Assertion: brook trout | /r/HasProperty | significant contributor
Facets:
value: in the northern rocky mountains
type: LOCATION
value: to extirpation
type: TRANSITIVE-OBJECT
Source sentences:
text: In the northern Rocky Mountains, non-native brook trout are considered a significant contributor to the decline or extirpation of native cutthroat trout (Oncorhynchus clarki) in headwater streams.