Assertion: tern's number | /r/CapableOf | drop once the most prevalent tern
Facets:
value: from almost 400 nesting pairs
type: OTHER
value: in the 1960s
type: TEMPORAL
value: in the lake champlain basin
type: LOCATION
value: to 50 in 1988
type: TEMPORAL
Source sentences:
text: Once the most prevalent tern in the Lake Champlain basin, their numbers dropped from almost 400 nesting pairs in the 1960s to only 50 in 1988.