Department of Biosphere Resources Science

Division of Ecosystem Conservation


  FAX: +81-52-789-5518
Prof. HIJII, Naoki D. Agr. hijii@
Assoc. Prof. KAJIMURA, Hisashi D. Agr. kajimura@
Asst. Prof. TOKI, Wataru D. Agr. tokiw@

Spatiotemporal distribution of collembolans on Japanese cedar trees

Our research aim is to clarify biotic and abiotic factors responsible for biological phenomena and ecological events in forest ecosystems, which could have various effects upon the health and sustainability of the ecosystems, including biodiversity. Ecology, forest sciences, and evolutional biology are fundamental knowledges in our research fields.
The research projects can be divided into the following major topics:

  1. Mechanisms and evolutional processes of the symbiotic interactions between insects and their associated fungi and bacteria (ambrosia and bark beetles, wood wasps, ambrosia gall midges, etc.);
  2. Structure and function of arthropod communities in tree canopies and in the soil, with special reference to litter dynamics and community structures of decomposers in relation to the vertical stratification in forests;
  3. Spatiotemporal patterns of forest insects and insect-plant interactions (wood-boring insects, seed insects, gall-forming wasps, mycophagous insects, parasitoid wasps, etc.);
  4. Conservation of herbaceous and forest ecosystems based on the management of biological communities.

Recent publications:

  1. Kobune S, Kajimura H, Masuya H, Kubono T (2011) Symbiotic fungal flora in leaf galls induced by Illiciomyia yukawai (Diptera: Cecidomyiidae) and in its mycangia. Microbial Ecology 63: 619-627.
  2. Yoshida T, Hijii N (2011) Microarthropod colonization of litter in arboreal and soil environments of a Japanese cedar (Cryptomeria japonica) plantation. Journal of Forest Research 16: 46-54.
  3. Fukumoto H, Kajimura H (2011) Effects of asynchronous acorn production by co-occurring Quercus trees on resource utilization by acorn-feeding insects. Journal of Forest Research 16: 62-67.
  4. Ishikawa H (2011) Effects of dung beetles on seedling emergence from herbaceous seeds in the dung of sika deer (Cervus nippon) in a temperate Japanese grassland ecosystem. Ecological Research 26: 725-734.
  5. Kawasaki Y, Ito M, Miura K, Kajimura H (2010) Superinfection of five Wolbachia in the alnus ambrosia beetle, Xylosandrus germanus (Blandford) (Coleoptera: Curculiondae). Bulletin of Entomological Research 100: 231-239.
  6. Ito M, Kajimura H (2009) Genetic structure of Japanese populations of an ambrosia beetle, Xylosandrus brevis (Curculionidae: Scolytinae). Environmental Entomology 38: 1324-1335.
  7. Mizuno T, Kajimura H (2009) Effects of ingredients and structure of semi-artificial diet on the reproduction of an ambrosia beetle, Xyleborus pfeili (Ratzeburg) (Coleoptera: Curculionidae: Scolytinae). Applied Entomology and Zoology 44: 363-370.
  8. Karasawa S, Hijii N (2009) Oribatid communities (Acari: Oribatida) associated with bird's nest ferns (Asplenium nidus complex) in a subtropical Japanese forest- a mini-review. Trends in Acarology (MW Sabelis, J Bruin eds): 149-153.