| 要旨トップ | 目次 | 日本生態学会第59回全国大会 (2012年3月,大津) 講演要旨
ESJ59/EAFES5 Abstract


一般講演(ポスター発表) P2-119A (Poster presentation)

The variety of indirect effects of deer bark stripping

*Tanaka, M. Nakamura, M. (Hokkaido Univ.)

Mammal herbvory often induce changes in plant traits. The plant responses to herbivory vary with spatial different parts of the plants. It is predicted that the spatial different plant responses may cause various indirect effects on other herbivores that feed on different parts of the plant. We focused on deer (Cervus nippon yesoensis) bark stripping to willow (Salix sachalinensis). To examine the effects of deer bark stripping on traits of the willow and the indirect effects on other herbivores, we conducted an experiment of artificial bark stripping on trunks. We observed three spatial different parts of the willow: 1) canopy leaves, 2) bark stripped points of trunks, and 3) basal sprouting shoots. Our study obtained three main results. 1) The canopy leaves of willow trees that stripped bark had higher secondary compounds and lower insect herbivory. 2) Aphids (Cavariella japonica and Taberolachnus salignus) aggregated to bark stripped points because deer bark stripping make it easy for aphids to access to phloem sap. Attending ants (Lasius japonicus) also increased. 3) The sprouting shoots increased by bark stripping and deer preferred to browse these sprouting shoots rather than current year shoots. Our study suggests that spatial different responses of the willow to deer bark stripping caused not only positive but also negative indirect effects on other herbivores.


日本生態学会