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首頁(yè)> 美國(guó)衛(wèi)生研究院文獻(xiàn)>Annals of the Entomological Society of America >Competitive Outcomes of Aquatic Container Diptera Depend on Predation and Resource Levels
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Competitive Outcomes of Aquatic Container Diptera Depend on Predation and Resource Levels

機(jī)譯：水生容器雙翅類的競(jìng)爭(zhēng)結(jié)果取決于捕食和資源水平

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Resources and predation are both known to be important in structuring communities; however the strength of one factor may be affected by the intensity of the other. This study used a fully crossed factorial experiment in laboratory microcosms to examine the ability of a predator, Corethrella appendiculata (Grabham), and basal resources (leaf litter) to differentially affect two competing species of mosquito prey. Increased resources resulted in shorter developmental time and increased survivorship, mass, and population performance for both prey species, except when predation levels were high. Increased levels of predation and resources reduced the negative competitive effects of Aedes albopictus (Skuse) on Ochlerotatus triseriatus (Say). At low levels of resources and predation, the superior competitor, A. albopictus had the higher survivorship, and at high levels of resources and predation, the inferior competitor’s survival was greater. Predators in high-resource treatments emerged larger than those in low resources, suggesting the occurrence of a bottom-up cascade or alternative feeding method. This study suggests that survival and coexistence of the two prey species may depend on the interaction of resources and predation, in that high levels of predation are important for the coexistence of both species.
機(jī)譯：眾所周知，資源和掠奪對(duì)構(gòu)建社區(qū)至關(guān)重要。但是，一個(gè)因素的強(qiáng)度可能會(huì)受到另一個(gè)因素的強(qiáng)度的影響。這項(xiàng)研究在實(shí)驗(yàn)室縮影中使用了完全交叉的階乘實(shí)驗(yàn)，以檢驗(yàn)捕食者，闌尾Corethrella appendiculata（Grabham）和基礎(chǔ)資源（葉凋落物）對(duì)兩種競(jìng)爭(zhēng)性蚊子競(jìng)爭(zhēng)物種產(chǎn)生差異影響的能力。資源的增加導(dǎo)致兩種獵物物種的發(fā)育時(shí)間縮短，生存，質(zhì)量和種群數(shù)量增加，除非捕食水平很高。捕食水平和資源水平的提高減少了白紋伊蚊（Skuse）對(duì)Oslerotatus triseriatus（Say）的負(fù)面競(jìng)爭(zhēng)影響。在資源和捕食水平較低的情況下，優(yōu)勢(shì)競(jìng)爭(zhēng)者白粉蟻的存活率較高；在資源和捕食水平較高的情況下，劣等競(jìng)爭(zhēng)者的生存率更高。高資源處理的捕食者的出現(xiàn)比低資源處理的捕食者要大，這表明發(fā)生了自下而上的級(jí)聯(lián)或替代飼養(yǎng)方法。這項(xiàng)研究表明，兩個(gè)獵物物種的生存和共存可能取決于資源和捕食的相互作用，因?yàn)楦咚降牟妒硨?duì)于這兩個(gè)物種的共存很重要。

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