Invasiva främmande arter: försiktighetsprincipen som förutsättning för effektiva åtgärder

Sammanfattning: Biological diversity is an essential prerequisite for life on earth and for the function of its ecosystems. Without biological diversity the ecosystems will eventually collapse, and it is thus necessary to maintain a healthy level of variation at ecological-, species- and genetic- level. Invasive alien species (IAS) are now recognized as the second highest threat to biological diversity. As a result, new legislation aiming to counteract the increasing issues with IAS are introduced e.g. in the EU. The purpose of this essay is to evaluate the function and importance of the precautionary principle regarding the control of IAS, using legal analysis. The legal analysis is complemented by an analysis of other scientific sources e.g. in order to describe biological diversity in general as well as the real and potential the ecosystem-consequences of the introduction of species. EU environmental law is based on the precautionary principle and so is thus the newly established IAS Regulation. The IAS Regulation requires an extensive riskassessment before a species will be encompassed by the regulation. The risk-assessment process does however not entirely correspond with the (strong version of the) precautionary principle, as actions in accordance with this principle requires an assumed risk, which must not necessarily be scientifically established. This results in a discrepancy between the legal definition and the actual definition of an IAS; species which have undergone the risk-assessment process can obtain the status of IAS (legally) whilst others, which has not yet been assessed or do not fulfil all criteria, do not have this status and are thus not covered by the legislation. There are 12 000 alien species within the EU, of which 1800 are considered invasive. However, only 49 different species are currently covered by the IAS-regulation. This cannot be considered to be in keeping with the (strong version of the) precautionary principle.