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        검색결과 8

        1.
        2023.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Small ponds, which exhibit unstable succession pattern of plankton community, are less well studied than large lakes. Recently, the importance of small ponds for local biodiversity conservation has highlighted the necessity of understanding the dynamics of biological community. In the present study, we collected zooplankton from three small reservoirs with monthly basis and analyzed their seasonal dynamics. To understand the complicated zooplankton community dynamics of small reservoirs, we categorized zooplankton species into four groups (LALF Group, Low Abundance Low Frequency; LAHF Group, Low Abundance High Frequency; HALF Group, High Abundance Low Frequency; HAHF Group, High Abundance High Frequency) based on their occurrence pattern (abundance and frequency). We compared the seasonal pattern of each group, and estimated community diversity based on temporal beta diversity contribution of each group. The result revealed that there is a relationship between groups with the same abundance but different occurrence frequencies, and copepod nauplii are common important component for both abundance and frequency. On the other hand, species included with LALF Group throughout the study period are key in terms of monthly succession and diversity. LALF Group includes Anuraeopsis fissa, Hexarthra mira and Lecane luna. However, groups containing species that only occur at certain times of the year and dominate the waterbody, HALF Group, hindered to temporal diversity. The results of this study suggest that the species-specific occurrence pattern is one key trait of species determining its contribution to total annual biodiversity of given community.
        4,800원
        2.
        2023.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The medium-large cladoceran species Simocephalus spp. predominantly occur in habitats with developed aquatic vegetation. Accordingly, due to Simocephalus’ high contribution to zooplankton community biomass in the lake’s littoral zone and wetland habitats, estimating their biomass is important to understand the matter cycling based on biological interactions within the aquatic food web. In this study, we reviewed the length-weight regression equations used previously to estimate Simocephalus biomass, directly measured S. serrulatus’ body specification (length, width and area) and their biomass (dry weight) using instruments such as a microscopic digital camera and a microscale, and performed regression analysis between each other. When S. serrulatus biomass was estimated using the equation (Kawabata and Urabe, 1998) presented in 『Biomonitoring Survey and Assessment Manual』, Korea, errors between estimates and measures were relatively large compared to the S. serrulatus species-specific biomass estimate equation developed by Lemke and Benke (2003). In addition, both equations showed not only increasing trends in error (estimate-measure) with increasing S. serrulatus’ body length, but also in error variance among similar-sized individuals. The results of regression analysis with dry weight by body specifications indicated that the most appropriate equation for estimating the biomass of S. serrulatus was derived from the width-dry weight exponential regression equation (R2=0.9555). The review and development study of such species-specific biomass estimation equations for zooplankton can be used as a tool to understand their role and function in aquatic ecosystem food webs.
        4,200원
        3.
        2023.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Recently, Korean government has introduced Multi Metric Indices (MMI) using various biocommunity information for aquatic ecosystem monitoring and ecosystem health assessment at the national level. MMI is a key tool in national ecosystem health assessment programs. The MMI consists of indices that respond to different target environmental factors, including environmental disturbance (e.g. nutrients, hydrological and hydraulic situation of site etc.). We used zooplankton community information collected from Korean lakes to estimate the availability of candidate zooplankton MMI indices that can be used to assess lake ecosystem health. First, we modified the candidate indices proposed by the U.S. EPA to suit Korean conditions. The modified indices were subjected to individual index suitability analysis, correlation analysis with environmental variables, and redundancy analysis among indices, and 19 indices were finally selected. Taxonomic diversity was suggested to be an important indicator for all three taxonomic groups (cladoceran, copepod, rotifer), on the other hand, the indices using biomass for large cladocerans and copepods, while the indices using abundance were suggested for small cladocerans and rotifers.
        4,500원
        4.
        2022.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Through sample-size-based rarefaction analyses, we tried to suggest the appropriate degree of sample concentration and sub-sample extraction, as a way to estimate more accurate zooplankton species diversity when assessing biodiversity. When we collected zooplankton from three reservoirs with different environmental characteristics, the estimated species richness (S) and Shannon’s Hʹ values showed different changing patterns according to the amount of sub-sample extracted from the whole sample by reservoir. However, consequently, their zooplankton diversity indices were estimated the highest values when analyzed by extracting the largest amount of sub-sample. As a result of rarefaction analysis about sample coverage, in the case of deep eutrophic reservoir (Juam) with high zooplankton species and individual numbers, it was analyzed that 99.8% of the whole samples were represented by only 1 mL of sub-sample based on 100 mL of concentrated samples. On the other hand, in Soyang reservoir, which showed very small species and individual numbers, a relatively low representation at 97% when 10 mL of sub-sample was extracted from the same amount of concentrated sample. As such, the representation of sub-sample for the whole zooplankton sample varies depending on the individual density in the sample collected from the field. If the degree of concentration of samples and the amount of subsample extraction are adjusted according to the collected individual density, it is believed that errors that occur when comparing the number of species and diversity indices among different water bodies can be minimized.
