Madeleine Freudenreich1, Guillaume Fried2, Emmanuelle Sarat3 and Arnaud Albert1
1French Biodiversity Agency (AFB), Research, Science-advice and Data Division (Dred), Vincennes, France
2French Agency for Food, Environmental and Occupational Health and Safety (Anses), Plant Health Laboratory (LSV), Montferrier-sur-Lez, France
3French Committee of the International Union for Conservation of Nature (IUCN), French Invasive Alien Species Resource Center (CDR), Orléans, France
The EU Regulation no. 1143/2014 on invasive alien species (IAS) provides a set of measures to be taken by Member States in relation to IAS included on the Union list. Management is one of three distinct types of measures envisaged. According to Article 19 of this Regulation, Member States shall have in place effective management measures ofIAS which have been found to be widely spread in their territory.
In this framework, the French Biodiversity Agency (AFB) has identified seven invasive alien plants (IAP) that are widely spread in France: Baccharis halimifolia, Elodea nuttallii, Heracleum mantegazzianum, Impatiens glandulifera, Ludwigia grandiflora, Ludwigia peploides and Myriophyllum aquaticum. In connection with the French Environment Code, the National IAS Strategy and the French Biodiversity Plan, the AFB is developing national management strategies (NMS) for each of these IAP. The main goal of a NMS is to provide a decision support tool for regional co-ordinations and local managers in order to determine priority populations and interventions. Indeed, not all populations must be managed, not all populations can realistically be managed due to lack of means, and national eradication is no longer conceivable for widespread species. Choices thus have to be made on how and where to manage the existing populations. This poster uses the Giant Hogweed as a case of explanation for NMS.
First, a short and general description of the biology and ecology of the species is provided to obtain useful characteristics for management options. Secondly, a climatic niche modelling of the species is performed to identify potential distribution, based on the level of climatic suitability and the number of already established populations, allowing to define and coordinate measures between administrative regions, with different and adapted global management objectives. Thirdly, several criterions (spread risk, real impacts, etc.) are used to prioritize populations and sectors within these regions. Finally, local management objectives (eradication, control or containment) are proposed for each selected population, based on site conditions and technical feasibility. Moreover, current management interventions and existing local strategies are taken in account and mentioned in the national strategy, and an overview of the best management practices is provided. Related measures (surveillance, residuals, restoration, etc.) are also evoked.
To conclude, effective prioritization of species and pathways are prerequisites for the management of IAS, as recognized by the Convention on Biological Diversity. However, prioritization of colonized sites, mainly for widespread species, remains a big challenge in order to obtain a successful and concerted national management of species populations, with the aim of truly minimizing its adverse impacts on biodiversity and related ecosystem services, and for preventing further spread.