, Volume 188, Issue 2, pp 333–342 | Cite as

Is thermal limitation the primary driver of elevational distributions? Not for montane rainforest ants in the Australian Wet Tropics

  • Somayeh NowrouziEmail author
  • Alan N. Andersen
  • Tom R. Bishop
  • Simon K. A. Robson
Highlighted Student Research


Terrestrial ectotherms are likely to be especially sensitive to rising temperatures over coming decades. Thermal limits are used to measure climatic tolerances that potentially affect ectotherm distribution. While there is a strong relationship between the critical thermal maximum (CTmax) of insects and their latitudinal ranges, the nature of this relationship across elevation is less clear. Here we investigated the combined relationships between CTmax, elevation and ant body mass, given that CTmax can also be influenced by body mass, in the World Heritage-listed rainforests of the Australian Wet Tropics. We measured the CTmax and body mass of 20 ant species across an elevational gradient from 350 to 1000 m a.s.l. Community CTmax did not vary systematically with increasing elevation and there was no correlation between elevation and elevational ranges of species. However, body mass significantly decreased at higher elevations. Despite the negative correlation between CTmax and body mass at the community level, there was no significant difference in CTmax of different-sized ants within a species. These findings are not consistent with either the climatic variability hypothesis, Rapoport’s rule or Bergmann’s rule. Models indicated that elevation and body mass had limited influences on CTmax. Our results suggest that the distribution of most montane ants in the region is not strongly driven by thermal limitation, and climate change will likely impact ant species differently. This is likely to occur primarily through changes in rainfall via its effects on vegetation structure and therefore thermal microhabitats, rather than through direct temperature changes.


Body size Climate change CTmax Ectotherm Elevation gradient 



Dr. Kyran Staunton provided valuable comments on the manuscript, which we are grateful for. SN was supported by a Ph.D. scholarship from the National Environmental Research Program of Australian Government (James Cook University).

Author contribution statement

SN, ANA, SKAR conceived the ideas; SN collected the data; SN and TRB analysed the data; SN led the writing, with other authors also contributing.

Supplementary material

442_2018_4154_MOESM1_ESM.docx (65 kb)
Supplementary material 1 (DOCX 64 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Centre for Tropical Biodiversity and Climate Change, College of Science and EngineeringJames Cook UniversityTownsvilleAustralia
  2. 2.CSIRO Land and Water FlagshipDarwinAustralia
  3. 3.Research Institute for the Environment and LivelihoodsCharles Darwin UniversityDarwinAustralia
  4. 4.Department of Zoology and Entomology, Centre for Invasion BiologyUniversity of PretoriaPretoriaSouth Africa

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