‘Mother knows best’: Maternal oviposition effects of a range‐expanding insect herbivore degrade coastal wetlands by targeting juvenile foundation plant species
‘Mother knows best’: Maternal oviposition effects of a range‐expanding insect herbivore degrade coastal wetlands by targeting juvenile foundation plant species
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DOI：
10.1002/ldr.4369
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发表时间：
2022-05
影响因子：
4.7
通讯作者：
Z. Ning;Cong Chen;B. Cui;Yihui Zhang;T. Xie;Qing Wang;Zhenchang Zhu;J. Bai;T. Bouma
中科院分区：
文献类型：
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作者：
Z. Ning;Cong Chen;B. Cui;Yihui Zhang;T. Xie;Qing Wang;Zhenchang Zhu;J. Bai;T. Bouma
气候变化和人类活动导致的物种范围扩大威胁着整个生物圈的土著人口和社区。昆虫食草动物是植物的重要消费者，众所周知，在全球变化的情况下，它们的活动范围会扩大或缩小，这可能会对新到达的环境造成影响。草食性昆虫对产卵地点的选择会显著影响后代的表现。然而，这种影响在影响接受方生态系统方面的作用很少被探讨。在这里，我们提供了第一个证据表明，一种陆地范围扩大的植食性二化螟(Zeuzera Leuconotom Butler)在盐沼中对基础植物罗望子(Tamarisk Chinensis)的树苗进行了严重攻击。长期的野外调查和室内行为实验表明，成虫的产卵偏好有利于其幼虫的繁殖。雌蜂倾向于在新寄主植物的幼枝上产卵，新寄主植物的幼枝通常较软，含有足够的幼虫发育所需的营养物质，这表明雌性仍然可以在新寄主植物上做出正确的选择。这一发现支持了“母亲最了解”的假说，即雌性昆虫会进化到在它们的后代最好的寄主上产卵。因此，在这种自上而下的控制下，寄主植物幼苗的存活率急剧下降，表明这种范围扩大的昆虫的食草性对沿海基础物种的招募和演替产生了深远的负面影响，从而可能导致盐沼退化。这些发现突显了母体产卵效应在范围扩大的昆虫中的重要性，以及这些种群如何利用新的寄主植物建立并威胁沿海湿地。
Species range expansion induced by climate change and human activities threaten native populations and communities across the biosphere. Insect herbivores, important consumers of plants, are known to expand or contract their range under global change, with potential consequences to the newly reached environment. The selection of oviposition sites by herbivorous insects could notably impact offspring performance. However, the role of such effects in impacting the receiving ecosystem has been rarely explored. Here, we provide the first evidence showing that a terrestrial range‐expanding phytophagous wood‐borer moth (Zeuzera leuconotum Butler) heavily attacked the saplings of a foundation plant species tamarisk (Tamarix chinensis) in salt marshes. Long‐term field surveys and laboratory behaviour experiments revealed that the oviposition preference of adult females was beneficial to their larval performance. The preference to oviposit on young branches of the new host plants, which were often softer and contained enough nutrients for larval development, indicates that females could still make the right choice on novel host‐plants. This finding supports the ‘mother knows best’ hypothesis that female insects will evolve to oviposit on hosts on which their offspring fare best. Consequently, the survival of host‐plant saplings decreased dramatically under this top‐down control, revealing that herbivory of this range‐expanding insect has a profound negative impact on the recruitment and succession of coastal foundation species, thereby potentially leading to saltmarsh degradation. These findings highlight the importance of the maternal oviposition effects in range‐expanding insects and how these populations can establish using novel host‐plants and threaten coastal wetlands.