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A Method for Quantifying Foliage-Dwelling Arthropods
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Understanding long-term primate community dynamics: implications of forest change.

Colin A Chapman1, Thomas T Struhsaker, Joseph P Skorupa

  • 1McGill School of Environment, McGill University, Montreal, Quebec, Canada H3A 2T7. colin.chapman@mcgill.ca

Ecological Applications : a Publication of the Ecological Society of America
|March 31, 2010
PubMed
Summary

Long-term primate population data reveals complex responses to habitat changes in Uganda. Some species declined despite stable food, while others thrived unexpectedly, suggesting nonequilibrium states require large protected areas.

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Area of Science:

  • Ecology
  • Primatology
  • Conservation Biology

Background:

  • Population declines are often driven by complex interactions between environmental and biotic factors.
  • Long-term data is crucial for understanding these dynamics, particularly for long-lived species like large mammals.
  • Habitat disturbance can significantly impact species persistence.

Purpose of the Study:

  • To determine the causes of primate group density changes in Kibale National Park, Uganda.
  • To link population dynamics to habitat structure and food availability over 26-36 years.
  • To investigate the impact of varying habitat disturbance intensities on primate populations.

Main Methods:

  • Utilized 26-36 years of population and habitat data.
  • Calculated primate group density using line transect data.
  • Quantified changes in habitat structure (cumulative diameter at breast height [dbh]) and food availability (cumulative dbh of food trees).
  • Assessed changes in food nutritional quality for one species.

Main Results:

  • Mangabey and black-and-white colobus group densities increased; blue monkeys declined; redtails and red colobus remained stable.
  • Blue monkey and mangabey group densities changed despite no significant changes in food availability.
  • Black-and-white colobus group density increased even with decreased food availability in unlogged forests.
  • Red colobus group density remained stable despite increasing food availability and quality in logged areas.

Conclusions:

  • Primate populations in Kibale National Park appear to be in nonequilibrium states.
  • Species' responses to habitat changes are complex and not solely driven by food availability.
  • Large, interconnected protected areas are necessary to buffer against localized population declines through regional compensation.