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Department of Biological Sciences
Molecular Neuroscience
Developmental Biology
Cellular Genetics
Molecular Genetics
Plant Development and Physiology
Cellular Biochemistry
Evolutionary Genetics
Plant Environmental Responses
Environmental Microbiology
Animal Ecology
Plant Ecology
Systematic Zoology
Systematic Botany
Photosynthetic Microbial Consortia
Photo Systematic Zoology Laboratory
See below for research topics conducted by each faculty member.
Asc Prof Katsuyuki Eguchi e-mail
Asc Prof Adam L. Cronin e-mail
Ast Prof Takahiro Yoshida e-mail
Systematics and Biogeography of Terrestrial Invertebrates
Katsuyuki Eguchi
(in collaboration with Ast Prof. Francesco Ballarin)
We are conducting systematic and phylogeographical studies on various groups of terrestrial arthropods, mainly in East Asia and Southeast Asia. In addition, we are studying the distribution, habitat and life history of alien ants (Formicidae) on islands such as the Ogasawara Islands and the Izu Islands, and are contributing to control measures. We welcome Asian students and young researchers who are interested in taxonomy and phylogeography as graduate students and postdocs.

For details (published articles etc.) see:

These research topics are conducted in collaboration with Dr. Francesco Ballarin (Special Appointed Assistant Professor). For details of his research see:

We are conducting joint research projects with researchers belonging to various institutions in East and Southeast Asia. We have also accepted many international students. We welcome students, graduate students, and visiting researchers who want to actively enjoy such international circumstances.

[Press release]

Behavioural and Evolutionary Ecology
Adam L. Cronin
(A) Myrmecina nipponica (B) Netlogo model used to assess the importance of spatial structure in the evolution of alternative life-history strategies, in this case alternative reproductive strategies in ant communities.
Social Organisms as Complex Systems
Highly integrated animal societies such as colonies of social insects can achieve complex tasks far beyond the capabilities of any single individual. These often sophisticated collective tasks are achieved without centralised leadership and with only rudimentary individual intelligence. We study how groups can compile information to exploit the intelligence of the swarm, and how swarm-based systems may be more robust and flexible than individuals in the execution of group tasks such as decision making and collective movement.

Evolutionary-ecology of Life-history Strategies
Social organisms can exploit a range of life-history strategies unavailable to individual organisms, and this may help explain their success in adapting to different environments. Social insects, for example, have a range of adaptive mechanisms to cope with different environments, including alternative reproductive strategies, shifts in trophic ecology and/or variation in social structure. We explore the evolutionary ecology of these adaptive mechanisms using a combination of field-based ecological and behavioural studies, computer simulations, natural isotopic analysis, and molecular phylogenetic and population genetic analyses.
Natural History of Beetles Living in Cryptic Habitats
Takahiro Yoshida
Numerous insect species live in cryptic habitats (e.g. under/in/on rock, bark, branches and leaves of dead trees, mashrooms, animal droppings, litter, moss, nests of social insects). Most primitive insects, Bristletails, occur under bark of dead trees or rocks, and a lot of subsequent lineages have invaded such cryptic habitats. The invasion to such cryptic habitats may immeasurably promote the superradiaton of Insecta. Otherwise, most of them have small and inconspicuous colored bodies for the adaptation to cryptic habitats, and their biology has been poorly studied. To properly interpret how they have diversed in the cryptic habitats, comprehensive studies including taxonomy, phylogeny, morphology and ecology on various taxon associated with cryptic habitats are required.
Beetles are extraordinary diversified and constitute about 25% of described species of all organisms. Beetles are characterized by the hardened forewings, so-called elytra, which protect their membranous hindwings. Elytra enable them to invade cryptic habitats, which is the one of most likely explanation for the beetle diversification. The study of natural history of the cryptic beetles will provide new important insights for the understanding of biodiversity on Earth. So, I am studying the natural history of such beetles, especially the superfamily Cucujoidea: Taxonomy, Morphology, Phylogeny, Ecology and Evolution. My published papers are listed in the below links:

