Abstract
The definition of a species' range is difficult as the population density of a species generally decreases gradually from the core distribution area to the edge. Species' ranges and their boundaries are scale-dependent: they vary greatly within a species depending on the spatial scale used. I studied the ranges of 50 forest passerines in Finland based on atlas maps, which contain information of species' presence in 10 × 10 km squares. I combined the information of atlas maps at different scales of resolution (10 × 10 km, 20 × 20 km, 40 × 40 km, 80 × 80 km) within 160 × 160 km blocks. I calculated a fractal dimension, D, in n log-log regression analysis between the number of inhabited squares at different scales and scales of resolution
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