Garcia R G
Bull World Health Organ. 1972;47(1):59-70.
Ecological investigations were made of habitats containing natural populations of the snail Oncomelania hupensis quadrasi and of habitats free from the snail in the island of Leyte, Philippines. This species of snail is a vector of Schistosoma japonicum in the Philippines. Snail-infested habitats had dissolved oxygen levels of 3.8-9.85 ppm but snail-free habitats had levels of only 0.08-3.6 ppm. Snail-infested habitats were less polluted by organic matter than habitats that were snail-free. Larger numbers of chlorophyll-bearing algae were present in both the water and the soil of snail-infested habitats. Other factors, including temperature, pH, hydrogen carbonate alkalinity, and relative humidity, were also investigated.
在菲律宾莱特岛,对含有拟钉螺自然种群的栖息地以及无螺栖息地进行了生态调查。这种蜗牛是菲律宾日本血吸虫的传播媒介。有螺栖息地的溶解氧水平为3.8 - 9.85 ppm,而无螺栖息地的溶解氧水平仅为0.08 - 3.6 ppm。有螺栖息地受有机物污染的程度低于无螺栖息地。在有螺栖息地的水和土壤中都存在大量含叶绿素的藻类。还对包括温度、pH值、碳酸氢盐碱度和相对湿度在内的其他因素进行了调查。