Quick Summary
- A sixth of wildlife corridors in Tanzania have been separated by land conversion
- Study identifies 52 potential wildlife corridors 鈥 23 more than previously estimated
- Study combined interviews with local residents with models to map new wildlife corridors
Researchers at the University of California, Davis, have identified 52 potential wildlife corridors linking protected areas across Tanzania. Using a cost-effective combination of interviews with local residents and a land conversion dataset for East Africa, they found an additional 23 corridors over those previously identified by Tanzanian government reports.
According to in the journal PLOS ONE, nearly a sixth of all the wildlife corridors previously identified in Tanzania in 2009 potentially have been separated by land conversion, and a third now pass across lands likely to be converted to human use in the near future.
The results show that structural wildlife corridors still connect protected areas from east to west across the nation to some degree. But no open wildlife corridors remain to link protected areas between northern and southern Tanzania, and two reserves 鈥 Gombe Stream National Park and Pande Game Reserve 鈥 are completely isolated from all others in the country.
Crucial stepping-stones
The study uncovered two reserves with lower forms of protection, Uvinza Forest Reserve in the west and Wami-Mbiki Wildlife Management Area in the east, that act as apparently crucial stepping-stones between national parks and game reserves and should be prioritized for conservation attention.
鈥淲hile most people will never have heard of these small reserves, they are absolutely vital for linking larger parks,鈥 said lead author Jason Riggio, a 新澳门六合彩内幕信息 Davis graduate student in the Department of Wildlife, Fish and Conservation Biology.
Globally, land conversion and habitat degradation are driving wildlife losses, so populations are increasingly restricted to reserves isolated by agriculture and urbanization. Wildlife populations that lack connectivity to other protected areas can quickly suffer from inbreeding and reduced opportunities for range shifts tracking global climate change.
鈥淭he long-term viability of wildlife species relies on maintaining connectivity between protected areas,鈥 Riggio said. 鈥淟arge-scale conservation corridors can serve as essential linkages between habitats.鈥
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Finding wildlife corridors
There are several ways to identify wildlife corridors. One method is to ask reserve managers and wildlife researchers where corridors exist. This can be an accurate and cost-effective method in places where people live or work, but may miss corridors where people simply are not looking.
Another way is to use GPS and/or VHF-collars fitted to animals. This is often cost-prohibitive and limited to local or regional scales. The study鈥檚 researchers note that as connectivity between protected areas rapidly erodes, novel methods must be developed quickly and cheaply to assess where wildlife corridors still exist.
鈥淚nterviews with people living within or adjacent to wildlife corridors can provide accurate information on wildlife movements that can be obtained fairly easily,鈥 said Tim Caro, co-author on the paper and a professor in the 新澳门六合彩内幕信息 Davis Department of Wildlife, Fish and Conservation Biology. 鈥淭hese data can then be used to validate connectivity models.鈥
Tanzania an ideal test case
Tanzania is an ideal country to test methods for delineating wildlife corridors, because it is the only country in Africa to have assessed its wildlife corridors at the national scale. The researchers compared the output of 60 corridor models to their interview data about known wildlife movements in eastern Tanzania to determine which model most accurately captured connectivity between protected areas across the country.
The findings indicate that there might be a far greater potential for large mammals to move between protected areas in Tanzania than was previously supposed. But more research is required to know whether or not mammals use these corridors.
A key remaining question is which large mammal species move through agricultural areas or, more specifically, which species traverse which sorts of converted land and over what distances.
鈥淥ur method of modeling landscape connectivity using spatial data on anthropogenic land conversion, combined with interviews to validate these models is readily applicable to other regions,鈥 said Caro. 鈥淲e need to identify wildlife corridors very rapidly before they disappear.鈥
The research was funded by the American Philosophical Society, American Society of Mammalogists, Explorers Club, and 新澳门六合彩内幕信息 Davis.
Media Resources
Kat Kerlin, 新澳门六合彩内幕信息 Davis News and Media Relations, 530-750-9195, kekerlin@ucdavis.edu
Jason Riggio, 新澳门六合彩内幕信息 Davis Wildlife, Fish and Conservation Biology, 201-819-2202, jsriggio@ucdavis.edu