The dynamics of potamoplankton populations in the River Yamuna. (Limnological studies on the River Yamuna at Delhi, India Part II)
Archiv für Hydrobiologie Volume 73 Number 4 (1974), p. 492 - 517
published: Jul 9, 1974
ArtNo. ESP141007304001, Price: 29.00 €
The Yamuna River at Delhi, India, from February, 1958, through January, 1960, supported an abundant and diverse potamoplankton consisting of 124 genera or species of phytoplankton and 97 genera or species of zooplankton. Dominance of Bacillariophyceae in the phytoplankton seems to be a characteristic of the river under reference and confirms the statement of other workers on rivers. There is a definite increase in the Cyanophyceae group among phytoplankton and Protozoa and Rotifera among zooplankton in the most polluted stations. The plankton studies have shown that an increase in numbers of some entire groups of organisms can be used as indicative of sanitary conditions of water. In general, changes in phytoplankton and zooplankton were inversely related to the changes in discharge and turbidity. The greatest development of the potamoplankton occurred during the periods of low discharges and turbidity, and can be related best to ensuing increases in the "age of the water" and light penetration. Temperature and potamoplankton were directly related, but the influence of temperature was subordinate to the influence of discharge and turbidity. The nitrate and albuminoid-N concentration and seemingly the phosphate-concentration were increasingly related to phytoplankton yield. The highest oxygen saturation percentage and the lowest oxygen consumption were generally attained during the largest plankton yield.