Naturalization of the alien plant Lantana camara L. in coastal areas of the Seto Inland Sea, western Japan

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  • 瀬戸内海沿岸域における外来植物ランタナ(シチヘンゲ)の野生化
  • セトナイカイ エンガンイキ ニ オケル ガイライ ショクブツ ランタナ(シチヘンゲ)ノ ヤセイカ

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Abstract

Lantana camara L. (Verbenaceae), an ornamental plant native to South America, has become widely naturalized in many countries, where it threatens native ecosystems and agriculture. Because of its negative impacts, this species is listed among the top 100 of the World's Worst Invasive Alien Species by IUCN. To date, information regarding the naturalization and distribution of L. camara in Japan is rather limited. This study was undertaken to ascertain the current status of naturalization of L. camara in coastal areas of the Seto Inland Sea and to examine the relationship between its distribution and winter temperature. Coastal areas and islands in Hiroshima Prefecture were selected as the study area. The area was divided into 4000 1 × 1-km meshes using GIS. Five hundred meshes were selected for the field survey by eliminating forested areas where L. camara growth was unlikely. An extensive survey was conducted during May-December 2010; L. camara was found at 186 points, 47 of which were assumed to include naturalized plants. The study area experienced exceptionally cold weather in January 2011, with a monthly mean air temperature below 5℃. However, a field survey conducted during July-November 2011 revealed that most individuals survived the winter. These results suggest that the cold tolerance of L. camara is higher than has been described in previous reports.

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