As a common intertidal Pulmonata species,Siphonaria japonica(Donovan,1824)lays its egg ribbons on the intertidal rocky shores. Therefore, rainfall has potential effects on the embryonic development and larval hatch-ing of S. japonica. To investigate the effects of rainfall on the embryonic development and larval hatching of S.japonica,we examined the effects of simulated rainfall on the embryonic development,the cumulative number of larval hatching, and the value and occurrence time of hatching peak in the egg ribbons. We also analyzed the effects of natural rainfall on the cumulative number of larval hatching, the value and occurrence time of hatching peak in different stages of egg ribbons. These results indicated that simulated rainfall had pronounced impacts on the em-bryonic development and larval hatching of egg ribbons (P < 0.05). However, natural rainfall did not affect the cu-mulative number of larval hatching (P > 0.05), but dramatically accelerated the rate of larval emergence (P < 0.05). These results will provide the basic data for understanding the impacts of rainfall on the reproduction and popula-tion dynamics of intertidal gastropods.%作为常见的肺螺亚纲生物,日本菊花螺Siphonaria japonica(Donovan,1824)会将卵带产于潮间带岩石上, 因此会经常遭受降水的影响.为阐明降水对日本菊花螺胚胎发育和幼体孵化的影响, 本研究通过实验室模拟和野外原位取样相结合的方式分析了降水对卵带内胚胎发育状态、幼体累积孵化数、单位时间幼体孵化最高值和最高值出现时间的影响.结果表明: 实验室模拟降水会显著影响卵带胚胎发育和幼体孵化(P<0.05); 自然降水并不会影响幼体累积孵化数(P>0.05), 但会显著加快幼体孵化速率(P<0.05).
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