Abstract
The list of harmful species for ecosystem was primarily created through compiling plants specialists' knowledge. However, collection of species' information and discussion takes a long time. A simple, but still effective evaluation method, needs to be created to be able to take quick countermeasures against alien species. The authors made a prototype evaluation model for evaluating alien species' invasiveness based on species characteristics. This new model showed high positive correlation between Pheloung (1999) and John & Linda's (2002) models, when 50 species growing in Japan were applied. Also, among all 200 of The list of harmful species for ecosystem, 48 species, including 16 invasive alien special species were extracted as “extremely high invasiveness” by the new model. However, 13 species were determined to have “no invasiveness,” proving that the model needs further improvement.
