Do leaf traits shape herbivory in tropical montane rainforests? A multispecies approach

IF 2.7 3区 环境科学与生态学 Q2 ECOLOGY
Ecosphere Pub Date : 2024-10-14 DOI:10.1002/ecs2.70018
Jana E. Schön, Raya Keuth, Jürgen Homeier, Oliver Limberger, Jörg Bendix, Nina Farwig, Roland Brandl
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Abstract

The co-evolutionary arms race between herbivores and plants forces plants to evolve protection strategies that reduce the palatability of the plant modules attacked by the herbivores. These characteristics of traits have consequences for both the survival of plant individuals and the composition of plant communities. Thus, correlating traits of for instance leaves with herbivory is an important step toward understanding the dynamics of plant populations and communities. Traits can either be measured using conventional lab methods or recently developed spectral sensing techniques. We examined whether leaf traits of trees are related to herbivory in a multispecies approach. Furthermore, we explored whether leaf traits characterized by spectral sensing provide similar relations to herbivory as lab-based leaf traits. We established nine 1-ha square plots evenly distributed over three different forest types in Ecuadorian tropical montane rainforests where we estimated herbivory as the leaf area loss (in square centimeters) of 20 (±5) leaves sampled from the canopies of 380 tree individuals belonging to 51 tree species (7 ± 1 individuals/species) using lab- and spectral-sensing-based methods. For each methodological approach, we ran 100 linear mixed-effects models with all respective leaf traits as predictor and herbivory as response variables for data subsets containing one randomly selected tree individual of each species to estimate the range of the regression coefficients for each trait. Automated stepwise backward selections determined the frequency of each trait having an important influence on herbivory. We found no clear relations between leaf traits and herbivory for neither lab- nor spectral-sensing-based traits. A nested variance component analysis demonstrated that the observed variability was mainly due to the variation in trait concentrations between tree individuals of a species. Our results suggest that snapshot data lead to a mismatch between herbivory and the concentrations of traits during the peak of herbivory. Another explanation could be that environmental conditions or processes along the food web are more important in structuring herbivory than leaf traits.

Abstract Image

热带山地雨林中的食草动物是由叶片特征决定的吗?多物种方法
食草动物与植物之间的共同进化军备竞赛迫使植物进化出保护策略,以降低被食草动物攻击的植物模块的适口性。这些特征对植物个体的生存和植物群落的组成都有影响。因此,将叶片等的性状与食草动物相关联是了解植物种群和群落动态的重要一步。可以使用传统的实验室方法或最近开发的光谱传感技术来测量特征。我们采用多物种方法研究了树木的叶片特征是否与食草动物有关。此外,我们还探讨了光谱传感技术所表征的叶片性状是否与实验室测量的叶片性状具有类似的草食关系。我们在厄瓜多尔的热带山地雨林中建立了 9 个 1 公顷的方形地块,均匀分布在三种不同的森林类型中,在这些地块中,我们使用实验室方法和光谱传感方法对 51 个树种(7 ± 1 个树种)的 380 棵树的树冠中采样的 20 (± 5) 片树叶的叶面积损失(单位:平方厘米)进行了草食性估算。对于每种方法,我们都运行了 100 个线性混合效应模型,将所有相应的叶片性状作为预测变量,将草食性作为响应变量,这些数据子集包含随机选取的每个物种的一个树木个体,以估计每个性状的回归系数范围。自动逐步后向选择确定了对草食性有重要影响的每个性状的频率。我们发现,无论是基于实验室还是基于光谱感应的性状,叶片性状与草食性之间都没有明显的关系。嵌套变异成分分析表明,观察到的变异性主要是由于树种个体间性状浓度的差异造成的。我们的结果表明,快照数据导致草食高峰期的草食量与性状浓度不匹配。另一种解释可能是,与叶片性状相比,环境条件或食物网过程对草食结构的影响更为重要。
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来源期刊
Ecosphere
Ecosphere ECOLOGY-
CiteScore
4.70
自引率
3.70%
发文量
378
审稿时长
15 weeks
期刊介绍: The scope of Ecosphere is as broad as the science of ecology itself. The journal welcomes submissions from all sub-disciplines of ecological science, as well as interdisciplinary studies relating to ecology. The journal''s goal is to provide a rapid-publication, online-only, open-access alternative to ESA''s other journals, while maintaining the rigorous standards of peer review for which ESA publications are renowned.
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