Abstract. Municipal sewage both untreated and treated, that pollutes the water bodies was used growing Casuarinas (Casuarina equisetifolia Forst. & Forst.), an exotic bio-shield tree species on sandy soil at Kalpakkam on the East Coast of Indian peninsula; it may help in reducing aquatic pollution as well as in preventing the high tides like Tsunami. Significant increase in growth performance in plant-height, branches, root length and the biomass was recorded in the saplings irrigated with untreated municipal raw sewage (RS) and treated sewage (TS) compared to that irrigated with unpolluted potable water (PW) over a period of 13 months, October 2005 to October 2006. These growth parameters showed close relationship with the nutrient contents of municipal RS, TS and PW, the former being characterized by relatively higher pH, electrical conductivity (µs/cm), total dissolved solids, total suspended solid, total hardness, chloride, sulphate, biochemical oxygen demand, chemical oxygen demand, calcium, magnesium, sodium, potassium, bicarbonates, total alkanity, nitrate, phosphate and carbonates (mg/l) compared to that of the TS and PW indicating profound influence of municipal sewage on the plant growth.
Abstract. The present study, the influence of habitat structure on fish assemblages were assessed in fifteen selected streams of Western Ghats, India. Each stream 100m reach was quantified for depth, flow, velocity, fish cover, percentage of pool and riffle and fish density. Highest mean velocity (0.4 m/sec.) was recorded in Thalanai stream and deeper habitats were found in Kallar stream. High species diversity was found in Achankoil stream (H'=1.15) and low species diversity was recorded in Hanumannadhi stream (H' = 0.71). The physical habitat structure (depth, current and substrate) and cover complex were evaluated by using Evenness index (H'/H' max ). High diverse of physical habitat complex were encountered in Gugalthurai stream (E=2.8) and high value of cover complex was encountered in Sirkuli stream. Regression analysis showed that there was a significant correlation between habitat variables and fish abundance in all the sites and the cover complex values is not significantly correlated with abundance.
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