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dc.contributor.authorBandyopadhyay, Debasmita
dc.contributor.authorBiswas, H.
dc.date.accessioned2021-09-30
dc.date.accessioned2021-10-01T07:25:49Z
dc.date.available2021-08-01
dc.date.available2021-10-01T07:25:49Z
dc.date.issued2021
dc.identifier.citationEuropean Journal of Phycology, vol.56(3); 2021; 273-288
dc.identifier.issn1469-4433
dc.identifier.otherhttps://www.tandfonline.com/doi/abs/10.1080/09670262.2020.1834146
dc.identifier.urihttps://doi.org/10.1080/09670262.2020.1834146
dc.identifier.urihttps://drs.nio.org/drs/handle/2264/8718
dc.descriptionIF2020 - 2.804
dc.description.abstractThe worldwide release of excessive nutrients (nitrogen [N], silicon [Si] and phosphorus [P]) into coastal waters is impacting phytoplankton growth and community structure. The coastal Bay of Bengal (BoB) is predicted to be 90% more eutrophic in the future; the impacts on phytoplankton are largely unknown. We present the first experimental results concerning the responses of coastal phytoplankton to changing nutrient stoichiometry (N:Si:P) in the southwest BoB. A gradual increase in Si, N and P supply resulted in exponential growth and significant nutrient depletion ( Delta ). The nutrients reaching the Bay are likely to possess a short residence time. We also show that any alteration in nutrient loading ratio may impact nutrient removal dynamics of N, Si and P differently. Growth-saturating concentrations for Si, N and P were ~55, 65 and 10 mu M respectively, whereas luxury uptake was seen up to 20 mu M for P and 65 mu M for N and Si. Net consumption of N ( Delta N) and P ( Delta P) was decoupled from increasing Si concentrations. Gradual N enrichment under P- and Si-saturated conditions linearly increased Delta Si as well as Delta P, and diatoms dominated over cyanobacteria. The diatoms Thalassiosira spp. seemed to respond positively to N enrichment, probably due to their high nitrate uptake and storage capacity. Nitzschia spp, a pennate diatom, showed the opposite trend. Such modifications may have direct consequences on the food chain. The rates of N, Si and P removal under saturated concentrations were 1.03 � 0.27, 1.35 � 0.14 and 0.14 � 0.02 mu mol chlorophyll a-1 d-1, respectively and yielded a ratio of 7.5:9.8:1 (N:Si:P). The departure from the Redfield ratio (indicating eutrophication) in the Bay may potentially alter nutrient removal patterns, phytoplankton community composition and autochthonous organic matter stoichiometry
dc.languageen
dc.publisherTaylor and Francis
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleImpacts of variable nutrient stoichiometry (N, Si and P) on a coastal phytoplankton community from the SW Bay of Bengal, India
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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