LONG-TERM ECOLOGICAL CHANGES AND THEIR IMPACT ON THE PLANKTON BIO DIVERSITY IN THE EUTROPHIC LAKE HUSSAINSAGAR, INDIAS.S. vUTUKURLP D. SAMUEL SUMAN RAJ, N. SREEDHAR CHARY AND Y. ANJANEYULU
Long-term ecological studies including physico-chemical characteristics, heavy metals and their impact on the plankton biodiversity are critically examined in the Lake Hussainsagar (780 24' and 780 29' latitudes and 170 24' and 17° 26' longitudes), Hyderabad, India that has been subjected to varying degrees of pollution and consequent eutrophication. The results revealed a marked decline in the species diversity and only pollution resistant species increased in number replacing the sensitive and freshwater indicating forms observed in the earlier studies. Persistence of heavy metals in high concentration is causing highly toxic conditions to various sensitive plankton species. Though the water quality of the lake improved reasonably over the last decade, nutrients like phosphates and nitrates still pose a problem.
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