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! Year
! Year
! Abundance estimate (95% Confidence Interval)
! Abundance estimate (95% Confidence Interval)
! Density estimate (per km2)
! Density estimate (per km²)
! Encounter rate
! Encounter rate (nests per km²)
! Area
! Area
! Method
! Method
|1983
|1983
|
|
|0.24 individuals/km²
|0.24
|present
|present
|southeastern sector of the park (50 km²)
|southeastern sector of the park (50 km²)
|
|
|
|
|0.27 signs/km
|0.27
|Sapo National Park, excluding south east area
|Sapo National Park, excluding south east area
|transect survey
|transect survey
|Western chimpanzee
|Western chimpanzee
|2009
|2009
|1,079 (CI: 713-1,633)
|1079 (713-1633)
|0.86 individuals/km²
|0.86
|4.05 nests/km
|4.05
|Sapo National Park, excluding mining areas
|Sapo National Park, excluding mining areas
|transect survey
|transect survey
|Western chimpanzee
|Western chimpanzee
|2016-2017
|2016-2017
|1,055 (CI: 595-1,870)
|1055 (595-1,870)
|0.83 individuals/km²
|0.83
|encounter rate
|
|Sapo National Park, excluding south east area
|Sapo National Park, excluding south east area
|transect survey
|transect survey