Long-term lake acidification trends in high- and low-sulphate deposition regions from Nova Scotia,Canada |
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Authors: | Brian K Ginn Brian F Cumming John P Smol |
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Institution: | (1) Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen’s University, Kingston, Ontario, Canada, K7L 3N6 |
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Abstract: | Diatom-based paleolimnological techniques were used to study 14 lakes from two regions of Nova Scotia which represent regions
of high and low sulphate deposition. Using decadal scale intervals, changes in diatom assemblages and diatom-inferred pH were
tracked in relation to deposition of anthropogenic-sourced strong acids. Eight study lakes were located in Kejimkujik National
Park in the southwestern part of the province, which receives an annual sulphate deposition (2000–2002) of ~10.5 kg ha−1 yr−1. These lakes showed significant changes in diatom assemblages with overall diatom-inferred acidification of ~0.5 pH units
starting between 1925 and 1940, with the timing of acidification related to pre-industrial (or pre−1850) lakewater pH. Six
study lakes were located in Cape Breton Highlands National Park, in northern Nova Scotia, a region of lower sulphate deposition.
These lakes did not show any consistent trends in diatom assemblages or inferred pH values consistent with recent acidic deposition,
but rather variations that may be related to climatic influences. Nova Scotia lakes that have been most impacted by acidic
deposition had the lowest pre-industrial lakewater pH values and were in an area of relatively high sulphate deposition.
Handling editor: K. Martens |
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Keywords: | Nova Scotia Acidification Diatoms Paleolimnology |
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