AN ANALYSIS OF THE TROPHIC NETWORK OF A MACROTIDAL ESTUARY: THE SEINE ESTUARY (EASTERN CHANNEL, NORMANDY, FRANCE)
(dossier articles) An analysis of the trophic network of a macrotidal estuary: the Seine estuary (eastern channel, Normandy, France) 1. Introduction 2. Study area 3. Material and methods 3.1. Description of network analysis and ecopath methods 3.2. Trophic compartments 4. Results 5. Discussion 5.1. Trophic groups and detritus compartment 5.2. Origin of energy flows 5.3. […]
DEALING WITH UNCERTAINTY IN QUALITIVE MODELS WITH A SEMI-QUANTITATIVE APPROACH BASED ON SIMULATIONS – APPLICATIONS TO THE GIRONDE ESTUARINE FOOD WEB
(dossier articles) Dealing with uncertainty in qualitive models with a semi-quantitative approach based on simulations – Applications to the Gironde estuarine food web 1. Introduction 2. Materials and methods 2.1. Two commonly used matrices inversion methods 2.2. A new method applied to the Gironde estuary 2.3. Validation of the new community matrix 2.4. Development of […]
DIVERSITY AND STABILITY OF AN ESTUARINE TROPHIC NETWORK
(dossier articles) Diversity and stability of an estuarine trophic network Introduction Materials and methods Results – Adequacy of the data and balancing procedure – Basic estimates, graphical representations and trophic interactions – System characteristics Discussion – Topological patterns in the Gironde estuarine trophic network – Maturity and stability of the system – Seasonal patterns – […]
A METHOD FOR IDENTIFYING KEYSTONE SPECIES IN FOOD WEB MODELS
(dossier articles) A method for identifying keystone species in food web models 1. Introduction 2. Methods 2.1. Ecopath approach 2.2. Mixed trophic impact 2.3. Ecosim 2.4. Comparison between simulation outputs and matrix M 2.5. Estimating total impact 2.6. Identifying an index of keystoneness 3. Results 4. Discussion 5. Conclusion Acknowledgements References
A REVIEW OF EXISTING FISH ASSEMBLAGE INDICATORS AND METHODOLOGIES
(dossier articles) A review of existing fish assemblage indicators and methodologies Introduction Reviewing existing fish-based methods – Historical background: the original IBI – Defining a theoretical fish assemblage: « type-specific » vs « site-specific » approaches – An empirical approach based on fish assemblage conditions – Explicit approach based on environmmental evaluation – Using historical data instead of minimally […]
BIODEGRADABILITE DE LA MATIERE ORGANIQUE DANS LE BOUCHON VASEUX ET LE CREME DE VASE DE L’ESTUAIRE DE LA LOIRE
Biodégradabilité de la matière organique dans le bouchon vaseux et le crème de vase de l’estuaire de la Loire Introduction Matériel et méthodes – Cadre des campagnes de septembre 1990 et 1991 – Prélèvements et filtration – Analyses des paramètres physico-chimiques, carbone et azote organique, sels nutritifs, chlorophylle a et phéopigments – Méthodes analytiques – […]
TRACKING THE TURBIDITY MAXIMUM ZONE IN THE LOIRE ESTUARY BASED ON A LONG-TERM, HIGH-RESOLUTION AND HIGH-FREQUENCY MONITORING NETWORK
(dossier articles) Tracking the turbidity maximum zone in the Loire estuary based on a long-term, high-resolution and high-frequency monitoring network 1. Introdution 2. Material and methods 3. Results 3.1. Hydrological conditions between 2007 and 2014 3.2. Intratidal variation of turbidity 3.3. Subtidal variation of turbidity 4. Discussion 4.1. Upstream migration and downstream flushing of the […]
TURBIDITY IN THE FLUVIAL GIRONDE ESTUARY BASED ON 10-YEAR CONTINUOUS MONITORING: SENSITIVITY TO HYDROLOGICAL CONDITIONS
(dossier articles) Turbidity in the fluvial Gironde estuary based on 10-year continuous monitoring: sensitivity to hydrological conditions 1. Introduction 2. The study site 3. Materials and methods 3.1. The multiyear high-frequency monitoring system 3.2. Data treatment 4. Results 4.1. Hydrological trends 4.2. Short-term variability in turbidity 4.3. Long-term variability in turbidity 5. Discussion 5.1. Mobile […]
TRANSFERT JUSQU’A L’ESTUAIRE DES RADIONUCLEIDES REJETES PAS LES CNPE DU BASSIN DE LA LOIRE
(dossier articles) Transfert jusqu’à l’estuaire des radionucléides rejetés pas les CNPE du bassin de la Loire 1. Introduction 2. Transfert des radionucléides en Loire fluviale 2.1. Le modèle CRESCENDO 2.2. La modélisation hydraulique et le transport des substances dissoutes 2.3. La modélisation sédimentaire et le transport des substances associées aux particules 2.4. Évaluation de la […]
VARIFLUX – TRANSPORTS FLUVIAUX DISSOUS ET PARTICULAIRES A FINE RESOLUTION TEMPORELLE / METHODES ET INCERTITUDES
(dossier articles) Variflux – Transports fluviaux dissous et particulaires à fine résolution temporelle – Méthodes et incertitudes 1. Introduction 2. Matériel et méthodes 3. Résultats et discussions – Action 1 : Caractérisation de la variabilité des C et des flux à fine résolution temporelle et prédiction des incertitudes liées à la fréquence de surveillance et […]