Otherwise, I also welcome students, graduate students and Postdocs loving natural history, biodiversity and/or systematics of non cryptic beetles and other arthropods.
Recent Publications
  1. Planas-Sitjà, I., Deneubourg J-L & Cronin, A. L. (in press). Variation in personality can substitute for social feedback in coordinated animal movements. Communications Biology.
  2. Ghosh, P. & Cronin, A. L. (2021). Collective decision-making, caste roles and sequential transport during colony emigration in the small carpenter ant,Camponotus yamaokai. Ethology DOI: 10.1111/eth.13140
  3. Cronin, A. L, Azuma, N., Miyazaki, S., Oguri, E., Schwarz, M. P. & Ito, F. (2020). Geographic patterns in colonial reproductive strategy in Myrmecina nipponica: links between biogeography and a key polymorphism in ants. Journal of Evolutionary Biology 33: 1192-1202.
  4. Ogura Y, Yamamoto A, Kobayashi H, Cronin AL, Eguchi K. 2017. New discovery of an exotic Ant Technomyrmex brunneus (Formicidae: Dolichoderinae) on Hachijo-jima, Izu islands, an oceanic island of Tokyo prefecture, Japan. ARI — Journal of Myrmecological Society of Japan, 38, 45-52.
  5. Cronin AL, Monnin T, Sillam-Dussès D, Aubrun F, Fédérici P, Doums C. 2016. Qualitative bias in offspring investment in a superorganism is linked to dispersal and nest inheritance. Animal Behaviour, 119, 1–9.
  6. Cronin AL. 2016. Group-size advantages to decision making are environmentally contingent in house-hunting Myrmecina ants. Animal Behaviour, 118, 171–179.
  7. Cronin AL, Loeuille N, Monnin T. 2016. Strategies of offspring investment and dispersal in a spatially structured environment: a theoretical study using ants. BMC Ecology, 16, 4.
  8. Cronin AL, Chifflet-Belle P, Fédérici P, Doums C. 2016. High inter-colonial variation in nestmate relatedness and diverse social structure in a desert ant from Mongolia. Insectes Sociaux, 63, 87–98.
  9. Cronin AL, Donnerhack O, Seidel F, Yamanaka T. 2015. Fine-scale variation in natural nitrogen isotope ratios of ants (Hymenoptera: Formicidae) Entomologia Experimentalis et Applicata 157, 354–359.
  10. Cronin AL. 2015. Individual and group personalities characterise consensus-decision making in an ant. Ethology, 121, 703–713.
  11. Cronin AL, Stumpe MC. 2014. Ants work harder during decision making in small groups. Journal of the Royal Society Interface, 11(98), 20140641
  12. Cronin AL. 2014. Ratio-dependent quantity discrimination in quorum sensing ants. Animal Cognition, 17, 1261–1268.
  13. Cronin AL. 2013. Synergy between pheromone trails and quorum responses underlies consensus decision making in an ant. Behavioral Ecology and Sociobiology, 67, 1643–1651.
  14. Cronin AL. 2013. Conditional use of social and private information guides house-hunting ants. PLoS ONE, 8(5), e64668.
  15. Cronin AL, Molet M, Doums C, Monnin T, Peeters C. 2013. Recurrent evolution of dependent colony foundation across eusocial insects. Annual Review of Entomology, 58, 37–55.
  16. Doums C, Cronin AL, Ruel C, Fédérici P, Haussy C, Tirard C, Monnin T. 2013. Facultative use of thelytokous parthenogenesis in the polyandrous ant Cataglyphis cursor. Journal of Evolutionary Biology, 26, 1431–1444.
  17. Cronin AL. 2012. Consensus decision making in the ant Myrmecina nipponica: house-hunters combine pheromone trails with quorum responses. Animal Behaviour, 84, 1243–1251.
  18. Cronin AL, Fédérici P, Doums C, Monnin T. 2012. The influence of intraspecific competition on resource allocation during dependent colony foundation in a social insect. Oecologia, 168, 361–369.
  19. Chéron B, Cronin AL, Doums C, Fédérici P, Haussy H, Tirard T, Monnin T. 2011. Unequal resource allocation among colonies produced by fission in the ant Cataglyphis cursor. Ecology, 92, 1448–1458.
  20. Cronin AL, Doums CD, Monnin T. 2011. Opportunities for mate choice in the fission-performing ant Cataglyphis cursor. Ecological Entomology, 36, 522–525.
  21. Cronin AL, Bridge C, Field JP. 2011. Climatic correlates of temporal demographic variation in the tropical hover wasp Liostenogaster flavolineata. Insectes Sociaux, 58, 23–29.
  22. Cronin AL, Monnin T. 2010. Self sacrifice in edesperadof contests between relatives. Frontiers in Zoology, 7, 27. doi:10.1186/1742-9994-7-27.
  23. Cronin AL, Monnin T. 2009. Bourgeois queens and high stakes games in the ant Aphenogaster senilis. Frontiers in Zoology, 6, 24. doi:10.1186/1742-9994-6-24.
©2015 Department of Biological Sciences, Tokyo Metropolitan University