• What does population trend mean?

    Population trend refers to changes over time and can include changes in ranging behaviour (e.g., distance and route) and distribution, biogeography (e.g., size of population) and life-history (e.g., birth and death rates). For example, the Taï National Park, Côte d’Ivoire, thought to be one of the final strongholds of the endangered West African chimpanzee Pan troglodytes verus has benefited from long-term research over the years. Surveys conducted in 1989-1990 were repeated in 2007 to update knowledge on chimpanzee abundance and distribution within this region. The survey found a significant decrease in chimpanzees in all but three of the 11 sites surveyed in the 17 year survey gap, a tenth of the total assumed population size (Campbell et al., 2008). The decline was attributed to a 50% increase in human population growth associated with greater poaching pressure and a higher deforestation rate, and was exacerbated by civil war.

  • How do ape populations change?

  • How do you determine trends in ape popuations?

  • Why is it important to understand population trends?

Compiled and edited 2011 by Kay H. Farmer
Reviewed by Hjalmar Kuehl, Josephine Head and Neba Funwi-Gabga

  • References