Research

RYUJI’s research deals with aquatic microbial ecology. He focuses on anaerobic microbes such as sulphate-reducing bacteria, phototrophic sulphur bacteria and heterotrophic/bacterivorous protists with reference to carbon and sulphur cycling in marine and lacustrine environments.

Main fields

Wakasa Bay extends from Cape Kyoga to Cape Echizen along the Japan Sea coast of Honshu Island, Japan. The Mikata Lake Group is located in the central part of the coast of Walasa Bay in Fukui Prefecture. The Mikata Lake Group consists of five lakes; Lake Mikata, Lake Suigetsu, Lake Suga (Suga basin), Lake Kugushi and Lake Hiruga. RYUJI makes better use of the meromictic Lake Suigetsu and the saline Lake Hiruga for researches in ecology and physiology of anaerobic microorganisms such as sulphate-reducing and sulphur-oxidising bacteria and anaerobic bacterivorous nano-sized protists as well.

Lake Suigetsu

Lake Suigetsu is a typical meromictic lake, characterised by a permanent oxycline at a depth between 3 and 8 m separating the aerobic freshwater epilimnion from the anaerobic, saline (ca. 14psu), sulphidogenic hypolimnion. Seawater from the Japan Sea penetrates Lake Suigetsu through Lakes Hiruga and Kugushi adjacent to Lake Suigetsu only at high tides during the autumn and winter. Meromixis of Lake Suigetsu results from the entry of two different waters, freshwater through Lake Mikata and saltwater through Lakes Hiruga and Kugushi. Thus, the deeper layers of Lake Suigetsu stagnate. With prolonged meromixis, anoxic bottom water attains high levels of toxic inorganic compounds, including sulphides and ammonia. Lake Suigetsu has attracted interest concerning bacterial sulphate reduction and sulphur oxidation in reference to the carbon cycle because of its water characteristics, featuring water stagnation below the chemocline, oxygen deficiency, and a large accumulation of sulphide in the deeper layers of the lake.

Lake Hiruga

Lake Hiruga, a saline lake is part of the Mikata Lake Group, opening into Wakasa Bay through the narrow and shallow Hiruga waterway and connecting to Lake Suigetsu by the artificial Saga tunnel. Lake Hiruga has a maximum depth of ca. 39 m and a surface area of 0.92 km^2. The lake is surrounded by small mountains except for northernmost part of the lake at which there is the Hiruga waterway. Thus, the lake is suitable for saltwater fish and shellfish farming because of less wind and waves. There are many aquaculture cages for fish preservation and recreational fishing in the lake. Thermal stratification in Lake Hiruga develops in late spring or early summer, due to the surface heating and the decrease in turbulent kinetic energy of the water. It continues until late autumn or winter when it is destroyed by convective overturning. The thermal stratification leads to development of hypolimnic anoxia, and subsequently accumulation of sulphide by means of microbial sulphate reduction. Thus, sulphide was detected in the hypolimnion of Lake Hiruga during summer stagnant period.

On-going Projects

“Decomposition of organic matter by anaerobic protists in aquatic sediments” funded by Japan Society for the Promotion of Science (KAKENHI) (April 2019 - March 2025)

"Eco-physiology of an anaerobic bacterivorous protist in aquatic sediments using genome information" funded by Japan Society for the Promotion of Science (KAKENHI) (April 2024 - March 2028)

“Genome analysis of a novel obligately anaerobic flagellate isolated from the bottom sediment of the seawater Lake Hiruga, Fukui, Japan” funded by Fukui Prefectural University  (May 2023 - March 2024)

Publications

Journal

Mao Tsukamoto, Yuka Machii, Takafumi Kataoka, Ryuji Kondo. Long-read sequencing reveals two chromosomes and one plasmid in Vibrio sp. strain MAO6 isolated from a marine beach in Fukui, Japan. Microbiology Resource Announcements, 13(8):e00369-24 (2024). https://doi.org/10.1128/mra.00369-24

