Abstract
We studied the transport of particulate organic carbon (POC) and dissolved organic carbon (DOC) in two regulated rivers during minimum and increasing discharges. Mean annual concentrations of total POC, measured monthly during conditions of minimum discharge from the dams, were twice as high at a station below a dam with a selective withdrawal system on the Kootenai River (KR, 0.15 mg 1−1), as at station below a dam with hypolimnetic water releases on the Flathead River (FR, 0.07 mg 1−1). Annual mean concentrations of DOC were similar below both dams (1.62 mg 1−1 FR; 1.71 KR). The percentage of POC in four size fractions differed in regulated and unregulated reaches of each river system; the smallest size fraction (0.45–10 smm) constituted a larger percentage of the total POC at the stations below the dams (50–93%), because POC in large size classes had settled out in the reservoir. The three largest size fractions (10–1000 µm) comprised a larger percentage of the total POC when samples were taken during conditions of full discharge from the dam. We measured large increases in all size classes of POC in samples collected during increasing discharges in a regulated reach, reflecting the component of sloughed periphyton and resuspended organic matter that were added during periods of hydropower generation at the dam. Seston (355 µm to 1 cm) collected in nets increased dramatically during increasing flows; concentrations of particulate organic matter (POM) in samples collected two and three hours after water levels began to rise were 572 and 1440 times higher than those collected during minimum discharge at the dam.
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Armitage, P. D. & M. H. Capper, 1976. The numbers, biomass and transport downstream of micro-crustaceans and Hydra from Cow Green Reservoir (Upper Teesdale). Freshwat. Biol. 6: 425–432.
Bilby, R. E. & G. E. Likens, 1979. Effect of hydrologic fluctuations on the transport of fine particulate organic carbon in a small stream. Limnol. Oceanogr. 24: 69–75.
Collier, K. J., R. J. Jackson & M. J. Winterbourn, 1989. Dissolved organic carbon dynamics of developed and undeveloped wetland catchments in Westland, New Zealand. Arch. Hydrobiol. 117: 21–38.
Cushing, C. E., Jr., 1963. Filter-feeding insect distribution and planktonic food in the Montreal River. Trans. am. Fish. Soc. 92: 216–219.
Gilvear, D. A., 1988. Suspended solids transport in the regulated River Blithe, Staffordshire, U.K. Regulated Rivers 2: 117–129.
Gore, J. A., 1977. Reservoir manipulations and benthic macroinvertebrates in a prairie river. Hydrobiologia 55: 113–123.
Gurtz, M. E., J. R. Webster & J. B. Wallace, 1980. Seston dynamics in southern Appalachian streams: effects of clearcutting. Can. J. Fish. aquat. Sci. 37: 624–631.
Grubaugh, J. W. & R. V. Anderson, 1989. Upper Mississippi River. Seasonal and floodplain forest influences on organic matter transport. Hydrobiologia 174: 235–244.
Hartman, R. T. & C. L. Himes, 1961. Phytoplankton from Pymatuning Reservoir in downstream areas of the Shenango River. Ecology 42: 180–183.
Heikkinen, K., 1989. Organic carbon transport in an undisturbed boreal humic river in northern Finland. Arch. Hydrobiol. 117: 1–19.
Hobbie, J. E. & G. E. Likens, 1973. Output of phosphorus, dissolved organic carbon, and fine particulate carbon from Hubbard Brook watersheds. Limnol. Oceanogr. 18: 734–742.
Kazmierczak, R. F. Jr., J. R. Webster & E. F. Benfield, 1987. Characteristics of seston in a regulated Applachian mountain river, U.S.A. Regulated Rivers 1: 287–300.
Klotz, R. L. & E. A. Matson, 1978. Dissolved organic carbon fluxes in the Shetucket River of eastern Connecticut, U.S.A. Freshwat. Biol. 8: 347–3550.
Kondratieff, P. F. & G. M. Simmons, 1984. Nutritive quality and size fractions of natural seston in an impounded river. Arch. Hydrobiol. 101: 401–412.
Lock, M. A. & T. E. Ford, 1986. Colloidal and dissolved organic carbon dynamics in undisturbed boreal forest catchments: a seasonal study of apparent molecular weight spectra. Freshwat. Biol. 16: 187–195.
Martin, D. B. & J. F. Novotny, 1977. Zooplankton standing crops in the discharge of Lake Francis Case, 1966–1972. Am. Midl. Nat. 98: 296–307.
Matter, W. J., P. L. Hudson & G. E. Saul, 1983. Invertebrate drift and particulate organic material transport in the Savannah River below Lake Hartwell during a peak power generation cycle. In T. D. Fontaine III & S. M. Bartell, (eds.), Dynamics of Lotic Ecosystems. Ann Arbor Science, Ann Arbor, MI: 357–370.
Menzel, D. W. & R. F. Vacarro, 1964. The measurement of dissolved organic and particulate carbon in seawater. Limnol. Oceanogr. 9: 138–142.
Merkley, W. B., 1978. Impact of Red Rock Reservoir on the Des Moines, River. In J. Cairns, Jr., E. F. Benfield & J. R. Webster (eds.), Current Perspectives on River-Reservoir Ecosystems. N. Am. Benthol. Soc., Springfield, I11.: 62–76.
