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<p>A sediment core, collected from a shallow lake within the North Slave Region of the Northwest Territories was analyzed for chironomid head capsules and sedimentary chlorophyll<i>-a</i>. The chironomid species assemblage data were applied to a chironomid-based inference model to reconstruct mean July air temperatures since approximately 674 CE. The temperature reconstruction displayed similar late Holocene climate events as other regional climate records, such as lower temperatures during the First Millennial Cooling and the Little Ice Age. However, a key discrepancy was the absence of the twentieth-century warming trend, which may be attributed to site-specific catchment characteristics, such as the lake’s shallow nature, potentially obscuring the regional chironomid-temperature signal. The sedimentary chlorophyll-<i>a</i> indicated enhanced primary production in recent decades, which is in agreement with previous findings on higher algal biomass with recent warming in Arctic and Subarctic lakes. These findings contribute to the characterization of environmental change in Subarctic lakes of northwestern Canada.</p>

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Chironomid-based paleotemperature reconstruction of the North Slave Region (Northwest Territories, Canada) during the Late Holocene

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Colin Robertson,
  • Nicolas Pelletier,
  • John P. Smol,
  • Jesse C. Vermaire

摘要

A sediment core, collected from a shallow lake within the North Slave Region of the Northwest Territories was analyzed for chironomid head capsules and sedimentary chlorophyll-a. The chironomid species assemblage data were applied to a chironomid-based inference model to reconstruct mean July air temperatures since approximately 674 CE. The temperature reconstruction displayed similar late Holocene climate events as other regional climate records, such as lower temperatures during the First Millennial Cooling and the Little Ice Age. However, a key discrepancy was the absence of the twentieth-century warming trend, which may be attributed to site-specific catchment characteristics, such as the lake’s shallow nature, potentially obscuring the regional chironomid-temperature signal. The sedimentary chlorophyll-a indicated enhanced primary production in recent decades, which is in agreement with previous findings on higher algal biomass with recent warming in Arctic and Subarctic lakes. These findings contribute to the characterization of environmental change in Subarctic lakes of northwestern Canada.