Takafumi Kataoka, Ryuji Kondo. Whole-genome sequence of the strictly anaerobic bacterial strain SANA belonging to the family Gottschalkiaceae, isolated from a xenic culture of an anaerobic protist. Microbiology Resource Announcements 13(6), e00174-24 (2024) https://doi.org/10.1128/mra.00174-24

Yuka Machii, Mao Tsukamoto, Takafumi Kataoka, Ryuji Kondo. Whole-genome sequence of a marine bacterial strain, FRT2, belonging to the genus Leeuwenhoekiella, isolated from the seawater of the Obama Bay in Fukui,  Japan. Microbiology Resource Announcements 13(6), e00277-24 (2024). https://doi.org/10.1128/mra.00277-24

Ryuji Kondo. Pseudodesulfovibrio nedwellii sp. nov., a mesophilic sulphate-reducing bacterium isolated from a xenic culture of an anaerobic heterolobosean protist. International Journal of Systematic and Evolutionary Microbiology 73(4), 005826 (2023). https://doi.org/10.1099/ijsem.0.005826

Ryuji Kondo, Takafumi Kataoka. Whole-genome sequence of a sulfate-reducing bacterial strain SYK isolated from a xenic culture of an anaerobic protist. Microbiology Resource Announcements 12(3), e01257-22 (2023). https://doi.org/10.1128/mra.01257-22

Takafumi Kataoka, Ryuji Kondo. Genome sequence of the sulfate-reducing bacterium, Pseudodesulfovibrio portus JCM 14722T. Microbiology Resource Announcements 11(12), e00947-22 (2022). https://doi.org/10.1128/mra.00947-22

Fumiaki Mori, Yu Umezawa, Ryuji Kondo, Gregory N. Nishihara, Minoru Wada. Potential oxygen consumption and community composition of sediment bacteria in a seasonally hypoxic enclosed bay. PeerJ 9:e11836 (2021). http://doi.org/10.7717/peerj.11836

Alexandra E Rybarski, Frank Nitsche, Jong Soo Park, Paulina Filz, Patricia Schmidt, Ryuji Kondo, Alastair GB Simpson, Hartmut Arndt. Revision of the phylogeny of Placididea (Stramenopiles): Molecular and morphological diversity of novel placidid protists from extreme aquatic environments. European Journal of Protistology 81: 125809 (2021). https://doi.org/10.1016/j.ejop.2021.125809

Takafumi Kataoka, Kako Obayashi, Yuki Kobayashi, Hiroyuki Takasu, Shin-ichi Nakano, Ryuji Kondo, Yoshikuni Hodoki. Distribution of harmful bloom-forming cyanobacterium, Microcystis aeruginosa, in 88 freshwater environments across Japan. Microbes and Environments, 35 (1), ME19110 (2020). https://doi.org/10.1264/jsme2.ME19110

Takafumi Kataoka, Ryuji Kondo. Data on taxonomic annotation and diversity of 18S rRNA gene amplicon libraries derived from high throughput sequencing. Data in Brief, 25, 104213 (2019). https://doi.org/10.1016/j.dib.2019.104213

Takafumi Kataoka, Ryuji Kondo. Protistan community composition in anoxic sediments from three salinity-disparate Japanese lakes. Estuarine, Coastal and Shelf Science, 224, 34-42 (2019). https://doi.org/10.1016/j.ecss.2019.04.046

Fumiaki Mori, Yu Umezawa, Ryuji Kondo, Minoru Wada. Dynamics of sulfate-reducing bacteria community structure in surface sediment of a seasonally hypoxic enclosed bay. Microbes and Environments, 33 (4), 378-384 (2018). https://doi.org/10.1264/jsme2.ME18092

Fumiaki Mori, Yu Umezawa, Ryuji Kondo, Minoru Wada. Effects of bottom-water hypoxia on sediment bacterial community composition in a seasonally hypoxic enclosed bay (Omura Bay, West Kyushu, Japan). FEMS Microbiology Ecology 94 (5) , 1 May 2018, fiy053 (2018). https://doi.org/10.1093/femsec/fiy053

