Environmental Impact - Wildlife/Vegetation Effects

Anderson, D. W. (1988). Dose-response relationship between human disturbance and brown pelican breeding success? Wildlife Society Bulletin 16: 339-345.

Abstract

The brown pelican nesting colony at Isia Coronado Norte was monitored from 1969 to
1987. Most of the activity on the island is related to a fishing camp. There was essentially only one type of human disturbance, humans walking along trails to visit cache sites at various locations. The disturbances were only related to trails, and occurred once every 1-2 weeks throughout the nesting season each year. Anderson found that the colony has been disturbed to such an extent that nesting success has been reduced and nesting populations on that island are threatened. Nest abandonment’s increased with nearness to human activity, and human disturbance versus nesting success followed a typical dose-response pattern. Pelicans were
affected at distances less than about 600m, illustrating the sensitivity of brown pelicans to human disturbance.

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