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Last modified
7/14/2009 5:02:37 PM
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5/22/2009 6:55:58 PM
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UCREFRP
UCREFRP Catalog Number
9686
Author
Flathead Lake Biological Station.
Title
FISORS III Fifth International Symposium On Regulated Streams.
USFW Year
1991.
USFW - Doc Type
Polson, MT.
Copyright Material
NO
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Methodologies and Approaches in Regulated River Research and <br />Management <br />ECOTENDENCY OF PHYTOPL.ANICTON: AN APPROACH FOR CATEGORIZING ALGAE AS <br />BIO-INDICATORS FOR MONITORING WATER QUALITY. A.K. Laal, S.K. Sarkar, <br />A. Sarkar and M. Karthikeyan, Central Inland Capture Fisheries Research <br />Institute, Reservoir Division, Bangalore-560010, India. <br />Rapid changes in trophic and saprobic levels were due to <br />flood-flushings during monsoon and sewage discharge round the year <br />in the channel-Jamunia Kol. Total alkalinity was highly correlated <br />with chloride, D.O.M., POq, Si02 and nitrate. Effect of temperature <br />(x~) -total alakalinity (x2), DOM (x3), chloride (xq) and Si02 (xs) on <br />phytoplankton population (y) were statistically significant. Multiple <br />regression fitted to the observed data were- <br />Y = 955568.0201 + 25385.4548 X1+1559.5625 X2- <br />13492.8324 X3-2177.0622 Xq+12245.1467 X5 <br />(R2=0.8851) <br />A shift in algae with progressive trophic and saprobic <br />states was clearly demarcated. Specifically certain algae such as <br />Gonatozygon kinhani may be categorized as bio-indicator conditions <br />as oligotrophic and oligosaprobic, Euglena acus (> 30 u !-~) for <br />eutrophic and ~-mesosaprobic, Spirulina princeps (> 800 u I-~) for <br />hyper-eutrophic and polysaprobic. Members of volvocales around <br />150 u I-~~ Chlorococcales 900 u I-~ and Eugleneids :1200 u I•~ <br />indicated for eutrophic, ~-mesosaprobic conditions, more than the <br />above mentioned numbers of these algal members indicating for <br />increasing trends of trophic and saprobic levels. Generally, <br />Myxophyceae viz. Microcystis aeruginosa, Oscillatoria Jimosa, <br />Spirulina princeps together more than 6000 u I-~ may be categorized <br />as bio-indicators for hypereutrophic and polysaprobic condition of <br />water. Members of Bacillariophyceae indicated wide tolerance. <br />Correlation co-efficient between Zygnemateles and nitrate <br />(r=-0.6111) was found to be significant at 5% level, and <br />Myxophyceae and POq were negatively correlated. <br />OBSERVATIONS ON THE UTILITY OF SAPROBIAN SYSTEN IN TROPICAL <br />RIVERINE ECOSYSTEMS: AN EXPERIMENTAL APPROACH. K.S. Rao, S. Shrivastava, <br />U. Choubey and B.S. Rao, S.S, in Zoology, Vikram University, Ujjain (M.P.) India. <br />For water quality monitoring in Chambal river, seven study sites were selected along a stretch <br />of 170 Km.. Details of the B.O.D. levels, Species density and diversity show that -these values <br />were normal at stations I and II showing greater sps. diversity and lesser sps. density. At <br />station III where effluents of Nagda rayon factory join river Chambal species diversity was <br />drastically reduced and density and B.O.D. have increased upto 2000 org sq.m. and 193 mg/1 <br />respectively. The same parameters at 5 sampling study sites of Khan river (6k Km.), k study <br />sites of Kshipra river, (30 Km.), and nine study sites of Narmada river (600 Km.) show a <br />similar pattern. The community zonation of saprobity and other parameters show a <br />comparatively better water quality of Western zone of Narmada river, while Chambal and <br />Khan rivers show high levels of contamination and Kshipra river shows an intermediate condition. <br />The seasonal impact factors computed in order of monsoon, winter and summer for different <br />rivers based on density/diversity ratio range 1:1.6:2 for river Chambal, 1:1.5:2 for river Khan, <br />1:3:5 for river Kshipra and 1:3:5 for Narmada river. It is interesting to note that the earlier <br />studies of Rao et. al. (1987) derived the same ratio 1:1.5:2 with freshwater Bryozoa as <br />indicator organisms based on their studies from several lentic and folic aquatic bodies of <br />Central India, with the help of nested classification model of a completely randomised sample. <br />It is suggested that the ratios of seasonal impact derived for Kshipra, Khan, Chambal and <br />Narmada rivers broadly agree with these, and with further reports on similar lines these <br />ratios may be standarized. <br />15 <br />
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