Ryuji Kondo, Misaki Momoki, Makina Yamamoto, Atsushi Kaneda. Spatiotemporal shift in sulphide concentration in hypolimnic water column in Lake Hiruga, a saline lake in Japan. Limnology, 19 (3), 277-283 (2018). https://doi.org/10.1007/s10201-018-0541-7

Ryuji Kondo, Takahiko Okamura. Growth and grazing kinetics of the facultative anaerobic nanoflagellate, Suigetsumonas clinomigrationis. Microbes and Environments, 32 (1), 80-83 (2017). https://doi.org/10.1264/jsme2.ME16113

Sachiko Masuda, Zhihua Bao, Takashi Okubo, Kazuhiro Sasaki, Seishi Ikeda, Ryo Shinoda, Mizue Anda, Ryuji Kondo, Yumi Mori, Kiwamu Minamisawa. Sulfur fertilization changes the community structure of rice root-, and soil-associated bacteria. Microbes and Environments, 31 (1), 70-75 (2016). https://doi.org/10.1264/jsme2.ME15170

Takahiko Okamura, Ryuji Kondo. Suigetsumonas clinomigrationis gen. et sp. nov., a novel facultative anaerobic nanoflagellate isolated from the meromictic Lake Suigetsu, Japan. Protist, 166 (4), 409-421 (2015). https://doi.org/10.1016/j.protis.2015.06.003

Yumi Mori, Takafumi Kataoka, Ryuji Kondo. Use of stable isotope probing to identify bacterial species involved in CO2 fixation in the water just below the oxycline of the meromictic Lake Suigetsu, Japan. Plankton & Benthos Research, 10 (2), 111-120 (2015). https://doi.org/10.3800/pbr.10.111

Ryuji Kondo, Misa Kodera, Yumi Mori, Takahiko Okamura, Shinya Yoshikawa, Kaori Ohki. Spatiotemporal distribution of bacteriochlorophylls in the meromictic Lake Suigetsu, Japan. Limnology, 15 (1), 77-83 (2014). https://doi.org/10.1007/s10201-013-0415-y

Yumi Mori, Takafumi Kataoka, Takahiko Okamura, Ryuji Kondo. Dominance of green sulfur bacteria in the chemocline of the meromictic Lake Suigetsu, Japan as revealed by dissimilatory sulfite reductase gene analysis. Archives of Microbiology, 195 (5), 303-312 (2013). https://doi.org/10.1007/s00203-013-0879-5

Takafumi Kataoka, Takamitsu Homma, Shin-ichi Nakano, Yoshikuni Hodoki, Kako Ohbayashi, Ryuji Kondo. PCR primers for selective detection of intra-species variations in the bloom-forming cyanobacterium, Microcystis. Harmful Algae, 23, 46-54 (2013). https://doi.org/10.1016/j.hal.2012.12.003

Ryuji Kondo, Yumi Mori, Tomoko Sakami. Comparison of sulphate-reducing bacterial communities in Japanese fish farm sediments with different pollution levels. Microbes and Environments, 27 (2), 193-199 (2012). https://doi.org/10.1264/jsme2.ME11278

Takahiko Okamura, Yumi Mori, Shin-ichi Nakano, Ryuji Kondo. Abundance and bacterivory of heterotrophic nanoflagellates in the meromictic Lake Suigetsu, Japan. Aquatic Microbial Ecology, 66 (2), 149-158 (2012). https://doi.org/10.3354/ame01565

Ryuji Kondo, Kotaro Shigematsu, Naoki Kawahara, Takahiko Okamura, Yang Ho Yoon, Tomoko Sakami, Hisashi Yokoyama, Yoshitsugu Koizumi. Abundance of sulphate-reducing bacteria in fish farm sediments along the coast of Japan and South Korea. Fisheries Science, 78 (1), 123-131 (2012). https://doi.org/10.1007/s12562-011-0439-3

