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KMID : 1024520140230071321
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Journal of the Environmental Sciences
2014 Volume.23 No. 7 p.1321 ~ p.1332
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Influence of Seasonal Monsoon on Trophic State Index (TSI), Empirical Water Quality Model, and Fish Trophic Structures in Dam and Agricultural Reservoirs
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Yun Young-Jin
Han Jeong-Ho
An Kwang-Guk
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Abstract
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The key objective of this study was to evaluate trophic state and empirical water quality models along with analysis
of fish trophic guilds in relation to water chemistry (N, P). Trophic state index (TSI), based on total phosphorus (TP)
and chlorophyll-a (CHL), ranged between oligotrophic and hypereutrophic state, by the criteria of Nurnberg(1996), and
was lower than the trophic state of total nitrogen (TN). Trophic relations of Secchi depth (SD), TN, TP, and CHL were
compared using an empirical models of premonsoon (Pr), monsoon (Mo), and postmonsoon (Po). The model analysis
indicated that the variation in water transparency of Secchi depth (SD) was largely accounted (p < 0.001, range of R2
:0.76?0.80) by TP during the seasons of Mo and Po and that the variation of CHL was accounted (p < 0.001, R2=
0.70) up to 70% by TP during the Po season. The eutrophication tendency, based on the TSITP vs. TSIN:P were
predictable (R2 ranged 0.85?0.90, p < 0.001), slope and y intercept indicated low seasonal variability. In the mean
time, TSIN:P vs. TSICHL had a monsoon seasonality in relation to values of TSIN:P during the monsoon season due to a
dilution of reservoir waters by strong monsoon rainfall. Trophic compositions of reservoir fish reflected ambient
contents of TN, TP, and CHL in the reservoir waters. Thus, the proportions of omnivore fish increased with greater
trophic conditions of TP, TN and CHL and the proportions of insectivore fish decreased with greater trophic
conditions.
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KEYWORD
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Artificial reservoir, Empirical water quality model, Trophic guild
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