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Interannual variability in trophic status of shallow lakes on the boreal Plain: Is there a climate signal? Open Access

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Author or creator
Sass, G.Z.
Creed, I.F.
Bayley, S.E.
Devito, K.J.
Additional contributors
Subject/Keyword
communities
landscapes
vegetation
western boreal
chlorophyll
phosphorus
Canada
temperate lake
ecosystems
water-level
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
We explored relations between climate and trophic status of shallow lakes (lake area > 5 ha, mean depth < 3.2 m) located on the subhumid western Boreal Plain of Canada. Correlation and regression analyses were used to assess the association between indicators of climate and satellite-based estimates of trophic status (chlorophyll a (Chl a)). Chl a was derived using red band reflectance of Landsat satellite images for 76 lakes, which were then averaged for each year to produce a landscape median for summer (August) over a 20-year period from 1984 and 2003. Our results showed that climate was related to interannual changes in trophic status. Average May temperature was positively correlated to Chl a, suggesting the importance of conditions in the early part of the growing season. Growing season effective precipitation (P – PET) was negatively correlated to Chl a such that wetter conditions seemed to lead to a dilution of Chl a. Very wet years resulted in a larger Chl a drop than one expected by a linear model, suggesting greater water contribution from the landscape. P – PET explained 64% of the variance in Chl a using a nonlinear regression tree. Our study offers clues as to how shallow lake systems may behave on the subhumid Boreal Plain as a function of future climate change.
Date created
2008
License information
Rights
An edited version of this paper was published by AGU. Copyright 2008 by the American Geophysical Union.
Citation for previous publication
GZ Sass, IF Creed, SE Bayley and KJ Devito. "Interannual variability in trophic status of shallow lakes on the boreal Plain: Is there a climate signal?" Water Resources Research 44 (2008): doi:10.1029/2007WR006310.
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