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멸종위기 야생생물 I급 여울마자 서식지 환경 특성 파악을 통한 훼손 원인 분석
윤주덕,김근식,박창득,강동원,이흥헌,임치홍,김남신 한국하천호수학회 2023 생태와 환경 Vol.56 No.3
Microphysogobio rapidus is designated as endangered species class I by Ministry of Environment, and its distribution and population have been gradually declining, and it is now limited to the Nam River and some tributary streams of the Nakdong River Watershed. For the restoration of this highly endangered species, it is important to identify the causes of the decline and establish appropriate restoration plans. However, due to lack of basic data and ecological research, most steps are stagnant. Therefore, in this study, we identified the differences in the physical, biological, and sociological habitats between current and past distributed sites through field surveys and literature reviews. As a result of the field survey, there were differences in conductivity between the current and past distributed sites, and fish communities were also showed differences. The literature data also showed that the physico-chemical values of the past distributed sites were generally unfavorable, which generated negative consequences on biological factors. In particular, the effects of urbanization were found to be a major factor affecting the habitat of M. rapidus. Habitat stabilization is crucial for the recovery of this endangered species. However, in the past distributed sites, disturbances such as stream development and weir construction have altered streams physico-chemically and result in changes of M. rapidus. Therefore, a comprehensive plan that considers both stream connectivity and water quality is needed to manage and restore the habitat of M. rapidus.
금강하류의 어류상 및 안정동위원소 분석을 이용한 섭식길드 파악
윤주덕,박상현,장광현,최종윤,주기재,남귀숙,윤조희,장민호 한국환경생물학회 2015 환경생물 : 환경생물학회지 Vol.33 No.1
Fish fauna, difference of stable isotope ratio between freshwater and seawater, andtrophic guilds of freshwater fishes were investigated in the lower Geum River. The study was conductedin 2011, and total study area was about 30 km of 20 km upstream and 10 km downstreamfrom the Geum River estuary barrage. Only freshwater fishes were used for analyzing trophicguilds, and discriminant function analysis (DFA) was utilized to reclassify trophic guilds based onstable isotope ratio. Fish fauna in freshwater and seawater areas were entirely different each other,but small number of migratory species such as Coilia nasus and Chelon haematocheilus occurredboth areas. Other species were not collected in the different areas because they did not have physiologicalability to adapt different salinity concentrations. Stable isotope ration of two areas weredifferent considerably due to food sources. Estuary and seawater fishes uptake food sources originatedfrom marine, and freshwater fishes were from freshwater and terrestrial. Some migratoryspecies showed reverse stable isotope ratio. Even though they collected in freshwater, they showedstable isotope ratio of seawater. This is because ecological characteristics of each species. Trophicguilds of freshwater fishes were reclassified by DFA, and showed slight difference with literatures.However, because this result is related with ontogenetic shift of species, more studies are needed toexplain exact and correct trophic guilds. Stable isotope ratio can be changed among regions, seasonsand ontogenetic stage, thus we always consider these aspects when analyzing results to get a rightanswer.
윤주덕,김정희,박상현,김이브,장민호 한국해양과학기술원 2017 Ocean science journal Vol.52 No.1
The construction of an estuary barrage, an instream structure in the lower reaches of a river, causes significant physical changes in water flow patterns and river morphology, and results in altered environmental conditions. Here, we examined the impact of the Geum River estuary barrage, completed in 1990, on fish assemblages by using a literature search and fresh surveys of fishways in the barrage. We found that fish assemblages upstream and downstream of the barrage were altered following its completion. After construction, more species were found in the freshwater area, with a particularly great increase in freshwater species. Conversely, estuarine and marine species were only consistently caught in the downstream salt-water area, although the number of species increased. In total, 15,829 fish from 47 species and 20 families were identified at the three types (pool and weir, rubble type, and boat passage) of fishways in the barrage. The dominant species were Chelon haematocheilus, an estuarine species, Coilia nasus, a diadromous species, and Erythroculter erythropterus, a freshwater species. The mean total length of fish (101.9 ± 76.0 mm) in the boat passage fishway was approximately 100 mm lesser than those in the pool and weir (207.2 ± 112.8 mm) and rubble type (205.8 ± 112.7 mm) fishways. The boat passage fishway was the most efficient for fish movements. The current fishway system is not sufficient for fish migration, and thus additional ways are required to improve the system such as the boat passage. Few estuarine or diadromous species were found in both freshwater and salt-water areas, but freshwater fishes that accidently moved to salt-water area actively used fishways. Therefore, fishway management in the Geum River estuary barrage has to focus on freshwater fish; however, this may need to change to a focus on migratory fishes depending on ecological life cycles of migratory fish.