Abstract
Context
In montane systems, closely related species tend to segregate spatially along elevational gradients. The role of biotic interactions, relative to species physiological requirements, in maintaining these distribution patterns is an important question in spatial ecology. Theory suggests that the role of interspecific competition can be significant in the maintenance of elevation replacement distributions. Despite this, there has been limited work investigating factors beyond thermophysiology in determining ranges in temperate montane species.
Objectives and methods
We investigated agonistic (i.e. aggressive) behaviour in response to a simulated intruder (conspecific versus heterospecific 3D printed models) in two sister species of temperate montane lizard, Liopholis guthega and L. montana, from south-eastern Australia. The two species have similar thermal tolerances at an area of distributional overlap between 1600 and 1700 m above sea level, above which L. montana is replaced by the high elevation specialist L. guthega.
Results
We found that response to intruder stimuli differed between the two species, with the high elevation L. guthega actively biting both conspecific and heterospecific models, whereas the lower elevation L. montana, never attacked either model type. Our findings provide evidence of asymmetric agonistic response in the two montane reptile species.
Conclusions
These findings have important implications for understanding how biological interactions and behaviour, in addition to thermo-physiological data, might mediate landscape scale distribution patterns both now and as environments change in the future. More broadly, our results are not consistent with the widespread idea that low elevation species will inevitably ‘push’ higher elevation species out, as global warming erodes species’ thermal envelopes.
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Data availability
Data will be deposited on Figshare upon acceptance of the manuscript.
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Acknowledgements
We acknowledge First Nations Australians of the Ngarigo and Wurundjeri, upon whose land this research was undertaken. For logistical support we thank Justin Adams, Laura Cook, Kaspar Delhey, Emily Drummond, Marie Fan, Mark Feeney, Katelyn Hamilton, Rob Hayes, Carolyn Kovach, Topi Lehtonen, Chantel McCubbin, Matt McCurry, Alex McQueen, Jane Melville, Michelle Quayle, Mellesa Schroder, Chris Senior, and Brook Sykes. Special thanks to George Madani and Lachlan Hall for their photographs. This work was supported by the Holsworth Research Endowment (grant awarded to AFS), and an Australian Research Council Discovery Project Grant (DP150102900, grant to DGC, MMG and GMW).
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AFS carried out fieldwork, lab experiments and data analysis, contributed to the design of the study and wrote the manuscript. BBMW, DGC, NC and ZSA contributed to the design of the study and drafting of the manuscript. MGG and GMW contributed to the drafting of the manuscript. All authors gave final approval for publication.
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Research was conducted in accordance with appropriate collection and research permits (New South Wales: SL101798) and was approved by the Monash University animal welfare committee (BSCI/2016/24).
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Senior, A.F., Chapple, D.G., Atkins, Z.S. et al. Agonistic behavioural asymmetry in two species of montane lizard that exhibit elevational replacement. Landscape Ecol 36, 863–876 (2021). https://doi.org/10.1007/s10980-020-01184-5
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DOI: https://doi.org/10.1007/s10980-020-01184-5