Combined effects of extreme climatic events and elevation on nutritional quality and herbivory of Alpine plants.
Combined effects of extreme climatic events and elevation on nutritional quality and herbivory of Alpine plants.
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DOI：
10.1371/journal.pone.0093881
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Steffan-Dewenter I
中科院分区：
文献类型：
--
作者：
Leingärtner A;Hoiss B;Krauss J;Steffan-Dewenter I
由于植物质量的改变，例如叶片碳氮比和物候，气候极端事件可能导致植物-昆虫相互作用的转变或中断。然而，植物-草食相互作用对极端事件和气候梯度的响应很少被研究，尽管未来极端气候事件的频率和强度将会增加，而食草昆虫是一个高度多样化和功能重要的群体。在德国阿尔卑斯地区15个不同气候条件的草地上，建立了沿海拔梯度的重复气候变化实验，研究了不同气候条件下3个植物群落及其昆虫取食对极端事件（极端干旱、提前和延迟融雪）的响应。结果表明，碳氮比和草食的海拔变化与植物行纪和季节有关。禾草CN比随海拔升高而升高，豆科植物和其他草本植物CN比随海拔升高而降低。与我们的假设相反，极端气候事件对CN比率和草食性没有显著影响。因此，我们的研究表明，植物的营养品质和与食草昆虫的拮抗相互作用对季节性极端气候具有很强的抵抗力。在三个功能植物群落中，草食性随氮浓度的增加而增加。此外，CN比值的增加表明随着季节的推进，营养植物质量降低。虽然我们的研究结果没有揭示极端气候事件的直接影响，但植物行会沿着海拔方向的相反反应表明，植物群落内部的竞争相互作用可能在未来气候下发生变化，对植物-食草相互作用和植物群落组成产生未知的后果。
Climatic extreme events can cause the shift or disruption of plant-insect interactions due to altered plant quality, e.g. leaf carbon to nitrogen ratios, and phenology. However, the response of plant-herbivore interactions to extreme events and climatic gradients has been rarely studied, although climatic extremes will increase in frequency and intensity in the future and insect herbivores represent a highly diverse and functionally important group. We set up a replicated climate change experiment along elevational gradients in the German Alps to study the responses of three plant guilds and their herbivory by insects to extreme events (extreme drought, advanced and delayed snowmelt) versus control plots under different climatic conditions on 15 grassland sites. Our results indicate that elevational shifts in CN (carbon to nitrogen) ratios and herbivory depend on plant guild and season. CN ratios increased with altitude for grasses, but decreased for legumes and other forbs. In contrast to our hypotheses, extreme climatic events did not significantly affect CN ratios and herbivory. Thus, our study indicates that nutritional quality of plants and antagonistic interactions with insect herbivores are robust against seasonal climatic extremes. Across the three functional plant guilds, herbivory increased with nitrogen concentrations. Further, increased CN ratios indicate a reduction in nutritional plant quality with advancing season. Although our results revealed no direct effects of extreme climatic events, the opposing responses of plant guilds along elevation imply that competitive interactions within plant communities might change under future climates, with unknown consequences for plant-herbivore interactions and plant community composition.
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影响因子：
4.8
作者：
de Sassi, Claudio;Lewis, Owen T.;Tylianakis, Jason M.
通讯作者：
Tylianakis, Jason M.
影响因子：
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作者：
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作者：
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通讯作者：
KORNER, C