Work due 01 Jan 2099

SUGGESTIONS FOR IMPROVEMENT As knowledge increases and databases are improved it may be possible to develop the indicator element 'Cumulative number of alien species in Europe since 1900' to distinguish the invasive alien species (will need e.g. harmonised criteria to identify invasive species). The indicator might be expanded to include almost all of the pan-European countries as the DAISIE project (14) gateway on Invasive Alien Species becomes operational by end 2007. A further step to improve the list of 'Worst invasive alien species threatening biodiversity in Europe' would be to collect additional layers of information on a subset of IAS which is well documented in terms of trends in distribution, abundance or ecological impact and associated costs. Distribution and abundance data could then be presented on a pan‑European map with a spatial resolution of, for example, 50x50 km. When data coverage overlaps it is envisaged to combine in hte same graphs the information on 'Cumulative number of (invasive) alien species in Europe since 1900' with the 'Worst invasive alien species' (from 1990); and separately present additional layers of information on impact and distribution, for example, more detail on which species is alien or could also be classified as invasive in which part of Europe. A global cooperation to develop the CBD indicator 'Trends in invasive alien species' has been initiated by the CBD secretariat. The SEBI 2010 Expert group on trends in invasive alien species is represented in this work, which also may affect the further development of the indicator 'Invasive alien species in Europe'. (14) EU RTD project 'Delivering Alien Invasive Species Inventories for Europe' see http://www.daisie.ceh.ac.uk/