Diversity of carabid beetle assemblages in Utsunomiya University Forest at Funyu
2015
Washimi, Y. (Utsunomiya University, Utsunomiya, Tochigi (Japan). Faculty of Agriculture, Department of Forest Science) | Aizawa, M. | Kubota, K. | Shibuya, S. | Ohkubo, T.
We assessed the species diversity and composition of carabid beetle assemblages in Utsunomiya University Forest at Funyu, northern Tochigi Prefecture. We captured carabid beetles once a month between May and November in 2013 using 15 pitfall traps set at 4 plots located in the hinoki cypress plantation, Japanese cedar plantation, secondary deciduous broadleaved forest, and hinoki plantation clear-cut in the previous year. Additionally, we set two flight interception traps at each plot for 10 days to investigate the invasion by flying carabid beetles. Forest environmental factors such as dominance of herb layer and mean canopy openness were also measured at each plot. The total number of carabid beetles captured was 566 (27 species), of which, Carabus albrechti tsukubanus was most dominant. Invasion by flying carabid beetles occurred rarely. The number of species and diversity indices were high in the clear cutting forest. Principal coordinate analysis results showed that species composition in the clear cutting forest was clearly different from that in the other forest types. High species diversity in the clear cutting forest might have resulted from the increased number of carabid beetles in the grass-type habitat, such as the Harpalina species, and the reduced number of species in the forest-type habitat, such as Carabus albrechti tsukubanus. Furthermore, clear differences in species composition were observed among the different forest types, which corresponded to the differences in the forest environment.
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