Survey of Grauer's Gorillas ( Gorilla gorilla graueri ) and Eastern Chimpanzees (Pan troglodytes schweinfurthi) in the Kahuzi-Biega National Park Lowland Sector and Adjacent Forest in Eastern Democratic Republic of Congo

摘要: We describe the distribution and estimate densities of Grauer's gorillas (Gorilla gorilla graueri) eastern chimpanzees (Pan troglodytes schweinfurthi) in a 12,770-km2area lowland forest between Lowa, Luka, Lugulu, Oku rivers Democratic Republic Congo, site largest continuous population gorillas. The survey included total 480 km transects completed within seven sampling zones Kahuzi-Biega National Park sector adjacent Kasese region approximately 1100 footpath reconnaissance. populations 7670 (4180–10,830) weaned 3350 (1420–5950) individuals areas. Within same area, we 2600 (1620–4500) chimpanzees. Ape nest are significantly higher than more remote area spite encounter rate human sign park. Comparison our data with information obtained by Emlen Schaller during first rangewide 1959 suggests that have remained stable protected areas but declined forest. These findings underscore key role played national parks protecting biological resources recent political economic turmoil region. also show reconnaissance is reliable cost-effective method to assess forested