2021
DOI: 10.1139/as-2020-0038
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Under-ice limnology of coastal valley lakes at the edge of the Arctic Ocean

Abstract: The northern coast of Ellesmere Island in the Canadian High Arctic is undergoing amplified warming that parallels the rapid decline in Arctic Ocean sea ice extent, and many lakes in this region have already shown changes in response to warming. However, biogeochemical data from High Arctic freshwaters are limited, and mostly restricted to the short, ice-free period. We sampled four coastal lakes in Stuckberry Valley (82° 54’ N, 66° 56’ W) before the onset of spring melting in 2017, 2018 and 2019, to assess bio… Show more

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Cited by 5 publications
(9 citation statements)
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References 94 publications
(105 reference statements)
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“…These ammonia-oxidizing archaea prefer aquatic habitats with low dissolved oxygen, pH, nutrients, and light (Erguder et al, 2009;Hatzenpichler, 2012;Auguet and Casamayor, 2013;Hollibaugh, 2017;Juottonen et al, 2020). These conditions occurred only at the bottom of Top Lake (Figure 1 and Table 1), in which pH was 7.59 at 45 m (in 2019) and photosynthetically active radiation (PAR) was ∼0% at 45 m (Klanten et al, 2021). The greater pH (7.94 and 8.15 for 2FB and Bottom lakes, respectively) and lower PAR values under the ice (3.46% at 5 m and 0.15% at 7 m for 2FB and Bottom lakes, respectively) may explain why Thaumarchaeota relative abundance was not as high at the bottom of 2FB and Bottom lakes.…”
Section: Top Lakementioning
confidence: 99%
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“…These ammonia-oxidizing archaea prefer aquatic habitats with low dissolved oxygen, pH, nutrients, and light (Erguder et al, 2009;Hatzenpichler, 2012;Auguet and Casamayor, 2013;Hollibaugh, 2017;Juottonen et al, 2020). These conditions occurred only at the bottom of Top Lake (Figure 1 and Table 1), in which pH was 7.59 at 45 m (in 2019) and photosynthetically active radiation (PAR) was ∼0% at 45 m (Klanten et al, 2021). The greater pH (7.94 and 8.15 for 2FB and Bottom lakes, respectively) and lower PAR values under the ice (3.46% at 5 m and 0.15% at 7 m for 2FB and Bottom lakes, respectively) may explain why Thaumarchaeota relative abundance was not as high at the bottom of 2FB and Bottom lakes.…”
Section: Top Lakementioning
confidence: 99%
“…Picocyanobacteria are often the dominant phytoplankton in terms of cell concentrations in cold, oligotrophic lakes, where their abundance can be increased by nutrient supply, (e.g., by mixing and nutrient entrainment in High Arctic Lake A; Veillette et al, 2011). The relatively higher TP yet overall oligotrophic conditions (Table 1) combined with high water transparency (Klanten et al, 2021) may have favored their relative abundance in Top Lake. Chloroflexi were mostly found at 20 m in Top Lake.…”
Section: Top Lakementioning
confidence: 99%
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