Algal responses to metal(loid) pollution, urbanization, and climatic changes in sub-Arctic lakes around Yellowknife, Canada

IF 2.7 3区 地球科学 Q2 ECOLOGY
B. Sivarajah, J. Korosi, Joshua R. Thienpont, L. Kimpe, J. Blais, J. Smol
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引用次数: 0

Abstract

The lakes around Yellowknife (Northwest Territories, Canada) have been impacted by multiple environmental stressors throughout the 20th and early 21st centuries. Here, we have synthesized diatom assemblage data from ten lake sediment cores from the Yellowknife area and used a landscape-scale paleolimnological approach to investigate the cumulative impacts of past gold mining activities, urbanization, and climate warming on aquatic biota. Our investigations indicated that diatom species turnover (measured using detrended canonical correspondence analysis) was highest at lakes closer to the city and mines, as these sites were more severely impacted by land-use changes (e.g. sewage disposal, run-off from waste disposal sites) and roaster stack emission from the gold mines. Diatom assemblage shifts indicative of climate-induced changes to lake thermal properties were also observed across the gradient of human activities. The inclusion of remote sites was useful to disentangle the effects of climate-mediated changes from impacts related to mining and urbanization. This investigation suggests that the diatom assemblages of the lakes around Yellowknife have changed markedly over the last ~80 years and there are no signs of biological recovery since the cessation of mining activities around the turn of the 21st century. The biota of the sub-Arctic lakes around Yellowknife are now strongly influenced by climate-mediated changes to lake thermal properties and the urban lakes are also influenced by the legacies of past land-use changes.
加拿大耶洛奈夫附近亚北极湖泊中藻类对金属污染、城市化和气候变化的响应
在整个20世纪和21世纪初,Yellowknife(加拿大西北地区)周围的湖泊受到了多种环境压力的影响。在这里,我们合成了来自Yellowknife地区的十个湖泊沉积物岩芯的硅藻组合数据,并使用景观尺度的古湖沼学方法来研究过去的金矿开采活动、城市化和气候变暖对水生生物群的累积影响。我们的调查表明,在离城市和矿山较近的湖泊中,硅藻物种的周转率(使用去趋势正则对应分析测量)最高,因为这些地点受到土地利用变化(如污水处理、废物处理场的径流)和金矿焙烧堆排放的影响更为严重。在人类活动的梯度上,还观察到硅藻组合的变化,表明气候引起的湖泊热性质的变化。纳入偏远地区有助于将气候变化的影响与采矿和城市化的影响区分开来。这项调查表明,在过去的80年里,Yellowknife周围湖泊的硅藻组合发生了显著变化,自21世纪初采矿活动停止以来,没有任何生物恢复的迹象。Yellowknife周围亚北极湖泊的生物群现在受到气候介导的湖泊热特性变化的强烈影响,城市湖泊也受到过去土地利用变化的影响。
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来源期刊
Arctic Science
Arctic Science Agricultural and Biological Sciences-General Agricultural and Biological Sciences
CiteScore
5.00
自引率
12.10%
发文量
81
期刊介绍: Arctic Science is an interdisciplinary journal that publishes original peer-reviewed research from all areas of natural science and applied science & engineering related to northern Polar Regions. The focus on basic and applied science includes the traditional knowledge and observations of the indigenous peoples of the region as well as cutting-edge developments in biological, chemical, physical and engineering science in all northern environments. Reports on interdisciplinary research are encouraged. Special issues and sections dealing with important issues in northern polar science are also considered.
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