Loading…

Agonistic behavioural asymmetry in two species of montane lizard that exhibit elevational replacement

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 t...

Full description

Saved in:
Bibliographic Details
Published in:Landscape ecology 2021-03, Vol.36 (3), p.863-876
Main Authors: Senior, Anna F., Chapple, David G., Atkins, Zak S., Clemann, Nick, Gardner, Michael G., While, Geoffrey M., Wong, Bob B. M.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0921-2973
1572-9761
DOI:10.1007/s10980-020-01184-5