Evaluation of the Res-ponses of a Wetland, Tropical Earthworm to Heavy Metal Contaminated Soil
International Journal of Environmental Monitoring and Analysis
Volume 1, Issue 2, April 2013, Pages: 47-52
Received: Mar. 29, 2013; Published: Apr. 2, 2013
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Authors
Ebenezer Olasunkanmi Dada, Department of Cell Biology and Genetics, University of Lagos, Akoka, Yaba, Lagos
Kelechi Longinus Njoku, Department of Cell Biology and Genetics, University of Lagos, Akoka, Yaba, Lagos
Akinniyi Adediran Osuntoki, Department of Biochemistry, University of Lagos, Akoka, Yaba, Lagos
Modupe Olatunde Akinola, Department of Cell Biology and Genetics, University of Lagos, Akoka, Yaba, Lagos
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Abstract
In view of the global importance of wetlands in providing food and income for millions of people through agricultural activities, efforts should be geared toward identifying appropriate biomonitoring organisms for them. This study investigated the mortality and burrowing responses of Libyodrilus violaceus earthworm to heavy metals in the laboratory. The worms were subjected to heavy metal spiked soil in graded concentrations following the procedure recommended by the Organization for Economic Cooperation and Development for a period of 14 days. Zn had the highest significant mean lethal effect (6.35±4.04) on this species, followed by the mixtures of Zn, Cd (5.90±5.05); Zn, Pb, Cd (5.40±4.5); Zn, Pb (5.05±4.37), in that order. The median lethal concentration (LC 50) values for zinc (Zn), lead (Pb), and cadmium (Cd) obtained from the study stood at 520.06, 1551.55, and 706.66 mg/kg soil respectively. The species also showed inhibited burrowing responses to these metals in individual and combined concentrations. It is concluded that L. violaceus should be a candidate for con-sideration in assessing the health of wetland soils.
Keywords
Biomonitoring, Burrowing, Libyodrilus Violaceus, Mortality, Pollution
To cite this article
Ebenezer Olasunkanmi Dada, Kelechi Longinus Njoku, Akinniyi Adediran Osuntoki, Modupe Olatunde Akinola, Evaluation of the Res-ponses of a Wetland, Tropical Earthworm to Heavy Metal Contaminated Soil, International Journal of Environmental Monitoring and Analysis. Vol. 1, No. 2, 2013, pp. 47-52. doi: 10.11648/j.ijema.20130102.12
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