酸性水对淡水螺类存活、生长与繁殖的影响

Effect of acidic water on survival, growth and reproduction of freshwater snails.

研究了酸性水对椭圆萝卜螺和铜锈环棱螺等淡水螺类存活、生长及繁殖的影响。结果表明,椭圆萝卜螺对低pH值的耐受能力,96小时LC_(50)值为pH3.96。pH值低于5.0时,淡水肺螺类产的卵袋数量较少,卵孵化时间较长,幼螺生长较缓慢。铜锈环棱螺仔螺在低pH(对照组)下生长到第35和45天时,其体长生长率分别为1.21和1.07％,而pH5.0组则仅有0.18和0.29％。pH5.5对淡水肺螺类无明显影响,pH3.0则不能生存。

Laboratory studies with Radix swinhoei and Bellamya aeruginosa show that R. swinhoei is tolerent toward low pH, its value being 3.96 for LC_(50) during 96 hours. When pH value is below 5.0, freshwater pulmonate snails produce less cocoons, their hatching period is longer, and the growth of Young snails is slower. At 35th and 45th day of growth, the growth rate of young B. aeruginosa is respectively 1.21 and 1.07% at low pH, and only 0.18 and 0.29％ at pH5.0, pH5.5 has no significant effect on freshwater-pulmonate snails, and pH3 induces their death.