Chemicals of predatory mosquitofish (Gambusia affinis) influence selection of oviposition site by Culex mosquitoes
Chemicals of predatory mosquitofish (Gambusia affinis) influence selection of oviposition site by Culex mosquitoes
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DOI：
10.1023/a:1015292827514
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发表时间：
2002-04-01
影响因子：
2.3
通讯作者：
Petranka, JW
中科院分区：
文献类型：
--
作者：
Angelon, KA;Petranka, JW
产卵昆虫可能会避免水生场所，那里有高捕食风险，他们的后代，但调解回避行为的近端机制解决不好。我们进行了一项实验，以确定蚊子是否会减少产卵率在池含有化学物质的食蚊鱼（食蚊鱼affinis），一个贪婪的捕食者，被广泛用于控制蚊子。实验处理包括含有已知浓度的鱼类化学品（低，中，高）或没有鱼类化学品（对照）的室外游泳池。采用随机区组设计，以蚊幼虫数量作为反应变量，估算相对产卵率。尖音库蚊复合体的成员是池的主要殖民者。每个池的幼虫的平均数量不同的治疗（P = 0.026），约三倍以上的控制池相比，接受中等和高浓度的鱼类化学品。两两比较表明，只有中等和高治疗显着不同的控制，这表明存在一个阈值浓度低于蚊子不能可靠地检测捕食者。我们的数据表明，食蚊鱼在控制蚊子的有效性可能会受到损害，如果成年蚊子对鱼类放养作出反应，转移到附近的繁殖地点，缺乏鱼类。我们讨论了这些新发现的背景下，在生物控制计划中使用食蚊鱼的问题。
Ovipositing insects may avoid aquatic sites where there is high predation risk to their offspring, but the proximate mechanisms that mediate avoidance behavior are poorly resolved. We conducted an experiment to determine whether mosquitoes would reduce oviposition rates in pools containing chemicals of the mosquitofish (Gambusia affinis), a voracious predator that is widely employed to control mosquitoes. Experimental treatments consisted of outdoor pools that contained known concentrations of fish chemicals (low, medium, or high) or no fish chemicals (control). The pools were arranged in a randomized block design, and the number of mosquito larvae in each pool served as the response variable to estimate relative oviposition rate. Members of the Culex pipiens complex were the main colonizers of the pools. The mean number of larvae per pool differed among treatments (P = 0.026) and was about three times greater in control pools compared with those receiving medium and high concentrations of fish chemicals. Pairwise comparisons indicate that only medium and high treatments differed significantly from controls, suggesting that a threshold concentration exists below which mosquitoes cannot reliably detect predators. Our data suggest that the effectiveness of Gambusia affinis in controlling mosquitoes may be compromised if adult mosquitoes respond to fish stocking by shifting to nearby breeding sites that lack fish. We discuss issues concerning the use of Gambusia in biological control programs within the context of these new findings.