Carabid Beetle Assemblages in Secondary Deciduous Broad-leaved Forests With Or Without Litter Removal in Northern Kanto

27 Mar Carabid Beetle Assemblages in Secondary Deciduous Broad-leaved Forests With Or Without Litter Removal in Northern Kanto

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Abstract

栃木県茂木町の毎年落葉採取が行われている広葉樹二次林と未採取の林において，オサムシ科甲虫群集の多様性と群集組成を調べた。落葉採取の有り・無しの各3林分にそれぞれ1プロットを設置して，2012年5月～11月の月1回，1プロット当り15個のピットフォールトラップを3日間設置してオサムシ科甲虫を捕獲した。また各プロットの環境要因（A0層厚，ササ量，開空度など）およびミミズ密度を調査した。その結果，落葉採取の有無によって林床環境に明確な違いがみられたが，オサムシ科甲虫の種多様性や群集組成に大きな差異はみられなかった。

English Abstract

We investigated the species diversity and composition of carabid beetle assemblages in secondary deciduous broad-leaved forests in which litter is or is not removed annually to make compost in Motegi, Tochigi Prefecture, northern Kanto. The census for carabid beetles was conducted once a month from May to November in 2012, using 15 pitfall traps per plot, in three litter removal plots and three non-litter removal plots. Environmental factors (e.g., litter thickness, domi nce of dwarf bamboo, and mean openness) and the density of earthworms were also measured in each plot. The environment of the forest floor was obviously different between the forests with or without litter removal. However, no clear differences in the diversity and community composition of carabid beetles were found between the forest floor treatments.