Directed movement and orientation across a large natural landscape by zebras, Equus burchelli antiquorum
Section snippets
Movement Data
We fitted nine adult zebra mares with either Televilt Posrec (N = 5) or Televilt Simplex (N = 4) GPS collars (Televilt/TVP Positioning AB, Lindesberg, Sweden; Brooks et al. 2008). Mares were collared in preference to stallions to reduce the risk of collar damage during intrasex fighting and selected at random from across the population to ensure they were from different harems. They were darted from a helicopter by an experienced wildlife veterinarian, using the tranquilliser etorphine
Directed Movement
Individual zebras had different spatial foraging strategies. Seven followed directed paths, with a positive CRWdiff (scaling test for oriented movement: P < 0.014) along the lower to medium spatial scale ranges (Table 1), signifying directed movement at these spatial scales. The remaining two zebras (552 and 530) foraged out from the centralized waterholes along a path not significantly different to a CRW, across all but the largest spatial scales. In both groups of zebras, those that followed
Discussion
We identified individually distinct, scalar-sensitive movement patterns by zebras. Seven of the nine zebras we observed over the course of a dry season followed a directed movement path while walking out from the centrally located waterholes towards their selected foraging patch. The use of directed movement implies that zebras had a well-defined spatial awareness of patch location, preferentially selecting a patch and orienting their movement by walking directly towards it (Howery et al. 1999
Acknowledgments
We thank the Department of Wildlife and National Parks, Botswana for research permits and technical support, the Dulverton Trust, the Rufford Foundation, the Walt Disney Company Foundation, Columbus Zoo, San Antonio Zoo, the Gilchrist Educational Trust and Ken Moore for funding, L. Patterson for undertaking the veterinary procedures required for this study and two anonymous referees for their helpful comments.
References (52)
Daily selection of feeding areas by cattle in homogeneous and heterogeneous environments
Applied Animal Behaviour Science
(1995)- et al.
Hummingbird foraging behavior in different patch types: simulation of alternative strategies
Ecological Modelling
(2001) How to reliably estimate the tortuosity of an animal's path: straightness, sinuosity, or fractal dimension?
Journal of Theoretical Biology
(2004)- et al.
Spatial analysis of animals' movements using a correlated random walk model
Journal of Theoretical Biology
(1988) - et al.
The use of spatial memory by grazing animals to locate food patches in spatially heterogeneous environments: an example with sheep
Applied Animal Behaviour Science
(1996) - et al.
Use of cues by grazing animals to locate food patches: an example with sheep
Applied Animal Behaviour Science
(1997) - et al.
Significance of memory properties in prey choice decisions
Ecological Modelling
(1999) - et al.
Cattle use visual cues to track food locations
Applied Animal Behaviour Science
(2000) - et al.
The form and consequence of random walk movement models
Journal of Theoretical Biology
(1988) Detecting oriented movement of animals
Animal Behaviour
(2006)
Producers and Scroungers: Strategies of Exploitation and Parasitism
Circular Statistics in Biology
An analysis of movements of the wood mouse Apodemus sylvaticus in its home range
Behavioural Processes
Caribou movement as a correlated random walk
Oecologia
Ungulate foraging strategies: energy maximizing or time minimizing?
Journal of Animal Ecology
Effects of global positioning system collar weight on zebra behavior and location error
Journal of Wildlife Management
Random search by herbivorous insects: a simulation model
Ecology
Fractal analysis can explain individual variation in dispersal search paths
Ecology
Determinants of the use of habitat by horses in a Mediterranean wetland
Journal of Animal Ecology
The capture of plains zebra Equus burchelli antiquorum (H. Smith 1941) with M-99 (Reckitt) and tranquilizers in the Etosha National Park
Madoqua
Effects of the scale and spatial distribution of the food resource and animal state on diet selection: an example with sheep
Journal of Animal Ecology
Understanding GIS, the ARC/INFO Method
Using first-passage time in the analysis of area-restricted search and habitat selection
Ecology
Do ungulates exhibit a food density threshold? A field study of optimal foraging and movement patterns
Journal of Animal Ecology
Searching behavior and use of sampling information by free-ranging bison (Bos bison)
Behavioral Ecology and Sociobiology
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S. Harris is at the School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, U.K.