• Genetic signatures of a demographic collapse in a large-bodied forest dwelling primate (Mandrillus leucophaeus)

      Ting, Nelson; Astaras, Christos; Hearn, Gail; Honarvar, Shaya; Corush, Joel; Burrell, Andrew S.; Phillips, Naomi; Morgan, Bethan J.; Gadsby, Elizabeth L.; Raaum, Ryan; et al. (2012)
      It is difficult to predict how current climate change will affect wildlife species adapted to a tropical rainforest environment. Understanding how population dynamics fluctuated in such species throughout periods of past climatic change can provide insight into this issue. The drill (Mandrillus leucophaeus) is a large-bodied rainforest adapted mammal found in West Central Africa. In the middle of this endangered monkey's geographic range is Lake Barombi Mbo, which has a well-documented palynological record of environmental change that dates to the Late Pleistocene. We used a Bayesian coalescent-based framework to analyze 2,076 base pairs of mitochondrial DNA across wild drill populations to infer past changes in female effective population size since the Late Pleistocene. Our results suggest that the drill underwent a nearly 15-fold demographic collapse in female effective population size that was most prominent during the Mid Holocene (approximately 3-5 Ka). This time period coincides with a period of increased dryness and seasonality across Africa and a dramatic reduction in forest coverage at Lake Barombi Mbo. We believe that these changes in climate and forest coverage were the driving forces behind the drill population decline. Furthermore, the warm temperatures and increased aridity of the Mid Holocene are potentially analogous to current and future conditions faced by many tropical rainforest communities. In order to prevent future declines in population size in rainforest-adapted species such as the drill, large tracts of forest should be protected to both preserve habitat and prevent forest loss through aridification.
    • Regional Action Plan for the Conservation of the Nigeria-Cameroon Chimpanzee (Pan troglodytes ellioti)

      Morgan, Bethan J.; Adeleke, Alade; Bassey, Tony; Bergl, Richard; Dunn, Andrew; Fotso, Roger; Gadsby, Elizabeth; Gonder, Mary Katherine; Greengrass, Elisabeth; Koulagna, Denis Koutou; et al. (IUCN/SSC Primate Specialist Group and Zoological Society of San Diego, 2011)
      This document represents the consensus of views from forestry and wildlife conservation agencies in Nigeria and Cameroon, local and international nongovernmental conservation organizations, and university-based researchers who met at a series of workshops in Cameroon and Nigeria to formulate a set of actions that, if implemented, will increase the long-term survival prospects of the Nigeria-Cameroon chimpanzee.
    • Regional Action Plan for the Conservation of the Nigeria–Cameroon Chimpanzee (Pan troglodytes ellioti)

      Morgan, Bethan J.; Adeleke, Alade; Bassey, Tony; Bergl, Richard; Dunn, Andrew; Fotso, Roger; Gadsby, Elizabeth; Gonder, Mary Katherine; Greengrass, Elisabeth; Koulagna, Denis Koutou; et al. (IUCN/SSC Primate Specialist Group and Zoological Society of San Diego, 2011)
      This document represents the consensus of views from forestry and wildlife conservation agencies in Nigeria and Cameroon, local and international nongovernmental conservation organizations, and university-based researchers who met at a series of workshops in Cameroon and Nigeria to formulate a set of actions that, if implemented, will increase the longterm survival prospects of the Nigeria-Cameroon chimpanzee, Pan troglodytes ellioti. The Nigeria-Cameroon chimpanzee is the most endangered of all currently recognized chimpanzee subspecies, with a total remaining population of between 3,500 and 9,000 living in forested habitat to the north of the Sanaga River in Cameroon, the eastern edge of Nigeria, and in forest fragments in the Niger Delta and southwestern Nigeria