Assertion: cormorant's population | /r/HasProperty | reduced throughout north america
Facets:
value: in the early 1900s
type: TEMPORAL
Source sentences:
text: Populations of Double-crested Cormorants were reduced throughout North America in the early 1900s, but their numbers have increased phenomenally since 1970 attributed to decline in contamination by chlorinated hydrocarbons (especially DDT), reduction in human persecution via protective laws, increased food availability in breeding and wintering areas associated with the creation of artificial water impoundments, increased breeding habitat via dead standing trees in reservoirs, and associated improved breeding success (Hatch and Weseloh 1999, Wires et al. 2001).