Yumi Mori, Kevin J. Purdy, Brian B. Oakley, Ryuji Kondo. Comprehensive detection of phototrophic sulfur bacteria using PCR primers that target reverse dissimilatory sulfite reductase gene. Microbes and Environments, 25 (3), 190-196 (2010). https://doi.org/10.1264/jsme2.ME10109

Ryuji Kondo, Akie Nakagawa, Lisa Mochizuki, Kyoko Osawa, Yukiyasu Fujioka, Junki Butani. Dominant bacterioplankton populations in the meromictic Lake Suigetsu as determined by denaturing gradient gel electrophoresis of 16S rRNA gene fragments. Limnology, 10 (1), 63-69 (2009). https://doi.org/10.1007/s10201-009-0261-0

Naoki Kawahara, Kotaro Shigematsu, Toshiaki Miyadai, Ryuji Kondo. Comparison of bacterial communities in fish farm sediments along an organic enrichment gradient. Aquaculture, 287 (1-2), 107-113 (2009). https://doi.org/10.1016/j.aquaculture.2008.10.003

Ryuji Kondo, Kotaro Shigematsu, Junki Butani. Rapid enumeration of sulphate-reducing bacteria from aquatic environments using real-time PCR. Plankton & Benthos Research, 3 (3), 180-183 (2008). https://doi.org/10.3800/pbr.3.180

Naoki Kawahara, Kotaro Shigematsu, Satoko Miura, Toshiaki Miyadai, Ryuji Kondo. Distribution of sulfate-reducing bacteria in fish firm sediments. Plankton & Benthos Research, 3 (1), 42-45 (2008). https://doi.org/10.3800/pbr.3.42

Ryuji Kondo, Junki Butani. Comparison of the diversity of sulfate-reducing bacterial communities in the water column and surface sediments of a Japanese meromictic lake. Limnology, 8 (2), 131-141 (2007). https://doi.org/10.1007/s10201-007-0201-9

Ryuji Kondo, Kevin J. Purdy, Silvana de Queiroz Silva, David B. Nedwell. Spatial dynamics of sulphate-reducing bacterial compositions in sediments along a salinity gradient in a UK estuary. Microbes and Environments, 22 (1), 11-19 (2007). https://doi.org/10.1264/jsme2.22.11

Ryuji Kondo, Kyoko Osawa, Lisa Mochizuki, Yukiyasu Fujioka, Junki Butani. Abundance and diversity of sulphate-reducing bacterioplankton in Lake Suigetsu, a meromictic lake in Fukui, Japan. Plankton & Benthos Research, 1 (4), 165-177 (2006). https://doi.org/10.3800/pbr.1.165　日本プランクトン学会論文賞

Mitsuhiro Yoshida, Takashi Yoshida, Yukari Takashima, Ryuji Kondo, Shingo Hiroishi. Genetic diversity of the toxic cyanobacterium Microcystis in Lake Mikata. Environmental Toxicology, 20 (3), 229-234 (2005). https://doi.org/10.1002/tox.20102

Ryuji Kondo, David B. Nedwell, Kevin J. Purdy, Silvana de Queiroz Silva. Detection and enumeration of sulphate-reducing bacteria in estuarine sediments by competitive PCR. Geomicrobiology Journal, 21 (3), 145-157 (2004). https://doi.org/10.1080/01490450490275307

Takashi Yoshida, Yasutaka Yuki, Lei Shi, Hedeaki Chinen, Mitsuhiro Yoshida, Ryuji Kondo, Shingo Hiroishi. Quantitative detection of toxic strains of cyanobacterial genus Microcystis by competitive PCR. Microbes and Environments, 18 (1), 16-23 (2003). https://doi.org/10.1264/jsme2.18.16

