Abstract
AbstractThe distribution, species composition and abundance of carabid beetles in monospecific plantations of three different coniferous tree species (Japanese spruce,Sakhalin fir and larch) were investigated by baited pitfall traps inHokkaido,Japan. In total, 16 150 carabid beetles consisting of 31 species in 13 genera were collected in 2011 and 2012. The most predominant species wasPterostichus thunbergii Morawitz, followed bySynuchus melantho(Bates) andCarabus opaculus(Putzeys). Average numbers of beetles per trap were significantly reduced in larch. Large‐sizedCarabusspecies (C. arboreus arboreus Lewis andC. opaculus) were collected in large numbers inJapanese spruce. There was no significant difference in diversity and equitability among the three kinds of plantation. The ordination of redundancy analysis showed that medium‐sized forest generalists,Pterosticus subovatus(Motschulsky) andP. thunbergii, were highly associated withJapanese spruce andSakhalin fir, and the forest specialistSynuchus nitidus(Motschulsky) was withSakhalin fir. In contrast, in larch there was no such associated forest species, and some species ofCarabus,PterostichusandSynuchuswere considerably reduced in number, suggesting that larch has unfavorable effects on some forest species. The most important environmental variables influencing carabid assemblages were soil moisture and foliage layer cover. Practices in forest management to minimize the effects of plantations on carabid assemblages are discussed.
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