Temporal variability of diazotroph community composition in the upwelling region off NW Iberia.

ABSTRACT: Knowledge of the ecology of N₂-fixing (diazotrophic) plankton is mainly limited to oligotrophic (sub)tropical oceans. However, diazotrophs are widely distributed and active throughout the global ocean. Likewise, relatively little is known about the temporal dynamics of diazotrophs in productive areas. Between February 2014 and December 2015, we carried out 9 one-day samplings in the temperate northwestern Iberian upwelling system to investigate the temporal and vertical variability of the diazotrophic community and its relationship with hydrodynamic forcing. In downwelling conditions, characterized by deeper mixed layers and a homogeneous water column, non-cyanobacterial diazotrophs belonging mainly to nifH clusters 1G (Gammaproteobacteria) and 3 (putative anaerobes) dominated t

SUBMITTER: Moreira-Coello V 

PROVIDER: S-EPMC6403370 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature