Spider cues stimulate feeding, weight gain and survival of crickets
Spider cues stimulate feeding, weight gain and survival of crickets
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DOI：
10.1111/een.12131
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发表时间：
2014-12-01
影响因子：
2.2
通讯作者：
Entling, Martin H.
中科院分区：
文献类型：
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作者：
Bucher, Roman;Binz, Hellena;Entling, Martin H.
1.为了避免被捕食，猎物经常会在遇到捕食者存在的线索时改变它们的行为。这种行为变化应能提高个体生存率，但可能需要消耗大量能量。这应该会耗尽猎物的能量储备，除非它增加食物摄入量。2.这些假设进行了研究，通过两个微观实验。在第一个实验中，蟋蟀被饲养在先前被蜘蛛占据的植物上或对照植物上。3天后，定量测定蟋蟀的叶片消耗量和体重增加。在第二个实验中，蟋蟀在有或没有蜘蛛线索的情况下被饲养了30天。然后添加蜘蛛，并在24小时内记录蟋蟀的捕食。3.先前经历过蜘蛛线索的蟋蟀在避免捕食方面更成功。此外，在捕食风险下的蟋蟀倾向于增加觅食在第一个微观世界的实验，并获得更多的重量在第二个微观世界的实验。4.结果表明，捕食线索的先前经验降低捕食率。此外，他们认为蟋蟀能够补偿由反捕食行为引起的能量需求增加。在更自然的情况下，移动到无提示的植物可能会发挥额外的作用。
1. To avoid predation, prey often change their behaviour upon encountering cues of predator presence. Such behavioural changes should enhance individual survival, but are likely to be energy-demanding. This should deplete energy reserves of the prey, unless it increases food intake. 2. These hypotheses were studied by conducting two microcosm experiments. In the first, crickets were kept on plants previously occupied by a spider or on control plants. After 3days leaf consumption and weight gain of the crickets were quantified. In the second experiment, crickets were kept in the presence or absence of spider cues for 3days. Spiders were then added and predation of the crickets was recorded during 24h. 3. Crickets that had previously experienced spider cues were more successful in avoiding predation. Moreover, crickets under predation risk tended to increase foraging in the first microcosm experiment and gained more weight in the second microcosm experiment. 4. The results demonstrate that previous experience of predator cues decreases predation rate. Furthermore, they suggest that crickets are able to compensate for increased energy demands caused by antipredator behaviour. In more natural situations, moving to cue-free plants may play an addition role.