Authors: Lim, Darlene S.S.; Laval, B.E.; Slater, G.; Antoniades, D.; Forrest, A.L.; Pike, W.; Pieters, R.; Saffari, M.; Reid, D.; Schulze-Makuch, D.; Andersen, D.; McKay, C.P.

Source: Fundamental and Applied Limnology / Archiv für Hydrobiologie, Volume 173, Number 4, January 2009 , pp. 329-351(23)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

Abstract:

The objectives of this study are two-fold: (1) to describe and quantify the seasonal physical and chemical limnological properties of Pavilion Lake, a microbialite-rich lake in British Columbia, Canada, and (2) to gain a broader limnological context of Pavilion Lake by examining the limnology and hydrology of the lakes and groundwater systems in the area (∼30 km radius). Pavilion Lake is a dimictic lake with annual ice-cover. It is a hard water (mean CaCO₃ = 181.8 mg L^-1), ultra-oligotrophic (mean Total Phosphorus [TP] = 3.3 μg L^-1) lake, that is groundwater fed most likely through diffuse, low velocity local and regional sources. Principal Components Analysis (PCA) separated Pavilion Lake from the other groundwater, stream and lake samples along a conductivity and pH gradient on Axis 1 (λ₁ = 0.392), and a nutrient (Total Nitrogen [TN], TP) and K⁺, Mg²⁺, Si gradient on the second axis (λ₂ = 0.160). Pavilion Lake has the lowest Ca²⁺ and TP concentrations, and the highest Na⁺ concentrations and optical transmissivity amongst all sampled sites. Furthermore, the lake is characterized by low sedimentation rates. These characteristics are potentially important factors in supporting the past and on-going development of microbialites within the lake. Our study provides a limnochemical reference to consider in the conceptualization of ideal environments supporting large-scale microbialites.

Keywords: HARD WATER LAKE; ULTRA-OLIGOTROPHIC LAKE; GROUNDWATER SYSTEMS; PALEOLIMNOLOGY

Document Type: Research article

DOI: http://dx.doi.org/10.1127/1863-9135/2009/0173-0329

Publication date: 2009-01-01

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