Consulta: creatorFacets:"Chaalali, Aurelie"
Registros recuperados: 6
Data/hora: 03/06/2024 01:14:35

Cumulative effects of marine renewable energy and climate change on ecosystem properties: Sensitivity of ecological network analysis
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Nogues, Quentin; Raoux, Aurore; Araignous, Emma; Chaalali, Aurelie; Hattab, Tarek; Leroy, Boris; Ben Rais Lasram, Frida; David, Valérie; Le Loch, Francois; Dauvin, Jean-claude; Niquil, Nathalie.
In an increasingly anthropogenic world, the scientific community and managers have to take interactions between the drivers of ecosystems into consideration. Tools like ecological network analysis (ENA) indices offer the opportunity to study those interactions at the ecosystem level. However, ENA indices have never been used to test the incidence of cumulative drivers. The present study uses models combining the effects of (i) the reef caused by the future offshore wind farm of Courseulles-sur-Mer and (ii) climate change on species distribution, to test the response of multiple ENA indices. ENA indices proved sensitive to this cumulative impact, displaying a wide variety of cumulative effects. They were also very powerful to characterize the role of the...
Tipo: Text
Palavras-chave: Cumulative impact; Linear inverse modeling; Marine renewable energies; Ecological network analysis; ENA food web.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00658/77012/78274.pdf

Evaluating ecosystem-level anthropogenic impacts in a stressed transitional environment: The case of the Seine estuary
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Plankton food-web functioning in anthropogenically impacted coastal waters (SW Mediterranean Sea): an ecological network analysis
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Meddeb, Marouan; Grami, Boutheina; Chaalali, Aurelie; Haraldsson, Matilda; Niquil, Nathalie; Pringault, Olivier; Hlaili, Asma Sakka.
The study is the first attempt to (i) model spring food webs in three SW Mediterranean ecosystems which are under different anthropogenic pressures and (ii) to project the consequence of this stress on their function. Linear inverse models were built using the Monte Carlo method coupled with Markov Chains to characterize the food-web status of the Lagoon, the Channel (inshore waters under high eutrophication and chemical contamination) and the Bay of Bizerte (offshore waters under less anthropogenic pressure). Ecological network analysis was used for the description of structural and functional properties of each food web and for inter-ecosystem comparisons. Our results showed that more carbon was produced by phytoplankton in the inshore waters (966–1234...
Tipo: Text
Palavras-chave: Food-web modelling; Ecological network analysis; Mediterranean coastal waters; Plankton ecology.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00427/53813/54782.pdf

Abrupt shifts in the Gironde fish community: an indicator of ecological changes in an estuarine ecosystem
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Chevillot, Xavier; Pierre, Maud; Rigaud, Arthur; Drouineau, Hilaire; Chaalali, Aurelie; Sautour, Benoit; Lobry, Jeremy.
For decades, global climate change has directly and indirectly affected the structure and function of ecosystems. Abrupt changes in biodiversity have been observed in response to linear or sudden modifications to the environment. These abrupt shifts can cause long-term reorganizations within ecosystems, with communities exhibiting new functional responses to environmental factors. Over the last 3 decades, the Gironde estuary in southwest France has experienced 2 abrupt shifts in both the physical and chemical environments and the pelagic community. Rather than describing these shifts and their origins, we focused on the 3 inter-shift periods, describing the structure of the fish community and its relationship with the environment during these periods. We...
Tipo: Text
Palavras-chave: Ecosystem state; Fish diversity; Estuary; Generalised linear mixed models; GLMM; Time series; Shift; Inter-shift periods.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00334/44567/44282.pdf

Functional roles of an engineer species for coastal benthic invertebrates and demersal fish
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Chaalali, Aurelie; Brind'Amour, Anik; Dubois, Stanislas; Le Bris, Herve.
Through their tissues or activities, engineer species create, modify, or maintain habitats and alter the distribution and abundance of many plants and animals. This study investigates key ecological functions performed by an engineer species that colonizes coastal ecosystems. The gregarious tubiculous amphipod Haploops nirae is used as a biological model. According to previous studies, the habitat engineered by H.nirae (i.e., Haploops habitat) could provide food and natural shelter for several benthic species such as benthic diatoms belonging to the gender Navicula, the micrograzer Geitodoris planata, or the bivalve Polititapes virgineus. Using data from scientific surveys conducted in two bays, this study explored whether (1) the Haploops sandy-mud...
Tipo: Text
Palavras-chave: Coastal nurseries; Fish community; Haploops nirae; Isotopic diversity indices; Stable isotopes.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00396/50722/51431.pdf

The mosaic of habitats of the Seine estuary: Insights from food-web modelling and network analysis
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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