Assertion: cormorant's population | /r/HasProperty | reduced by half
Facets:
value: to sustain at least 500 nests
type: PURPOSE
Source sentences:
text: The four largest cormorant colonies on northern Door County islands (Hat Island west of Egg Harbor, Jack Island west of Peninsula State Park, Spider Island east of Newport State Park and Pilot Island east of the Northport Ferry docks) contain more than 10,000 pairs; managers recommend these populations be reduced by half to sustain at least 500 nests in each colony, with a total of about 5,000 nests at the four colony sites.