Invasive Glossy Buckthorn (Frangula alnus) Has Weak Impact on Native Understory Plant and Saprophagous Macroarthropod Communities

Diversity Pub Date : 2024-09-14 DOI:10.3390/d16090584
Gabrielle Roberge, Ira Tanya Handa, Tristan Juette, Daniel Kneeshaw
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Abstract

Glossy buckthorn (Frangula alnus Miller) is an invasive alien plant species (IAPS) rapidly expanding in North America but is largely understudied compared to the common buckthorn (Rhamnus cathartica). Our study investigated the effects of a 27-year-old F. alnus invasion on native understory plant and saprophagous macroarthropod communities in a wet deciduous woodland in Southern Québec, Canada. We hypothesized a decreased taxonomic diversity and a change in community composition of both indicator taxa with increasing F. alnus density. The understory plant and saprophagous macroarthropod communities were characterized, respectively, through vegetation surveys and pitfall trapping across a density gradient of 43 plots invaded by F. alnus. Our results demonstrated that F. alnus did not exert a strong influence on species community composition, although the homogenization of understory plant communities was observed. Despite several decades of F. alnus invasion at our study site, the consequences on the selected indicator taxa were overall relatively small, suggesting that the magnitude of effects is variable. We suggest that further investigation at a larger scale should be performed to evaluate the effect of F. alnus on a broad diversity of indicators and understand any context dependency.
外来入侵的光棘(Frangula alnus)对本地底层植物和食螨类大型节肢动物群落的影响较弱
有光泽的沙棘(Frangula alnus Miller)是一种在北美迅速扩展的外来入侵植物物种(IAPS),但与普通沙棘(Rhamnus cathartica)相比,该物种在很大程度上未得到充分研究。我们的研究调查了有 27 年历史的欧鼠李入侵对加拿大魁北克省南部潮湿落叶林地中本地下层植物和食螨类大型节肢动物群落的影响。我们假设,随着桤木蕨类植物密度的增加,这两种指示性类群的分类多样性会降低,群落组成也会发生变化。我们通过植被调查和陷阱诱捕法,在43个被欧鼠李入侵的密度梯度地块上分别描述了林下植物群落和食腐大型节肢动物群落的特征。我们的研究结果表明,欧鼠李对物种群落组成的影响并不大,但观察到了林下植物群落的同质化。尽管欧鼠李入侵我们的研究地点已有几十年,但对所选指示性分类群的影响总体上相对较小,这表明影响的程度是可变的。我们建议在更大范围内开展进一步调查,以评估欧鼠李对多种指标的影响,并了解任何环境依赖性。
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