Elephant (Loxodonta africana) GPS collar data show multiple peaks of occurrence farther from water sources

• Main Authors: Henry Ndaimani, Amon Murwira, Mhosisi Masocha, Fadzai M. Zengeya
• Format: Article
• Language: English
• Published: Taylor & Francis Group 2017-01-01
• Series: Cogent Environmental Science
• Subjects: area under curve; maxent; normalised difference vegetation index; piosphere; receiver operating characteristic curve
• Online Access: http://dx.doi.org/10.1080/23311843.2017.1420364

The understanding of animal distribution in habitats located farther from water sources has not been dealt with adequately in the literature, yet this knowledge enables better prediction of species occurrence across an entire landscape. We tested whether elephant occurrence peaks away from water in addition to the known peak that is associated with water sources. We used the Maximum Entropy Modelling (MaxEnt) algorithm to predict the potential distribution of elephants in the Gonarezhou National Park, Zimbabwe. Elephant tracking data from Global Positioning System (GPS) collars were used as the response variable while NDVI (a proxy for forage quantity) and water sources data were the environmental variables. Results showed multiple peaks of elephant occurrence with increasing distance from water sources. Additionally, results illustrated that the peaks occur in high NDVI areas. Our findings emphasise the utility of GIS and remote sensing in enhancing our understanding of animal occurrence driven by water sources.