森林内につくられた道と土壌中の小形節足動物相の変化 : 福島県土湯温泉附近の調査例

概要

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Change in soil microarthropod communities was studied in connection with distances from a narrow forest pass constructed eleven years ago. The density of the main animal groups, Acari and Collembola, and the species number of Oribatida decreased sharply toward the pass. However, in contrast with the case of highways, many arthropod groups such as Araneida, Oniscidae, Pauropoda, Diplopoda, Lepidoptera (larvae), Diptera (larvae), Coleoptera (larvae) and Pselaphidae are still living also in the vicinity of the pass outside the forest edge. Among the oribatid species three species groups were discriminated based on the different susceptibilities to environmental changes: (1) very susceptible group (Eulohmannia ribagai, Apolohmannia gigantea, Nemacepheus dentatus, etc.), (2) a little susceptible group (Brachychthonius hungaricus, Poecilochtonius italicus, Nanhermannia nana, etc.), and (3) non-susceptible group (Oppiella nova, Tectocepheus velatus, etc.