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Title Carbon dioxide sequestration and heterotrophy in shallow lakes.
Publication Date
Date Accessioned
Degree PhD
Discipline/Department Ecology, Evolution and Behavior
Degree Level doctoral
University/Publisher University of Minnesota
Abstract Research has recently begun to show the importance of lakes in controlling global CO2 budgets, but this work has only been done on a few large lakes. Small, shallow lakes and wetlands are the most plentiful lake ecosystems in world, but the most ignored. Here, I explore their ability to sequester CO2 and in some cases release the greenhouse gas to atmosphere. I found that pristine shallow lakes where macrophytes (aquatic vegetation) dominated, the lakes sequestered much more CO2 than disturbed lakes where phytoplankton dominated. Furthermore, I found that heterotrophs in shallow lakes respired tremendous amounts of carbon of terrestrial origin, thus calling into question the net ability of terrestrial ecosystems to sequester carbon. Finally, I found that some of the underlying mechanisms, including the productivity of different autotrophs and growth efficiencies of bacteria, favor greater carbon sequestration by macrophyte-rich shallow lakes. All of my observations form a basis for future work into the ability of shallow lakes to sequester CO2 and stresses the importance of not only saving shallow lakes and wetlands, but preserving them in a macrophyte-rich state.
Subjects/Keywords Alternative stable state; Bacterial Growth Efficiency and Stoichiometry; Carbon Dioxide; CO2; Methane; CH4; Carbon Sink; Net autotrophy; Net heterotrophy; Macrophyte; Shallow Lakes; Wetlands; Ecology, Evolution and Behavior
Language en
Country of Publication us
Record ID oai:conservancy.umn.edu:11299/57170
Repository umn
Date Retrieved
Date Indexed 2020-03-09
Note [] University of Minnesota Ph.D. dissertation. October 2009. Major: Ecology, Evolution and Behavior. Advisor: Dr. Jim Cotner. 1 computer file (PDF); vi, 207 pages, appendices A-H.;

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…respiration rates of phytoplankton and macrophytes that affect the balance between net heterotrophy and autotrophy. 2 If the shallow lakes are net heterotrophic, where does that extra carbon come from to allow bacterial respiration to exceed photosynthesis…