LogoCdd CDD

Northern Quebec

Dataset code QUE

Contact: Reinhard Pienitz, Marie-Andrée Fallu
Collection date: July 21, 1995 to August 11, 1995

Dataset info

Research area
Longitude
-78.22° to -75.72°
Latitude
49.80° to 59.53°
Publication
  • 2000, Fallu, M.-A., Allaire, N. and Pienitz, R.
  • 1999, Fallu, M.-A. and Pienitz, R.
Main publication summary

Fallu, M.-A. and Pienitz, R. 1999. Diatomees lacustres de Jamesie-Hudsonie (Quebec) et modele de reconstitution des concentrations de carbone organique dissous. Ecoscience 6 (4) :603-620

Freshwater diatoms are more and more frequently used in paleoenvironmental studies. The purpose of this research was to assess their potential as bioindicators in a region where little information exists about diatoms. A total of 516 diatom species were identified in the surface sediments of 59 lakes located along a latitudinal gradient in northern Québec. The use of multivariate analysis allowed to determine the environmental variables (among 49) which had the greatest influence on diatom community composition. The concentrations of magnesium, sodium, dissolved organic carbon (DOC) and silica, as well as water depth seemed to be the most influential variables. An inference model for DOC has been developed which is useful for paleolimnological reconstructions of past DOC concentrations, as well as other variables that are correlated with DOC, such as catchment inputs, water temperature, water transparency and UV penetration.

Environmental and physical data
Bylot Island, Nunavut, Canada. (BYL dataset: 27 sampled lakes)

Average Maximum Minimum N (samples)
K mg/L 0.30 1.40 0 58
Li ug/L 0.26 1 0 58
Mg mg/L 0.71 4.30 0.20 58
Mn ug/L 7.98 33 1.20 58
Mo ug/L 0.02 1 0 58
Na mg/L 2.98 28.30 0.60 58
NH3 ug/L 2.21 18 0 58
Ni ug/L 0.52 3 0 58
NO2 ug/L 2.40 8 0 58
NO3 ug/L 0.12 3.70 0 58
Pb ug/L 0.17 5 0 58
pH 6.65 8.20 5.10 58
PN ug/L 105.86 1400 10 58
POC ug/L 986.55 12700 250 58
POC:PN 10.33 29 6.22 58
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