NPO picchio Wild Bear Mt.Asama
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Meadow Ecosystem
Forest Ecosystem

Japanese Great Tit (Parus major)

Our studies involve color-coded leg ringing of individuals to examine individual breeding success, pairing behavior, and history of home range. These studies have shown that unexpected shortage of nest sites caused competition for nests between the great tit and the varied tit (Parus varius). This competitive behavior has been proposed as one of the reasons for failures in offspring production of the great tit.

Owls (Strix uralensis ) & Buzzards (Buteo buteo)

Strix uralensis
The nocturnal owl and the diurnal buzzard share different niches in the environment. However, they do share a common ground, namely their diet of mice and insects. Our group is involved in monitoring these dietary organisms, are thereby enabling evaluation of owl and buzzard habitat quality.

Other Birds

Turdus chrysolaus
Another study that we have enthusiastically carrying out since 1994 is a line transect investigation of Yachou-no-mori (a bird sunctuary) area. The Brown-Headed Thrush (Turdus chrysolaus), Eastern-Crowned Warbler (Phylloscopus coronatus), and Long-Tailed Rosefinch (Uragus sibiricus) are some species that have been found to be declining rapidly and, although the cause is still unknown, are now at the brink of extinction.

Japanese Giant Flying Squirrels (Petaurista leucogenys)

Karuizawa is located in the cold district, and expected to produces unique characteristics among these squirrels; including marked differences in breeding seasons and intensity, as well as changes in seasonal resource use. Our fundamental studies have revealed that these squirrels are able to exist in environments strongly influenced by human interferences.

Japanese Dormice (Glirulus japonicus)

Injecting medicine for euthansia
The Japanese dormouse is a natural treasure and is at the brink of extinction. But the densities of the mice in some Karuizawa forests is expected to be higher than those reported in other Japanese regions.
An interesting discovery by our team is the intricate relationship between the dormouse and the small Japanese field mouse (Apodemus argenteus) that stocks seeds of Parabenzoin praecox in nest holes. This relationship has not been identified in other regions of Japan. Other ongoing studies include investigations of the social behavior exhibited during breeding, and its effects on the ecosystem.