Metrics of structural change as indicators of chironomid community stability in high latitude lakes
Metrics of structural change as indicators of chironomid community stability in high latitude lakes
复制标题
DOI：
10.1016/j.quascirev.2020.106594
复制
发表时间：
2020-12
影响因子：
4
通讯作者：
Roseanna J. Mayfield;P. Langdon;C. Patrick Doncaster;J. Dearing;Rong Wang;L. Nazarova;A. Medeiros
中科院分区：
文献类型：
--
作者：
Roseanna J. Mayfield;P. Langdon;C. Patrick Doncaster;J. Dearing;Rong Wang;L. Nazarova;A. Medeiros
了解气候变化对生态系统结构和稳定性的影响具有挑战性，特别是在预计环境温度将经历最大幅度上升的高纬度地区。全球变暖可能是淡水湖生态系统变化的主要驱动力。温度升高可以积极或消极地影响湖泊群落组成，通过冷适应类群的损失和温带或广布类群的到来。在这里，我们分析了温度引起的变化可能产生的影响，环境敏感的摇蚊（双翅目：摇蚊科）在三个地区-北方北美，挪威和俄罗斯-使用现有的数据集的分类丰富度和成分营业额。结构参数（β多样性，成分紊乱，网络偏度）被应用到模型模拟和经验摇蚊数据集在一个大的空间温度梯度。经验数据集的分析表明，在不同的温度梯度群落结构的变化，表明不同的生态系统的稳定性或不稳定性的状态。与零模型的比较，使评估这些压力是否同意预期的模式，由于共同变化的夏季温度条件下，或他们是否偏离预期，表明对生态系统的额外压力。对于所有这三个地区，在中等温度范围内的湖泊表现出相对的生态系统稳定性的最大证据，更大的β多样性，成分紊乱，偏态，未预料到的建模模拟。这很可能是由于生态交错带边界的生境更加多样化，以及其他可能影响生态系统结构的因素。因此，我们表明，典型的生态系统稳定性的结构变化，可以通过在整个温度梯度的社区结构的变化进行检测。这对于了解湖泊在当前和未来气候变化下可能如何变化非常重要。
Understanding the effects of climate change on ecosystem structure and stability is challenging, especially in high latitude regions that are predicted to experience the largest increases in ambient temperature. Global warming is likely to be a key driver of ecosystem change in freshwater lakes. Increased temperature can positively or negatively affect lake community composition through the loss of cold-adapted taxa and the arrival of temperate or eurytopic taxa. Here, we analyse the likely effects of temperature-induced changes in taxonomic richness and compositional turnover of environmentally-sensitive chironomids (Diptera: Chironomidae) across three regions - northern North America, Norway, and Russia - using existing datasets. Structural parameters (beta diversity, compositional disorder, and network skewness) were applied to model-simulated and empirical chironomid datasets across a large spatial temperature gradient. The analyses of empirical datasets showed changes in community structure across temperature gradients, suggesting varying states of ecosystem stability or instability. The comparison with null models enabled assessment as to whether these stresses agreed with expected patterns due to covarying summer temperature conditions or whether they deviated from expectations suggesting additional stress on the ecosystems. For all three regions, lakes in the mid-temperature range showed most evidence of relative ecosystem stability, with greater beta diversity, compositional disorder, and skewness, unanticipated by the modelled simulations. This is most likely due to more diverse habitats across the ecotone boundaries and additional factors that can influence ecosystem structures. Thus, we show that structural changes typical for ecosystem stability can be detected through changes in community structure across temperature gradients. This is important for understanding how lakes may change under current and future climate change.