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Characterisation of tropical reservoirs in Tamil Nadu, India in terms of plankton assemblage using multivariate analysis

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Relation http://eprints.cmfri.org.in/10530/
http://epubs.icar.org.in/ejournal/index.php/IJF
 
Title Characterisation of tropical reservoirs in Tamil Nadu, India in terms of plankton assemblage using multivariate analysis
 
Creator Palaniswami, Rani
Manoharan, S
Mohan, Anjana
 
Subject Phytoplanktons
Zooplanktons
 
Description The ecological status of reservoirs in Tamil Nadu, India was studied in view of their importance in culture based fisheries.
The abundance and distribution pattern of plankton assemblages with respect to important water parameters was selected to
characterise the reservoirs. Sampling was carried out seasonally in 22 reservoirs widely ranging in trophic state, during 1993
to 2004. A definite distinction was observed between Western Ghats (WG), rain shadow (RS) and plain land reservoirs (PL)
based on plankton communities and environmental factors analysed. Western Ghats reservoirs lying at the head stream of rivers
tend to show chemically oligotrophic to mesotrophic status with characteristic dominance of phytoplankters viz., chlorophyta,
Selenastrum spp., Ankistrodesmus spp., bacillariophyta, Navicula spp., Nitzshia spp. and Synedra spp. and zooplankton, rotifer,
Brachionus spp. and copepod, Diaptomus spp. Eutrophic to hyper-eutrophic status with dominant presence of cyanophyta,
Microcystis aeruginosa in all the seasons and lesser presence of Spirulina spp. was observed in many plain land reservoirs while
others with low anthropogenic pressure were sub-dominant with bacillariophyta, Nitzshia spp., Synedra spp. and Navicula spp.
and chlorophyta Scenedesmus spp. and Selenastrum spp. Blooms of Microcystis aeruginosa occurred in shallow plain reservoirs
receiving agricultural, industrial and municipal run-off during monsoon. Rain shadow reservoirs depicted early eutrophy stage
as estimated through Carlssons Trophic State Index, represented by species of two groups, chlorophyceae and myxophyceae,
distribution being influenced mostly by habitat characteristics. Principal component analysis (PCA) suggested that secchi disc
transparency and nutrients were important variables determining the ecological status of the reservoirs. The overall division
of the reservoirs is explained by species environmental relationship using BIOENV (Primer 6), which described the positive
correlation of temperature, specific conductivity and hardness to plankton composition and numerical abundance. Some plain
reservoirs move out of their group to assume a solitary position exhibiting different plankton composition with respect to
hydrological characteristics.
 
Publisher Indian Council of Agricultural Research, New Delhi
 
Date 2015
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/10530/1/IJF%2062.3_Rani%20Palaniswamy_1-13.pdf
Palaniswami, Rani and Manoharan, S and Mohan, Anjana (2015) Characterisation of tropical reservoirs in Tamil Nadu, India in terms of plankton assemblage using multivariate analysis. Indian Journal of Fisheries, 62 (3). pp. 1-13. ISSN 0970 - 6011