Population status and distribution modelling of the critically endangered riverine rabbit (Bunolagus monticularis) |
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| Authors: | Kai Collins Johan T du Toit |
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| Affiliation: | 1. Mammal Research Institute, Department of Zoology & Entomology, University of Pretoria, Pretoria, South Africa;2. Department of Wildland Resources, Utah State University, Logan, UT, USA |
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| Abstract: | The riverine rabbit (Bunolagus monticularis) is one of the most endangered mammals in the world due to fragmentation of its habitat in the semi‐arid Karoo region of South Africa, to which it is endemic. It is an umbrella conservation species for the riparian shrubland associated with the seasonal drainage system of the Karoo, where its presence is an indicator of ecosystem health. In this study, we analysed historical survey data to derive an improved assessment of the current B. monticularis population status and distribution. Geospatial analysis was conducted using geographical information systems, and distribution modelling was performed using Maxent. Extent of occurrence for the species is 54,227 km2, and area of occupancy is 2943 km2. Estimates of 157–207 mature individuals confirm an alarmingly small species population size, and it appears that no subpopulation has >50 mature individuals. Our findings thus support the continued classification of this species as ‘critically endangered’ under IUCN Red List criteria. However, with most remaining habitat occurring outside of protected areas, and with habitat loss being exacerbated by climate change, a viable conservation plan remains elusive. |
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| Keywords: | climate change endemic lagomorph Karoo Maxent modelling rare mammal |
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