Abstract
Understanding how species have responded to strong climatic fluctuations accompanying glacial-interglacial cycles is critical to predicting their likely responses to future climate change, and therefore can help guide conservation strategies. Using molecular phylogeography and ecological niche modelling, we aimed to understand how a newly recognized cryptic montane mammal (Spermophilus taurensis, Taurus ground squirrels) has responded to global climate changes through the Late Quaternary glacial-interglacial cycles as a means to better predict their likely responses to future climate change. Accordingly, 51 cytochrome b mitochondrial DNA sequences from throughout the known distribution of Taurus ground squirrels were used to investigate the intraspecific diversification. Besides molecular phylogeography, ecological niche modelling was also employed to get insights into possible climate-driven altitudinal range shifts in the past (the Last Glacial Maximum, 22 kya and the Mid-Holocene, 6 kya) and in the future (2050). Taurus ground squirrels survived the Late Quaternary glacial-interglacial cycles by altitudinal migrations without large geographical displacements. As warming occurred from the Last Glacial Maximum to the Mid-Holocene to the present, the potential distribution of Taurus ground squirrels shifted towards higher altitudes, resulting in a smaller range in the present. As warming continues, the potential distribution of Taurus ground squirrels will continue to shift towards higher altitudes, resulting in a much smaller range in the future. Particular sources of concern are the synergistic effects of future climate change and anthropogenic impacts on Taurus ground squirrels and their montane environments.
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Acknowledgments
We would like to thank M. Çakır, M. Çelik, H. Sevgili, and H. Yılmaz for sharing their field observations. This study was supported by the Ahi Evran University Scientific Research Projects Coordination Unit (Project Number: PYO-FEN.4001.15.008).
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U.P. conducted laboratory studies; H.G. conducted ecological niche modelling analyses; H.G and U.P. conducted molecular phylogeography analyses; H.G, U.P., and M.K.G. contributed to the interpretations of the results; and H.G. prepared and edited the manuscript, with input from all authors.
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Communicated by: Jan M. Wójcik
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S1 Figure
Marginal response curves of the bioclimatic variables (winter temperature and precipitation) that most contributed to the model. (GIF 49 kb)
S2 Figure
Bioclimatic niches of the northern and southern lineages (green and yellow, respectively). (GIF 53 kb)
S3 Figure
The posterior estimates of the parameters of theta (A), migration rate (B), and time to divergence (C) between the northern and southern populations. (GIF 35 kb)
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Gür, H., Perktaş, U. & Gür, M.K. Do climate-driven altitudinal range shifts explain the intraspecific diversification of a narrow ranging montane mammal, Taurus ground squirrels?. Mamm Res 63, 197–211 (2018). https://doi.org/10.1007/s13364-017-0347-8
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DOI: https://doi.org/10.1007/s13364-017-0347-8
Keywords
- Ecological niche modelling
- Molecular phylogeography
- Quaternary glacial-interglacial cycles
- Range shifts
- Spermophilus taurensis