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Aquatic Ecological Health and Characteristics of Chironomids Outflow Accidents in Tap Water
Ihn-Sil Kwak(곽인실) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
In 2020, the chironomids larvae spill from activated carbon at a water purification plant occurred. The Chironomus(Diptera: Chironomidae) is a freshwater benthic invertebrate that is an dominant organism used for environmental pollution and water quality monitoring. In this study, we performed morphological classification and genetic species identification using the cytochrome c oxidase subunit I (COI) gene on mitochondrial DNA for an accurate species classification of Chironomus larvae found in tap water purification plants in species, including twelve Chironomus kiiensis, six Chironomus flaviplumus, one Chironomus dorsalis, and one Polypedilum yongsanensis (not included Genus Chironomus) in Incheon. mentum, the mandible, the antenna, and the claw. Based on the COI sequences of 21 individuals of 17 Chironomus species registered in NCBI Genbank, phylogenetic analysis indicated that the 20 individuals investigated in this study consist of the same clade with corresponding species of the high homology (99~100%) including C. kiiensis, C. flaviplumus, C. dorsalis, and P. yongsanensis. These results will be used as main classification indicator for monitoring freshwater ecosystems by providing integrated morphological and genetic information for the species identification of Korean Chironomus.
자연적인 기온과 강수량 증가로 인한 저서성 대형무척추동물 군집 구성의 변화
홍철,김원석,곽인실,Hong, Cheol,Kim, Won-Seok,Kwak, Ihn-Sil 한국하천호수학회 2017 생태와 환경 Vol.50 No.3
기온과 강수량의 변화에 따른 저서성 대형무척추동물 우점종의 변화를 알아보기 위하여, 섬진강 본류 20지점을 대상으로 2013년과 2014년 5월과 9월 년 2회씩 총 4회에 걸쳐 조사하였다. 서식환경에 중요한 요인으로 작용하는 기온, 강수량, 수질요인과 하상 구성을 수집하고 측정하였다. 섬진강의 평균기온은 2013년에 비해 2014년 $0.2^{\circ}C$증가하였고, 상류에서 하류로 갈수록 기온이 증가하는 양상이 뚜렷하여 $3^{\circ}C$ 이상의 차이를 보였다. 또한 연 누적강수량 (ACP)도 저위도로 갈수록 증가되었다. 섬진강은 강우 전 5월 ($7.6{\sim}11.3^{\circ}C$)에 비하여 강우 후 9월($21.7{\sim}24.5^{\circ}C$)에 기온이 2배 이상 높아지며, CP는 강우 전(263 mm~287.5 mm)과 강우 후(756.3 mm~882 mm)에 약 3배 증가하는 것으로 나타났다. 여름철 집중 강우로 인한 유실효과로, 개체수와 종 수는 5월이 9월보다 높았다. 5월은 깔따구류와 세갈래하루살이, 9월은 네점하루살이, 큰줄날도래, 세갈래하루살이가 우점을 차지하였다. 생물지수와 환경요인 간의 상관성 분석 결과, 하상 구성 중 호박돌 및 모래와 높은 상관성이 있는 것으로 나타났다. 섬진강의 기온과 CP, 우점종 출현과의 집괴분석한 결과 강수량과 기온에 따라 2그룹으로 크게 나뉘었으며, 우점종과 지리적인 위치가 반영되어 세부적인 그룹으로 나뉘어짐을 파악하였다. To investigate the changes of dominant species of benthic macroinvertebrates according to the changes of temperature and precipitation, we surveyed twenty sites of the main Seomjin River in May and September in 2013 and 2014. The temperature, precipitation, water quality factors and substrate composition, which are important factors in benthos habitat environment, were collected and measured. The average temperature of the Seomjin River increased by $0.2^{\circ}C$ in 2014 compared to 2013, and the temperature increased from upstream to downstream, showing a difference of more than $3^{\circ}C$. Also, the annual cumulative precipitation (ACP) was increased toward low latitude. The temperature of Seomjin River increased more than twice in September ($21.7{\sim}24.5^{\circ}C$) after rainfall compared to May ($7.6{\sim}11.3^{\circ}C$) before rainfall, and CP (cumulative precipitation) increased about 3 times before rainfall (263 mm~287.5 mm) and after rainfall (756.3 mm~882 mm). Due to washing effect by summer precipitation, total number of species and individuals for benthic macroinvertebrates were higher in May than in September. Chironomidae sp. and Choroterpes altioculus were dominated in May, Ecdyonurus levis, Macrostemum radiatum and Choroterpes altioculus were dominated in September. As a result of correlation analysis between community indices and environment factors, it was found that there is a high correlation with boulder and sand among substrate compositions. According to the results of cluster analysis based on temperature, CP and the dominant species of benthic macroinvertebrates in Seomjin River, it was divided into two groups following temperature and CP, and the dominant species and geographical position were reflected and divided into detailed groups.
