Time series data on arthropod populations are critical for understanding the magnitude, direction, and drivers of change. However, most arthropod monitoring programs are short-lived and restricted in taxonomic resolution. Monitoring data from the Arctic are especially underrepresented, yet critical to uncovering and understanding some of the earliest biological responses to rapid environmental change. Clear imprints of climate on the behavior and life history of some Arctic arthropods have been demonstrated, but a synthesis of population-level abundance changes across taxa is lacking. We utilized 24 y of abundance data from Zackenberg in High-Arctic Greenland to assess trends in abundance and diversity and identify potential climatic drivers of abundance changes. Unlike findings from temperate systems, we found a nonlinear pattern, with total arthropod abundance gradually declining during 1996 to 2014, followed by a sharp increase. Family-level diversity showed the opposite pattern, suggesting increasing dominance of a small number of taxa. Total abundance masked more complicated trajectories of family-level abundance, which also frequently varied among habitats. Contrary to expectation in this extreme polar environment, winter and fall conditions and positive density-dependent feedbacks were more common determinants of arthropod dynamics than summer temperature. Together, these data highlight the complexity of characterizing climate change responses even in relatively simple Arctic food webs. Our results underscore the need for data reporting beyond overall trends in biomass or abundance and for including basic research on life history and ecology to achieve a more nuanced understanding of the sensitivity of Arctic and other arthropods to global changes.

节肢动物种群的时间序列数据对于了解变化的幅度，方向和驱动因素至关重要。然而，大多数节肢动物监测程序是短暂的，并且在生物分类学分辨率上受到限制。北极地区的监测数据代表性不足，但对于发现和了解对快速环境变化的某些最早的生物学反应至关重要。已经证明气候对某些北极节肢动物的行为和生活史有清晰的印记，但缺乏对整个分类单元中种群水平的丰度变化的综合记录。我们利用了来自北极高地格陵兰Zackenberg的24年丰度数据来评估丰度和多样性的趋势，并确定丰度变化的潜在气候动因。与温带系统的发现不同，我们发现了一种非线性模式，在1996年至2014年期间，节肢动物的总丰度逐渐下降，随后急剧上升。家庭级别的多样性显示出相反的模式，表明少数类群的优势日益增强。总的丰度掩盖了家庭层面的丰度的更复杂的轨迹，而这些轨迹在生境之间也经常变化。与这种极端极地环境中的预期相反，冬季和秋季条件以及依赖于密度的正反馈比节肢温度更普遍地决定了节肢动物的动态。这些数据一起突出显示了即使在相对简单的北极食物网中，表征气候变化对策的复杂性。