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28 December 2021 Diatom Sedimentary Assemblages and Holocene pH Reconstruction from the Canadian Arctic Archipelago's Largest Lake
Biljana Narancic, Émilie Saulnier-Talbot, Guillaume St-Onge, Reinhard Pienitz
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Abstract

The Arctic has warmed significantly over the past decades. However, the evolution of Arctic climate during the Holocene remains to be clarified in more detail, and regional factors controlling aquatic ecosystem evolution need to be better defined to grasp the sensitivity of lakes to rapid environmental change. Nettilling Lake was studied for changes in sedimentary diatom assemblages over the last 5 000 years. Lake water pH was reconstructed by applying a diatom-based lake water pH inference model. We hypothesized that the changes in diatom assemblages were driven by variations in lake water transparency and attendant water turbidity associated with the input of fine suspended solids from glacial meltwaters. Reduced underwater light resulted in greater abundance of planktonic over benthic taxa from ca. 5 000 to 3 000 yrs. cal. BP, followed by less turbid conditions and proliferation of benthic taxa during regional cooling. The lake water was slightly alkaline throughout the Holocene, ranging between pH 7.1 and 7.7. Our results support the notion that hydrological processes, dependent on climate variations, have a first-order influence on the regulation of the lake water pH through glacial meltwater inputs, which will likely continue to control the lake's long-term chemical and biological evolution.

2021 Université Laval
Biljana Narancic, Émilie Saulnier-Talbot, Guillaume St-Onge, and Reinhard Pienitz "Diatom Sedimentary Assemblages and Holocene pH Reconstruction from the Canadian Arctic Archipelago's Largest Lake," Ecoscience 28(3-4), 347-360, (28 December 2021). https://doi.org/10.1080/11956860.2021.1926642
Received: 17 November 2020; Accepted: 25 April 2021; Published: 28 December 2021
JOURNAL ARTICLE
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KEYWORDS
acidité lacustre
diatomées
diatoms
Lac Nettilling
lake acidity
Nettilling Lake
paléoclimat
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