极端沿海事件(ECE)的影响,例如海洋洪水或极端风事件,在湖泊生态系统上,从极小到灾难性差异很大。由于对驱动湖泊恢复力的属性的理解有限,准确预测特定系统的响应仍然具有挑战性。为了更好地了解欧洲经委会对浅水咸湖的可能影响,我们采用了古海洋学方法来重建BroadPond对四个ECE的响应,这些ECE可从清晰的沉积标记中识别出来,并可追溯到约。公元1740年、1790年、1862年和1993年。我们旨在评估ECE对BroadPond的总体影响及其对各种水生生物群的具体影响。我们重新研究了先前研究的沉积物芯,覆盖了最后一个ca。通过检查陆地和水生花粉400年,孢子和非花粉孢霉,锁骨,和摇蚊。此外,重新检查了可用的硅藻数据。总的来说,宽池塘对ECE表现出弹性反应,正如我们的代理记录中大多数有限的组成失误所表明的那样。仅在硅藻中观察到物种组成与ECE之间的统计学显着关系。确定的唯一延长的变化是,在可能与ca有关的轻微湖泊茶点之后,先前几乎不存在的chironomids的传播。1740CE事件。此事件之后也是短暂的(约。15年)的Scenedesmus丰度增加了五倍,这可能是由ECE对养分利用率的影响引起的。其余三个ECE的影响仅在硅藻记录中可见,持续显示两种厌钙和贫营养物种的减少,贝氏阿克纳多啶和长叶柏列萨,对于CA也很明显。1740CE事件。宽池塘中ECE引起的相对较小的生态系统变化缺乏单一的解释,需要考虑多个特定地点和事件的因素。
The impacts of extreme coastal events (
ECEs), such as marine inundations or extreme wind events, on lake ecosystems vary widely from minimal to catastrophic. Accurately predicting the response of a specific system remains challenging due to a limited understanding of the attributes that drive the resilience of lakes. In an attempt to better understand the possible impacts of
ECEs on shallow brackish lakes, we employed a paleolimnological approach to reconstruct the responses of Broad Pond to four
ECEs identifiable from clear sedimentary markers and dated to ca. 1740, 1790, 1862, and 1993 CE. We aimed to evaluate the overall impacts of
ECEs on Broad Pond and their specific effects on various hydrobiont groups. We reinvestigated a previously studied sediment core covering the last ca. 400 years by examining terrestrial and aquatic pollen, spores and non-pollen palynomorphs, cladocerans, and chironomids. Additionally, available diatom data were reexamined. Overall, Broad Pond exhibited resilient responses to
ECEs, as indicated by mostly limited compositional turnovers in our proxy records. Statistically significant relationships between species composition and ECEs were observed only for diatoms. The only prolonged change identified is the spread of previously near-absent chironomids in the aftermath of a slight lake refreshment likely associated with the ca. 1740 CE event. This event was also followed by a short-lived (ca. 15 years) five-fold increase in the abundance of Scenedesmus that could have been triggered by the effects of the ECE on nutrient availability. The impact of the remaining three ECEs was discernible only in the diatom record, consistently showing a decline in two calcifobic and oligotrophic species, Achnanthidium petersenii and Platessa oblongella, also evident for the ca. 1740 CE event. The relatively minor ecosystem alteration induced by ECEs in Broad Pond lacks a single explanation and requires consideration of multiple site- and event-specific factors.