Consulta: subjectFacets:"Estuarine ecosystem"
Registros recuperados: 5
Data/hora: 01/06/2024 03:32:05

Relations entre la nourriture disponible et la reproduction de mollusques en milieu estuarien : variabilité temporelle de la colonne d'eau
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc; Prou, Jean; Razet, Daniel.
The study of the trophic relations needs to collect data which can best represent the variability of the populations of molluscan and the parameters of the water. For the water, the main parameters which play a role on the production of molluscan in an estuarine area are the temperature, the seston, and the phytoplanctonic biomass. For the temperature is proposed to sample only twice a month. At the contrary for seston variations which are very large on a tidal cycle and correlated with the currents and the waves, it is necessary to take in count this variability. For the phytoplancton, the annual cycle is well characterized, but the variability at a station is depending on the caracteristic of each water masses. The authors suggest that a sampling...
Tipo: Text
Palavras-chave: Estuarine ecosystem; Trophic relationships; Time variations; Sampling strategies; Ecosystème estuarien; Relations trophiques; Variabilité temporelle; Stratégie d'échantillonnage.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-2868.pdf

Evaluating ecosystem-level anthropogenic impacts in a stressed transitional environment: The case of the Seine estuary
Provedor de dados: 5
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

Impact of the sampling protocol in assessing ecological trends in an estuarine ecosystem: The empirical example of the Gironde estuary
Provedor de dados: 5
Autores: Pasquaud, Stephanie; Brind'Amour, Anik; Berthele, Olivier; Girardin, Michel; Elie, Pierre; Boet, Philippe; Lepage, Mario.
In view of the European Union (EU) requirements to diagnose and monitor the ecological status of estuarine ecosystems using fish-based indicators, we assessed the effect of the sampling protocol in meeting these objectives. Using three different sampling surveys, we evaluated the impact of four components, i.e. sampling gear, spatial extent, length of time series and temporal window analysed, on the detection of ecological trends in the Gironde estuary, estimated by different types of fish-based indicator. For each component, temporal trends of several fish-based indicators were analysed and for the final diagnosis these temporal trends were combined. The results showed that sampling gear had significant effects on the assessment of ecological trends, as...
Tipo: Text
Palavras-chave: Protocol effects; Fishing gear; Ecological trend; Fish; Indicators; Estuarine ecosystem.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00049/15976/14533.pdf

Diversity and stability of an estuarine trophic network
Provedor de dados: 5
Autores: Lobry, Jeremy; David, V; Pasquaud, S; Lepage, M; Sautour, B; Rochard, E.
Estuarine areas provide highly valuable ecosystem benefits for human populations, despite being under intense demographic, economic and ecological pressures. Hence, an understanding of the structure and function of estuarine ecosystems is essential for understanding the persistence and stability of these ecosystems and their response to perturbations. This study synthesises available data and knowledge about the Gironde estuary (SW France) in a mass-balanced trophic model to illustrate potential key patterns in the functioning of the estuarine ecosystem and key elements of its stability. In order to evaluate the total direct and indirect impact on the whole community of the 2 main sources of anthropogenic perturbations in the estuarine area, mortalities...
Tipo: Text
Palavras-chave: Gironde estuary; Ecopath; Diversity; Stability; Network analysis; Food web; Estuarine ecosystem.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4290.pdf

Dynamique de la diversité fonctionnelle des communautés de poissons (lagune de Terminos, Mexique)
Provedor de dados: 5
Autores: Villeger, Sébastien.
One of the main challenges in ecology is to understand how global changes affect biodiversity and what are the consequences on ecosystem functioning. In this perspective, the functional diversity of communities is a cornerstone since it allows linking environment, community structure and ecosystem properties. The aim of this thesis is thus to improve the understanding of functional diversity dynamic (i) in relation to natural variability of environmental conditions and (ii) under anthropogenic disturbances. As a first step we have developed a new methodological framework allowing to (1) describe fish functional niches based on functional traits, and (2) to quantify functional diversity within (&amp;#945;) and among (&amp;#946;) sites thanks to new indices....
Tipo: Text
Palavras-chave: Gulf of Mexico; Nekton; Teleostian; Global changes; Environmental gradient; Estuarine ecosystem; Functional diversity indices; Functional traits; Golfe du Mexique; Necton; Téléostéens; Changements globaux; Gradient environnemental; Écosystème estuarien; Indices de diversité fonctionnelle; Traits fonctionnels.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-6178.pdf