Using dead reckoning to identify fine scale movements of navigating zebra in Botswana, Africa


SOCIETY FOR INTEGRATIVE AND COMPARATIVE BIOLOGY
2021 VIRTUAL ANNUAL MEETING (VAM)
January 3 – Febuary 28, 2021

Meeting Abstract


18-7  Sat Jan 2  Using dead reckoning to identify fine scale movements of navigating zebra in Botswana, Africa Morrell, A*; Bartlam-Brooks, H; Bennitt, E; Webster, J; Wilson, A; Structure and Motion Lab, The Royal Veterinary College, London, UK; Structure and Motion Lab, The Royal Veterinary College, London, UK; Okavango Research Institute, University of Botswana; Centre for Emerging, Endemic and Exotic Diseases, The Royal Veterinary College, London, UK; Structure and Motion Lab, The Royal Veterinary College, London, UK amorrell@rvc.ac.uk

Zebra in the Makgadikgadi Pans National Park (MPNP), Botswana, repeatedly travel between grazing grounds and a single river water source during the dry season (April-October). Trajectories are highly directed and consistently straight, suggesting zebra can orient themselves accurately over 20km from the river and maintain precise position updates throughout their journey. Given the distances and homogeneity of the landscape it is unlikely a single visual or olfactory cue triggers the orientation and tortuosity of the route taken. Obtaining high frequency GPS data to elucidate decision making processes behind subtle changes in orientation, for example, would consume too much power for a wildlife collar to maintain over time. Integrating gyroscope and magnetometer data, known as dead reckoning, can give a more accurate idea of where the animals have travelled but accumulates drift. Combing both 5-minute GPS fixes and dead reckoning data, we demonstrate whether a continuous, drift corrected path can elucidate navigational strategies by identifying fine-scale movements for zebra in the MPNP. These preliminary data, coupled with ongoing analysis, provide crucial insights into how zebra, and potentially other migratory mammals, maintain efficient and precise travel in hostile environments with limited external stimuli, aiding conservation efforts in the MPNP and elsewhere.

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