Assertion: estuary's water | /r/HasProperty | filtered by oyster
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: Historically, waters of the Potomac and other Chesapeake region estuaries were filtered by oysters, but as their populations declined so did their filtration capabilities.
text: Historically, waters of the Potomac and other Chesapeake region estuaries were filtered by oysters, but as their populations declined so did their filtration capabilities.