Bwindi Mountain gorillas at 400

The results for the fourth Bwindi Mountain gorilla census were announced yesterday by the Uganda Ministry of Tourism, Wildlife, and Antiquities and the Uganda Wildlife Authority (UWA). It is now official that Bwindi is a home to 400 gorillas, close to half of the world’s population that is estimated at 880 individuals. This result has taken a staggering twenty months of intensive gorilla search, counting and genetic analysis. Pictures generously provided by Theresa Laverty, MPI-EVA research assistant.

Rukina from the Kyagurilo research group, Bwindi-Ruhija

Conducted by the Uganda Wildlife Authority, the 2011 Bwindi Mountain gorilla census was an effort of a big collaboration involving many organizations that work in Mountain gorilla conservation including; l’Institut Congolais pour la Conservation de la Nature (ICCN), the Rwanda Development Board, International Gorilla Conservation Programme, the Max Planck Institute for Evolutionary Anthropology (MPI-EVA), the Institute of Tropical Forest Conservation, Conservation Through Public Health, the Mountain Gorilla Veterinary Project, and the Dian Fossey Gorilla Fund International. WWF-Sweden funded the census with more support from Berggorilla & Regenwald Direkthilfe e.V., the Wildlife Conservation Society, and the Max Planck Institute for Evolutionary Anthropology.

Earlier today, I had a privilege to chat with the director of the Bwindi Mountain gorilla project, Dr. Martha Robbins. Ladies and gentlemen, lets hear from the horse’s mouth (the lead scientist) for the 2011 Bwindi Mountain gorilla census. Please find the details of our Q&A chat in BM and MR below:

BM: Thanks a lot Martha for allowing talking to me after a very short notice.

MR: Sure


BM: May you please tell our readers what Mountain gorillas are? What makes them different from other primates, and great apes in general?

MR: The Mountain gorillas are one of the two and four gorilla species and sub-species respectively. They have many differences compared to chimpanzees and Bonobos. Their bodies are much bigger…actually they are the biggest apes.


BM: Bwindi is a home to 400 Mountain gorillas, close to half of the World’s population. This is the highest number of gorillas ever recorded in Bwindi. Why the big difference in numbers compared to the previous census?

MR: We count gorillas using the sweep method, where teams intensively walk through the forest in a dense network of trails searching for gorillas. Analyzing for the genetic make-up (genetic analysis) of feces allows us to differentiate if the gorilla groups encountered during the sweeps are the same or different. Genetic analysis creates a genetic identification for every gorilla that we find feces from, and this helps us not to over or under count the gorillas.

One limitation of the single sweep means that we can only count or do genetic analysis on the gorillas we find. The assumption that we find all the gorillas in a single sweep is not necessarily accurate. This time around we did two sweeps, meaning that there are some groups we found only during the 1st sweep and some groups only during the 2nd sweep. Genetic analysis was later done for both sweeps. This is the only way that we can know for sure that the groups from both sweeps are the same or different.


BM: What does this result mean to the conservation world, and mountain gorilla conservation in particular.

MR: This result means several things. First of all, the Mountain gorillas are the only sub-species of the great ape where we see the population actually increasing, and that provides some hope for conservation not only for the Mountain gorillas but of other endangered great apes and other primates. The increase and the hope that this population is sustainable depends only on the continuation of extremely intensive conservation efforts both inside the park and also with the neighboring communities living outside the park, Uganda as a country and in terms of international support at all levels.


BM: Any additional remarks for our readers?

MR: Lastly I want to say that the end result from a census is one number so it may seem easy to determine, but the censuses are only possible through a very big collaboration among many organizations, involving many individuals. Some where between 80-100 people were involved in last census.  These censuses are a way to really bring together all organizations that work in Mountain gorilla conservation, and this one has resulted in some very good news about how all the efforts of all these organizations are paying off. I thank all the organizations mentioned above for their efforts that made this census a great success.

Kanywani and Twijykye of the Kyagurilo group, Bwindi-Ruhija

Best regards,

Badru Mugerwa

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One Comment

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