Department of Zoology, D.D.U. Gorakhpur University, Gorakhpur 273009, U.P., India.
J Water Health. 2010 Mar;8(1):109-15. doi: 10.2166/wh.2009.035.
Lymnaea acuminata breeds round the year. The effect of pH, temperature, dissolved oxygen, carbon dioxide, light/dark period and clean/polluted water on the fecundity, hatchability and survival of young snails of L. acuminata were studied. It was observed that these environmental variant abiotic factors caused a significant variation in fecundity, hatchability and survival of young snails. Maximum reproduction of this snail was observed in the months of March to May. A significant positive correlation (p<0.05) between D.O. (3.1-7.7 ppm)/pH (7.01-8.96) of water with fecundity (6.0-196.33/20 snails), hatchability (54.69-96.91%) and survival (61.3-95.86%) of young snails was observed for each month and each interval of 24-72 h. In contrast, a significant negative correlation between dissolved CO2 (4.6-16.6 ppm)/temperature (16-37 degrees C) of water was noted with fecundity, hatchability and survival of snails. Percent hatchability in the eggs in different regimens of water was between 96.91-54.69%. The hatching period was prolonged (2-14 days) in snail exposed to different groups of water compared to the control group (2-9 d). This study conclusively shows that variant abiotic factors in different months of the year can significantly alter the reproductive ability and development process in the snail Lymnaea acuminata.
锥实螺全年繁殖。研究了 pH 值、温度、溶解氧、二氧化碳、光照/黑暗期以及清洁/污染水对锥实螺幼螺的繁殖力、孵化率和存活率的影响。结果表明，这些环境变异性非生物因素导致幼螺的繁殖力、孵化率和存活率显著变化。这种蜗牛的最大繁殖期出现在 3 月至 5 月。在每个月和每 24-72 小时的间隔内，水中的溶解氧（3.1-7.7ppm）/pH 值（7.01-8.96）与幼螺的繁殖力（6.0-196.33/20 只）、孵化率（54.69-96.91%）和存活率（61.3-95.86%）呈显著正相关（p<0.05）。相比之下，水中溶解二氧化碳（4.6-16.6ppm）/温度（16-37°C）与蜗牛的繁殖力、孵化率和存活率呈显著负相关。不同水条件下的卵孵化率在 96.91%-54.69%之间。与对照组（2-9 天）相比，暴露于不同组水的蜗牛的孵化期延长（2-14 天）。这项研究明确表明，一年中不同月份的变异性非生物因素可以显著改变锥实螺的生殖能力和发育过程。
