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공검지 고퇴적물(paleo-sediments)에서 남조류 휴면포자 출현 및 형태 분석에 관한 연구
권대률,박채홍,김건희,조현진,이진영,이호일,이상득 한국조류학회I 2023 수생생물 Vol.3 No.1
The purpose of this study was to investigate the distribution of akinete of Nostocales cyanobacteria in sediments in Gonggeom-ji expected to be lakes and wetlands, and to identify past ancient environments through chronological analysis results and akinete ecological features. The investigation target sites were conducted at 3 sites in the Gonggeom-ji area located in Sangju, and drilling was used to collect sedimentary soil. In order to analyze the formation period of the sedimentary layer, a chronological analysis was conducted, and the appearance, separation, and morphological characteristics of cyanobacteria akinete were conducted at intervals of 10cm. Two types of akinete were observed through a microscope, type 1 showed similar results to the length and width of akinete of the Dolichospermum genus mentioned in previous studies, and type 2 showed similar shapes to the length and width of akinete of the Aphanizomenon genus mentioned in previous studies. Therefore, the two types of akinetes from this study could be inferred as akinetes of the Dolichospermum and Aphanizomenon genus. Akinetes of type 1 were observed at St. 1 and 2, while akinetes of type 2 were observed at St. 2 and 3. The era of akinetes appeared in various sections from the 1,800 s to the 1,500 s BC. Cyanobacteria akinetes can be used as fossil indicators, and through these studies, valuable records of past environmental changes in the survey area can be obtained, and paleontological data can be used to interpret environmental changes in the lake. 본 연구는 호소 및 습지로 예상되는 공검지 지역 내 고퇴적물에서 염주말목(Nostocales) 남조류의 휴면포자(akinete)의 분포 및 남조류 발생 기록을 설명하고 연대분석 결과와 휴면포자 생태적 특징을 통하여 과거 고환경에 대해 파악하고자 하였다. 조사 대상 지점은 상주에 위치한 공검지 일대 3개 지점에서 진행하였으며 퇴적토를 채취하기 위하여 시추를 시용하였다. 퇴적층의 형성시기를 분석하기 위하여 연대분석을 진행하였으며, 채집된 샘플을 대상으로 10cm 간격으로 남조류 휴면포자의 출현 유무와 분리 및 형태적 특징 분석을 진행하였다. 현미경을 통해 관찰된 남조류 휴면포자는 두가지 형태가 관찰되었으며, type 1은 Dolichospermum (=Anabaena) 속의 휴면포자의 폭 및 너비와 비슷한 결과를 보였으며, type 2는 Aphanizomenon 속의 휴면포자의 형태와 유사한 특징을 나타냈다. 따라서, 본 연구에서 나온 2개의 휴면포자는 Dolichospermum 속과 Aphanizomenon 속의 휴면포자로 유추할 수 있었으며, type 1의 휴면포자는 St. 1, 2 지점에서 관찰이 된 반면, St. 2, 3에서는 type 2의 휴면포자가 관찰되어 지점 특이적인 분포양상을 보였다. 휴면포자가 출현한 연대는 기원전 1,800년대에서 1,500년대까지 다양한 구간에서 출현하였다. 남조류 휴면포자는 화석지표로 활용할 수 있으며 이러한 연구를 통하여 조사 지역의 과거 환경변화에 대한 귀중한 기록을 획득할 수 있으며 고생물 데이터를 통해 호수의 고환경변화에 대한 해석에 유용하게 이용될 수 있을 것이다
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권대률,남현주,조복연,남승원 국립생물자원관 2022 Journal of species research Vol.11 No.2
The Ulvophyceae are a diverse group and most species are distributed in marine environments, however, a smaller diversity occurs in freshwater and terrestrial habitats. Also, the diversity of species belonging to Ulvophyceae has been superficially investigated in Korea. Here, we identify two freshwater ulvophycean species based on the morphology, ultrastructural observation, and phylogenetic analysis. As a result, their taxonomic classifications are as follows: order Ulvales Blackman and Tansley, 1902 - family Kornmanniaceae Golden and Cole, 1986 - Lithotrichon pulchrum Darienko and Pröschold 2017; order Ulotrichales Borzì, 1895 - family Tupiellaceae Škaloud and Leliaert, 2018 - Tupiella speciosa Darienko and Pröschold 2017. The family Tupiellaceae and the two genera Lithotrichon and Tupiella are reported for the first time in Korea.
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New recorded diatoms in Holocene sediment cores from the Gonggeom-ji Wetland in Korea
권대률,박미례,이호일,Jin-Young Lee,이상득 한국현미경학회 2023 Applied microscopy Vol.53 No.1
The Gonggeom-ji reservoir is an agricultural one built for rice farming during the Proto-Three Kingdoms period and was designated as Gyeongsangbuk-do monument No. 121 because of its high historical value. The Nakdonggang National Institute of Biological Resources has been conducting paleontological and paleoenvironmental studies on major wetlands from Korea since 2016, as well as diatom, geological, and depth distribution analyses on the sedimentary soil of Gonggeom-ji. This study summarized the description and ecological characteristics of six newly recorded diatoms ( Gomphonema lacusrankala, Pinnularia diandae, P. gibba var. hyaline, P. lacunarum, Sellaphora labda var. nipponica, Stauroneis angustilancea ) found in samples collected through drilling in Gonggeom-ji in 2019.
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Environmental factors affecting akinete germination and resting cell awakening of two cyanobacteria
권대률,김건희,Hyunjin Jo,이상득,윤석민,Chaehong Park 한국현미경학회 2023 Applied microscopy Vol.53 No.1
Globally, cyanobacteria frequently cause blooms that outcompete other species in the waterbody, affecting the diversity, decreasing water exchange rates, and promoting eutrophication that leads to excessive algal growth. Here, Dolichospermum circinale (akinetes) and Microcystic aeruginosa (resting cells), were isolated from the sediment in the Uiam Dam in the North Han River and near Ugok Bridge in the Nakdong River, respectively. The morphology, germination process and rates, and growth was evaluated in different environmental conditions. D. cercinalis germination began on day two of culturing, with maximum cell growth observed on day ten. In contrast, M. aeruginosa exhibited daily increase in cell density and colony size, with notable density increase on day six. Next, different environmental conditions were assessed. Akinetes exhibited high germination rates at low light intensity (5—30 µmol/m 2 /s), whereas resting cells exhibited high growth rates at high light intensity (50—100 µmol/m 2 /s). Furthermore, both cell types exhibited optimum germination and growth in media containing N and P at 20—30° at a pH of 7—9. Our study reveals the optimum conditions for the germination and growth of cyanobacterial akinetes and resting cells isolated from river sediment, respectively, and will assist in predicting cyanobacterial blooms for appropriate management.
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