In this session we invite presentations on the biology and ecology of the deep sea, seamounts and canyons. While knowledge has grown on deep sea biodiversity, faunal distribution and links to key habitat features, fundamental discoveries are still being made with every expedition. How much have we learned about ecological structure and processes in deep sea communities, under both taxonomic and functional perspectives? Are biodiversity patterns with depth modulated by habitat features and by offshore gradients? This session will also welcome presentations on technological advances to investigate deep sea ecology.