The silicon cycle in the aggregations of a deep-water hexactinellid sponge

María López-Acosta1, Manuel Maldonado1, Lindsay Beazley2, Benoit Casault2 and Ellen Kenchington3, (1)Center for Advanced Studies of Blanes (CEAB, CSIC), Department of Marine Ecology, Blanes, Spain, (2)Bedford Institute of Oceanography, Department of Fisheries and Oceans, Dartmouth, NS, Canada, (3)Bedforf Institute of Oceanography, Department of Fisheries and Oceans Canada, Dartmouth, NS, Canada