Cormorant nesting sites have a unique impact on the environment, potentially negatively affecting tree health. The City of Toronto and the Toronto and Region Conservation Authority (TRCA) work together to monitor and manage cormorant nesting behaviour. Strategies primarily encourage ground-nesting while discouraging nesting in healthy trees. TRCA management strategies incorporate tree health assessment through annual evaluations of cormorant nesting activity on the area tree canopy.
For more information on cormorant management, please visit the TRCA web site: cormorant management and Tommy Thompson park Management Report