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目的研究全球气候变暖对中国大陆钉螺分布的潜在影响,探讨影响云南滇川亚种钉螺适生性的生态因子之一的越夏致死高温。方法对采自云南山区的滇川亚种云南地理株钉螺,采用实验室模拟自然环境逐步改变温度的方法 ,测定钉螺的越夏致死高温。结果干燥和潮湿环境中的钉螺的半数致死高温(LT50)分别为40.041℃(95%可信区间为39.424～40.680℃)和41.230℃(95%可信区间为40.430～42.190℃)。36℃以上高温(X)和钉螺死亡率(Y)间分别可拟合logistic曲线的Y=101/(1+e42.274-1.064X)(F=116.422,P<0.01)和Y潮=101/(1+e39.926-0.978X)(F=65.125,P<0.01)。结论处于干燥环境中的钉螺比在潮湿环境中,对极限高温的耐受性更弱些。
Aim To study the potential impact of global warming on snail distribution in mainland China and investigate the lethal summer heat of one of the ecological factors that affect the adaptability of snails in Yunnan and Sichuan subspecies. Methods Oncomelania hupensis collected from Yunnan Geography Strains of Yunnan-Yunnan subspecies Yunnan Province was used to simulate the gradual temperature change of snails by simulating the natural environment in laboratory. Results The LT50 values of snails in dry and humid environments were 40.041 ℃ (95% confidence interval 39.424-40.680 ℃) and 41.230 ℃ (95% confidence interval 40.430-42.190 ℃), respectively. The logistic curve Y = 101 / (1 + e42.274-1.064X) (F = 116.422, P <0.01) and Y wave = 101 /(1+e39.926-0.978X)(F=65.125,P<0.01). Conclusion Snails in a dry environment are less tolerant of extreme high temperatures than in humid environments.