Masao Adachi, Kimio Fukami, Ryuji Kondo, Toshitaka Nishijima. Identification of marine algicidal Flavobacterium sp. 5N-3 using multiple probes and whole-cell hybridization. Fisheries Science, 68 (4), 713-720 (2002). https://doi.org/10.1046/j.1444-2906.2002.00484.x

Ichiro Imai, Takashi Sunahara, Tetsuya Nishikawa, Yutaka Hori, Ryuji Kondo, Shingo Hiroishi. Fluctuations of the red tide flagellates Chattonella spp. (Raphidophyceae) and the algicidal bacterium Cytophaga sp. in the Seto Inland Sea, Japan. Marine Biology, 138 (5), 1043-1049 (2001). https://doi.org/10.1007/s002270000513

Ryuji Kondo, Ichiro Imai. Polymerase chain reaction primers for highly selective detection of algicidal Proteobacteria. Fisheries Science, 67 (2), 364-366 (2001). https://doi.org/10.1046/j.1444-2906.2001.00253.x

Ryuji Kondo, Noriko Kasashima, Hiroyuki Matsuda, Yoshihiko Hata. Determination of thiosulfate in a meromictic lake. Fisheries Science, 66 (6), 1076-1081 (2000). https://doi.org/10.1046/j.1444-2906.2000.00171.x

Ryuji Kondo, Takashi Yoshida, Yasutaka Yuki. Shingo Hiroishi. DNA-DNA reassociation among a bloom-forming cyanobacterial genus, Microcystis. International Journal of Systematic and Evolutionary Microbiology, 50 (2), 767-770 (2000). https://doi.org/10.1099/00207713-50-2-767

Ryuji Kondo, Go Kagiya, Shingo Hiroishi, Masayuki Watanabe. Genetic typing of a bloom-forming cyanobacterial genus Microcystis in Japan using 16S rRNA gene sequence analysis. Plankton Biology & Ecology, 47 (1), 1-6 (2000). http://www.plankton.jp/PBE/issue/vol47_1/vol47_1_001.pdf

Ryuji Kondo, Go Kagiya, Shingo Hiroishi, Masayuki Watanabe. Rapid DNA extraction from a bloom-forming cyanobacterium. Microbes and Environments, 14 (3), 157-161 (1999). https://doi.org/10.1264/jsme2.14.157

Ryuji Kondo, Ichiro Imai, Kimio Fukami, Akiko Minami, Shingo Hiroishi. Phylogenetic analysis of algicidal bacteria (family Flavobacteriacea) and selective detection by PCR using a specific primer set. Fisheries Science, 65 (3), 432-435 (1999). https://doi.org/10.2331/fishsci.65.432

Ryuji Kondo, Manabu Komura, Shingo Hiroishi, Yoshihiko Hata. Detection and 16S rDNA sequence analysis of a bloom-forming cyanobacterial genus Microcystis. Fisheries Science, 64 (5), 840-841 (1998). https://doi.org/10.2331/fishsci.64.840

Ryuji Kondo, Toshitaka Nishijima, Yoshihiko Hata. Kinetic study on the mineralization of low molecular fatty acids in an anoxic marine sediment. Fisheries Science, 61 (3), 482-486 (1995). https://doi.org/10.2331/suisan.59.1189

Ryuji Kondo, Toshitaka Nishijima, Yoshihiko Hata. Effect of temperature on the production of low molecular fatty acids within an anoxic marine sediment slurry. Nippon Suisan Gakkaishi, 59 (7), 1189-1194 (1993).

