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Table of contents
Chapter 1: Introduction
1.1 Coastal lagoons
1.1.1 General characteristics
1.1.2 Classification
1.1.3 Ecological characteristics
1.1.4 Threats to coastal lagoons
1.2 Groundwater processes
1.2.1 Terrestrial groundwater and porewater fluxes (recirculation)
1.2.2 Quantification techniques
1.2.3 Groundwater- and recirculation-driven nutrient in coastal ecosystems
1.3 Study site description
1.3.1 French Mediterranean coastal lagoons
1.3.2 La Palme lagoon
1.3.3 Salses-Leucate lagoon
Chapter 2: Groundwater-driven nutrient inputs to coastal lagoons: the relevance of lagoon water recirculation as a conveyor of dissolved nutrients
2.1 Introduction
2.2 Theory
2.2.1 Concurrent water and radon mass balances for surface waters
2.3 Methods
2.3.1 Porewater collection and analysis
2.3.2 Surface water collection and analysis
2.3.3 Ancillary measurements and analysis
2.3.4 Radon equilibration experiment
2.4 Results
2.4.1 Porewater profiles
2.4.2 Radon and salinity distributions in lagoon surface waters
2.4.3 Nutrients in lagoon surface waters
2.4.4 Estimation of karstic groundwater and recirculation inputs from water and radon mass balances
2.4.5 Nutrient fluxes from karstic groundwater and recirculation
2.5 Discussion
2.5.1 Uncertainties on estimated radon, water and nutrient fluxes from recirculation
2.5.2 Nutrient fluxes to La Palme lagoon
2.5.3 The role of lagoon water recirculation as nutrient source
2.6 Conclusions
Chapter 3: Primary production in coastal lagoons supported by groundwater discharge and porewater fluxes inferred from nitrogen and carbon isotope signatures
3.1 Introduction
3.2 Materials and Methods
3.2.1 Nutrient sources
3.2.2 Sample collection and analysis
3.3 Results
3.3.1 NO3- and NH4+ concentrations
3.3.2 Source isotopic signatures
3.3.3 δ15N in macrophytes and POM
3.3.4 δ13C in macrophytes and POM
3.3.5 Interspecific variations in isotopic signature in macrophytes
3.4 Discussion
3.4.1 Processes affecting macrophyte and phytoplankton δ15N
3.4.2 Macrophyte and phytoplankton carbon uptake and isotope signature
3.5 Conclusion
Chapter 4: Enhanced growth rate of the Mediterranean mussel in a coastal lagoon driven by groundwater inflow
4.1 Introduction
4.2 Materials and Methods
4.2.1 Study sites
4.2.2 Installation of mussel cages and monitoring of environmental parameters
4.2.3 Sample preparation
4.2.4 Condition Index
4.2.5 Growth analyses
4.2.6 Growth curves
4.2.7 Statistical analyses
4.3 Results
4.3.1 Condition index
4.3.2 Shell growth rate
4.3.3 Growth curves
4.3.4 Growth increments
4.3.5 Environmental parameters
4.4 Discussion
4.4.1 Periodicity in shell growth and environmental influences
4.4.2 Growth of M. galloprovincialis in the Mediterranean region
4.4.3 Role of groundwater discharge
4.4.4 Economic implications
4.5 Conclusion
Chapter 5: Conclusion and perspectives
5.1 Conclusion
5.1.1 Quantification of nutrient fluxes from groundwater discharge and recirculation (Chapter 2)
5.1.2 Role of groundwater discharge and porewater fluxes in supporting primary production (Chapter 3)
5.1.3 Effects of groundwater discharge in the growth of the Mediterranean mussels (Chapter 4)
5.2 Research perspectives
References
