Journal
MARINE POLLUTION BULLETIN
Volume 151, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2019.110799
Keywords
Cochin estuary; Diversity; N:P ratio; Monsoon; Nitrogen fixation rate
Funding
- Ministry of Earth Sciences (MoES), Government of India, under the Sustained Indian Ocean Biogeochemical and Ecological Research (SIBER) program
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Nitrogen fixation and its ecological regulation are poorly understood in the tropical estuaries, which are highly influenced by anthropogenic disturbances. In this study, we investigated the role of nutrient stoichiometry in the diversity, abundance and activity of N-2-fixing bacterial community and their seasonal variations in the water column of a tropical eutrophic estuary (Cochin estuary). The N-2 fixation rates in the estuary ranged from 0.1 to 2.0 nmol N-2 l(-1) h(-1), with higher activity during post-monsoon and lower during monsoon. The rates are appeared to be primarily controlled by dissolved inorganic nitrogen and phosphorous (N:P) ratio. Clone library analysis of nitrogenase (nifH) gene revealed that the major N-2 fixing phylotypes belong to Cluster I and Cluster III diazotrophs. The overall findings of this study suggest that monsoon induced seasonal changes in nutrient stoichiometry control the distribution and activity of diazotrophs in a tropical estuary.
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