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Kanuri VV, Muduli PR, R S R, B CK, A LR, Patra S, Gupta GVM, Nageswara Rao G, A V R, B R S. Bioavailable dissolved organic matter and its spatio-temporal variation in a river dominated tropical brackish water Lagoon, India. Mar Pollut Bull 2018; 131:460-467. [PMID: 29886972 DOI: 10.1016/j.marpolbul.2018.04.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 04/16/2018] [Accepted: 04/25/2018] [Indexed: 06/08/2023]
Abstract
Bioavailable dissolved organic carbon (BDOC), nitrogen (BDON) and their degradation rate constants were measured for the Chilika Lagoon, India. Long-term laboratory incubation experiments (90 days) were conducted at a constant temperature (25 °C) to quantify the bioavailable dissolved organic matter (DOM) and the possible degradation rate coefficients. The results showed that 41 ± 12% of dissolved organic carbon (DOC) and 47 ± 17% of dissolved organic nitrogen (DON) were BDOC and BDON respectively, with their stoichiometry found to be higher than the Redfield ratio. A first order exponential non-linear fitting routine was used to estimate pool sizes. The degradation rate constant (k) for the BDOC varied from 0.127-0.329 d-1 and BDON from 0.043-0.306 d-1 during the study period. Half-lives of the BDOC and BDON ranged from 2.1-5.4 and 2.2-15.9 days, respectively. Overall, the results showed that a fraction of the labile DON was transported from the lagoon to the adjacent coastal sea.
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Affiliation(s)
- Vishnu Vardhan Kanuri
- ICMAM Project Directorate, Ministry of Earth Sciences, Pallikaranai, Chennai, India; NGRBA, Central Pollution Control Board, Eastern Regional Directorate, Kolkata, India.
| | - Pradipta R Muduli
- Wetland Research and Training Centre, Chilika Development Authority, Balugaon, India
| | - Robin R S
- NCSCM, Ministry of Environment, Forests and Climate Change, Anna University Campus, Chennai, India
| | - Charan Kumar B
- Marine Biology Laboratory, Department of Zoology, Andhra University, Visakhapatnam, India
| | - Lova Raju A
- Marine Biology Laboratory, Department of Zoology, Andhra University, Visakhapatnam, India
| | - Sivaji Patra
- ICMAM Project Directorate, Ministry of Earth Sciences, Pallikaranai, Chennai, India
| | - G V M Gupta
- CMLRE, Ministry of Earth Sciences, Kendriya Bhavan, Cochin, India
| | - G Nageswara Rao
- Department of Inorganic and Analytical Chemistry, Andhra University, Visakhapatnam, India
| | - Raman A V
- Marine Biology Laboratory, Department of Zoology, Andhra University, Visakhapatnam, India
| | - Subramanian B R
- NCSCM, Ministry of Environment, Forests and Climate Change, Anna University Campus, Chennai, India
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