January 27, 2011
An interview with Ian Craigie.
"We weren’t surprised that populations had dropped but we were surprised by how large the drops had been," lead author Ian Craigie told mongabay.com in an interview.
African buffalo in Maasai Mara park in Kenya. Photo by: Rhett A. Butler.
"In Africa man has successfully lived alongside large populations of wild animals for millennia but the advent of advanced technology and agriculture has lead to a 5-fold increase in African human populations since World War 2. All these extra humans are using and moving into previously natural habitats and squeezing out the wildlife," he says.
The study looked at three general regions across Africa: Southern African, East Africa, and West Africa. Wildlife in Southern African parks fared the best according to Craigie because "the level of funding for parks in Southern Africa is much greater than other regions" and the region has lower population densities. West Africa's parks came in last due to a culture of bushmeat hunting, poverty, and booming human populations.
The overall decline of African mammals is likely to be worse than even the study portrays for two reasons: mammal populations have almost certainly suffered worse outside of parks than inside, and Craigie and his team were not able to include parks that didn't regularly survey their wildlife populations.
Lioness with wildebeest kill in Tanzania. Photo by: Rhett A. Butler.
In a January 2011 interview Dr. Ian Craigie discussed the state of mammal populations in parks across Africa, and how this loss impacts both the native ecosystems and the African people.
INTERVIEW WITH IAN CRAIGIE
Mongabay: What is your background?
Ian Craigie: I have just completed my PhD at the University of Cambridge and Institute of Zoology, London. I started the PhD having previously done a Masters at Imperial College London in 2006 and working for South African National Parks in 2004/2005.
AFRICAN MAMMAL DECLINES
Mongabay: Your study found that on average large mammal populations have dropped by 59 percent in Africa's protected areas. Were you surprised by these findings?
Common eland in Zimbabwe. Photo by: Tiffany Roufs.
Mongabay: Why do you think this might even underestimate total declines?
Ian Craigie:We were only able to obtain data from parks that count their animals regularly. The parks left out of this study, where animals were not counted, are likely to be those which are financially poorer or less well managed. So the large declines we found were from the best parks, if we were able to include the other parks the results may have been even worse.
Mongabay: How could these declines be affecting the overall ecosystem?
Ian Craigie:The declines we found were mostly in herbivores such as wildebeest and impala. These species modify their environment through grazing which is an essential process in the ecosystem. Grazing drives the nutrient cycle, it controls the number and severity of fires and it even dictates whether habitats are grassland or woodland. Large declines in the number of grazers can lead to substantial changes in biodiversity and habitat structure.
Mongabay: Even though there's not enough data to do a similar study of mammal populations outside of protected areas, what's your sense of how mammals are doing there?
Wildebeest and a male impala in the Okavango Delta in Botswana. Photo by: Tiffany Roufs.
Mongabay: What are the likely causes behind this decline?
Ian Craigie:There are multiple causes but they are all ultimately driven by mankind. Hunting and habitat damage through agricultural expansion are the two main culprits.
Mongabay: What role do you think population growth could be playing in the decline?
Ian Craigie:Human population growth underlies these declines by increasing the pressure that mankind puts on the environment. In Africa man has successfully lived alongside large populations of wild animals for millennia but the advent of advanced technology and agriculture has lead to a 5-fold increase in African human populations since WW2. All these extra humans are using and moving into previously natural habitats and squeezing out the wildlife.
Mongabay: Is there any evidence of climate change impacting mammals negatively, for example, with the extended drought in Kenya last year?
Elephants at the Chobe River in Botswana. Photo by: Tiffany Roufs.
Mongabay: Southern African mammals are doing better than East and West African. What is southern Africa doing right?
Ian Craigie:The level of funding for parks in Southern Africa is much greater than other regions of the continent and also there are generally lower human population densities.
Mongabay: West African mammals are the worse off of the three regions. What particular issues are mammals in West Africa facing?
Ian Craigie:West Africa still has a strong tradition of hunting for bushmeat, generally the countries in the region are poorer than the average for Africa and there are also high human population densities putting extra pressure on the natural resources.
Mongabay: What suggestions would you make in countering this decline or should we resign ourselves to a less wild Africa?
Ian Craigie:There is no doubt the patterns we have shown here can be reversed, the wildlife populations can recover if we reduce the threats they are facing, however it will require some serious investment and political will to achieve.
Mongabay: How would you like policymakers to view your study?
Hippos in the Okavango Delta in Botswana. Photo by: Tiffany Roufs.
Mongabay: Why should the average African care about mammal populations falling?
Ian Craigie:Maintaining wildlife populations is important for maintaining tourist spending which is a major source of income for a number of African countries. The large mammal populations also perform a number of important natural functions and if these become disrupted it is hard to predict how the ecosystems will react. If ecosystems become disturbed this will in turn disrupt ecosystem services such as pollination or clean water provision which may directly affect local human populations.
Mongabay: What do your findings say about the capacity of protected areas worldwide to preserve biodiversity?
Ian Craigie:It is hard to generalise these results to other parts of the world, Africa is special in having large areas of savannah with millions of large mammals roaming around. In other areas that are forested or mountainous or have very different species there are likely to be quite different patterns of threats and species responses, and so parks are likely to vary in their performance a great deal.
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