Journal article
Lake metabolism scales with lake morphometry and catchment conditions
Department of Ecoscience - Marine Diversity and Experimental Ecology, Department of Ecoscience, Technical Sciences, Aarhus University
University of Copenhagen
Freshwater Biology
We used a comparative data set for 25 lakes in Denmark sampled during summer to explore the influence of lake morphometry, catchment conditions, light availability and nutrient input on lake metabolism. We found that (1) gross primary production (GPP) and community respiration (R) decline with lake area, water depth and drainage ratio, and increase with algal biomass (Chl), dissolved organic carbon (DOC) and total phosphorus (TP); (2) all lakes, especially small with less incident light, and forest lakes with high DOC, have negative net ecosystem production (NEP < 0); (3) daily variability of GPP decreases with lake area and water depth as a consequence of lower input of nutrients and organic matter per unit water volume; (4) the influence of benthic processes on free water metabolic measures declines with increasing lake size; and (5) with increasing lake size, lake metabolism decreases significantly per unit water volume, while depth integrated areal rates remain more constant due to a combination of increased light and nutrient limitation.
Overall, these meta-parameters have as many significant but usually weaker relationships to whole-lake and benthic metabolism as have TP, Chl and DOC that are directly linked to photosynthesis and respiration. Combining water depth and Chl to predict GPP, and water depth and DOC to predict R, lead to stronger multiple regression models accounting for 57–63% of the variability of metabolism among the 25 lakes.
It is therefore important to consider differences in lake morphometry and catchment conditions when comparing metabolic responses of lakes to human impacts.
Language: | English |
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Publisher: | SP Birkhäuser Verlag Basel |
Year: | 2012 |
Pages: | 155-169 |
Journal subtitle: | Research Across Boundaries |
ISSN: | 14209055 and 10151621 |
Types: | Journal article |
DOI: | 10.1007/s00027-011-0207-6 |
ORCIDs: | 0000-0001-8382-984X and Stedmon, Colin |
Catchment conditions Ecology Freshwater & Marine Ecology Intrinsic drivers Lake metabolism Lake morphometry Life Sciences Life Sciences, general Marine & Freshwater Sciences Oceanography Temporal variability catchment conditions intrinsic drivers lake metabolism lake morphometry temporal variability