Impacts of dam discharge on river environments and phytoplankton communities in a regulated river system, the lower Han River of South Korea
2
조회
0
다운로드
5
인용
0
참고문헌
키워드
초록
To understand the effects of fluctuations in dam discharge due to river environments and phytoplankton communities,we monitored such environments and phytoplankton communities biweekly, from February 2001 to February 2002 andfrom February 2004 to February 2005, in the lower Han River (LHR), South Korea. The phytoplankton abundance duringthe dry season was approximately two times higher than that during the rainy season. In particular, fluctuations indiatom assemblages, which constituted over 70% of the total phytoplankton abundance, were affected severely by thechanges in the discharge. When a large quantity of water in a dam was discharged into the LHR, the conductivity and theconcentrations of total nitrogen (TN), total phosphorus (TP), and dissolved inorganic phosphorus (DIP) decreased rapidly,whereas the concentrations of suspended solids (SS), dissolved inorganic nitrogen (DIN), and dissolved silica (DSi)increased immediately. Time-delayed relationship also revealed that the dam discharge had an immediately significantnegative relationship with phytoplankton abundance. On the whole, fluctuations in phytoplankton communities in theLHR were influenced much more by hydrodynamics such as dam discharge than by the availability of nutrients. Thus, thevariability in these concentrations usually parallels the strength of river flow that is associated with summer rainfall, withhigher values during periods of high river discharge.
Abstract
To understand the effects of fluctuations in dam discharge due to river environments and phytoplankton communities,we monitored such environments and phytoplankton communities biweekly, from February 2001 to February 2002 andfrom February 2004 to February 2005, in the lower Han River (LHR), South Korea. The phytoplankton abundance duringthe dry season was approximately two times higher than that during the rainy season. In particular, fluctuations indiatom assemblages, which constituted over 70% of the total phytoplankton abundance, were affected severely by thechanges in the discharge. When a large quantity of water in a dam was discharged into the LHR, the conductivity and theconcentrations of total nitrogen (TN), total phosphorus (TP), and dissolved inorganic phosphorus (DIP) decreased rapidly,whereas the concentrations of suspended solids (SS), dissolved inorganic nitrogen (DIN), and dissolved silica (DSi)increased immediately. Time-delayed relationship also revealed that the dam discharge had an immediately significantnegative relationship with phytoplankton abundance. On the whole, fluctuations in phytoplankton communities in theLHR were influenced much more by hydrodynamics such as dam discharge than by the availability of nutrients. Thus, thevariability in these concentrations usually parallels the strength of river flow that is associated with summer rainfall, withhigher values during periods of high river discharge.
참고문헌 (24)
- APHA., "Standard methods for the examination of water and wastewater", American Public Health Association, ~ (1995)
- Bahnwart M, "Downstream changes in phytoplankton composition and biomass in a lowland river-lake system (Warnow River, Germany)", Hydrobiologia, 391, pp.99~111 (1999)
- Brett MT, "A meta-analysis of the freshwater trophic cascade", Proc Natl Acad Sci USA, 93, pp.7723~7726 (1996)
- Domingues RB, "Phytoplankton composition, growth and production in the Guadinan estuary(SW Iberia) : unraveling changes induced after dam construction", Sci Total Environ, 416, pp.300~313 (2012)
- Dynesius M, "Fragmentation and flow regulation of river systems in the northern third of the world", Science, 266, pp.753~762 (1994)
- Gosselain V, "The phytoplankton community of the River Meuse, Belgium : seasonal dynamics(year 1992)and the possible incidence of zooplankton grazing", Hydrobiologia, 289, pp.179~191 (1994)
- Ha K, "The phytoplankton succession in the lower part of hypertrophic Nakdong River (Mulgum), South Korea", Hydrobiologia, 369-370, pp.217~227 (1998)
- Hallegraeff GM, "A review of harmful algae blooms and their apparent global increase", Phycologia, 32, pp.79~99 (1993)
- Hötzel G, "Long-term phytoplankton monitoring of the Darling River at Burtundy, New South Wales : incidence and significance of cyanobacterial blooms", Mar Freshw Res, 45, pp.747~759 (1994)
- Humborg C, "Effect of Danube river dam on black sea biogeochemistry and ecosystem structure", Nature, 386, pp.385~388 (1997)
- Hutchinson GE, "The paradox of the plankton", Am Nat, 95, pp.137~145 (1961)
- Jeong KS, "Delayed influence of dam storage and discharge on the determination of seasonal proliferations of Microcystis aeruginosa and Stephanodiscus hantzschii in a regulated river system of the lower Nakdong River (South Korea)", Water Res, 41, pp.1269~1279 (2007)
- Jung SW, "Effects of temperature and nutrient depletion and reintroduction on growth of Stephanodiscus hantzschii (Bacillariophyceae): implications for the blooming mechanism", J Freshw Ecol, 26, pp.115~121 (2011)
- Kim HI, "A study on the contaminant transport characteristics in Han River", Korea Water Resour Assoc, 31, pp.85~93 (1998)
- Lamouroux N, "Simple predictions of instream habitat model outputs for target fish populations", Freshw Biol, 47, pp.1543~1556 (2002)
- Mason CF., "Biology of freshwater pollution" (2002), Pearson
- McKee LJ, "Influence of climate, geology and humans on spatial and temporal nutrient geochemistry in the subtropical Richmond River catchment, Australia", Mar Freshw Res, 52, pp.235~248 (2001)
- Park SB, "The impact of Jangma (monsoon rainfall) on the changes of water quality in the lower Nakdong River (Mulgeum)", Korean J Limnol, 35, pp.161~170 (2002)
- Sellner KG, "Zooplankton grazing in a Potomac River cyanobacterial bloom", Estuaries Coast, 16, pp.859~872 (1993)
- Shapiro J, "Lake restoration by biomanipulation : Round lake, Minnesota, the first two years", Freshw Biol, 14, pp.371~383 (1984)
- Søballe DM, "A large-scale comparison of factors influencing phytoplankton abundance in rivers, lakes, and impoundments", Ecology, 68, pp.1943~1954 (1987)
- Sullivan BE, "Seasonal ity of phytoplankton production in the Columbia River: a natural or anthropogenic pattern?", Geochim Cosmochim Acta, 65, pp.1125~1139 (2001)
- Webster IT, "Management strategies for cyanobacterial blooms in an impounded lowland river", Regul Rivers Res Mgmt, 16, pp.513~525 (2000)
- Zeng H, "Distribution of phytoplankton in the Three-Gorge Reservoir during rainy and dry seasons", Sci Total Environ, 367, pp.999~1009 (2006)