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

LIBRIS-ID:oai:gup.ub.gu.se/274457
https://gup.ub.gu.se/publication/274457URI
https://doi.org/10.1016/j.marenvres.2018.09.001DOI
oai:researchportal.hkr.se/admin:publications/cff9cb7a-5e11-4b00-a7cb-356ab51ed91fURI

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.

NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap Oceanografi, hydrologi och vattenresurser hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Oceanography, Hydrology and Water Resources hsv//eng
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

Bhavya, P. S.India (author)
Ramesh, R.India (author)
Gupta, G. V. M.India (author)
Chiriboga, FidelGothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences,University of Gothenburg (author)
Singh, A.India (author)
Karunasagar, I.India (author)
Rai, A.India (author)
Rehnstam-Holm, A. S.Man and Biosphere Health (MABH) (author)
Edler, L.WEAQ Lab (author)
Godhe, Anna,1967Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences,University of Gothenburg(Swepub:gu)xgodan (author)
IndiaInstitutionen för marina vetenskaper (creator_code:org_t)

In:Marine Environmental Research: Elsevier BV141:October, s. 196-2040141-11361879-0291

By the author/editor: Kumar, S.; Bhavya, P. S.; Ramesh, R.; Gupta, G. V. M.; Chiriboga, Fidel; Singh, A.; show more...; Karunasagar, I.; Rai, A.; Rehnstam-Holm, A ...; Edler, L.; Godhe, Anna, 196 ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Environmental Sc ...

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Oceanography Hyd ...

By the university: University of Gothenburg; Kristianstad University College

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