Naturalized plants in Hokkaido and the Kurils

Hideki TAKAHASHI1, Vyacheslav Yu. BARKALOV2, Alexander A. TARAN3
1 The Hokkaido University Museum, Sapporo, Japan
2 Institute of Biology and Soil Science FEB RAS, Vladivostok, Russia
3 Sakhalin Branch of Botanical Garden-Institute, Yuzhno-Sakhalinsk, Russia

Endangered and naturalized species are the main themes (now known as Red List and Blue List, respectively) in conservation biology. In this presentation, we show the present conditions of naturalized plants in Hokkaido and the Kuril Islands. At present, there are about 2200 vascular plant species including about 600 naturalized ones (ca. 27 %) in Hokkaido, and about 1 400 species including about 200 naturalized ones (ca. 14 %) in the Kurils. The number and percentage of the naturalized plants reflect the temperature, area size, and the human activities in these regions. Hokkaido is and/or will become one of the main sources of supply of naturalized plants to the Kuril Islands. Hokkaido published the "Blue List of Hokkaido" in 2010, in which all the naturalized species have been categorized by their potentially harmful influence on the natural ecosystems. The most harmful naturalized plants have been categorized as A2 rank; those are Aegopodium podagraria (Apiaceae); Ambrosia artemisiaefolia var. elatior, Cirsium vulgare, Hieracium aurantiacum, H. pratense, Hypochaeris radicata, Leucanthemum vulgare, Rudbeckia laciniata, Solidago altissima, Solidago gigantea var. leiophylla, Taraxacum officinale (Asteraceae); Nasturtium officinale (Brassicaceae); Robinia pseudoacacia, Trifolium pratense, Trifolium repens (Fabaceae); Iris pseudacorus (Iridaceae); Plantago lanceolata (Plantaginaceae). In order to preserve the natural vegetation in the Kuril Islands, the present conditions of these harmful naturalized plants from Hokkaido shall be monitored in the Kurils. New aliens also must be studied. We hope to compile and publish a Blue List in the Kurils.

© 2012 Organizing Committee