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首页> 外文期刊>African Entomology >Response of the invasive cat's claw creeper, Macfadyena unguis-cati (Bignoniaceae), to simulated and actual defoliation by Charidotisauroguttata (Coleoptera: Chrysomelidae)
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Response of the invasive cat's claw creeper, Macfadyena unguis-cati (Bignoniaceae), to simulated and actual defoliation by Charidotisauroguttata (Coleoptera: Chrysomelidae)

机译：侵入性猫爪爬行者Macfadyena unguis-cati（Bignoniaceae）对Charidotisauroguttata（鞘翅目：金眼科）模拟和实际脱叶的响应

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摘要

Cat's claw creeper, Macfadyena unguis-cati (L.) Gentry (Bignoniaceae), introduced as an ornamental plant, has invaded several ecologically sensitive habitats in the higher rainfall regions of South Africa. Biological control was initiated with the release of the leaf-feeding tortoise beetle Charidotis auroguttata (Boheman) (Coleoptera: Chrysomelidae) in 1999. Although established at several field sites, population densities of the beetle have remained low with no assessment of impact to date. However, simulated herbivory studies in Australia revealed that severe and repeated defoliations could slow the weed's growth rate and its accumulation of biomass in the subterranean tubers. The aim of this study was to quantify the impact of medium (50 %) andhigh-intensity (100 %) defoliations by C. auroguttata, in relation to equivalent simulated damage, on the growth and biomass accumulation of M. unguis-cati. The trials were monitored for 16 weeks with repeated defoliations at two-week intervals. Despiteconsiderable variation in the response variables, plants that were defoliated by C. auroguttata, but not those defoliated mechanically, displayed reduced growth rates. However, significant decreases in stem length and numbers of nodes were demonstrated only after high-intensity beetle defoliations. Despite reductions in tuber biomass in the beetle-defoliated treatments, the differences were not significant, while only high-intensity beetle defoliations caused a significantly lower accumulation of totalplant biomass. Simulated herbivory was a poor predictor of insect damage in this study which suggested that C. auroguttata could prove damaging to M. unguis-cati, but only at high population densities. However, in field situations, synergism with a rangeof additional environmental stressors may increase the negative impact of feeding damage.
机译：作为观赏植物引入的猫爪爬行者Macfadyena unguis-cati（L.）Gentry（Bignoniaceae）入侵了南非雨量较高地区的几个对生态敏感的栖息地。 1999年，随着以叶为食的陆龟甲虫Charidotis auroguttata（Boheman）（鞘翅目：甲壳纲）的释放，开始了生物防治。尽管甲虫的种群密度在几个田间地点都已建立，但至今仍未评估其影响。然而，澳大利亚的草食动物研究表明，严重而反复的落叶可以减缓杂草的生长速度及其在地下块茎中生物量的积累。这项研究的目的是量化与等效的模拟损害有关的C. auroguttata中等（50％）和高强度（100％）脱叶对M. unguis-cati生长和生物量积累的影响。监测试验16周，每两周重复脱叶。尽管响应变量发生了显着变化，但被C. auroguttata脱叶的植物（而非机械脱叶的植物）显示出降低的生长速率。但是，只有在高强度甲虫脱叶后才证明茎长度和节数明显减少。尽管在甲虫脱叶处理中块茎生物量减少了，但差异并不明显，而只有高强度的甲虫脱叶导致全株生物量的积聚明显降低。在这项研究中，模拟的草食性不能很好地预测昆虫的危害，这表明C. auroguttata可以证明对M. unguis-cati具破坏性，但仅在高种群密度时才如此。但是，在田间情况下，与一系列其他环境压力源的协同作用可能会增加饲喂损害的负面影响。

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