Invasive species threaten biodiversity, ecosystem function, and human health, but the long-term drivers of invasion dynamics remain poorly understood. We use data from a 28-yr ongoing survey of a Northern California ant community invaded by the Argentine ant (Linepithema humile) to investigate the influence of abiotic and biotic factors on invasion dynamics. We found that the distribution of L. humile retracted following an extreme drought that occurred in the region from 2012 to 2015. The distribution of several native ant species also contracted, but overall native ant diversity was higher after the drought and for some native ant species, distributions expanded over the 28-yr survey period. Using structural equation models, we found the strongest impact on the distribution of L. humile was from direct effects of climate, namely, cumulative precipitation and summer maximum temperatures, with only a negligible role for biotic resistance and indirect effects of climate mediated by native ants. The increasing drought and high temperature extremes projected for northern California because of anthropogenic-driven climate change may limit the spread, and possibly the impact, of L. humile in invaded regions. The outcome will depend on the response of native ant communities to these climatic stressors.

中文翻译：

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多年干旱加剧了气候对入侵蚂蚁物种的长期影响

入侵物种威胁生物多样性、生态系统功能和人类健康，但入侵动态的长期驱动因素仍然知之甚少。我们使用来自对阿根廷蚂蚁 ( Linepithema humile ) 入侵的北加州蚂蚁群落进行的 28 年持续调查的数据来调查非生物和生物因素对入侵动态的影响。我们发现L的分布。 谦卑在 2012 年至 2015 年该地区发生极端干旱后，该地区发生了严重干旱。几种本地蚂蚁物种的分布也有所收缩，但干旱后总体本地蚂蚁多样性更高，对于一些本地蚂蚁物种，分布在 28 年的调查中扩大时期。使用结构方程模型，我们发现对L分布的影响最大。 谦卑来自气候的直接影响，即累积降水和夏季最高温度，对生物抗性和本地蚂蚁介导的气候间接影响的作用可以忽略不计。由于人为驱动的气候变化，预计加利福尼亚北部的干旱和高温极端事件会增加，这可能会限制气候变化的传播，并可能限制其影响。大号_ 在被侵略的地区谦卑。结果将取决于本地蚂蚁群落对这些气候压力源的反应。