Ryuji Kondo, Toshitaka Nishijima, Yoshihiko Hata. Mineralization process of glucose and low molecular fatty acid production in an anoxic marine sediment slurry. Nippon Suisan Gakkaishi, 59 (1), 105-109 (1993). https://doi.org/10.2331/suisan.59.105

Ryuji Kondo, Toshitaka Nishijima, Yoshihiko Hata. Acetate-oxidizing sulfate reduction in anoxic marine sediments. Bulletin of Japanese Society of Microbial Ecology, 5 (2), 29-35 (1990). https://doi.org/10.1264/microbes1986.5.29

Ryuji Kondo, Hideo Kitada, Akira Kawai, Yoshihiko Hata. Low molecular fatty acids in the marine sediments of eutrophic coastal regions. Nippon Suisan Gakkaishi, 56 (3), 519-523 (1990). https://doi.org/10.2331/suisan.56.519

森 郁晃、近藤竜二、梅澤 有、松岡數充、須﨑寛和、中田英昭、和田 実．西九州・大村湾の貧酸素水塊形成期における堆積物微生物群集呼吸の動態．沿岸海洋研究、53 (1)、87－95、(2015)．https://doi.org/10.32142/engankaiyo.53.1_87

近藤竜二、鍵谷 豪、小村 学、幸 保孝、広石伸互、渡辺眞之．シアノバクテリアMicrocystis属の分子分類．日本プランクトン学会報、47 (1)、25-33 (2000)．

近藤竜二、鍵谷　豪、幸　保孝、廣石伸互、渡辺眞之．アオコの分類．日本水産学会誌、64 (2)、291-292 (1998)． https://doi.org/10.2331/suisan.64.291

著書

近藤竜二、中野伸一．湖沼の原生生物、「原生生物学事典」矢崎裕規・新倉　保・猪飼　桂・矢吹彬憲・永宗喜三郎・松崎素道・白鳥峻志・島野智之・小林冨美恵編、朝倉書店、東京、2023年

近藤竜二．海洋の硫黄循環と微生物、「環境と微生物の事典」日本微生物生態学会編集、朝倉書店、東京、2014年

近藤竜二．青潮、「環境と微生物の事典」日本微生物生態学会編集、朝倉書店、東京、2014年

近藤竜二．硫黄循環と細菌の代謝、「増補改訂版　海の環境微生物学」石田祐三郎・杉田治男編、恒星社厚生閣、東京、2011年

近藤竜二．解説、責任編集「いいことおしえてあげる　～びせいぶつのひみつ～」　文：塚本久美子、絵：吉田奈央子、リバネス出版、東京、2008年

近藤竜二．はしがき、コラム、「微生物ってなに」日本微生物生態学会教育部会編著、日科技連出版社、東京、2006年

近藤竜二．硫黄循環と細菌の代謝、「海の環境微生物学」石田祐三郎・杉田治男編、恒星社厚生閣、東京、2005年

近藤竜二、福井　学．酸素のない環境中の微生物；炭素とイオウ代謝を担う嫌気性細菌、「微生物生態学入門‐地球環境を支えるミクロの生物圏－」日本微生物生態学会教育部会編著、日科技連出版社、東京、2004年

近藤竜二．微生物の存在量を求める分子生物学的方法、「微生物生態学入門‐地球環境を支えるミクロの生物圏－」日本微生物生態学会教育部会編著、日科技連出版社、東京、2004年

近藤竜二．硫酸還元細菌、「地球環境調査計測事典　第3巻沿岸域編」竹内均監修、フジ・テクノシステム、東京、2003年

近藤竜二．リン酸態リン、全リン、硫化物（底泥）、DNA/DNAハイブリダイゼーション、「海洋環境アセスメントのための微生物実験法」石田祐三郎・杉田治男編、恒星社厚生閣、東京、2000年

近藤竜二、高田敏夫．三方五湖、「日本の水環境　４　東海・北陸編」（社）日本水環境学会編、技報堂出版、東京、1999年

Proceedings and others

Minoru Wada, Ryuji Kondo, Yu Umezawa, Motohiro Shimanaga, Dongsung Kim, Toshikazu Suzuki, Yuuki Kawabata, Yoshiki Matsushita, Atsushi Ishimatsu, Takashi Aoshima, Hiroyuki Takasu, Takuro Nakamura and Masuo Amano. Feel good in hypoxia? – From microbes to whales, diverse life forms subsist on the “dead zone” in an enclosed bay (Omura Bay, Nagasaki) -. The JSFS 85th Anniversary-Commemorative International Symposium “Fisheries Science for Future Generations” Symposium Proceedings, No. 04001 (2017).

