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Table of contents
Chapitre 1: Organic matter storage in the hyporheic zone of headwater streams
1.1. Résumé
1.2. Abstract
1.3. Introduction
1.4. Methods
1.5. Results
1.6. Discussion
1.7. Bibliographie
Chapitre 2: Early stages of leaf decomposition are mediated by aquatic fungi in the hyporheic zone of woodland streams
2.1. Résumé
Summary
Introduction
Methods
Study site
Leaf decomposition
Microbial respiration on leaves
Spore production and fungal diversity
Fungal biomass
Macroinvertebrates
Carbon budget
Statistics
Results
Litter decomposition and nitrogen dynamics
Leaf‐litter‐associated microbial respiration
Spore production and fungal diversity
Fungal biomass
Shredders
Carbon budget
Discussion
Benthic versus hyporheic litter breakdown rates
Physical constraints
Oxygen limitation and biotic responses
Relative contribution of benthic and hyporheic decomposers
Links contribution of benthic and hyporheic food webs
Acknowledgments
References
Chapitre 3: Multiple screening of aquatic hyphomycetes in the hyporheic zone of woodland streams
3.1. Résumé
3.2. Abstract
3.3. Introduction
3.4. Materials and methods
Aquatic hyphomycete spores circulating in the hyporheic zone
Study sites
Stream characterisation
Construction and placement of sampling devices
Spore sampling
Effects of hyporheic constraints on spore production by aquatic hyphomycete species
Stream inoculation
Microcosms, medium and experimental set up
Relative spore production of aquatic hyphomycete species
Dissolved oxygen measurement
Spore dispersal efficiency across the sediment
Preparation of spore suspensions
Microcosms for the study of spore dispersal through sediment
Experiments on single‐ and multispecies spore suspensions
Statistical analyses
Aquatic hyphomycete spores circulating in the hyporheic zone
Effects of hyporheic constraints on spore production by hyphomycete species
Spore dispersal efficiency across the sediment
3.5. Results
Aquatic hyphomycete spores circulating in the hyporheic zone
Effects of hyporheic constraints on spore production by aquatic hyphomycete species
Spore dispersal efficiency across the sediment
3.6. Discussion
Abundance and diversity of hyphomycetes in the hyporheic zone of woodland streams
Differential spore production among aquatic hyphomycete species in the hyporheic zone
Conidial traits and dispersal efficiency in the hyporheic zone
3.7. Overview
3.8. References
Chapitre 4: Effects of burial on leaf physico‐chemical traits, microbial conditioning and palatability to three invertebrate shredders
4.1. Résumé
4.2. Abstract
4.3. Introduction
4.4. Material and Methods
Study site
Leaf litter conditioning and mass loss
Microbial colonization of leaves and litter quality
Palatability test
Individual consumer growth rates
Statistical analyses
4.5. Results
Physico‐chemical conditions in benthic and hyporheic zones
Leaf litter decomposition and conditioning
Leaf litter quality to consumers
Leaf litter palatability to consumers
Effect of leaf litter burial on consumer growth rates
4.6. Discussion
Effect of leaf litter burial on leaf litter conditioning and quality
Effect of leaf litter burial on leaf litter palatability and consumer growth rates
4.7. Overview
4.8. References
Chapitre 5: Effects of anthropogenic acidification on leaf litter processing in the hyporheic zone of headwater streams
5.1. Résumé
5.2. Abstract
5.3. Introduction
5.4. Materials and methods
Site
Leaf decomposition
Fungal diversity
Fungal biomass
Macroinvertebrates
Fine particulate organic matter production
Statistical analysis
5.5. Results
Litter decomposition
Fungal diversity and biomass
Shredders
Microbial FPOM
5.6. Discussion
5.7. References
Discussion générale et perspectives
