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Distribution of nutrients and major elements in riverine, estuarine and adjoining coastal waters of Godavari, Bay of Bengal

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Title Distribution of nutrients and major elements in riverine, estuarine and adjoining coastal waters of Godavari, Bay of Bengal
 
Creator Padmavathi, D
Satyanarayana, D
 
Description 345-354
Studies on
the hydrographical parameters (salinity, temperature and dissolved oxygen)
indicated distinct spatial and temporal variations. Nutrients (NO3-N,
NH4-N, PO4-P and SiO4-Si) in general,
exhibited a decreasing trend from riverine to estuarine and coastal region
indicating their dominant occurrence with river water. This was also supported by
relatively higher levels in September (monsoon) when compared with
January/February (postmonsoon) and May (premonsoon). Nutrients showed in
general, an increasing trend from surface to the bottom particularly at
farthest stations in the coastal region, which was due to their uptake at
surface and remineralisation in the water column. All the nutrients exhibited
distinct non-conservative behaviour with a net removal of 26-36% for silicon,
19-24% for ammonium,14-16% for nitrate and 4-18% for phosphate. This was
attributed to the combined effects of biological uptake by phytoplankton and
desorption from the suspended particulates. Major elements (F, B, Ca and Mg)
indicated an increasing trend from riverine to estuarine and shelf regions.
They exhibited higher concentration in May followed by January/February and
September and were predominanHn seawater. Fluoride showed non-conservative
behaviour with a net removal of 13 and 10% during September and May
respectively and conservative behaviour in January/February. While the former
was attributed to its adsorption on

suspended
solids in September and biological uptake in May, the latter was explained on
the basis of simple physical mixing of seawater with fresh water. Boron showed
non-conservative behaviour with a net removal of 12 to 19% which was attributed
to its adsorption on to the suspended matter containing river borne clay
minerals. Calcium and magnesium showed conservative behaviour in May and
semi-conservative behaviour during September and January/February with a small
net addition and removal respectively, in the latter. While the net addition in
September may be due to their exchange

with other cations during
early stages of mixing, the removal during January/February is believed to be
due to their involvement in the biological and/or geochemical processes.
Estimation of nutrient and major elemental fluxes from Godavari river into the Bay of Bengal indicated their predominant input in
monsoon (June-November) than non-monsoonal (December-May) period.
 
Date 2014-01-15T09:45:04Z
2014-01-15T09:45:04Z
1999-12
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/25714
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.28(4) [December 1999]