국내 담수어류 45종의 먹이원 분석(문헌자료 분석을 중심으로)
지창우,이대성,이다영,곽인실,박영석,Ji, Chang Woo,Lee, Dae-Seong,Lee, Da-Yeong,Kwak, Ihn-Sil,Park, Young-Seuk 한국하천호수학회 2020 생태와 환경 Vol.53 No.4
We analyzed food sources of 45 fish species in 28 genera of 12 families based on literature data in freshwater ecosystems of South Korea. The food sources of 45 fish species included in a total of 26 phyla, 42 classes, 94 orders, 189 families and 294 genera. Among them, animal food sources were 16 phyla, 24 classes, 54 orders, 126 families and 212 genera, whereas plant food sources were relatively small with 10 phyla, 18 classes, 42 orders, 63 families and 82 genera. The animal food sources were classified into Arthropod, Insecta, Diptera and Chironomidae according to taxa. Meanwhile, Bacillariophyta, Bacillariophyceae, Cymbellales and Cymbellaceae were the most abundant among the plant sources. Self-Organized Map (SOM) and network analysis were conducted the food sources were classified into taxonomic groups and the feeding types of fish : 45 fish species were divided into five groups, characterizing 1) fishvores, 2) invertebratevores, planktivores including 3) zooplankton and 4) phytoplankton, and 5) omnivores. The network analysis presented link association between fishes and food sources. Macroinvertebrate including diptera and ephemeroptera were revealed as hub food sources based on network analysis. This literature study would expect that the application model with the food source of fish could be utilized for the evaluation of the food network or chain in freshwater ecosystems. 국내 담수 어류 12과, 28속, 45종의 먹이원을 문헌 조사한 결과, 동물류 먹이원은 16문, 24강, 54목, 126과, 212속으로 조사되었으며 식물류 먹이원은 10문, 18강, 42목, 63과, 82속으로 나타났다. 동물류 먹이원 중 가장 많은 어류가 섭식한 먹이원은 분류군에 따라 절지동물문, 곤충강, 파리목, 깔따구과로 조사되었으며, 식물류 먹이원은 돌말문, 윷돌말강, 반달돌말목, 반달돌말과로 조사되었다. SOM을 이용하여 45종 어류의 유형화 결과, 어류를 주로 포식하는 어류와 저서무척추동물을 포식하는 어류, 동물플랑크톤을 섭식하는 어류, 식물플랑크톤을 섭식하는 어류, 잡식성 어류 5가지 유형으로 나타났다. 네트워크 분석의 허브 점수가 높은 상위 5종의 어류는 블루길, 몰개, 수수미꾸리, 남방종개, 새코미꾸리 순으로 나타났으며 먹이원 중 허브 점수가 높은 상위 5 종류의 먹이원은 파리목, 하루살이목, 이지목, 김발돌말목, 쪽배돌말목 순으로 조사되었다.
초음파 진동 테이블이 질화알루미늄 세라믹의 ELID 연삭 가공에 미치는 영향
곽태수(Tea-Soo Kwak),정명원(Myung-won Jung),김건희(Geon-Hee Kim),곽인실(Ihn-Sil Kwak) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.12
This study has focused on the effect of ultrasonic vibration table in ELID grinding process of aluminum nitride ceramics. Aluminum nitride ceramics has superior physical and chemical properties and widely used in IC, LSI substrate, package and so on. To achieve the high effective machining of brittle and high strength ceramics as like aluminum nitride, machining method combined ELID grinding and ultrasonic vibration has been adopted in this study. From the experimental results, material removal rate, MRR has been increased maximum 36 percent and spindle resistance has been decreased in using ultrasonic table. Surface roughness of ground surface became a little worse in using ultrasonic table but was somewhat improved in feed direction.