Meyer, J. L., 1986. Dissolved organic carbon dynamics in two subtropical blackwater rivers. Arch. Hydrobiol. 108: 119–134.
Moeller, J. R., G. W. Minshall, K. W. Cummins, R. C. Petersen, C. E. Cushing, J. R. Sedell, R. A. Larson & R. L. Vannote, 1979. Transport of dissolved organic carbon in streams of differing physiographic characteristics. Organic Geochem. 1: 139–150.
Moore, T. R. & R. J. Jackson, 1989. Dynamics of dissolved organic carbon in forested and disturbed catchments, Westland, New Zealand. 2. Larry River. Wat. Resour. Res. 25: 1311–1339.
Naiman, R. J., 1982. Characteristics of sediments and organic carbon export from pristine boreal forest watersheds. Can. J. Fish. aquat. Sci. 39: 1699–1718.
Naiman, R. J. & J. R. Sedell, 1979. Characterization of particulate organic matter transported by some Cascade mountain streams. J. Fish. Res. Bd Can. 36: 17–31.
Newbern, L. A., J. R. Webster, E. F. Benfield & J. H. Kennedy, 1981. Organic matter transport in an Appalachian Mountain river in Virginia, U.S.A. Hydrobiologia 83: 73–83.
Parker, C. R. & J. R. Voshell, Jr., 1983. Production of filter-feeding Trichoptera in an impounded and a free-flowing river. Can. J. Zool. 61: 70–87.
Perry, S. A., 1984. Comparative Ecology of Benthic Communities in Natural and Regulated Areas of the Flathead and Kootenai Rivers, Montana. Ph.D. Dissertation, North Texas State Univ., Denton, Texas, 359 pp.
Perry, S. A. & W. B. Perry, 1986. Effects of experimental flow regulation on invertebrate drift and stranding in the Flathead and Kootenai Rivers, Montana, USA. Hydrobiologia 134: 171–182.
Sedell, J. R., R. J. Naiman, K. W. Cummins, G. W. Minshall & R. L. Vannote, 1978. Transport of particulate organic material in streams as a function of physical processes. Verh. int. Ver. Limnol. 20: 1366–1375.
Soltero, R. A., J. C. Wright & A. A. Horpestad, 1973. Effects of impoundment on the water quality of the Bighorn River. Wat. Res. 7: 343–354.
Spence, J. A. & H. B. N. Hynes, 1971. Differences in benthos upstream and downstream of an impoundment. J. Fish. Res. Bd Can. 28: 35–43.
Stanford, J. A. & J. V. Ward, 1983. The effects of mainstream dams on physicochemistry of the Gunnison River, Colorado, Chapter 4. In D. Adams & V. Lamarra (eds.), Aquatic Resources Management of the Colorado River Ecosystem. Ann Arbor Science, Ann Arbor, MI: 43–56.
U.S. Geological Survey, 1981. Water Resources Data for Montana. Volume 2: Upper Columbia River Basin, Water Year 1980. MT-80-2, Helena, MT.
U.S. Geological Survey, 1982. Water Resources Data for Montana. Volume 2: Upper Columbia River Basin, Water Year 1981. MT-81-2, Helena, MT.
Voshell, J. R. & C. R. Parker, 1985. Quantity and quality of seston in an impoundment and a free-flowing river in Virginia, U.S.A. Hydrobiologia 122: 271–280.
Voshell, J. R., G. M. Simmons & S. A. Perry, 1985. An Ecological Investigation of the New River and Bluestone Lake. Final Report to U.S. Army Corps of Engineers, Huntington, West Virginia, 208 pp.
Ward, J. V., 1975. Downstream fate of zooplankton from a hypolimnial release mountain resservoir. Verh. int. Ver. theor. angew. Limnol. 19: 1798–1804.
Webster, J. R., E. F. Benfield & J. Cairns, Jr., 1979. Model predictions of effects of impoundment of particulate organic matter transport in a river system. In J. V. Ward & J. A. Stanford (eds.), The Ecology of Regulated Streams. Plenum Press, NY: 339–364.
Webster, J. R., M. E. Gurtz, J. J. Hains, J. L. Meyer, W. T. Swank, J. B. Waide & J. B. Wallace, 1983. Stability of stream ecosystems. In J. R. Barnes & G. W. Minshall (eds.), Stream Ecology. Plenum Press, NY: 355–393.
Webster, J. R., E. F. Benfield, S. W. Golladay, R. F. Kazmierczak, Jr., W. B. Perry & G. T. Peters, 1988.Effects of watershed disturbance on stream seston characteristics. In W. T. Swank & D. A. Crossley, Jr. (eds.), Forest Hydrology and Ecology at Coweeta. Springer-Verlag, NY: 279–294.
Wetzel, R. G., 1975. Primary production. In B. A. Whitton (ed.), River Ecology. University of California Press, Los Angeles, California: 230–247.
Wetzel, R. G. & B. A. Manny, 1977. Seasonal changes in particulate and dissolved organic carbon and nitrogen in a hardwater stream. Arch. Hydrobiol. 80: 20–39.
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Perry, S.A., Perry, W.B. Organic carbon dynamics in two regulated rivers in northwestern Montana, USA. Hydrobiologia 218, 193–203 (1991). https://doi.org/10.1007/BF00038835
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DOI: https://doi.org/10.1007/BF00038835