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Nitrogen uptake potential under different temperature-salinity conditions: Implications for nitrogen cycling under climate change scenarios

Journal article
Authors S. Kumar
P. S. Bhavya
R. Ramesh
G. V. M. Gupta
Fidel Chiriboga
A. Singh
I. Karunasagar
A. Rai
A. S. Rehnstam-Holm
L. Edler
Anna Godhe
Published in Marine Environmental Research
Volume 141
Issue October
Pages 196-204
ISSN 0141-1136
Publication year 2018
Published at Department of marine sciences
Pages 196-204
Language en
Links dx.doi.org/10.1016/j.marenvres.2018...
Keywords Nitrogen, Uptake, Climate change, Phytoplankton, Mesocosm experiment, harmful algal blooms, arabian sea, phytoplankton community, marine-phytoplankton, indian-ocean, heterotrophic bacteria, southwest, monsoon, nitrate uptake, f-ratio, assimilation, Environmental Sciences & Ecology, Marine & Freshwater Biology, Toxicology, allister cd, 1961, limnology and oceanography, v6, p237, carthy jj, 1977, limnology and oceanography, v22, p996, ates of america, v105, p6668, carthy jj, 1972, limnology and oceanography, v17, p371
Subject categories Oceanography, Hydrology, Water Resources, Environmental Sciences

Abstract

As projected by climate change models, increase in sea surface temperature and precipitation in the future may alter nutrient cycling in the coastal regions due to potential changes in phytoplankton community structure and their ability to assimilate nitrogen (N) and carbon (C). An experiment simulating different temperature and salinity conditions (28 degrees C-35 ambient conditions, 28 degrees C-31, 31 degrees C-35 and 31 degrees C-31) in mesocosms containing 1000 L of coastal water from the Arabian Sea was performed and N uptake rates were measured using N-15 tracer technique on 2nd, 5th, 7th and 10th day of the experiment. The results show that, under all conditions, the total N (NO3- + NH4+) uptake rates were lower in the beginning and on the final day of the tracer experiment, while it peaked during middle, consistent with chlorophyll a concentrations. Total N uptake rate was significantly lower (p = 0.003) under ambient temperature -lower salinity condition (28 degrees C-31) than the others. This indicates that lowering of salinity in coastal regions due to excessive rainfall in the future may affect the N uptake potential of the phytoplankton, which may change the regional C and N budget.

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