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ISSN : 2288-1115(Print)
ISSN : 2288-1123(Online)
Korean Journal of Ecology and Environment Vol.45 No.2 pp.174-189
DOI :

인공호의 부영양화에 따른 피라미(Zacco platypus) 개체군의 전장-체중 관계 및 비만도 지수

고대근, 한정호, 안광국*
충남대학교 생명시스템과학대학 생물과학과

Length-Weight Relations and Condition Factor (K) of Zacco platypus Along Trophic Gradients in Reservoir Ecosystems

Kwang-Guk An*, Dae-Geun Ko, Jeong-Ho Han
Department of Biological Science, College of Biological Sciences and Biotechnology, Chungnam National University
(Manuscript received 30 January 2012, Revised 15 March 2012, Revision accepted 10 April 2012)

Abstract

The objective of this study was to determine the weight-length relations and conditionfactor (K) of Zacco platypus, along the trophic gradients from oligotrophic toeutrophic state in six reservoir ecosystems (BaR, YyR, JyR, GpR, YdR, and MsR), during2008~2010. The species was selected as a sentinel species for the study, due to itswide distribution and wide trophic gradient. The analysis of trophic state index (TSI),based on total phosphorus (TP) and chlorophyll-a (Chl-a), indicated that reservoirsof YyR and BaR were classified as to be in an oligotrophic state (30~40), the JyR andGpR as mesotrophic (40~50), and the YdR and MsR as eutrophic state (50~70). Total47 species and 26,226 individuals were sampled from 6 reservoirs and sensitive speciesdominated in the oligotrophic reservoirs (YyR and BaR). In the mean time, the tolerantspeciesdominated the community in the mesotrophic (JyR and GpR) and eutrophic(YdR and MsR) reservoirs. Regression analysis of body weight, against the total length,indicated that the regression coefficient (b value) was lower in the oligotrophic reservoir(2.77~2.79) than the mesotrophic (3.07~3.17) and eutrophic reservoirs (3.15~3.21). This result suggests that the population growth rate Zacco platypus reflectedthe trophic gradients of the reservoirs. The analysis of condition factor (K) againstthe total length showed positive slopes (b>3.0) in mesotrophic and eutrophic reservoirs,and a negative slope (b<3.0) in oligotrophic reservoir. The variation of the regressionslope of “b” in Z. platypus was accounted for 79.7% [b=0.012×TSI (TP)+2.395,p=0.017] by the variation of TSI (TP) and 82.2% [b=0.013×TSI (Chl-a)+2.36, p=0.013]by the variation of TSI (Chl-a). The proportion of DELT abnormality increased as thetrophic state increases in the reservoirs. The overall data suggest that the growth ofthe fish populations, based on the length-weight relations and condition factor, reflectedthe trophic state of nutrient and phytoplankton biomass of the reservoir waters.Thus, in spite of the tolerant characteristics of Z. platypus, hypertrophic states mightnegatively affect the health of the population.

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