A Vascular Plant Red Data List for Wales - Plantlife

A VA S C U L A R P L A N T R E D D ATA L I S T F O R WA L E S6.5 Modification of Wales Red Data ListcategoriesThe modification of IUCN categories in Wales to take account of possible immigration fromEngland (as described in section 5.2 above) is dealt with in three columns. For all threatenedtaxa, an assessment is made of the probability that the entire Welsh range could be replacedby immigration from England (Immigration likely? column).This is based on each species’ecology, its proximity to England and how dynamic the GB population is.The Dynamismscore (Preston et al., 2003) ranges from 5 for highly dynamic species whose distributionschange rapidly, to 1 for sedentary species whose distributions remain largely static over time.Taking these considerations into account, the IUCN category may have been modifiedaccording to Figure 1 (Section 5.2). If a modification has been made (“Yes” in the Categorymodified? column) the modified category is given in the main Wales Red List column and anote in the Comments column indicates what the original category was.This latter columnalso includes other notes and observations relevant to the taxon in Wales.17