Zone de Texte: Invasive alien species: a species, subspecies or lower taxon, (according to CBD) introduced outside its natural past or present distribution whose introduction and/or spread threatens biological diversity. There are many desirable alien plants, embellishing parks, gardens, and landscapes. Only very few cause problems, but these problems can be massive. „Tens Rule“: 10 % of introduced species spread, 10 % of these establish, and 10 % of the established species cause problems (= 0,1%). ? PRA is important to identify these few species! Zone de Texte: Invasive alien plants Zone de Texte: Gritta Schrader October 2004 Zone de Texte: Federal Biological Research Center for Agriculture and Forestry Department for Plant Health, Braunschweig, Germany

Previous
1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17 
Next