Le processus de biodéposition

Table des matières

CHAPITRE 1  INTRODUCTION GÉNÉRALE 
1. 1 CONTEXTE DE L’ÉTUDE
1.2 INTERACTIONS CONCHyLICULTURE-ENVIRONNEMENT
1.2.1 L’environnement pélagique
1.2.2 Le processus de biodéposition
1.2.3 Effets de la biodéposition sur l’ environnement benthique
1.3 OBJECTIFS DE LA THÈSE
1.4 HYPOTHÈSES DE RECHERCHE
1.5 STRUCTURE DE LA THÈSE
1.6 SITE D’ÉTUDE : LA LAGUNE DE GRANDE-ENTRÉE
1.6.1 Caractéristiques physiques
1.6.2 Caractéristiques physico-chimiques et trophiques
1.6.3 L’environnement benthique
CHAPITRE 2 
Sedimentation rates in a suspended mussel farm (Great-Entry Lagoon, Canada): biodeposit production and dispersion 
2.1 INTRODUCTION
2.2 MATERIALS AND METHODS
2.2.1 Study site
2.2.2 Environmental conditions
2.2.3 Biodeposit production and quality
2.2.4 Biodeposit sinking velocities
2.2.5 Sedimentation rates
2.2.6 Statistical analyses
2.3 RESULTAS
2.3.1 Environmental conditions
2.3.2 Biodeposit production and quality
2.3.3 Biodeposit characteristics and sinking velocity
2.3.4 Field measures of sedimentation rates
2.3.5 Dispersion
2.4 DISCUSSION
2.4.1 Biodeposit production
2.4.2 Faecal pellet sinking velocity
2.4.3 Field measurements of sedimentation rates
2.4.4 Estimated dispersion of mus sel biodeposits
2.4.5 Ecological implications
CHAPITRE 3 
Multi-scale spatial variations in benthic sediment geochemistry and macrofaunal communities under a suspended mus sel culture 
3.1 INTRODUCTION
3.2 MATERIAL AND METHODS
3.2.1 Study site
3.2.2 Sampling design
3.2.3 Sedimentation rates
3.2.4 Sediment geochemical characteristics
3.2.5 Macrofaunal community analysis
3.2.6 Statistical analysis
3.2.7 Inter-annual comparison
3.3 RESULTS
3.3.1 Sediment geochemical characteristics
3.3.2 Benthic community
3.4 DISCUSSION
3.4.1 Sediment geochemical characteristics
3.4.2 Benthic community
3.4.3 Historical data
CHAPITRE 4 
Evaluation of indicators used to detect mussel farm influence on the benthos: two case studies in the Magdalen Islands, Eastern Canada 
4.1 INTRODUCTION
4.2 MATERIALS AND METHODS
4.2.1 Study sites
4.2.2 Sampling stations
4.2.3 Sediment characteristics
4.2.4 Macrofaunal community analysis
4.2.5 Statistical analysis
4.3 RESULTS
4.3.1 Sediment characteristics
4.3.2 Macrofaunal characteristics
4.4 DISCUSSION
4.4.1 GE and HAM: contrasting patterns
4.4.2 Indices
4.4.3 Comparisons and recommendations
CHAPITRE 5 
Responses of benthic macrofauna and biogeochemical fluxes to various levels of mussel biodeposition: an in situ «benthocosm» experiment 
5.1 INTRODUCTION
5.2 MATERIALS AND METHODS
5.2.1 Benthocosms and biodeposition rates
5.2.2 Sediment organic matter content
5.2.3 Macrofaunal community analysis
5.2.4 Biogeochemical fluxes
5.2.5 Statistical analysis
5.3 RESULTS
5.3.1 Sediment organic matter content
5.3.2 Macrofauna
5.3.3 Biogeochemical fluxes
5.4 DISCUSSION
5.4.1 Biodeposition rates vs sediment organic enrichment
5.4.2 Macrofaunal response
5.4.3 Biogeochemical fluxes
5.4.4 Conclusions
CHAPITRE 6  CONCLUSION