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Heron colony disturbance



The USFWS Habitat Index model for Great Blue Herons (Short and Cooper 1985.  
USFWS Biol Rep 82) recommends a "disturbance-free zone of 250 meters".  
Obviously there are many herons to don't require such a large area, but the 
recommendation is intended as a guideline - whether the birds will abandon 
the colony will probably depend upon their previous exposure to disturbance 
and a number of other variables.

Roy S. Slack
234 Besaw Road
Phoenix, NY  13135