Page 149 - A bird’s-eye view of recreation - Rogier Pouwels
P. 149

Finally, for the three interventions the maximum number of visitor groups per ha per year was determined within a radius of 500 m for each breeding pair. Using Function 1, the corrected number of breeding pairs was determined. The Cpdi is summed to predict the population size. For the current situation this resulted in the number of breeding pairs from the survey itself as Ibpdi equals Ibpdcurrent. As some values within the 500 m buffers are very high, we cut off the impact of visitors at the impact of 100 000 visitors, resulting in a minimum index of 25% of breeding bird densities.
Function 1 Ipbdcurrent is the Index of the breeding pair density based on the recreation pressure in the current situation
Appendices
                        Cbpi is the corrected number of breeding pairs for a specific intervention
Ipbdi is the Index of the breeding pair density based on the recreation pressure for a specific intervention
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