The change of butterfly assemblages after artificial gap formation in an urban park

  • Published source details Yamamoto K. & Tuhara Y. (2004) 人工ギャップ造成とその造成後年数がチョウ類の種組成に及ぼす影響. Journal of the Japanese Institute of Landscape Architecture (1994+), 68, 585-588.


This study is summarised as evidence for the following.

Action Category

Clear or open patches in forests

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Butterfly and Moth Conservation
  1. Clear or open patches in forests

    A replicated, controlled study in 2001–2004 in an urban evergreen forest in the Kansai region, Japan (Yamamoto & Tuhara 2004) found that small cleared patches in the forest had a higher abundance and species richness of butterflies than the forest interior, but both abundance and species richness decreased with time since clearing. Two to three years after clearing, the abundance (56–142 individuals) and species richness (14–19 species) of butterflies in cleared patches was higher than in uncleared patches in the forest interior (abundance: 11 individuals; richness: 9 species). However, in the four patches cleared in the first year, abundance and species richness were higher in the year after clearing (abundance: 161 individuals; richness: 20 species) than three years after clearing (abundance: 76 individuals; richness: 18 species). In 2001 and 2002, four patches/year (15 × 15 m each) were cleared within a mature ring-cupped oak Quercus glauca and Japanese bay tree Machilus thunbergii forest (0.16–0.20 trees/m2). From April–September 2004, butterflies were surveyed three times/month in each cleared patch, and in four nearby patches of forest interior, for 10 minutes/plot. The four patches cleared in 2001 were surveyed in the same way in 2001.

    (Summarised by: Andrew Bladon)

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