Administration - Conference & other proceedings

Johnson, T. H. (1990). Responses of breeding peregrine falcons to human stimuli. Paper presented at the Proceedings of the Southwest Raptor Management Symposium and Workshop.

Abstract

For each observation of stimulus and response, the nature, size or loudness, and the horizontal and vertical position and direction of motion of each stimulus with respect to the falcon were recorded, stimuli were grouped into three categories, aircraft, machinery, and people. Peregrine falcon behavioral responses to human stimuli were classed into four levels. A function based on the distance and intensity of the stimulus is proposed to quantify the stimulus intensity. These were used to examine 135 observed peregrine responses to various human stimuli. Stimulus values for each level or response have a range of 39-47db, reflecting the wide variability of peregrine responses to given stimuli. However, stimulus values within the four classes of response have similar distributions and are consistently higher with response level. Lowest stimulus values were used to calculate the largest response distances to a standard stimulus. These distances define two management zones, within 900m and 3400m of suitable nest sites.

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