Moderate warming over the past 25 years has already reorganized stream invertebrate communities
Moderate warming over the past 25 years has already reorganized stream invertebrate communities
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DOI：
10.1016/j.scitotenv.2018.12.234
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发表时间：
2019-03-25
影响因子：
9.8
通讯作者：
Stoll, Stefan
中科院分区：
文献类型：
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作者：
Haase, Peter;Pilotto, Francesca;Stoll, Stefan
气候变暖往往导致物种分布范围的转移、生物多样性的丧失和生物区系累积的气候债务（即生物区系的变化慢于温度的变化）。在这里，我们分析了25年（1990-2014）来溪流无脊椎动物群落组成和温度特征的变化，基于中欧大海拔，纬度和经度梯度的大量样本（n = 3782）。虽然变暖是温和的（平均0.5摄氏度），我们发现了一个强大的重组流无脊椎动物群落。总丰度（+35.9%）和丰富度（+39.2%）显著增加。暖栖类群的丰度（TA）和分类丰富度（TR）的份额（TA：+73.2%; TR：+60.2%）和中温类群的丰度（TA：+0.4%; TR：+53%）也有所增加，而冷栖类群的丰度（TA：-61.5%; TR：-47.3%）有所下降。社区温度指数，代表温度签名的strearn无脊椎动物社区，增加了物理温度以类似的速度，表明嗜热的社区，并首次没有气候债务。最强烈的变化发生在沿着海拔梯度，表明流无脊椎动物使用的空间配置的河流网络，以跟踪其温度生态位上坡。然而，由于峰会陷阱效应，这种情况可能很快就会结束。我们的研究结果表明，在仅0.5摄氏度的变暖条件下，嗜热物种正在不断取代冷适应物种，鉴于未来几十年预计将出现更剧烈的气候变暖，这一点尤其令人担忧。(C)2018爱思唯尔B. V.保留所有权利。
Climate warming often results in species range shifts, biodiversity loss and accumulated climatic debts of biota (i.e. slower changes in biota than in temperature). Here, we analyzed the changes in community composition and temperature signature of stream invertebrate communities over 25 years (1990-2014), based on a large set of samples (n = 3782) over large elevation, latitudinal and longitudinal gradients in central Europe. Although warming was moderate (average 0.5 degrees C), we found a strong reorganization of stream invertebrate communities. Total abundance (+35.9%) and richness (+39.2%) significantly increased. The share of abundance (TA) and taxonomic richness (TR) of warm-dwelling taxa (TA: +73.2%; TR: +60.2%) and medium-temperature-dwelling taxa (TA: +0.4%; TR: +53%) increased too, while cold-dwelling taxa declined (TA: -61.5%,; TR: -47.3%). The community temperature index, representing the temperature signature of strearn invertebrate communities, increased at a similar pace to physical temperature, indicating a thermophilization of the communities and, for the first time, no climatic debt. The strongest changes occurred along the altitudinal gradient, suggesting that stream invertebrates use the spatial configuration of river networks to track their temperature niche uphill. Yet, this may soon come to an end due to the summit trap effect. Our results indicate an ongoing process of replacement of cold-adapted species by thermophilic species at only 0.5 degrees C warming, which is particularly alarming in the light of the more drastic climate warming projected for coming decades. (C) 2018 Elsevier B.V. All rights reserved.