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Mesquita, Patricia S; Wrona, Frederick J; Prowse, Terry D (2010): Physical, chemical and biological characteristics of disturbed and undisturbed Arctic lakes, Northwest Territories [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.816875, Supplement to: Mesquita, PS et al. (2010): Effects of retrogressive permafrost thaw slumping on sediment chemistry and submerged macrophytes in Arctic tundra lakes. Freshwater Biology, 55(11), 2347-2358, https://doi.org/10.1111/j.1365-2427.2010.02450.x

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Abstract:
1. Global warming is predicted to cause changes in permafrost cover and stability in the Arctic. Zones of high ion concentration in regions of ice-rich permafrost are a reservoir of chemicals that can potentially be transferred to fresh waters during thawing. Consequently, input of enriched runoff from the thaw and sediment and vegetation from the landscape could alter lakes by affecting their geochemistry and biological production.
2. Three undisturbed lakes and five lakes disturbed by retrogressive permafrost thaw slumps were sampled during late summer of 2006 to assess the potential effects of thermokarst shoreline slumping on water and sediment chemistry, the underwater light regime, and benthic macrophyte biomass and community structure.
3. Undisturbed lakes had sediments rich in organic material and selected micronutrients, while disturbed lakes had sediments richer in calcium, magnesium and strontium, greater transparency of the water column, and a well-developed submerged macrophyte community.
4. It is postulated that enriched runoff chemistry may alter nutrient availability at the sediment-water interface and also the degradation of organic material, thus affecting lake transparency and submerged macrophytes. The results suggest that retrogressive permafrost slumping can significantly affect food webs in arctic tundra lakes through an increase in macrophyte biomass and development of a more complex benthic habitat.
Further details:
Exact locations of lakes - jpeg file (2010). Mesquita et al. (2010), hdl:10013/epic.41826.d001
Exact locations of lakes - kmz file (2010). Mesquita et al. (2010), hdl:10013/epic.41826.d002
Project(s):
International Polar Year (2007-2008) (IPY)
Coverage:
Latitude: 69.190000 * Longitude: -134.150000
Date/Time Start: 2006-08-26T00:00:00 * Date/Time End: 2006-08-26T00:00:00
Event(s):
Mackenzie_area * Latitude: 69.190000 * Longitude: -134.150000 * Date/Time Start: 2006-08-26T00:00:00 * Date/Time End: 2006-09-05T00:00:00 * Location: Northwest Territories, Canada * Method/Device: Multiple investigations (MULT)
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Mesquita, PS; Wrona, FJ; Prowse, TD (2010): (Table 1) Characteristics of disturbed and undisturbed Arctic lakes in the area between Inuvik and Richards Island. https://doi.org/10.1594/PANGAEA.816871
  2. Mesquita, PS; Wrona, FJ; Prowse, TD (2013): (Table S2) Water chemistry of disturbed and undisturbed Arctic lakes in the area between Inuvik and Richards Island. https://doi.org/10.1594/PANGAEA.816872
  3. Mesquita, PS; Wrona, FJ; Prowse, TD (2010): (Table S3) Light attenuation at the littoral zone of disturbed and undisturbed Arctic lakes in the area between Inuvik and Richards Island. https://doi.org/10.1594/PANGAEA.816873
  4. Mesquita, PS; Wrona, FJ; Prowse, TD (2010): (Table S7) Macrophyte biomass of disturbed and undisturbed Arctic lakes in the area between Inuvik and Richards Island. https://doi.org/10.1594/PANGAEA.816874