Interstitial water - sediment geochemistry of N, P and Fe and its response to overlying waters of tropical estuaries: a case from the southwest coast of India

Babu, K. Narendra; Ouseph, P. P.; Padmalal, D.

doi:10.1007/s002540050475

Cited by 27 publications

(13 citation statements)

References 7 publications

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“…Nutrient elements in the study region did not show any seasonal trend as reported in the case of other Indian estuaries [18,19]. Seasonal changes are difficult to observe in surface sediments of estuaries due to periodic resuspension by tidal currents, bioturbation, and postdepositional chemical reactions [20].…”

Section: Discussionmentioning

confidence: 74%

Geochemical characteristics of surficial sediments in a tropical estuary, south-west India

Renjith

Chandramohanakumar

2007

Chemistry and Ecology

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Geochemical characteristics of surficial sediments in the Panangad region of Cochin estuary, the largest brackish-water humid ecosystem in the south-west coast of India, were analysed. Temporal variations in nutrient stoichiometry, seasonal characteristics of redox elements Fe and S, and the phosphorus geochemistry were employed for the purpose. The stoichiometric analysis pointed towards autochthonous origin of organic matter, possibility of nitrogen limitation, and allochthonous modification of redox conditions. Seasonal variations were not statistically significant for all the geochemical parameters, whereas significant spatial variations were observed with lower values at sandy stations, suggesting that the texture of the sediments is the main factor influencing the sediment geochemistry. Significant inter-relations between the geochemical parameters also suggest a common control mechanism. Based on these geochemical characteristics, the study region can be effectively categorized into two distinct zones, viz. (1) erosion and transportation and (2) deposition zones.

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Section: Discussionmentioning

confidence: 74%

Geochemical characteristics of surficial sediments in a tropical estuary, south-west India

Renjith

Chandramohanakumar

2007

Chemistry and Ecology

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“…Total phosphorous (TP) and reactive phosphorus showed almost similar seasonal and depthwise variations. One of the key factors that enrich the phosphate concentration in overlying water was the exchange of phosphorous between water and sediment through interstitial water (Babu et al 2000). The disturbance of surface sediments due to tidal effects and turbulence of freshwater in nonmonsoon and monsoon seasons, respectively, may probably be responsible for the irregular spatial variation of phosphorus in the estuary.…”

Section: Resultsmentioning

confidence: 99%

“…The Ashtamudi estuary, one of the Ramsar site, is the second largest estuarine system in Kerala after the Vembanad estuary. Studies on different aspects of the estuary such as the physicochemical pollution aspects and sedimentary and interstitial water chemistry were conducted (Nair et al 1993;Babu 1993;Babu et al 2000). The objective of the present study is to evaluate the extent of anthropogenic contamination of water and sediments in Ashtamudi estuary through statistical approach.…”

Section: Introductionmentioning

confidence: 99%

Water and sediment quality of Ashtamudi estuary, a Ramsar site, southwest coast of India—a statistical appraisal

Babu

Omana

Mohan

2009

Environ Monit Assess

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Ashtamudi estuary, situated on the southwest coast of India, is enormously affected by anthropogenic interventions. Physicochemical quality of water and sedimentological features of the estuary are evaluated during monsoon and nonmonsoon seasons to elucidate its quality variations and to link the same with existing environmental scenario. The whole data has been factorized using principal component analysis for extracting the total variability and linear relationships existing among a set of different physicochemical parameters of the backwater system. In PCA, high loadings were obtained for conductivity, salinity, fluoride, calcium, magnesium, sulfate, boron, and pH. The results were revealed that all the physicochemical processes depend upon seasonal fluctuation of freshwater input and seawater intrusion. Wide spatial concentration fluctuations of organic carbon and iron in bottom sediment have been noticed and both constituents reveal good correlation with sediment texture. The results showed high deterioration of the physicochemical quality of water during nonmonsoon season with respect to monsoon season.

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“…3). The inorganic phosphorus is high during post monsoon whereas total phosphorus (TP) is high during SW. One of the key factors that enrich the phosphate concentration is the exchange of phosphorous between water and sediment through interstitial water as well as the regenerative property of the sediment is known to play an indispensable role on the distribution of the nutrient (Reddy and Sankaranarayanan 1972;Babu et al 2000Babu et al , 2010. The Chl a in the upper layer of tropical oceans is limited by the availability of nutrients.…”

Section: Methodsmentioning

confidence: 99%

Spatio-temporal variability of hydro-chemical characteristics of coastal waters of Gulf of Mannar Marine Biosphere Reserve (GoMMBR), South India

2014

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The intention of this study was to appraise the spatial and temporal variations in the physico-chemical parameters of coastal waters of Rameswaram Island, Gulf of Mannar Marine Biosphere Reserve, south India, using multivariate statistical techniques, such as cluster analysis, factor analysis and principal component analysis. Spatiotemporal variations among the physico-chemical parameters are observed in the coastal waters of Gulf of Mannar, especially during northeast and post monsoon seasons. It is inferred that the high loadings of pH, temperature, suspended particulate matter, salinity, dissolved oxygen, biochemical oxygen demand, chlorophyll a, nutrient species of nitrogen and phosphorus strongly determine the discrimination of coastal water quality. Results highlight the important role of monsoonal variations to determine the coastal water quality around Rameswaram Island.

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Interstitial water - sediment geochemistry of N, P and Fe and its response to overlying waters of tropical estuaries: a case from the southwest coast of India

Cited by 27 publications

References 7 publications

Geochemical characteristics of surficial sediments in a tropical estuary, south-west India

Geochemical characteristics of surficial sediments in a tropical estuary, south-west India

Water and sediment quality of Ashtamudi estuary, a Ramsar site, southwest coast of India—a statistical appraisal

Spatio-temporal variability of hydro-chemical characteristics of coastal waters of Gulf of Mannar Marine Biosphere Reserve (GoMMBR), South India

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