| Autor: |
Samman, J., Thomas, M. Pugh |
| Předmět: |
|
| Zdroj: |
International Journal of Environmental Studies; Jul78, Vol. 12 Issue 3, p207, 8p |
| Abstrakt: |
The 24-hour LC 50 of the nauplii of Thermocyclops hyalinus using Abate CE 200 solution was 0.23 ppm., while the 24-hour LC 50 of both the copepodite and adult stages was 0.2 ppm. The numbers of drifting zooplanktonic Microcrustacea in the White Volta increased in numbers during the months of March, April, May, June and July in the dry season. The increase in numbers in the post-sunset samples related to the vertical migration of the zooplankton in the reservoir upstream. The aerial weekly application of Abute CE 200 solutions at very high lethal concentrations did not seem to affect the Microcrustacea population probably because (a) Microcrustacea drifting into the reservoir from upstream sustained populations in the reservoir; (b) Microcrustacea living at the banks of the reservoir escaped the abate effect flowing downstream; and (c) spraying was done around noon, when the majority of the zooplankton population had migrated in the bottom of the reservoir. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
