德国综合生物多样性研究中心(iDiv) Roel van Klink课题组利用荟萃分析揭示，陆地昆虫数量减少，但淡水昆虫丰度增加。该项研究成果发表在2020年4月24日出版的《科学》杂志上。

最近的案例研究表明昆虫的丰度大幅下降，这引起了人们的警觉，但尚不清楚这种模式的广泛性。

课题组收集了来自1676个站点的166个昆虫组合的长期调查的数据，以研究昆虫的数量随时间变化的趋势。

总体而言，他们发现即使在相邻地点之间，趋势也存在很大差异，但陆生昆虫的丰度平均每十年下降约9％，淡水昆虫的丰度每十年上升约11％。

两种模式在很大程度上是由北美和一些欧洲地区的明显趋势驱动的他们发现了一些与潜在驱动因素（例如，土地利用驱动因素）的关联，并且保护区的趋势往往较弱。

他们的发现提供了比以前建议的昆虫丰度趋势时空模式更为细致的观察。

附：英文原文

Title: Meta-analysis reveals declines in terrestrial but increases in freshwater insect abundances

Author: Roel van Klink, Diana E. Bowler, Konstantin B. Gongalsky, Ann B. Swengel, Alessandro Gentile, Jonathan M. Chase

Issue&Volume: 2020/04/24

Abstract: Recent case studies showing substantial declines of insect abundances have raised alarm, but how widespread such patterns are remains unclear. We compiled data from 166 long-term surveys of insect assemblages across 1676 sites to investigate trends in insect abundances over time. Overall, we found considerable variation in trends even among adjacent sites but an average decline of terrestrial insect abundance by ~9% per decade and an increase of freshwater insect abundance by ~11% per decade. Both patterns were largely driven by strong trends in North America and some European regions. We found some associations with potential drivers (e.g., land-use drivers), and trends in protected areas tended to be weaker. Our findings provide a more nuanced view of spatiotemporal patterns of insect abundance trends than previously suggested.

DOI: 10.1126/science.aax9931

Source: https://science.sciencemag.org/content/368/6489/417