Abstract
Previous paleolimnological investigations have examined the effects of gold mining operations, local land-use changes, and regional climate warming on the aquatic biota from shallow lakes in Yellowknife, Northwest Territories, Canada. However, the long-term impacts of these multiple environmental stressors on the biota of deeper lakes that support large-bodied fish species have not been investigated. In this study, we examined multiple sedimentary proxies from two deep lakes around Yellowknife to assess the long-term effects of metalloid contamination, development of the city, and recent warming over the past ~ 200 years. The sedimentary metalloid profiles tracked the influence of mining operations and local land-use changes in the Yellowknife area and there were some similarities in the diatom responses to multiple stressors across the two lakes. However, the increases in sedimentary metalloid concentrations, eutrophic diatom taxa, and whole-lake primary production were more pronounced at Grace Lake relative to Alexie, likely because Grace is located nearer to the gold mines, as well as local city development. The overall lake primary production and the relative abundance of the planktonic diatom Discostella stelligera increased at both sites suggesting that some of the biological changes may be influenced by changes in thermal stratification, as has been documented in a wide spectrum of lakes across the Northern Hemisphere. Furthermore, the diatom assemblage changes in these deep lakes differed from those observed from shallow lakes in the region, suggesting that site-specific limnological characteristics will influence the biological responses to multiple environmental stressors through time.







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Acknowledgements
Water chemistry analysis by Judy Mah and the Taiga Environmental Laboratory, and field work by Kristen Coleman, Dave Eickmeyer, Jennifer Korosi, and Joshua Thienpont are greatly acknowledged. The authors thank Profs. Piepenburg and Van de Vijver along with two anonymous reviewers for providing constructive feedback on our manuscript that improved the clarity and quality. This study was funded by a Natural Sciences and Engineering Research Council of Canada (NSERC) Strategic Grant (STPGP 493786-16) and Polar Continental Shelf Program grants to Jules M. Blais and John P. Smol, as well as an NSERC Alexander Graham Bell Canada Graduate Scholarship D, Northern Scientific Training Program, and a W. Garfield Weston Scholarship for Northern Research (doctoral) to Branaavan Sivarajah.
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Sivarajah, B., Cheney, C.L., Perrett, M. et al. Regional gold mining activities and recent climate warming alter diatom assemblages in deep sub-Arctic lakes. Polar Biol 43, 305–317 (2020). https://doi.org/10.1007/s00300-020-02635-0
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DOI: https://doi.org/10.1007/s00300-020-02635-0