Assertion: tern's habitat | /r/CreatedBy | other changes
Facets:
value: to river systems
type: OTHER
Source sentences:
text: The interior subspecies, with a current population of about 7000 pairs, was listed as an endangered subspecies in 1985 (estimated 1000 breeding pairs), due to loss of habitat caused by dams, reservoirs, channelization, and other changes to river systems.