| Title |
Estimation of Habitat Suitability Index of Fish Species in the Gapyeong stream |
| Authors |
공동수 ( Dongsoo Kong ) ; 손세환 ( Se-hwan Son ) ; 김진영 ( Jin-young Kim ) ; 김필재 ( Piljae Kim ) ; 권용주 ( Yongju Kwon ) ; 김정우 ( Jungwoo Kim ) ; 김예지 ( Ye Ji Kim ) ; 민정기 ( Jeong Ki Min ) ; 김아름 ( Ah Reum Kim ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.33.6.626 |
| Keywords |
Environmental flow; Fish; Gapyeong stream; Habitat Suitability Index |
| Abstract |
Based on an ecological monitoring in a Korean stream (Gapyeong), Habitat Suitability Index (HSI) of nine fish species was developed for three physical habitat factors : current velocity, water depth and substrate. The species were chosen based on their abundance and frequency in the fish community of the Gapyeong stream. The Weibull model was used as the probability density function to analyze the distribution and number of each fish species according to the three identified physical factors, which showed good results. This HSI equation has advantages because it statistically expresses habitat preferences of fish species simply and clearly. From that, we can quantitatively deduce the central tendency and variation of environmental factors for fish distribution. The selected fish species showed different preferences for each habitat factor respectively. Although there are some exceptions, the distribution and abundance of individual species of nektonic fish (Zacco koreanus, Zacco platypus, Microphysogobio longidorsalis and Pungtungia herzi) were positively skewed to deep water and fine substrate while riffle-benthic fish (Koreocobitis rotundicaudata and Coreoleuciscus splendidus) were normally distributed at the shallow and coarse substrate zone. It seems that the species showing the positively skewed distribution to the current, Z. koreanus, Z. platypus, M. longidorsalis and P. herzi have adapted themselves to the fast current and have expanded their niche. |