Citation: Sandvik, H., and B.-E. Sæther (2012) Testing og modifisering av modeller for å estimere spredning og etablering av fremmede arter. [Tests and modifications of models to estimate spread and establishment of alien species (in Norwegian with English abstract)]. Utredning for Direktoratet for naturforvaltning, 10(7), 1–51.
Key words: Alien species, ecological risk assessment, invasion biology, modelling of spread, quantitative set of criteria, spread velocity.
Risk assessments of alien species in Norway is currently
based on a novel quantitative classification system that takes the species’s
invasion potential and their ecological effects into account. The estimation of
invasion potential is grounded in a modelling of the species’s rates of
establishment and spread. This report summarises the methodological improvements
that are suggested to the classification system. We present an improvement of
existing models, development of novel models and a test of these models by means
of 14 real and 200 simulated datasets on biological invasions.
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