CARBON METABOLISM IN STREAM AND RIVERS - From dm to Continents
Ecosystem metabolism is fundamental to understand carbon cycling in rivers, at the local and global scale. Most estimates of gross primary production and ecosystem respiration are made at the reach scale, by measuring diel changes in oxygen concentration. However, scaling, heterogeneity, and methodological issues should be considered to drive conclusions at the Global scale. I will present the results from a series of metabolism measurements carried out at different scales and in different biomes (tropical, temperate, subarctic). I will discuss how different habitat compartments contribute to and scale up to whole‐stream estimates across watersheds. I will then present methodological and modeling improvements for measuring diel variations of d18O-O2 produced by respiring organisms as well as high frequency dissolved oxygen from logging sensors, and how these approaches reveal underestimates of current river carbon cycling. Finally, I will share ideas for future research in this topic, opening the discussion to possible collaborations.
Host: Alain Maasri