Abstract
Five species of mouse or forest shrews (Myosorex) are endemic to South Africa, Lesotho and Swaziland, four of which (Myosorex varius, Myosorex cafer, Myosorex longicaudatus and Myosorex cf. tenuis) are associated with montane or temperate grassland, fynbos and/or forest habitats while a fifth (Myosorex sclateri) is associated with lowland subtropical forests. Due to their small size, specialised habitat, low dispersal capacity, high metabolism and sensitivity to temperature extremes, we predicted that, particularly for montane species, future climate change should have a negative impact on area of occupancy (AOO) and ultimately extinction risks. Species distribution models (SDMs) indicated general declines in AOO of three species by 2050 under the A1b and A2 climate change scenarios (M. cafer, M. varius, M. longicaudatus) while two species (M. sclateri and M. cf. tenuis) remained unchanged (assuming no dispersal) or increased their AOO (assuming dispersal). While temperate species such as M. varius appear to be limited by temperature maxima (preferring cooler temperatures), the subtropical species M. sclateri appears to be limited by temperature minima (preferring warmer temperatures). Evidence for declines in AOO informed the uplisting (to a higher category of threat) of the Red List status of four Myosorex species to either vulnerable or endangered as part of a separate regional International Union for Conservation of Nature (IUCN) Red List assessment.
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Acknowledgments
This paper is dedicated to our colleague, the late Roderick M. Baxter, who passed away tragically during the writing of this paper. PJT acknowledges the financial support of the University of Venda, the National Research Foundation and the Department of Science and Technology under the South African Research Chair Initiative (SARChI) on Biodiversity Value and Change within the Vhembe Biosphere Reserve hosted at University of Venda and co-hosted by the Centre for Invasion Biology at University of Stellenbosch. Mark Robertson provided very valuable advice on MaxEnt modelling aspects.
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Supplementary Fig. 1
(Maps of South Africa showing the distribution of maximum temperatures of the warmest month (Bioclim variable 5) based on current data (a) and predicted for 2050 (b), overlaid with the distribution range of M. varius (crosses). DOCX 417 kb)
Supplementary Fig. 2
(Maps of South Africa showing the distribution of precipitation of the wettest month (Bioclim variable 13) based on current data (a) and predicted for 2050 (b), overlaid with the distribution range of M. cf. tenuis (red filled squares). DOCX 259 kb)
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Taylor, P.J., Ogony, L., Ogola, J. et al. South African mouse shrews (Myosorex) feel the heat: using species distribution models (SDMs) and IUCN Red List criteria to flag extinction risks due to climate change. Mamm Res 62, 149–162 (2017). https://doi.org/10.1007/s13364-016-0291-z
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DOI: https://doi.org/10.1007/s13364-016-0291-z