Yumi Mori, Takahiko Okamura and Ryuji Kondo. Population dynamics of phototrophic sulfur bacteria in the meromictic Lake Suigetsu. Proceedings of the 14th International Symposium on the Efficient Application and Preservation of Marine Biological Resources. pp. 36-37, Obama, Japan, 2012.

Takahiko Okamura, Yumi Mori, Shin-ichi Nakano and Ryuji Kondo. Abundance and bacterivory of heterotrophic nanoflagellates in the meromictic Lake Suigetsu, Japan. Proceedings of the 14th International Symposium on the Efficient Application and Preservation of Marine Biological Resources. pp. 34-35, Obama, Japan, 2012.

Shinya Otake, Shingo Hiroishi, Ryuji Kondo, Takashi Yoshida, Moon Ock Lee, Yang Ho Yoon, Hyeon-Seo Cho and Il Huem Park. The Influence of a bivalve farming system on the water quality in coastal waters of Korea. Proceedings of the Fourth World Fisheries Congress, American Fisheries Society Symposium 49:763–777, 2008.

Ryuji Kondo. Genotypic comparison of a phenotypically variable cyanobacterium, Microcystis. Proceedings of the Sixth International Symposium on the Efficient Application and Preservation of Marine Biological Resources. pp. 85-95, Shanghai, China, 2000.

Ryuji Kondo. Sulfate-reducing bacteria: their function in aquatic ecosystems. Proceedings of the Third International Symposium on the Efficient Application and Preservation of Marine Biological Resources. pp. 133-148, Obama, Japan, 1997.

Ryuji Kondo, Toshitaka Nishijima and Yoshihiko Hata. An ecological role of anaerobic bacteria in anoxic marine sediments. Proceedings of International Conference on Ecological System Enhancement Technology for Aquatic Environments (ECOSET '95). Japan International Marine Science and Technology Federation, pp. 77-82, Tokyo, Japan, 1995 (refereed).

Naoyoshi Nishibori, Ryuji Kondo, Takefumi Sagara and Sachio Nishio. Cyclin box sequence in Skeletonema costatum. Bulletin of Shikoku University, (B)23, 69-71 (2006).

Ryuji Kondo and Shingo Hiroishi. DNA-DNA reassociation of Microcystis species with unusual 16S rDNA sequences. Journal of Fukui Prefectural University, 22, 83-86 (2003).

近藤竜二．書評　『アメーバのはなし―原生生物・人・感染症―』，永宗喜三郎・島野智之・矢吹彬憲　編，朝倉書店　ISBN 978-4-254-17168　2,800 円＋税．日本微生物生態学会誌、34(1)、28 (2019)．https://doi.org/10.20709/jsmeja.34.1_28

近藤竜二．湖沼底泥中の嫌気性原生生物の分離・培養と生理．京都大学生態学研究センターニュース、No. 141　July 2018

近藤竜二．“Big microbes”: International workshop on microbial ecology for young scientists、No. 123　March 2014

近藤竜二．琵琶湖水中の超微小細菌の分子生態学的研究．京都大学生態学研究センターニュース、No. 121　July 2013

近藤竜二．シンポジウム記録　沿岸環境の保全と修復における微生物学的側面－有明海再生を目指して－　I-3．汽水域の硫黄循環．日本水産学会誌、78(2)、277 (2012)． https://doi.org/10.2331/suisan.78.277

和田　実、吉永郁生、近藤竜二．シンポジウム記録　沿岸環境の保全と修復における微生物学的側面－有明海再生を目指して－　はじめに．日本水産学会誌、78(2)、274 (2012)． https://doi.org/10.2331/suisan.78.274

