Abstract
Edge effect denotes that animals trapped in a grid stem are caught in border traps at disproportionately high frequencies. This is presumed due partly to home ranges overlapping the grid and partly to immigration onto the grid after depletion of population. A new method of correcting for this edge effect is developed. It consists of two steps the first of which is essentially to correct for the edge effect while the second estimates the number of true residents on the grid area. The second step may be replaced by any alternative method of estimating the number in a closed population, if the assumptions are met. No special trapping design is required; the method needs only a andard square or rectangular grid system of trap station. This feature is of prime importance since this method is thus applicable to data derived from the most common type of trap design. By using data from various small mammal studies in Scandinavia, the method is demonstrated to fit data and to work. From the total number of animals caught on a trapping grid, the edge effect is estimated to account for up to 65%.
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