Host plant architecture affects the costs of dropping behaviour in Phaedon brassicae (Coleoptera: Chrysomelidae)
Host plant architecture affects the costs of dropping behaviour in Phaedon brassicae (Coleoptera: Chrysomelidae)
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DOI：
10.1007/s13355-018-0582-8
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发表时间：
2018-11-01
影响因子：
1.3
通讯作者：
Sugiura, Shinji
中科院分区：
文献类型：
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作者：
Matsubara, Satoru;Sugiura, Shinji
植食性昆虫通过掉落来逃避捕食者。然而，如果它们掉到地上，它们就必须返回寄主植物。当昆虫从上面的叶子上掉落时，大椭圆形叶子可以充当安全网。为了阐明叶子形状对昆虫掉落地点的影响，我们研究了 Phaedon bassicae（鞘翅目：叶甲科）在三种寄主植物（白萝卜、白菜和大白菜）上的掉落行为。白萝卜植物的叶子是裂开的，而白菜和大白菜植物的叶子是椭圆形的。当用镊子戳时，幼虫比成虫掉落的频率要低。不同寄主植物掉落到地面的个体比例也不同。白萝卜腹侧（背面）叶表面的幼虫和成虫经常通过下面叶子的裂缝掉落到地面。然而，白菜和大白菜叶腹表面的幼虫和成虫经常掉落到下面的叶子上。大多数掉落地面的幼虫和成虫最终回到了寄主植物中。然而，幼虫的返回时间比成虫更长。因此，从萝卜叶子上掉落的成本高于从其他作物物种的叶子上掉落的成本。
Phytophagous insects escape from predators by dropping. However, if they drop to the ground, they must then return to the host plants. Large oval leaves may serve as safety nets when insects drop from overlying leaves. To clarify the effects of leaf shape on the sites to which insects drop, we investigated the dropping behaviour of Phaedon brassicae (Coleoptera: Chrysomelidae) on three host plants (daikon, bok choy, and Chinese cabbage). Daikon plants have cleft leaves, whereas bok choy and Chinese cabbage plants have oval leaves. When poked with forceps, larvae dropped less frequently than adults. The proportions of individuals dropping to the ground also differed among host plants. Both larvae and adults on the ventral (abaxial) leaf surfaces of daikon frequently dropped to the ground via clefts in the underlying leaves. However, larvae and adults on the ventral leaf surfaces of bok choy and Chinese cabbage frequently dropped to underlying leaves. Most larvae and adults that dropped to the ground finally returned to host plants. However, the return times were longer for larvae than adults. Therefore, the cost of dropping from daikon leaves was higher than were the costs of dropping from leaves of other crop species.