期刊
HYDROBIOLOGIA
卷 849, 期 12, 页码 2705-2729出版社
SPRINGER
DOI: 10.1007/s10750-022-04887-9
关键词
Paleolimnology; Wilderness lakes; Carbon burial; Biogenic silica; Diatoms; Cyclotelloids
资金
- Great Lakes Network Inventory and Monitoring of the US National Park Service [P20AC00364-01]
- Air Resources Division of the US National Park Service [H6000082000]
- US Geological Survey [PM1594151]
- Environment and Natural Resources Trust Fund through the Minnesota Department of Natural Resources [B33299]
- Grand Portage Band of Lake Superior Chippewa through the US Geological Survey [8607-AZJ00]
Evidence suggests that boreal-lake ecosystems are undergoing rapid changes due to climate warming, with variable ecological responses. Paleolimnological analysis revealed significant shifts in diatom communities and increased carbon and biogenic silica burial. The historical response of algal communities indicates that physical characteristics of lakes and watersheds can predict sensitivity to climate change.
Evidence suggests that boreal-lake ecosystems are changing rapidly, but with variable ecological responses, due to climate warming. Paleolimnological analysis of 27 undeveloped northern forested lakes showed significant and potentially climate-mediated shifts in diatom communities and increased carbon and biogenic silica burial. We hypothesize the sensitivity of northern forested lakes to climate change will vary along two physical gradients: one reflecting direct, in-lake climate effects (propensity to thermally stratify), the other reflecting indirect watershed effects (watershed to lake-surface area ratio). We focus on the historical response of algal communities to test our two-dimensional sensitivity framework. Historical algal response was summarized by measures of diatom community turnover, changes in species and diagnostic species groups, and measures of siliceous algal and overall primary production (biogenic silica, carbon burial). Measures of algal production increased across all lake types, with carbon burial proportionately higher in polymictic lakes. Greater diatom community change occurred in deep, stratified lakes with smaller watersheds, whereas diatom species groups showed variable responses along our two-dimensional sensitivity framework. Physical characteristics of lakes and watersheds could serve as predictors of sensitivity to climate change based on paleo-indicators that are mechanistically linked to direct and indirect limnological effects of climate change.
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