Effects of insect herbivory on seedling mortality in restored and remnant tropical forest

Effects of insect herbivory on seedling mortality in restored and remnant tropical forest
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昆虫食草对恢复和残余热带森林幼苗死亡率的影响

DOI:
10.1111/rec.13467
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发表时间:
2021
影响因子:
3.2
通讯作者:
Holl, Karen D.
Holl, Karen D.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Kulikowski, II, Andy J.;Zahawi, Rakan A.;Holl, Karen D.

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昆虫植食是热带地区幼苗死亡的主要驱动因素之一,并影响植物丰度和群落组成。人为干扰可以改变昆虫植食模式,对恢复森林中的植物群落产生潜在影响。我们在13-15年的恢复和残留的热带森林中种植了早期和后期演替树种的幼苗。然后,我们要么排除昆虫食草动物,要么让幼苗暴露在空气中,以研究昆虫食草动物如何影响幼苗死亡率。当食草昆虫被排除在恢复和残留的森林站点之外时,早期演替幼苗的死亡率也出现了类似的下降,但这种影响较小,并且仅由恢复森林中的少数物种驱动。随后,在开放和除虫处理之间,继承幼苗的死亡率下降幅度比恢复地点更大。我们的研究结果表明,在恢复的森林中,食草动物驱动的幼苗死亡率较低,特别是对于后期演替的幼苗。从恢复的角度来看,结果是令人鼓舞的,因为后期演替幼苗的补充是生态系统恢复的关键组成部分。然而,如果减少幼苗死亡率继续在长期内,这可能会影响树木群落组成的演替进程。
Insect herbivory is one of the major drivers of seedling mortality in the tropics and influences plant abundances and community composition. Anthropogenic disturbance can alter patterns of insect herbivory with potential consequences on plant communities in restored forests. We planted seedlings of early‐ and later‐stage successional tree species in 13–15‐year‐old restored and remnant tropical forests. We then either excluded insect herbivores or left seedlings exposed to examine how insect herbivory‐affected seedling mortality. Early‐successional seedlings experienced similar decreases in mortality when insect herbivores were excluded from both restored and remnant forest sites, but this effect was smaller and driven by only a few species in restored forests. Later‐successional seedlings experienced a stronger decrease in mortality between open and insect‐excluded treatments in remnant than restored sites. Our results suggest that herbivory‐driven seedling mortality is lower in restored forests, particularly for later‐successional seedlings. Results are encouraging from a restoration perspective because recruitment of later‐successional seedlings is a key component of ecosystem recovery. However, if reductions in seedling mortality continue over the long term, this may affect tree community composition as succession progresses.
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