analysis was still lacking. Here, we performed a before/after study of ecosystem dynamics of the different habitats of the Seine estuary, using a Linear Inverse Modelling technique (LIM-MCMC) to estimate all flows occurring in the food web. Ecological Network Analysis indices were calculated,... |
| Tipo: Text |
Palavras-chave: Linear inverse model; Estuarine ecosystem; Seine estuary; English Channel. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00288/39916/44274.pdf |
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