Kondo Ryuji


Affiliation Faculty of Marine Science and Technology / Department of Marine Bioscience
Title Professor
Room Faculty of Marine Science and Technology 705 (Extension1705)
E-mail rykondo ( at = @ )
Education United Graduate School of Agricultural Sciences, Ehime University
Degree Ph.D. in Agriculture
Academic Societies Japanese Society of Microbial Ecology
The Japanese Society of Fisheries Science
The Plankton Sciety of Japan
International Society for Microbial Ecology
Career 1992 Assistant Professor, Fukui Pref. Univ.
1997 Lecturer, Fukui Pref. Univ.
2005 Associate Professor, Fukui Pref. Univ.
2013 Professor, Fukui Pref. Univ.

Research Interest

Research Field Microbial Ecology
Research Summary My research deals with aquatic microbial ecology. I focus on anaerobic microbes such as sulphate-reducing bacteria, phototrophic sulphur bacteria and heterotrophic nanoflagellates with reference to carbon and sulphur cycling in marine and limnic environments.
Keywords Bacteria, HNF, Eutrophication, Water pollution, Water/sediment quality, Microbial ecology

Selected Publications

Book chapter
"I can tell you somethig good - mystery of microbes -" Leave a nest, 2008 (in Japanese)

"What are microbes?" Nikkagiren, 2006 (in Japanese)

"Microbiological methods for assessment of the marine environments (revised and enlarged)" Kouseisha-Kouseikaku, 2006 (in Japanese)

"Environmental microbiology of the sea" Kouseisha-Kouseikaku, 2005 (in Japanese)

"Introductory microbial ecology" Nikkagiren, 2004 (in Japanese)

"Encyclopedia of measurement and analysis on global environment" Fuji Technosystem, 2003 (in Japanese)

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)

Potential oxygen consumption and community composition of sediment bacteria in a seasonally hypoxic enclosed bay. PeerJ 9:e11836 (2021)

Distribution of harmful-bloom-forming cyanobacterium, Microcystis aeruginosa, in 88 freshwater environments across Japan. Microbes and Environments 35(1), ME19110 (2020)

Data on taxonomic annotation and diversity of 18S rRNA gene amplicon libraries derived from high throughput sequencing. Data in Brief, 25, 104213 (2019)

Protistan community composition in anoxic sediments from three salinity-disparate Japanese lakes. Estuarine, Coastal and Shelf Science, 224, 34-42 (2019)

Dynamics of sulfate-reducing bacteria community structure in surface sediment of a seasonally hypoxic enclosed bay, Microbes and Environments 33(4), 378-384 (2018).

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).

Spatiotemporal shift in sulphide concentration in hypolimnic water column in Lake Hiruga, a saline lake in Japan,Limnology, 19(3), 277-283 (2018).

Growth and grazing kinetics of the facultative anaerobic nanoflagellate, Suigetsumonas clinomigrationis, Microbes and Environments, 32(1), 80-83 (2017).

Sulfur fertilization changes the community structure of rice root-, and soil-associated bacteria, Microbes and Environments, 31(1), 70-75 (2016).

Suigetsumonas clinomigrationis gen. et sp. nov., a novel facultative anaerobic nanoflagellate isolated from the meromictic Lake Suigetsu, Japan. Protist, 166, 409-421 (2015).

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 and Benthos Research, 10, 111-120 (2015).

Spatiotemporal distribution of bacteriochlorophylls in the meromictic Lake Suigetsu, Japan. Limnology, 15: 77-83 (2014).

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: 303-312 (2013).

PCR primers for selective detection of intra-species variations in the bloom-forming cyanobacterium, MicrocystisHarmful Algae, 23: 46-54 (2013).

Comparison of sulphate-reducing bacterial communities in Japanese fish farm sediments with different pollution levels. Microbes and Environments, 27: 193-199 (2012).

Abundance and bacterivory of heterotrophic nanoflagellates in the meromictic Lake Suigetsu, Japan. Aquatic Microbial Ecology, 66: 149-158 (2012).

Abundance of sulphate-reducing bacteria in fish farm sediments along the coast of Japan and South Korea. Fisheries Science, 78: 123-131 (2012).

Comprehensive detection of phototrophic sulfur bacteria using PCR primers that target reverse dissimilatory sulfite reductase gene. Microbes and Environments, 25: 190-196 (2010).

Comparison of bacterial communities in fish farm sediments along an organic enrichment gradient. Aquaculture, 287: 107-113 (2009).

Comparison of the diversity of sulphate-reducing bacterial communities in the water column and the surface sediments of a Japanese meromictic lake. Limnology, 8: 131-141 (2007).

Spatial dynamics of sulphate-reducing bacterial compositions in sediment along a salinity gradient in a UK estuary. Microbes and Environments, 22: 11-19 (2007).

Abundance and diversity of sulphate-reducing bacterioplankton in Lake Suigetsu, a meromictic lake in Fukui, Japan. Plankton & Benthos Research, 1: 165-177 (2006).

Detection and enumeration of sulphate-reducing bacteria in estuarine sediments by competitive PCR. Geomicrobiology Journal, 21: 145-157 (2004)

Community Engagement

Councillor of the Japanese Society of Microbial Ecology (Jan 2007 - Dec 2010, Jan 2013 - Dec 2016, Jan 2019 - present)
Committee member of the nuclear safety commission of Fukui Prefecture (Apr 2015 - present)

Educational Activites

Classes Undergraduate: Biology, Aquatic Microbial Ecology, Aquatic enviromental science, Laboratory course in marine microbial ecology, Introductory fieldwork in marine bioscience
Office Hour
Available Topics 1. Environmental microbiology: detection, identification, ecology and physiology
2. Matter cycling in aquatic environments: microbial function and water chemistry
3. Environmental science in aquaculture fields: water/sediment quality in fish farm

Additional Information

Degree: Ph.D. Ehime University, 1992
Awards: Best article award of the Plankton Society of Japan (2007)