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首页> 外文期刊>Journal of Insect Conservation >Effect of loach consumption on the reproduction of giant water bug Kirkaldyia deyrolli: dietary selection, reproductive performance, and nutritional evaluation
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Effect of loach consumption on the reproduction of giant water bug Kirkaldyia deyrolli: dietary selection, reproductive performance, and nutritional evaluation

机译：泥ach的摄入对巨型水bug克氏原核藻繁殖的影响：饮食选择，繁殖性能和营养评估

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摘要

Rice fields provide major habitats for lentic aquatic insects including the giant water bug Kirkaldyia (=Lethocerus) deyrolli (Heteroptera: Belostomatidae) in Japan. Previous researchers have emphasized that conserving populations of the frogs, Hyla japonicus and Rana nigromaculata, is very important for preserving K. deyrolli because these frogs were found to be a major component of the diet of K. deyrolli adults. However, these previous studies were carried out in rice fields with no loaches, Misgurnus anguillicaudatus, which were probably been inhabited by loaches in the past. A series of field surveys and laboratory experiments were conducted to determine the dietary preference of K. deyrolli adults for loaches, frogs, and aquatic insects; the reproductive effects of consuming these foods; and their protein content. In the rice fields, K. deyrolli adults ate loaches when they were available. When the three prey species (frog: R. nigromaculata, loach: M. anguillicaudatus, and dragonfly: Orthetrum albistylum speciosum) were supplied in laboratory conditions, K. deyrolli adults ate more loaches than frogs or dragonflies. In addition, K. deyrolli adults provided with loaches or frogs laid more egg masses within the limited breeding season than when provided with dragonflies. The edible parts of the loach bodies were the largest of the three prey types. It is possible that K. deyrolli adults have been forced to eat frogs due to reductions in the population density of loaches because modern rice cultivation obstructs loach migration routes and reduces their spawning grounds.
机译：稻田为片状水生昆虫提供了主要栖息地，其中包括日本的大型水虫科克迪亚（= Lethocerus）deyrolli（Heteroptera：Belostomatidae）。以前的研究人员曾强调，保护青蛙，日本雨蛙和黑蛙（Rana nigromaculata）种群对于保存K. deyrolli非常重要，因为发现这些青蛙是K. deyrolli成年饮食的主要组成部分。但是，这些先前的研究是在没有泥ache的水稻田中进行的，Misgurnus anguillicaudatus过去可能是泥ache的栖息地。进行了一系列的实地调查和实验室实验，以确定K. deyrolli成虫对泥ache，青蛙和水生昆虫的饮食偏好。食用这些食物对生殖的影响；及其蛋白质含量。在稻田中，K。deyrolli成年人在有食时会吃泥lo。当在实验室条件下提供三种猎物（青蛙：R。nigromaculata，泥ach：M。anguillicaudatus和蜻蜓：Orthetrum albistylum speciosum）时，K。deyrolli的成虫比青蛙或蜻蜓吃得更多。此外，在有限的繁殖季节，提供泥ache或青蛙的K. deyrolli成虫产卵量要大于提供蜻蜓的产卵量。泥ach体的可食部分是三种猎物中最大的。由于现代水稻的种植阻碍了泥ach的迁徙路线并减少了它们的产卵地，因此由于泥the的种群密度降低，导致K. deyrolli成虫被迫吃了青蛙。

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