The Effect of Tannery Effluent on the Colonization Rate of Plankters: A Microcosm Study

Authors : Yalavarthi Naga KOTESWARI, Ravichandran RAMANIBAI

Pages : 163-170

View : 18 | Download : 11

Publication Date : 2003-12-01

Article Type : Research Paper

Abstract :The present study describes a multispecies toxicity test that uses community level responses of plankton samples from a natural lake using polyurythane foam insert ignore into journalissuearticles values(PF); as artificial substrate. These substrates were suspended and left for a period of 14 days. Colonized substrates were then placed in a series of microcosms dosed with a gradient of tannery effluent from 1 to 15% concentration. The species composition and abundance of the planktonic communities in PF substrate with the exposure of 4 different concentration of tannery effluent insert ignore into journalissuearticles values(1%, 3%, 5% and 15%); were assessed on days 1, 3, 7, 14, 21 and 28. Species diversity and abundance in colonized PF substrate showed a significant difference in different effluent treatments. Similarly, an inverse relationship was noted between effluent dosage and species surviving in source PF substrate at the end of the experiment period.
Keywords : Microcosm, toxicity, colonization rate, sensitivity, endpoints