Effects of habitat fragmentation on a tube-nesting wasp, Anterhynchium fravomarginatum (Hymenoptera: Eumenidae) in newly developed urban area

doi:10.24713/hitotoshizen.26.0_9

Habitat fragmentation strongly affects species distribution and abundance. However, mechanisms underlying fragmentation effects are still a matter of debate. We studied if nest-colonization pattern of tube-nesting wasp, Anterhynchium flavomarginatum (Smith) (Hymenoptera: umeninae), is affected by habitat fragmentation, and then examined what is the relative importance of mechanisms that influence pattern of nest colonization by wasp. Trap nests of A. flavomarginatum were set in 77 sites of a new town within satoyama area in Sanda City, Hyogo, Japan. In the sites, its original habitat has been fragmented into patches by development of the new town. The results showed that nest colonization by wasp was restricted to sites near marginal town edges bordered on satoyama areas. However, transplantation experiment of A. flavomarginatum into sites in the central zone of town revealed that colonized sites were significantly increased in the zone. Furthermore, results of model selection of the relationship between three measures of sensitivity to fragmentation, i.e. distance from satoyama area, remaining forest coverage, and connectivity of sites, with nest colonization by wasp extracted only the connectivity as an important parameter. Hence, we conclude that nest-colonization pattern of A. flavomarginatum in fragmented habitats was influenced more significantly by habitat connectivity than by habitat degradation and isolation.

Effects of habitat fragmentation on a tube-nesting wasp, Anterhynchium fravomarginatum (Hymenoptera: Eumenidae) in newly developed urban area

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