포식압력 하에 치어 보호 구조물이 피식자의 생존율에 미치는 영향에 관한 실험적 연구

Experimental Study on Effect on Prey Survival by Juvenile Fish Shelter (JFS) under Pressure by Piscivorous Fishes

  • 안창혁 (한국건설기술연구원 환경연구실) ;
  • 주진철 (한국건설기술연구원 환경연구실) ;
  • 이새로미 (한국건설기술연구원 환경연구실) ;
  • 안호상 (한국건설기술연구원 환경연구실) ;
  • 박재로 (한국건설기술연구원 환경연구실) ;
  • 송호면 (한국건설기술연구원 환경연구실)
  • Ahn, Chang Hyuk (Environmental Engineering Research Division, Korea Institute of Construction Technology) ;
  • Joo, Jin Chul (Environmental Engineering Research Division, Korea Institute of Construction Technology) ;
  • Lee, Saeromi (Environmental Engineering Research Division, Korea Institute of Construction Technology) ;
  • Ahn, Hosang (Environmental Engineering Research Division, Korea Institute of Construction Technology) ;
  • Park, Jae-Roh (Environmental Engineering Research Division, Korea Institute of Construction Technology) ;
  • Song, Ho Myeon (Environmental Engineering Research Division, Korea Institute of Construction Technology)
  • 투고 : 2013.08.29
  • 심사 : 2013.10.28
  • 발행 : 2013.11.30

초록

The aim of this study was to evaluate artificial fish shelter, which was known to increase prey survival and expand habitat space to improve species diversity and fish communities in a freshwater ecosystem. The experiment was performed at an outdoor test-bed for three months from 2011 by comparing the responses to adjustments in the volume of the artificial patch (juvenile fish shelter, JFS) in the control and experimental groups. Analysis of the environmental conditions over two periods (Period1 ~ 2) showed minor differences in the physichemical characteristics of water quality, phytoplankton, and zooplankton biomass, thus, allowing comparative analysis of feeding ecology. However, high water temperature conditions in Period1 ($25.6{\pm}2.0^{\circ}C$), affected the predation activity of the piscivorous fishes, Coreoperca herzi (C. herzi, size $89{\pm}4mm$). Survival rates of the prey fishes, Rhynchocypris oxycephalus (R. oxycephalus, size $29{\pm}1mm$), improved as the patch volume increased and were higher than those of the control group by 35.9 ~ 46.7%. Analysis showed that JFS reduced the chances of predator-prey encounter, and thereby minimized prey vulnerability.

키워드

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