Nutrients of the Cochin Backwater in relation to environmental characteristics

Sankaranarayanan, V.N.; Qasim, S. Z.

doi:10.1007/bf00351146

Cited by 61 publications

(22 citation statements)

References 9 publications

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“…The rate of primary production was measured following the light and dark bottle method as given by Strickland and Parsons (1972) and modified by Qasim et at (1969). All precautions suggested by Vollenweider (1969) have been strictly followed in conducting the experiments.…”

Section: Methodsmentioning

confidence: 99%

“…In the Cochin estuary also bottom water productivity was less than that of the surface water. According to Qasim et al (1969), nearly 90% of the total production is confined to a narrow zone ofO-l·5 m. During February-May (pre-monsoon period) and during June-September (monsoon period) when the turbidity was very high maximum production occurred at the surface, but during October-January (post-monsoon period) when the light penetration was greater maximum production occurred below the surface.…”

Section: Primary Productivity and Ecological Factorsmentioning

confidence: 99%

“…Similarly the correlation with the net productivity in the surface water was positively correlated at Ashtamudi, Kanjirakode and Kadapuzha whereas in the bottom water, the correlation was positive only at Ashtamudi and Kanjirakode. Qasim et al (1969)stated that while there is a close correlation between the cycles of phosphorus and organic production in the Cochin backwaters, the nitrogen cycle is completely unconnected with the productivity rhythm. But according to Pillai et al (1975) nitrite did not show any .relationship with primary production rates while phosphate distribution showed a negative relationship with the production rate in the same backwater tract.…”

Section: 1b Other Ecological Factorsmentioning

confidence: 99%

“…In the present study our data on the gross and net productivities, although exhibited certain positive trends with the environmental factors, generally remained independent with regard to peak productions both in the surface and bottom water. Sankaranarayanan and Qasim (1969) observed no firm basis for believing that the instantaneous concentrations of nutrients on inorganic salts in the estuary provide a significant source of phytoplankton bloom.…”

Section: 1b Other Ecological Factorsmentioning

confidence: 99%

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Ecology of Indian estuaries—V: Primary productivity of the Ashtamudi estuary, south-west coast of India

et al. 1984

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Primary productivity at four representative stations in the Ashtamudi estuary bas been presented. The average gross and net productivities in the surface water was maximum at Neendakara, the bar mouth zone and minimum at Kadapuzha, the riverine zone consistently exposed to pollution from paper mill effluents. Ashtamudi, the station directly on the gradient line and Kanjirakode, the station equidistant from Kadapuzha and Ashtamudi presented a transition phase with regard to the primary productivity. In the bottom water also productivity was minimum at the polluted zone. Generally productivity at sub-surface levels was higher than that at the surface. A seasonal pattern, independent of various environmental parameters, wasdiscernible both in the gross and net productivity changes at surface and sub-surface levels.High concentrations of dissolved oxygen, silicate and nitrite helped to maintain higher produetivities at Neendakara, Ashtamudi and Kanjirakode on several occasions during the year. The fact that productivity at the polluted Kadapuzha station was the lowest, indicates that the paper mill effluent bas considerably disturbed the productivity mechanism of this otherwise healthy ecosystem.

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Section: Methodsmentioning

confidence: 99%

Section: Primary Productivity and Ecological Factorsmentioning

confidence: 99%

Section: 1b Other Ecological Factorsmentioning

confidence: 99%

Section: 1b Other Ecological Factorsmentioning

confidence: 99%

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Ecology of Indian estuaries—V: Primary productivity of the Ashtamudi estuary, south-west coast of India

et al. 1984

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“…Ammonium (NH 4 + ) represented 80% of Dissolved Inorganic Nitrogen (DIN) and its highest values were always associated with fresh water inflow (Martin et al, 2008). Sankaranarayanan and Qasim (1969) suggested that the spatial and temporal variation in ammonia concentration might also be due to its oxidation to other forms or reduction of nitrates to lower forms in lake waters. (Sharma et al, 2008).…”

Section: Water Physico-chemical Propertiesmentioning

confidence: 99%