Using global-positioning system data corresponding to the movements of elephants across the African savannah, researchers have found that elephants exhibit strong tendencies to avoid significantly sloped terrain, and that such land features likely represent a key influence on elephant movements and land use. On the basis of calculations of energy use associated with traversing sloped terrain by such large animals, the researchers found that this behavior is likely related to the fact that even minor hills represent a considerable energy barrier for elephants because of the added calorie consumption required for such movements. The findings are reported by Fritz Vollrath of the University of Oxford and elephant experts Jake Wall and Iain Douglas-Hamilton of Save the Elephants, and appear in the July 25th issue of Current Biology, published by Cell Press.
Understanding the factors that determine locations of elephant density hot-spots and use corridors is critical in helping to secure safe niches for elephants in the face of growing human encroachment on elephants' native habitat. In their study of elephant movements, the authors focused on the Samburu/Isiolo/Laikipia districts in northern Kenya, which represent an area of about 32,000 square kilometers of mostly unprotected habitat. This range is home to about 5,400 elephants.
In the course of studying the influences of a range of environmental factors on elephant movement, the authors found that elephant density dropped off significantly with increasing hill slopes. While this effect may well involve such factors as risks of injury and overheating, or lack of water, the authors' calculations of the energy required for elephants to traverse sloped terrain indicate that the energetic costs of such movement could be a main factor influencing this behavioral tendency. For example, the authors calculate that climbing 100 meters would "burn" energy that would take an extra half hour of foraging to
Contact: Heidi Hardman