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- Title
Seasonal dynamics of nitrogen fixation and the diazotroph community in the temperate coastal region of the northwestern North Pacific.
- Authors
Shiozaki, T.; Nagata, T.; Ijichi, M.; Furuya, K.
- Abstract
Nitrogen fixation in temperate oceans is a potentially important, but poorly understood process that may influence the marine nitrogen budget. This study determined seasonal variations in nitrogen fixation and nifH gene diversity within the euphotic zone in the temperate coastal region of the northwestern North Pacific. Nitrogen fixation as high as 13.6 nmolN L-1 d-1 was measured from early summer to fall when the surface temperature exceeded 14.2 °C and the surface nitrate concentration was low (≤ 0.30 µM), although we also detected nitrogen fixation in subsurface layers (42-62 m) where nitrate concentrations were high (> 1 µM). During periods with high nitrogen fixation, the nifH sequences of UCYN-A were recovered, suggesting that these groups played a key role in nitrogen fixation. The nifH genes were also recovered in spring and winter when nitrogen fixation was undetectable. These genes consisted of many sequences affiliated with Cluster III diazotrophs (putative anaerobic bacteria), which hitherto have rarely been reported to be abundant in surface diazotroph communities in marine environments.
- Subjects
NORTH Pacific Ocean; NITROGEN fixation; OCEAN temperature; ANAEROBIC bacteria; EUPHOTIC zone
- Publication
Biogeosciences Discussions, 2015, Vol 12, Issue 1, p865
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bgd-12-865-2015