近藤竜二、森 裕美、岡村嵩彦、中野伸一．水月湖　～嫌気性微生物生態研究のための天然ラボ～．日本微生物生態学会誌、25(2)、70-74 (2010)． https://doi.org/10.20709/jsmeja.25.2_70

近藤竜二．養殖場堆積物の微生物群集．日本水産学会誌、75(4)、707-708 (2009)． https://doi.org/10.2331/suisan.75.707

近藤竜二．書籍案内「いいことおしえてあげる　～びせいぶつのひみつ～」．日本微生物生態学会誌、24(1)、29 (2009)．

近藤竜二．論文賞を受賞して．日本プランクトン学会報、54(2)、 114-115 (2007)．

加藤賢二、松崎雅之、白崎健一、内田利勝、山口慎一、近藤竜二、広石伸互．栄養剤添加による重油分解・除去技術試験（第１報）-屋外における模擬実験-．福井県環境科学センター年報、27、pp. 48-60（1997）．

加藤賢二、松崎雅之、白崎健一、内田利勝、山口慎一、近藤竜二、広石伸互．栄養剤添加による重油分解・除去技術試験（第２報）-屋内補足実験-．福井県環境科学センター年報、27、pp. 61-66（1997）．

加藤賢二、松崎雅之、白崎健一、内田利勝、山口慎一、近藤竜二、広石伸互．栄養剤添加による重油分解・除去技術試験（第3報）-模擬潮汐による室内実験-．福井県環境科学センター年報、27、pp. 67-74（1997）．

Education

Sorry, this section is written in Japanese.

担当講義の概要

学部

水圏環境科学　Aquatic Environmental Science

　海洋，湖沼，河川などの自然界の水を対象に，それらのもつ物理的，化学的，生物学的性質について学ぶ。各種用水の利用と水質基準や水質汚濁に関する歴史や法令についても若干ふれる。また，水質と密接に関連する微生物の働きと水域環境中での物質の変換機構についても学習する。

海洋微生物生態学実験　Laboratory Course in Marine Microbial Ecology

　顕微鏡の取扱，細菌の性状検査，器具などの滅菌方法，培地の調製方法，無菌操作など微生物学実験の基礎を習得する。海水中の細菌の計数，分離を行い，微生物学的手法および分子生物学的手法を用いた細菌の同定を行う。

海洋生物資源学フィールド演習Ⅰ　Introductory Fieldwork in Marine Biological Sciences I　（時々担当）

　大学での学習に必要なスキルを身につけ、講義や施設見学などを通じて海洋生物資源学部における学習内容とその意義を考える。さらに、グループで協力して課題研究に取り組む。

海洋生物資源学フィールド演習Ⅱ　Introductory Fieldwork in Marine Biological Sciences II

　乗船実習やその準備などを通じて、海洋生物資源学部における学習内容とその意義を考える。また、グループで課題に取り組むことにより、社会が要求する協調性や主体性を持って実習を実行する能力を養う。

海と暮らし　Topics of Marine Life

　海洋生物資源，それらを取りまく環境，水産資源の管理，水産資源生物の増養殖，水産資源の利用および貯蔵，水産流通経済に関する広範な内容について，様々なトピックスを紹介する。近藤は「海洋細菌の働き」について講義する。

科学英語Ⅱ　Scientific English II　（時々担当）

　海洋生物資源関連分野の英語で書かれた書籍や文献をテキストとし，適宜解説を加えながら講読させ，内容を理解させる。

生物学Ⅱ　Biology II　（5回分担当予定）

　海洋生物資源学を学ぶうえで必要な生物学の基礎を講義する。

大学院

海洋微生物生態学　Marine Microbial Ecology　（5回分担当）

　海洋生態系における微生物生態学の基礎理論と自然界での微生物が関わる素過程について解説する。

海洋生態環境学特論Ⅱ　Special Lecture in Aquatic Microbial Ecology　（隔年開講、2回分担当）

　水圏生態系における微生物の生態ならびに生化学，生理学を論述する。