Managing visitor access to seabird colonies:
a spatial simulation and empirical observations
Beale CM (2007) Ibis, 149(s1):102-111
Managers of wildlife reserves have a range of tools available to them when considering the best way to provide visitor access while avoiding as many of the
negative effects of human disturbance as possible. However, managers lack guidelines as to whether conservation interests are best met by spreading visitors
thinly throughout a reserve or by aggregating them in a small area. Here I describe how relationships between disturbance impact and disturbance pressure
(the dose-response curve) can be used to address this issue. I generate spatial simulation of two different models of visitor distribution (one more
aggregated than the other) and explicitly model disturbance impact for a variety of dose-response curves. I show that the optimal visitor distribution is
likely to depend on the sensitivity of the species and the overall visitor pressure. Importantly, I find that in certain circumstances optimal management
can shift from one management option to the other if visitor numbers cross a certain threshold. I use published relationships predicting nesting success of
Common Guillemot Uria aalge and Black-legged Kittiwake Rissa tridactyla to assess optimal management at three nature reserves in Scotland. Optimal
management for Guillemots depends on the number of people and the distance between the people and the birds. At sites with high disturbance pressures.
Management should aim to aggregate visitors in as small an area as possible, whereas at sites with lower disturbance pressure, an even distribution of
visitors is favoured. Kittiwake models were not generally accurate, and consequently only site-specific guidelines could be generated, where an even
distribution was favoured.
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