Production and Respiration in Lake Erie Plankton Communities |
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| Affiliation: | 1. Michigan Tech Research Institute (MTRI), Michigan Technological University, 3600 Green Ct., Ste 100, Ann Arbor, MI 48105, USA;2. National Oceanic and Atmospheric Administration (NOAA)/Great Lakes Environmental Research Laboratory (GLERL), 4840 S. State Rd, Ann Arbor, MI 48108, USA;3. Cooperative Institute for Limnology and Ecosystems Research (CILER), University of Michigan, 4840 S. State Rd, Ann Arbor, MI 48108, USA;4. Nansen International Environmental and Remote Sensing Centre (NIERSC), 7, 14th Line, office 49, Business Centre “Preobrazhensky”, Vasilievsky Island, 199034 St. Petersburg, Russia;1. Cooperative Institute of Limnology and Ecosystems Research (CILER), School of Natural Resources and Environments, University of Michigan, Ann Arbor, Michigan 48108, USA;2. Department of Civil Engineering, Queen''s University, Kingston, Ontario K7L 3N6, Canada;3. Water Center, Graham Sustainability Institute, University of Michigan, 625 East Liberty Road, Ann Arbor, MI 48193, USA;4. Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, Columbus, OH 43210, USA;1. National Oceanic and Atmospheric Administration, National Centers for Coastal Ocean Science, Silver Spring, MD 20910, United States;2. National Center for Water Quality Research, Heidelberg University, Tiffin, OH 44883, United States;1. Water Center, Graham Sustainability Institute, University of Michigan, 625 E. Liberty St., Suite 300, Ann Arbor, MI 48104, USA;2. Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Campus Box 7908, Raleigh, NC27695-7908, USA;3. NOAA Great Lakes Environmental Research Laboratory, 4840 S. State Rd., Ann Arbor, MI 48108, USA;1. F.T Stone Laboratory, The Ohio State University and Ohio Sea Grant, 878 Bayview Ave. Put-in-Bay, OH 43456, United States of America;2. Consolidated Safety Services Inc., Fairfax, VA, United States of America;3. Division of Natural Science, Applied Science, and Mathematics, Defiance College, Defiance, OH, United States of America;4. Department of Biology, Kent State University, Kent, OH, United States of America;5. National Centers for Coastal Ocean Science, National Ocean Service, National Oceanic Atmospheric Administration, Silver Spring, MD, United States of America |
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| Abstract: | Planktonic community metabolism (photosynthesis and respiration) was assessed in the oligotrophic east basin of Lake Erie, from November 2001 to October 2002 using O2 and 14C methods. Areal gross production (AGP; mmol O2 m−2 d−1) exceeded areal respiration (AR; mmol O2 m−2 d−1) in the surface mixed layer for 69% of the observations during the study period. The median AGP:AR for the entire study period was 1.32. A significant positive relationship between AGP and AR existed, but AGP explained only 25% of the variation in AR. AGP:AR varied seasonally, being below 1.0 in the fall/winter of 2001 and in early spring 2002. High (>> 1.0) AGP:AR was observed in late spring (May) and AGP:AR remained > 1.0 for most of the summer stratified period (July–September). AGP:AR was > 1.0 in the fall of 2002, but the magnitude was less than observed during spring. The results supported traditional concepts of the seasonal production and consumption cycles in planktonic communities of large oligotrophic lakes. Parallel incubations of 14C uptake and gross O2 production determined with the light and dark bottle method revealed a mean experimental gross photosynthetic quotient (PQG) of 1.29 ± 0.48, indicating that the 14C method used here had a variable but, on average, close relationship to gross production as it is commonly measured. |
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