Black flies, vectors of Onchocercavolvulus, are known to colonize fast flowing sections of rivers.A study on aspects of ecology of immature forms of black flies was conducted at River Mada. Larvae and Pupae of the Gen...Black flies, vectors of Onchocercavolvulus, are known to colonize fast flowing sections of rivers.A study on aspects of ecology of immature forms of black flies was conducted at River Mada. Larvae and Pupae of the Genus: Simulium were prospected on natural substrates found at various water currents along the course of the river over a 12-month period. Larvae of six speciesand pupae of three species were identified colonizing different substrates in the river. A total of 443 larvae and 142 pupae were collected, and thepeak month of collection was April. 405 (91.4%) larvae were identified as S.damnosum sl while 38 (8.6%) comprised S. adersi, S.hargreavesi, S.cervicornotum, S. bovisand S.vorax. 110 (77.5%) of the pupae collected were S.damnosumsl while 32 (22.5%) were S.adersi, and S.hargreavesi. The larvae unlike pupae appeared to be non discriminatory in substrate colonization and current preference. Paucity of the population of immature forms is observed and attributed primarily to scarcity of suitable substrates and other factors also discussed herein.展开更多
Environment history of Mada Lake was retrieved based on literatures about this area.According to 20 years (1974-1995) monitoring on the water quality in the Mada lake,the history and present status of water pollution ...Environment history of Mada Lake was retrieved based on literatures about this area.According to 20 years (1974-1995) monitoring on the water quality in the Mada lake,the history and present status of water pollution in this lake was evaluated,and the ecological destruction process was studied.Ecological restoration model and strategies were proposed for the polluted Mada Lake,and the consequence after 5 years of rehabilitation was also predicted.展开更多
文摘Black flies, vectors of Onchocercavolvulus, are known to colonize fast flowing sections of rivers.A study on aspects of ecology of immature forms of black flies was conducted at River Mada. Larvae and Pupae of the Genus: Simulium were prospected on natural substrates found at various water currents along the course of the river over a 12-month period. Larvae of six speciesand pupae of three species were identified colonizing different substrates in the river. A total of 443 larvae and 142 pupae were collected, and thepeak month of collection was April. 405 (91.4%) larvae were identified as S.damnosum sl while 38 (8.6%) comprised S. adersi, S.hargreavesi, S.cervicornotum, S. bovisand S.vorax. 110 (77.5%) of the pupae collected were S.damnosumsl while 32 (22.5%) were S.adersi, and S.hargreavesi. The larvae unlike pupae appeared to be non discriminatory in substrate colonization and current preference. Paucity of the population of immature forms is observed and attributed primarily to scarcity of suitable substrates and other factors also discussed herein.
文摘Environment history of Mada Lake was retrieved based on literatures about this area.According to 20 years (1974-1995) monitoring on the water quality in the Mada lake,the history and present status of water pollution in this lake was evaluated,and the ecological destruction process was studied.Ecological restoration model and strategies were proposed for the polluted Mada Lake,and the consequence after 5 years of rehabilitation was also predicted.
