Contrasting patterns of ground spider and beetle activity across a Japanese knotweed-dominated riparian gradient

Katie S. Fischer, Lindsey Arnold, R. Daley, Tara Barbarich, H. Shannon, M. Persons, D. Matlaga
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Abstract

Arthropod distributions across riparian gradients remain incompletely understood. Within riparian buffers, invasive plants such as Fallopia japonica (Japanese knotweed) may influence abiotic conditions and potentially arthropod distributions. We quantified ground spider and ground beetle activity across a Japanese knotweed-dominated riparian buffer using five months of pitfall trapping data. Results from pitfall samples suggest that spider and beetle activity is negatively correlated with the presence of Japanese knotweed along the riparian gradient. We found that beetle activity declined with increasing distance from the river, while spider activity showed the opposite trend. Spiders and beetles also differed in the timing of their activity. Overall nocturnal beetle activity was much higher than diurnal beetle or spider activity. Ground spider and beetle activity levels were lower across the knotweed-dominated riparian area, which may be attributed to reduced litter and herbaceous vegetation, reduced light penetration, drier soil, lower plant diversity, or reduced prey availability in this area.
在以日本结草为主的河岸梯度上,地面蜘蛛和甲虫活动的对比模式
节肢动物在河岸梯度上的分布仍不完全清楚。在河岸缓冲带内,入侵植物如日本黄叶(日本结叶)可能影响非生物条件和潜在的节肢动物分布。我们利用5个月的陷阱捕获数据,量化了日本结叶草为主的河岸缓冲地带地面蜘蛛和地面甲虫的活动。陷阱样本的结果表明,沿河岸梯度,蜘蛛和甲虫的活动与日本结缕草的存在呈负相关。甲虫的活动随着离河距离的增加而减少,而蜘蛛的活动则相反。蜘蛛和甲虫在活动时间上也有所不同。甲虫夜间活动的总体水平远高于甲虫或蜘蛛的日间活动。在以结缕草为主的河岸区,蜘蛛和甲虫的活动水平较低,这可能是由于该地区凋落物和草本植被减少、光照减少、土壤干燥、植物多样性降低或猎物可利用性降低所致。
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