Ecology and Evolution Lab, Universidade Do Vale Do Taquari, Univates, Avelino Talini Street, number 171, Universitário, Lajeado, RS, 95900-000, Brazil.
Rydberg Laboratory for Applied Sciences, RLAS, Halmstad University, P.O. Box 823, 30118, Halmstad, Sweden.
Sci Rep. 2020 Sep 21;10(1):15411. doi: 10.1038/s41598-020-71685-5.
All natural populations show fluctuations in space or time. This is fundamental for the maintenance of biodiversity, as it allows species to coexist. Long-term ecological studies are rare, mainly due to logistics, but studies like the one presented below recognize the dimensionality of temporal change and the ecological processes that lead to shifts in community composition over time. Here, we used three sampling occasions from a dataset spanning 20 years where dragonflies in central Sweden were monitored. Our aim was to investigate how the prevalence of ecological and biological species traits varied over time measured as Community-level Weighted Means of trait values (CWM). Most CWM values varied significantly between years. Most of the traits changed between the second and the last sampling occasion, but not between the two first ones. These changes could be linked to major changes in species abundance. Our work indicates that fundamental shifts in community structure can occur over a short time, providing environmental drivers act on species turnover. In our case, Climate change and pH levels in lakes are most likely the most important factors.
所有自然种群在空间或时间上都表现出波动。这对于维持生物多样性是至关重要的，因为它允许物种共存。长期的生态研究很少见，主要是由于后勤问题，但像下面提出的研究认识到时间变化的多维性以及导致群落组成随时间变化的生态过程。在这里，我们使用了来自瑞典中部蜻蜓监测数据集的三个采样时间点，该数据集跨越了 20 年。我们的目的是调查生态和生物物种特征的流行程度如何随时间变化，这是通过测量作为群落水平加权平均值的特征值 (CWM) 来衡量的。大多数 CWM 值在年份之间差异显著。大多数特征在第二和最后一次采样之间发生了变化，但在头两次采样之间没有变化。这些变化可能与物种丰度的重大变化有关。我们的工作表明，群落结构的根本变化可能在短时间内发生，前提是环境驱动因素作用于物种更替。在我们的案例中，气候变化和湖泊的 pH 值很可能是最重要的因素。
