The role of amphibian prey in the diet and growth of giant water bug nymphs in Japanese rice fields
The role of amphibian prey in the diet and growth of giant water bug nymphs in Japanese rice fields
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两栖类猎物在日本稻田巨型水蝽若虫的饮食和生长中的作用
DOI：
10.1007/s10144-007-0058-0
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发表时间：
2007
影响因子：
1.7
通讯作者：
F. Nakasuji
中科院分区：
文献类型：
--
作者：
S. Ohba;H. Miyasaka;F. Nakasuji
依赖于特定被捕食动物的捕食性昆虫通常受到被捕食动物数量的调节。巨型水蝽的若虫Kirkaldyia(=Lethocerus)deyrolli（异翅目：Belostomatidae）是被认为是以蝌蚪为食的专家的掠食者。我们通过量化龄期丰度并分析三个地区水稻灌溉期间捕获的猎物和猎物相对丰度，研究了水生若虫的个体发育饮食变化。我们还评估了饲养实验中主要猎物（蝌蚪、青蛙和蜻蜓若虫）对每个若虫阶段特定生长速率的贡献。 K的一至三龄若虫。无论猎物可用性如何差异，主要以蝌蚪为食。随后的第四龄和第五龄若虫从蝌蚪转移到每个稻田内的其他被捕食动物。饲养实验表明，与喂养其他猎物（青蛙和蜻蜓目若虫）的若虫相比，提供蝌蚪的巨型水蝽若虫在除最后阶段外的所有若虫阶段都具有更高的特定生长率。 youngK的出现。蝌蚪的出现似乎与稻田中蝌蚪大量繁殖的时期相一致。食用蝌蚪对于若虫在不稳定的临时栖息地完成其幼虫发育似乎很重要。
Predatory insects that depend upon particular prey animals are commonly regulated by the prey animal’s abundance. Nymphs of the giant water bugKirkaldyia(=Lethocerus)deyrolli(Heteroptera: Belostomatidae) are predators regarded as specialists in feeding on tadpoles. We studied the ontogenetic diet shift of aquatic nymphs by quantifying instar abundance and by analyzing captured prey and prey relative abundance during the period of rice irrigation in three localities. We also evaluated the contribution of major prey items (tadpoles, frogs, and Odonata nymphs) on specific growth rates of each nymphal stage in a rearing experiment. First to third-instar nymphs ofK. deyrollifed mainly on tadpoles, regardless of differences in prey availability. Nymphs of subsequent fourth and fifth instar stages shifted from tadpoles to other prey animals within each rice field. A rearing experiment demonstrated that giant water bug nymphs provided with tadpoles had greater specific growth rates at all nymphal stages, except for the final stage, than nymphs fed other prey (frogs and Odonata nymphs). The emergence of youngK. deyrollinymphs seemed to coincide with the period during which tadpoles became abundant in the rice fields. Consumption of tadpoles seems important to allow the nymph to complete its larval development in an unstable temporary habitat.