Yarahmadi, A. (2012) Effect of Diazinon and Carbaryl on Growth and reproduction of freshwater Rotifer (Brachionus calyciflorus) Isolated from Sistan’s water resources. Masters thesis, University of Zabol.
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Abstract
The use of insecticides and herbicides is increasing very rapidly in agriculture and pisciculture in order to control unwanted insects and weeds. Diazinon and carbaryl are commonly used insecticides in Sistan to eradicate insect pests. Rotifers, especially Brachionus calyciflorus and B. plicatilis are among the most favorable test animals in aquatic toxicology. In this study, effects of different concentrations of diazinon and carbaryl on growth and reproduction of the rotifer B.calyciflorus Isolated from Sistan’s water resources were studied by 7-d tests. We quantified the population level responses of Brachionus caluciflorus exposed separately to five different concentrations of diazinon (0.02, 0.2, 2.5, 5 and 10 ppm), and carbaryl (1, 10, 100, 200, and 400 ppb) at 25±1 ْ c and under an algal food density of 1-1.5 × 106 cells/ml of Chlorella vulgaris. We derived population density (per day), population growth rate (r), ratio ovogerous female to non-ovigerous females, ratio mictic females to amictic females and hatching rate of resting eggs in both controls and in pesticide treatments. The results showed that Compared to controls both diazinon at 0.02- 0.2 ppm and carbaryl at all tested concentrations in all tested days decreased the population density and specific growth rate. Diazinon at 0.02- 0.2 ppm and carbaryl at all tested concentration increased both ratio ovigerous females/ non-ovigerous females and mictic females/ amictic females. Diazinon at 0.02- 0.2 ppm and carbaryl at all tested concentrations decreased the hatching rate of resting eggs of rotifers.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | Diazinon, Carbaryl, rotifer, Brachionus calyciflorus, specific growth rate |
| Subjects: | S Agriculture > SH Aquaculture. Fisheries. Angling |
| Depositing User: | admin admin1 admin2 |
| Date Deposited: | 11 Apr 2016 04:16 |
| Last Modified: | 11 Apr 2016 04:16 |
| URI: | http://eprints.uoz.ac.ir/id/eprint/268 |
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