Ofoezie I E, Asaolu S O
Institute of Ecology and Environmental Studies, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria.
Bull World Health Organ. 1997;75(5):435-41.
The effect of different water discharge patterns from the artificial Oyan Reservoir in Ogun State, Nigeria, on water level fluctuations and on schistosomiasis transmission was investigated between August 1990 and March 1993 to determine the impact of water level regulation on schistosomiasis transmission and control. The results show that transmission was greatly influenced by the pattern of water discharge during the hot dry season (January-April). A high discharge during this period of no rainfall, high temperatures, and intense sunshine stimulated rapid water level fluctuations and lake draw-down, which led to significant reductions in all indices of schistosomiasis transmission, i.e. snail density, snail infection rates, human water contact patterns, and incidence of infection. Although these results support continuous water discharges from the reservoir during the hot dry season, this may run counter to current water management policies. Further investigation is therefore required to harmonize the potential benefits in this type of discharge pattern with the objectives of efficient water management in artificial reservoirs.
1990年8月至1993年3月期间，对尼日利亚奥贡州人工奥扬水库不同排水模式对水位波动和血吸虫病传播的影响进行了调查，以确定水位调节对血吸虫病传播和控制的影响。结果表明，在炎热干燥季节（1月至4月），排水模式对传播有很大影响。在这段无降雨、高温和强烈日照的时期，高排水量刺激了水位的快速波动和湖水下降，这导致血吸虫病传播的所有指标显著降低，即钉螺密度、钉螺感染率、人类与水接触模式以及感染发病率。尽管这些结果支持在炎热干燥季节从水库持续排水，但这可能与当前的水资源管理政策背道而驰。因此，需要进一步调查，以协调这种排水模式的潜在益处与人工水库高效水资源管理的目标。
