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首页> 外文期刊>Journal of Molluscan Studies >Predation on hardest molluscan eggs by confamilial snails (Neritidae) and its potential significance in egg-laying site selection
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Predation on hardest molluscan eggs by confamilial snails (Neritidae) and its potential significance in egg-laying site selection

机译：共生蜗牛对硬质软体动物卵的捕食及其在产卵位点选择中的潜在意义

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摘要

Neritid snails (Gastropoda: Neritimorpha) protect their eggs in a hard capsule, of tough conchiolin, reinforced by mineral particles derived from the faeces and stored in a special sac near the anus and oviduct opening. Predation on this arguably hardest of molluscan egg capsule is described and illustrated here; neritids of the freshwater to brackish-water genera Clithon and Vittina, generally classified as herbivores, feed facultatively on the eggs of various confamilial species after breaking the reinforced capsule lid by means of prolonged radular rasping. Intensive predation pressure by these common inhabitants in Indo-West Pacific coastal streams may have given rise to the remarkable egg-laying behaviour of Neritina on the shells of other living snails. Our laboratory examination showed that Neritina species deposited clusters of egg capsules more frequently on the living shell than on other substrates, and that the predation rate was significantly lower on this moving 'nursery'. Predation rate was even lower on the small egg capsules of Clithon and Vittina themselves, which were deposited one by one in the depressions on the rough surfaces of stones.
机译：Neritid蜗牛（Gastropoda：Neritimorpha）将鸡蛋包裹在坚硬的贝壳类硬胶囊中，并由粪便中的矿物质颗粒增强并储存在肛门和输卵管开口附近的特殊囊中，以保护卵。这里描述并举例说明了这种可能最坚硬的软体动物卵囊的捕食。淡水到微咸水属的克利斯顿和维提纳属（通常被称为草食动物）的种属，通过长时间的胚根打碎破坏了增强的囊盖后，以各种同种动物的卵为食。这些普通居民在印度洋-西太平洋沿岸河流的强烈捕食压力可能引起了Neritina在其他蜗牛壳上的显着产卵行为。我们的实验室检查表明，Neritina物种比其他基质更频繁地在活壳上沉积卵囊簇，并且这种移动“育苗”的捕食率明显更低。克莉森（Clithon）和维提纳（Vittina）本身的小卵囊的捕食率甚至更低，它们被逐一沉积在石头粗糙表面的凹陷处。

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