The priming effect is defined as a modification of the mineralization rate of putatively recalcitrant organic carbon as induced by labile organic carbon. Regarding the very large amount of carbon stored in soils and its potential for global carbon cycling, attention has been increasingly paid to the priming effect over the last decades. Most recently, priming has also been proposed to occur also in aquatic ecosystems. We invite presentations on the interactions of recalcitrant and labile organic carbon in general, and more particularly on priming, both in terrestrial and aquatic ecosystems. We particularly welcome presentations that provide new evidence on mechanisms underlying priming, such as catabolism or ecological stoichiometry, for instance. We also encourage submissions on modeling approaches that eventually connect priming with carbon cycling at larger scales. Finally, applied aspects of priming, such as the impact of soil erosion on lake eutrophication or nutrients release for agriculture, will be considered as well.