Shigeaki Kojima / Professor / Division of Environmental Studies
Department of Natural Environmental Studies / / Evolutionary ecology of marine organisms and marine environmental changes (Japanese only)

Career Summary
1985: Graduated from Faculty of Science (University of Tokyo)
1990: Received doctorate of Science from University of Tokyo
1990: Researcher (Tsukuba University)
1992: Research associate (University of Tokyo)
1998: Associate Professor (University of Tokyo)
2008: Professor (University of Tokyo)
Educational Activities
Undergradiate school:Marine Biology
Graduate school:Deep-sea Environmental Science
Research Activities
1. Evolutionary ecology and conservation of deep-sea chemosynthesis-based communities.
Hydrothermal deposits and methane hydrate under the deep-sea bottom have recently been focused on as metal and energy resources for the future. However, many endemic species form chemosynthesis-based communities around such resources. To conserve these faunal communities, we are investigating the fauna in such environments using submersibles and remotely operated underwater vehicles well as molecular ecological analyses of the population structure of endemic species.
2. Population structures of benthic species around Japan.
We are analyzing the genetic population structures of dominant coastal benthic species around Japan to reveal the effects of marine environmental changes. We are also analyzing the effects of artificial introduction as well as global warming on the geographical distribution and genetic characteristics of coastal species.
3. Foundation process of deep-sea fauna of the Japan Sea.
We are estimating the genetic differentiation of dominant deep-sea demersal fish between the Japan Sea where drastic environmental changes are repeated with glacial and interglacial cycles, and the neighboring sea areas. To reveal the factors determining the interspecific difference of the genetic deviation, we are studying the larval ecology of these species using elemental and isotopic analyses of otoliths.
4. Temporal and spatial changes of deep-sea benthic communities in trenches.
We are analyzing spatial and temporal changes of deep-sea meiofaunal communities and the mechanisms founding such patterns. We are starting investigation of the change and recovery processes of the communities in the off-Sanriku area associated with the Great East Japan Earthquake.
1) Watanabe and Kojima: Dispersal and speciation of hydrothermal-vent endemic animal groups. In:"Dynamics of Ocean Biosystems 1, Evolution in the Sea: Molecular Phylogenetic Approaches to the Marine Biodiversity", pp. 244-260, 2009 (in Japanese).
2) Kojima, Watanabe and Fujikura: Estimation of history of hydrothermal activities based on evolutionary ecology of chemosynthesis-based communities. Journal of Geology Vol. 118, pp. 1174-1185, 2009 (in Japanese).
3) Watanabe, Fujikura, Kojima, Miyazaki, and Fujiwara: Japan: Vents and seeps in close proximity. In "The Vent and Seep Biota, Topics in Geobiology 33", pp. 379-401, 2010.
4) Kojima: Dispersal and genetic deviation of benthic organisms in the coastal areas around Japan. In:"Dynamics of Ocean Biosystems 5, Ocean and Life -Seeking the view of life for marine organisms", Tokai University Press, pp. 141-154, 2009 (in Japanese).
5) Kojima, Adachi, and Kodama: Formation of deep-sea fauna and changes of marine enrironment in the Japan Sea. Fossils Vol. 82, pp. 67-71, 2007 (in Japanese).
Other Activities
Secretary of the Japanese Association of Benthology
Editorial board of the Japanese Association of Benthology
Editorial board of the Oceanographic Society of Japan
Editorial board of the Malacological Society of Japan
Future Plan
1. Establishment of methodologies to conserve chemosynthesis-based communities in the developments of deep-sea metal and energy resources.
2. Estimation of effects of future global environmental changes on deep-sea ecosystems.
3. Studies of biodiversity and dynamics of deep-sea ecosystems using new bioinfomatic technologies.
Messages to Students
For a scientist, acquisition of a doctor's degree is never the goal but the first relay point of his/her career. Sometimes, you should try to take it easy and imagine your long life as a scientist.