Effect of altitude on hydrology, productivity and species richness in Kodayar - a tropical peninsular Indian aquatic system

To study effects of altitude, monthly sampling was undertaken from June 1993 to May 1996 in the upper Kodayar reservoir (1312 m ASL), the lower Kodayar (92 m ASL) and Azhakia Pandiapuram (plain) (Tamilnadu, India). Temperature decreased with elevation at a rate of 1 °C per 240 m; the thermal range a...

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Bibliographic Details
Published in:Hydrobiologia 2000-07, Vol.430 (1-3), p.33-57
Main Authors: Murugavel, P, Pandian, T J
Format: Article
Language:English
Subjects:
Alkalinity
Altitude
Aquatic environment
Chlorophyll
Dissolved oxygen
Dry season
Freshwater
Hydrology
India
Lakes
Phytoplankton
Population density
Productivity
Reservoirs
Species diversity
Species richness
Zooplankton
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Summary:To study effects of altitude, monthly sampling was undertaken from June 1993 to May 1996 in the upper Kodayar reservoir (1312 m ASL), the lower Kodayar (92 m ASL) and Azhakia Pandiapuram (plain) (Tamilnadu, India). Temperature decreased with elevation at a rate of 1 °C per 240 m; the thermal range also decreased with increasing altitude. The number of days and quantity of precipitation decreased from 161 days and 366 cm yr^sup -1^ in the upper Kodayar to 92 days and 127 cm yr^sup -1^ at the Azhakia Pandiapuram (APP). Transparency decreased from 1.5 m at the upper Kodayar to about 0.5 m at the APP. Dissolved oxygen increased with decreasing altitude but remained high (>7 mg l^sup -1^) in all the three systems. Throughout the investigation, the upper Kodayar reservoir (
ISSN:0018-8158
1573-5117
DOI:10.1023/A:1004069013459