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A Paleolimnological Approach for Interpreting Aquatic Effects Monitoring at the Diavik Diamond Mine (Lac de Gras, Northwest Territories, Canada)
Lake and Reservoir Management ( IF 1.5 ) Pub Date : 2020-07-02 , DOI: 10.1080/10402381.2020.1777232
Jennifer B. Korosi 1 , Joshua R. Thienpont 1 , David C. Eickmeyer 2 , Linda E. Kimpe 2 , Jules M. Blais 2
Affiliation  

Abstract Korosi JB, Thienpont JR, Eickmeyer DC, Kimpe LE, Blais JM. 2020. A paleolimnological approach for interpreting aquatic effects monitoring at the Diavik Diamond Mine (Lac de Gras, Northwest Territories, Canada). Lake Reserv Manage. 36:297–313. A paleolimnological assessment of Lac de Gras (Northwest Territories, Canada) showed pronounced aquatic ecological and biogeochemical changes occurring since at least circa 1950, well before diamond mining operations began in 2000. These changes are likely a response to regional climate warming, which is confounding the interpretation of an Aquatic Effects Monitoring Program (AEMP) intended to identify early-warning indicators of diamond-mining impacts to water quality. In the latest AEMP report, action level exceedances based on 3 years of monitoring in Lac de Gras were reported for chlorophyll a and strontium, yet sediment cores collected from 3 different sites in the lake exhibited notable increasing trends in these parameters since pre-1950. Increases in the small, centric diatom Discostella pseudostelligera have also been occurring since pre-1950, which we infer to be a response to climate warming. Recent (post-1996) D. pseudostelligera increases observed from aquatic effects monitoring of nearby small lakes have previously been linked to nitrogen fertilization from diamond mining. Thus, our paleolimnological results clearly indicate that parameters predicted to respond to mining impacts are also responding similarly to regional climate warming. Based on this, AEMP adaptive management strategies need to consider the potential additive or synergistic effects of mining and climate change when establishing action level exceedances for water quality and ecological indicators. Using our paleolimnological data, we calculated background (premining) rates of change in key geochemical parameters that can provide a benchmark for evaluating ongoing changes in the current mining period, and for establishing AEMP significance thresholds.

中文翻译:

用于解释 Diavik 钻石矿(加拿大西北地区 Lac de Gras)水生影响监测的古湖泊学方法

摘要 Korosi JB、Thienpont JR、Eickmeyer DC、Kimpe LE、Blais JM。2020. 用于解释 Diavik 钻石矿(加拿大西北地区 Lac de Gras)水生效应监测的古湖泊学方法。湖泊保护区管理。36:297-313。对 Lac de Gras(加拿大西北地区)的古湖沼学评估表明,至少在 1950 年左右发生了明显的水生生态和生物地球化学变化,早在 2000 年钻石开采作业开始之前。这些变化可能是对区域气候变暖的反应,这令人困惑对旨在确定钻石开采对水质影响的预警指标的水生影响监测计划 (AEMP) 的解释。在最新的AEMP报告中,根据对 Lac de Gras 的 3 年监测,报告了叶绿素 a 和锶的行动水平超标,但从湖中 3 个不同地点收集的沉积物核心显示出自 1950 年之前这些参数的显着增加趋势。自 1950 年之前,小型中心硅藻 Discostella pseudostelligera 的数量也在增加,我们推断这是对气候变暖的一种反应。最近(1996 年之后)从附近小湖泊的水生效应监测中观察到的 D.pseudostelligera 增加以前与钻石开采中的氮肥有关。因此,我们的古湖泊学结果清楚地表明,预测响应采矿影响的参数也与区域气候变暖类似。基于此,AEMP 适应性管理策略在确定水质和生态指标的行动水平超标时,需要考虑采矿和气候变化的潜在叠加或协同效应。使用我们的古湖泊学数据,我们计算了关键地球化学参数的背景(预开采)变化率,可以为评估当前开采期的持续变化和建立 AEMP 显着性阈值提供基准。
更新日期:2020-07-02
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