Intraguild predation among the hoverfly Episyrphus balteatus de Geer (Diptera: Syrphidae) and other aphidophagous predators
Intraguild predation among the hoverfly Episyrphus balteatus de Geer (Diptera: Syrphidae) and other aphidophagous predators
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DOI：
10.1006/bcon.2000.0895
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发表时间：
2001-03-01
影响因子：
4.2
通讯作者：
Poehling, HM
中科院分区：
文献类型：
--
作者：
Hindayana, D;Meyhöfer, R;Poehling, HM
食蚜性捕食者争夺相同的猎物物种。在它们的觅食活动中，它们经常遇到异种的蚜虫捕食者。这些情况可能导致公会内部的捕食，并可能扰乱生物防治努力，以防止在一个以上的捕食者种类存在的蚜虫。本文研究了菜蛾Eisyrphus balteatus de Geer幼虫的行为及其与其他三种捕食性天敌的相互作用：七星瓢虫Coccinella Septempot tata L.，草食草蝇Chrysopla carnea Stephens和麦长管蚜Aphidoletesaphidimyza(Rondani)。种间相互作用：在不同大小的竞技场和有额外的行会猎物存在的情况下，研究捕食者之间的相互作用。白纹伊蚊幼虫与其他捕食者相互作用的结果主要取决于竞争对手的相对身体大小。相对较大的个体充当公会内的捕食者，而相对较小的个体则成为公会内的猎物。白纹伊蚊的卵和一、二龄幼虫极易被其他捕食者捕食，而其蛹只被肉食性幼虫捕食。Ahidimyza和E.balteatus之间的相互作用是不对称的，并且总是偏向后者。无论竞技场的大小或是否存在会外猎物，白纹伊蚊的卵和一龄和二龄幼虫都会持续进行行内捕食。但对三龄幼虫的捕食频率显著降低。这项研究表明，同一物种既可以是行内捕食者，也可以是行内捕食者。因此，要想在生物防治上取得成功，必须仔细选择捕食性天敌的组合。(C)2001年学术出版社。
Aphidophagous predators compete for the same prey species. During their foraging activity they frequently encounter heterospecific aphid predators. These situations can lead to intraguild predation and may disrupt biological control efforts against aphids where more than one predator species is present. We investigated the behavior of larvae of the hoverfly Episyrphus balteatus de Geer and its interaction with three other aphid predators: the ladybird Coccinella septempunctata L., the lacewing Chrysoperla carnea Stephens, and the gall midge Aphidoletes aphidimyza (Rondani). Interspecific interactions: between predators were examined in arenas of different sizes and in the presence of extra-guild-prey. The outcome of interactions between E. balteatus larvae and the other predators depended predominantly on the relative body size of the competitors. Relatively large individuals acted as intraguild predators, while relatively smaller individuals became intraguild prey. Eggs and first- as well as second-instar larvae of E. balteatus were highly susceptible to predation by all other predators, whereas pupae of E. balteatus were preyed upon only by the larvae of C. carnea. Interactions between A. aphidimyza and E. balteatus were asymmetric and always favored the latter. Eggs and first- as well as second-instar larvae of E. balteatus sustained intraguild predation irrespective of the size of the arena or the presence of extraguild prey. However, the frequency of predation on third-instar larvae of E. balteatus was significantly reduced. This study indicated that the same species can be both intraguild predator and intraguild prey. It is suggested that combinations of predators must be carefully chosen for success in biological control of aphids. (C) 2001 Academic Press.