Neighbouring tree effects on leaf herbivory: Insect specialisation matters more than host plant leaf traits
Neighbouring tree effects on leaf herbivory: Insect specialisation matters more than host plant leaf traits
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DOI：
10.1111/1365-2745.14228
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发表时间：
2023-11-22
影响因子：
5.5
通讯作者：
Hao，Zhanqing
中科院分区：
文献类型：
--
作者：
Jia，Shihong;Yang，Xiaochao;Hao，Zhanqing
昆虫食草性在植物种群和群落结构的调节中起着至关重要的作用。尽管昆虫食草性的强度随着邻近树木的多样性和身份的不同而不同，但昆虫协会和寄主植物的叶片特征在多大程度上调节了这种关系，特别是在不同的天然林中。在本研究中，我们通过咀嚼和挖掘暖温带山地森林中9种落叶树木的442棵树苗来测量叶片食草性。我们调查了邻近树木，并测量了5个已知的影响树苗食草性的叶片性状(即比叶面积-SLA，厚度，碳氮比-C：N比，钠-钠和硅-硅含量)。只有采叶昆虫的食草性受到邻近树木的身份和多样性的影响。具体地说，潜叶蛾的发生率随着邻近树木的系统发育多样性的增加而下降，随着焦点树附近的同种成虫密度的增加而增加。此外，病斑幼树叶片中硅的含量与叶片的食草性呈正相关，且随叶片中C/N比的增加，叶片的食草性降低。与我们的假设相反，焦点树苗的叶子特征并不是树木多样性和昆虫食草性之间的功能联系。综合：总体而言，这项研究强调了考虑昆虫草食动物的专门化在理解邻近树木的多样性和身份对昆虫食草性强度的影响方面的重要性。
Insect herbivory plays a critical role in the regulation of plant populations and community structures. Although the strength of insect herbivory varies with neighbouring tree diversity and identity, it is not clear to what extent insect guilds and leaf traits of host plants mediate the relationships, particularly in diverse natural forests.In this study, we measured leaf herbivory by chewing and mining insect herbivores in 442 saplings of nine species of deciduous trees in a warm‐temperate montane forest. We censused neighbouring trees and measured five leaf traits known to influence herbivory (i.e. specific leaf area‐SLA, thickness, carbon: nitrogen ratio‐C:N ratio, sodium‐Na and silicon‐Si content) on a subset of saplings.Only herbivory by leaf‐mining insects was influenced by the identity and diversity of neighbouring trees. Specifically, the incidence of leaf‐miners decreased with the phylogenetic diversity of neighbouring trees and increased with conspecific adult density in the vicinity of focal trees. Furthermore, leaf mining herbivory was positively correlated with the amount of Si in the leaves of focal saplings, and leaf chewing herbivory decreased with increasing C:N ratio in the leaves. In contrast to our hypothesis, the leaf traits of focal saplings did not serve as a functional link between tree diversity and insect herbivory.Synthesis: Overall, this study highlights the importance of considering the specialisation of insect herbivores in understanding the impacts of the diversity and identity of neighbouring trees on the strength of insect herbivory.