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1990-2011
出版Europoean Environment Agency, 2013
ISBN92921340279789292134020
URLhttp://books.google.com.hk/books?id=Z02AnQAACAAJ&hl=&source=gbs_api
註釋This report presents the European Grassland Butterfly Indicator, based on national Butterfly Monitoring Schemes (BMS) in 19 countries across Europe, most of them in the European Union. The indicator shows that since 1990 till 2011 butterfly populations have declined by almost 50 %, indicating a dramatic loss of grassland biodiversity. This also means the situation has not improved since the first version of the indicator published in 2005.