Abstract
Phosphorus regeneration from lake sediments, and subsequent migration to trophogenic surface water, significantly contributes to the lake nutrient budgets and algal bloom conditions in some lake types. Decomposition of organic matter in deep water and sediments results in the accumulation of regenerated nutrients, alternate electron acceptors (reduced products of anaerobic respiration = COD), carbon dioxide, and depletion of dissolved oxygen (electron acceptor in aerobic respiration). Thermal stratification creates spatial segregation of trophogenic and tropholytic environments in the lake, resulting in gradients between sediments, hypolimnion, and the epilimnion. Exchange of oxygen, nutrients, and reduced alternate electron acceptors between the hypolimnion and epilimnion affects the productivity of a lake.
Secchi depth, temperature, and dissolved oxygen profiles were determined twice each week from May 1980 to October 1980 at each of five lake stations. Nutrient concentration profiles, including total soluble and total phosphorus, ammonium-N, nitrate, soluble Kjeldahl, and total Kjeldahl nitrogen were determined twice each month. Epilimnetic algal samples were collected twice each week using Kemmerer and water column ‘straw’ amplers. Cell counts of total, green, bluegreen, and diatom algae groups were made. Three methods were used to describe hypolimnetic-epilimnetic exchange, including coefficients of eddy diffusion (based on lake heat budget), a graphical method of defining thermocline location, and relative thermal resistance to mixing (RTRM, based on density differences). All three methods yeilded comparable estimates of net seasonal transport. The graphical and RTRM methods described events occurring at shorter intervals (greater resolution).
We find general agreement between the three methods of describing hypolimnetic-epilimnetic transport. The frequency of sampling resulted in increased resolution of thermal profiles (in time), allowing accurate estimation of short-term nutrient flux into epilimnetic waters. An algal bloom event occurred 5 to 12 days following erosion of the top of the metalimnion to below the aerobic-anaerobic interface. The lag time to peak algal concentration, following such events, decreased through the summer (June = 12 days, September = 5 days)
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References
American Public Health Association, 1971. Standard Methods for the Examination of Water and Wastewater, 13th edn. A.P.H.A., Washington, D.C. 874 pp
Bachman, R. W. & Goldman, C. R., 1965. Hypolimnetic heating in Castle Lake, California. Limnol. Oceanogr. 10: 233–239.
Hutchinson, G. E., 1941. Limnological studies in Connecticut. IV. Mechanisms of intermediary metabolism in stratified lakes. Ecol. Monogr. 9: 537–582.
Hutchinson, G. E., 1957. A Treatise on Limnology, Vol. I. Wiley, New York. 1015 p. 1967. A Treatise on Limnology, Vol. II. Wiley, New York 1115 pp.
Idso, S. B. & Cole, G. A., 1973. Studies on a Kentucky knobs lake: V. Some aspects of the vertical transport of heat in the hypolimnion. J. Ecol. 61: 413–420.
Miller, M. C. & Reed, J. P., 1975. Benthic metabolism of arctic coastal ponds, Barrow, Alaska. Int. Verh. Theor. Angew. Limnol. Verh. 19: 459–465.
Powell, T. & Jassby, A., 1974. The estimation of vertical eddy diffusivities below the thermocline in lakes. Water Resour. Res. 10: 191–198.
Rich, P. H., 1979. Differential C02 and 02 benthic community metabolism in a soft-water lake. J. Fish. Res. Bd Can. 36: 1377–1389.
Schiller, R. W., McGinness, W. V. & Rich, P. H., 1978. An analysis of the sources and impacts of phosphorus and nitrogen in Lake Waramaug. Report 4242–619. Center for the Environment and Man, Hartford, Connecticut. 65 pp.
Stauffer, R. E. & Lee, G. F., 1974. The role of thermocline migration in regulating algal blooms. In: Middlebrooks, E. J., Falkenborg, D. H. & Maloney, T. E. (edsEds.) Modeling the Eutrophication Process, pp 73–82. Ann Arbor Science Publishers, Ann Arbor, Michigan.
U. S. Geological Survey, 1980. Lake Waramaug Survey, U.S.G.S., Hartford, Connecticut. 81–477.
Vallentyne, J. R., 1957. Principles of modern limnology. Am. Sci. 45: 218–244.
Wetzel, R. G., 1975. Limnology. Saunders, Philadelphia. 843 pp.
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Kortmann, R.W., Henry, D.D., Kuether, A. et al. Epilimnetic nutrient loading by metalimnetic erosion and resultant algal responses in Lake Waramaug, Connecticut. Hydrobiologia 91, 501–510 (1982). https://doi.org/10.1007/PL00020039
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DOI: https://doi.org/10.1007/PL00020039