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Asian Journal of Plant Sciences

Year: 2006 | Volume: 5 | Issue: 5 | Page No.: 871-880
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Authors

N. Jafari Ghavzan

V.R. Gunale

D.M. Mahajan

D.R. Shirke

Keywords

Research Article

Effects of Environmental Factors on Ecology and Distribution of Aquatic Macrophytes

N. Jafari Ghavzan, V.R. Gunale, D.M. Mahajan and D.R. Shirke
Riparian plants are excellent indicators of river condition for many reasons including their relatively high levels of species richness, rapid growth rates and direct response to environmental change. Many human-related alterations to the environment that act to degrade rivers ecosystems cause shifts in plant community composition. In the present study the phytosociological analysis of ten sampling stations of Mula, Mutha and Pavana rivers flowing through the Pune city (Mahareshtera-India) were investigated. Some of the species like Eichhornia crassipes, Pistia stratiotes, Lemna perpusilla, Azolla pinnata in the upstream sampling stations were absent or very low value of frequency index, relative frequency, density and abundance. This is indicating very rare occurrence of this species in clean water or less polluted water body. Wherever, the above species associated with Alternanthera sessilis, Persicaria glabra, Cyperus compressus, Amaranthus tricolor were observed with highest frequency index, relative frequency, density, relative density and abundance at downstream sampling stations of study area. Results obtained indicate that due to various developmental activities in and around banks of Mula, Mutha and Pavana rivers the dominance of weed species are more common than natural vegetation. It clearly indicates the human activities influence in riverine vegetation.
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