Assertion: sea otter's population | /r/CapableOf | decline by as much as 90%
Facets:
value: since the late 1980s
type: TEMPORAL
Source sentences:
text: Killer whale (Orcinus orca) predation has had even larger population-level effects on sea otters, most notably in the Aleutian Islands where populations have declined by as much as 90% since the late 1980s (Estes et al., 1998, 2005; Doroff et al., 2003; Springer et al., 2003; Williams et al., 2004).