Colonization and Barrier Permeability

A habitat that is highly fragmented for a fish species with low capacity to pass barriers may function as a well-connected unit for other species with better swimming and jumping capacities. In this WP we will therefore quantify the permeability of natural and man-made barriers for a number of fish species that are either of conservation concern or known to be invasive. A review will be combined with empirical estimates of passage probabilities to produce a set of species-specific models that relates colonization probability to dispersal distance and the local slope and height of barriers. Models estimated in this WP and in WP2 will be used in Task 3.3 and Task 4.2 (WP leader Göran Englund).