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This is a list of 100 of the "worst" invasive species in the Global Invasive Species Database.〔(【引用サイトリンク】title=100 of the World's Worst Invasive Alien Species )〕 The IUCN Invasive Species Specialist Group (ISSG), which maintains the list, acknowledges that "It is very difficult to identify 100 invasive species from around the world that really are 'worse' than any others."〔 == Criteria for inclusion == Two criteria were used in selecting items for the list: * An invasive species' "serious impact on biological diversity and/or human activities"; and * That species' "illustration of important issues surrounding biological invasion".〔 According to the ISSG, "only one species from each genus was selected. Absence from the list does not imply that a species poses a lesser threat."〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of globally invasive species」の詳細全文を読む スポンサード リンク
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