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포식압력 하에 치어 보호 구조물이 피식자의 생존율에 미치는 영향에 관한 실험적 연구
안창혁 ( Chang Hyuk Ahn ),주진철 ( Jin Chul Joo ),이새로미 ( Sae Ro Mi Lee ),안호상 ( Ho Sang Ahn ),박재로 ( Jae Roh Park ),송호면 ( Ho Myeon Song ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.6
The aim of this study was to evaluate artificial fish shelter, which was known to increase prey survival and ex[and 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 (Period 1~2) 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 Period 1 (25.6 ± 2.0℃), affected the predation activity of piscivorous fishes, Coreoperca herzi (C. herzi, size 89 ± 4 mm). Survival rates of the prey fishes, Rhynchocypris oxycephalus (R. oxycephalus, size 29±1 mm), improved as the patch volume increased and were higher than those of the control group by 35.0 ~ 46.7%. Analysis showed that JFS reduced the chances of predator-prey encounter, and thereby minimized prey vulnerability.
얕은 연못에서 수위변동에 따른 담수 어류 피난처 확보를 위한 실험적 접근
안창혁(Chang Hyuk Ahn),주진철(Jin Chul Joo),이새로미(Saeromi Lee),오주현(Ju Hyon Oh),안호상(Ho Sang Ahn),송호면(Ho Myeon Song) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.9
담수생태계에서 갈수기가 지속되면 다양한 물리적 장애가 발생한다. 이 시기는 어류의 생태 유지용수가 부족하여, 이동이 일어남에 따라 새로운 피난처 및 서식처가 요구된다. 이러한 문제를 해결하기 위해 본 연구에서는 실증규모의 실험시설을 구축하였으며, 수위변화와 어류 피난처의 관계를 분석하였다. ADP (artificial deep pool)는 본 연구에서 제안된 인공적인 깊은 웅덩이이다. 본 시설을 실증규모의 test-bed 실험구에 적용하여 모니터링 한 결과, 수위변화에 따른 어류 개체수는 실험연못의 수심 0.5 m에서 가장 높게 나타났다. 하지만 ADP에서는 낮은 외부 수위 조건(<0.3 m)에서 단위면적당 어류개체수가 증가하였고, 실험구의 총 어류 군집을 보존하는데 기여하였다. 또한, ADP 내부의 수온과 DO는 외부보다 낮게 조성되었지만, 어류는 지속적으로 서식하였다. 이 결과와 관련하여, ADP 내부는 WCS, OS, SS, TS 등이 높은 효율적인 정수생태계임을 나타내었다. 더욱이, ADP 내부의 종풍부도는 Acheilognathus koreensis (A. koreensis), Carassius carassius (C. carassius)와 같은 WCS가 높은 비율로 측정되었다. 결국, 수위가 낮게 형성되는 동안 어류는 서식환경의 교란에 의해 수심이 깊은 곳으로 피난하였고, 본 연구 결과를 종합하여 볼 때, ADP는 정수생태계에 적합한 어류 피난 및 서식처로 활용이 가능함을 시사하였다. Physical disturbance, which induces a lack of flow rate, frequently occurs in freshwater ecosystem. Due to this, it is required to provide a new fish shelter to resolve. We installed a pilot scale test-bed to scrutinize the relationship between water level and the influence of fish shelter. The proposed ADP (artificial deep pool) is a fish shelter which composed of concrete materials. From the monitoring results in test-bed, it was observed that the population of fish was the highest at the 0.5 m in depth from the water level of experimental pond. But it was more appropriate for shallow water level (<0.3 m) to conserve the total number of fish by increasing the number per unit area despite of lower inner temperature and DO than outer environment. Therefore, inner of ADP was more efficient lentic system for fish to live due to higher WCS, OS, SS, and TS. In addition, there was a relative abundance of WCS fish species such as Acheilognathus koreensis (A. koreensis), Carassius carassius (C. carassius). Considered these results, it is suggested that ADP is appropriate to use for fish shelter and habitat for the fishes in lentic ecosystem.
도시 소하천에서 유속, 비표면적에 따른 사상형 부착조류의 Chlorophyll-a 변화
안창혁 ( Chang Hyuk Ahn ),주진철 ( Jin Chul Joo ),이새로미 ( Sae Ro Mi Lee ),오주현 ( Ju Hyun Oh ),안호상 ( Ho Sang Ahn ),송호면 ( Ho Myeon Song ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.4
The feasibility of water supply as in-stream flow for Mangwall stream was analyzed in terms of water quality and cultivation periphyton using two different types of water resources (e.g., surface water and bank filtration from Han River basin) and three different types of media (e.g., tile, concrete and pebble). The concentrations of organic and inorganic contaminants from the bank filtration were lower than those from surface water by 17.5 ~ 55.0%. Using water samples collected from Mangwall stream, surface water, and bank filtration, chlorophyll-a, phaeopigment, and growth rate of periphyton were investigated. During 30 day incubation for each water sample, it was observed that filamentous cyanobacteria, Oscillatoriaceae, accounted for 98%, and water velocity of 5 cm/s was optimum for the in situ filamentous cyanobacteria growth. Also, it was deducted for water velocity and chl-a to have an inverse correlation. Meanwhile, the greater the specific surface area of media, the higher the concentration of chl-a. From these results, both water velocity and specific surface area of media should be considered as an combined parameter to deter the growth of filamentous cyanobacteria.