        4,200원
        5.
        2021.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        동물플랑크톤 군집 연구에 DNA 바코딩과 같은 DNA 분 석 기법의 적용은 분류형태학을 기반으로 하는 전통적인 종 동정 시 발생할 수 있는 문제 (e.g. 개체의 표현형 가소성에 의한 오동정, 유사종 및 자매종, 유생 시기의 종 동정의 어려움)를 보완할 수 있다. 최근 DNA 시퀀싱 기술의 발전으로 다양한 수생태계의 동물플랑크톤 군집은 물론, 육안 및 현미경을 통해 구분하는 데 한계가 있는 동물플랑크톤의 위 내용물에 대한 DNA 기반 군집 분석 또한 가능하게 되었으며, 이는 동물플랑크톤의 섭식 먹이원 분석을 통한 생물학적 상호 작용을 이해를 돕는다. 본 논문은 동물플랑크톤 연구에 DNA 분석 기법이 활용된 사례 (e.g. DNA 바코딩을 이용한 계통분 류학적 연구, 메타바코딩을 이용한 군집 분석, 위 내용물 분석)를 소개하고 분석 방법을 요약하여, 최종적으로 향후 이를 활용하고자 하는 연구자들에게 연구 접근성을 높일 수 있도록 방법론적인 기초 지식을 제공하고자 하였다.
        4,600원
        6.
        2018.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Two sewage treatment facilities were selected to identify odor emission characteristics, focusing on volatile organic compounds (VOCs) and sulfur compounds. The complex odor, 5 kinds of sulfur compounds and 23 kinds of VOCs were analyzed from gas and sludge storages. Hydrogen sulfide was detected in the highest concentration and had the highest odor quotient among the odorous compounds monitored in this study, demonstrating that the contribution of hydrogen sulfide to the complex odor reached up to 90%. For VOCs, the overall contribution to the complex odor was not critical but VOCs can sufficiently trigger an odorous sensation because the sum of the odor quotient reached up to 2.89.
        4,000원
        7.
        2019.06 KCI 등재 서비스 종료(열람 제한)
        목적: 본 연구는 국내 문화권 내에서 심미적 종목 선수들이 인지하는 경기력에 대한 개념 구조를 탐색하고자 하 는 것에 그 목적이 있다. 방법: 연구의 목적을 달성하기 위하여 대한체육회 산하 대한체조협회와 대한빙상연맹에 소속된 심미적 종목(리듬체조·피겨스케이팅) 선수 83명을 대상으로 조사하였다. 반 구조화된 개방형 질문을 통하 여 총 715개의 원 자료를 수집하였으며, 이후 수집된 원 자료는 한글 프로그램을 이용하여 전사한 후 질문의 내 용을 토대로 전문가 집단의 반복회의를 통하여 귀납적 내용분석을 실시하였다. 이를 통하여 원 자료, 세부영역, 일반영역으로 분류하는 과정을 거쳤으며, SPSS 18.0 Version Program을 이용하여 빈도분석(Frequency analysis)을 수행하였다. 결과/결론: 그 결과 경기력에 대한 심리적 표상 106개, 신체 상태에 대한 표상 248개, 심리 상태에 대한 표상 167개, 환경적 상태에 대한 표상 194개로 총 715개의 원 자료 중 13개의 일반영역과 28개의 세부영역 으로 심미적 종목 선수들의 인지된 경기력이 개념화 되었다. 이후 분류된 영역을 바탕으로 결과에 대하여 심미적 종목 본질에 중점을 둔 기존 연구와 비교하며 논의하였다.
        8.
        2016.11 KCI 등재 서비스 종료(열람 제한)
        Purpose: Because of the limited number of athletes, the drop-out rate of young gymnasts imposes significant threat to Korean gymnastics which have been quite successful at the international level. To avoid discontinuances in athletes’ carriers and to maintain such successes, this study aimed to identify the factors influencing the level of adherence. Especially, in addition to the the previously reported effects of gymnasts’ ego-resilience on exercise adherence, the mediating effect of self-management was tested. Methods: One hundred twenty six gymnasts were collected with purposive/non-probability sampling who register in Korean Olympic Committee (KOC). Frequency analysis, descriptive statistical analysis, confirmatory factor analysis, reliability analysis, correlation analysis, structure equation modeling analysis were performed with SPSS 18.0, AMOS 18.0 and Excel 2010 programs, and significance of mediated effect was verified with bootstrapping. Results: The ego-resilience of gymnasts has positive relation with exercise adherence, and self-management fully mediates the relation between ego-resilience and exercise adherence.