Extent of Heavy Metal Accumulation in Sewage Irrigated Soils and Their Impact on Distribution of Earthworm Communities: Linking Chromium and Zinc Toxicity on Growth and Reproduction in Selected Earthworm Species.
V. Latha1*and P. Mahaboob Basha1
1Department of Zoology, Bangalore University, Bangalore, 560 056 India
http://dx.doi.org/10.12944/CWE.11.1.34
土壤生态系统受金属污染影响structure of soil invertebrate population(s) and dynamics leading to altered distribution of species. This study focuses on earthworm distribution in sewage irrigated agricultural lands around Bangalore. The occurrence of reported species from the sampled areas isEudrilus eugeniae,Lampito maurutii, Pontoscolex corethrurus, Polypheretima elongata, Perioynx excavatesandEisenia fetida.Laboratory studies conducted to evaluate feed ingestion rate and body mass changes in earthworms exposed to metal spiked soils revealed species specific pattern.Eudrilus eugeniaeandLampito maurutiishowed a steep increase in body weight, whilePontoscolex corethrurusexhibited decreased trend upon Zn exposure. Contrarily a significant (p<0.05) decline in body weight was evident in all the three species upon exposure to Cr spiked soils. The observed alterations in feeding and body mass index concomitantly influenced the reproductive parameters. Rate of hatchability and reproductive function found to be decreased in Cr spiked soils in all the three species studied. Contrarily, increased hatchability was observed inE.eugenieaandL.maurutiifollowed by a decrease rate inP.corethrurusupon exposure of Zn spiked soils. However, reproductive rate found to be increased inE.eugenieaandP.corethruruswith decreased trend inL.maurutii. Thus, use of sewage polluted water for irrigation purpose has led to increased soil metal concentration impacting earthworm physiology and distribution.
Heavy metal toxicity; Earthworm prevalence; Feeding and body mass changes; Reproductive parameters
Copy the following to cite this article:
Latha V, Basha P. M. Extent of Heavy Metal Accumulation in Sewage Irrigated Soils and Their Impact on Distribution of Earthworm Communities: Linking Chromium and Zinc Toxicity on Growth and Reproduction in Selected Earthworm Species . Curr World Environ 2016;11(1) DOI:http://dx.doi.org/10.12944/CWE.11.1.34
Copy the following to cite this URL:
Latha V, Basha P. M. Extent of Heavy Metal Accumulation in Sewage Irrigated Soils and Their Impact on Distribution of Earthworm Communities: Linking Chromium and Zinc Toxicity on Growth and Reproduction in Selected Earthworm Species. Curr World Environ 2016;11(1). Available from://www.a-i-l-s-a.com?p=890/
