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Sinking particles promote vertical connectivity in the ocean microbiome #MMPMID29967136
Mestre M; Ruiz-González C; Logares R; Duarte CM; Gasol JM; Sala MM
Proc Natl Acad Sci U S A 2018[Jul]; 115 (29): E6799-807 PMID29967136show ga
Prokaryotes dominate the living biomass and the biological diversity of the ocean, one of the largest ecosystems on earth. The sinking of particles is a widespread mechanism that transports materials to the deep ocean, with a significant role in the global carbon cycle. Whether this process constitutes a global dispersal pathway for prokaryotic diversity connecting surface communities to those in the dark ocean has never been tested. Here we show that surface and deep-sea prokaryotic communities are strongly connected, constituting a vast oceanic metacommunity where local assemblages are linked through the transport of sinking particles. This vertical dispersal, mediated mainly by the largest sinking particles, emerges as a fundamental process shaping the assembly and biogeography of deep ocean prokaryotic communities.