Humans are rapidly altering thermal landscapes, so a central challenge to organismal ecologists is to better understand the thermal niches of ectotherms. However, there is much disagreement over how we should go about this. Some ecologists assume that a statistical model of abundance as a function of habitat temperature provides a sufficient approximation of the thermal niche, but ecophysiologists have shown that the relationship between fitness and temperature can be complicated, and have stressed the need to elucidate the causal mechanisms underlying the response of species to thermal change. Towards this end, we studied the distribution of two crayfishes, Euastacus woiwuru and Euastacus armatus, along an altitudinal gradient, and for both species conducted experiments to determine the temperature-dependence of: (1) aerobic scope (the difference between maximum and basal metabolic rate; purported to be a proxy of the thermal niche); and (2) burst locomotor performance (primarily fuelled using anaerobic pathways). E. woiwuru occupied cooler habitats than E. armatus, but we found no difference in aerobic scope between these species. In contrast, locomotor performance curves differed significantly and strongly between species, with peak locomotor performances of E. woiwuru and E. armatus occurring at ~10 and ~18 °C, respectively. Crayfish from different thermal landscapes may have similar aerobic thermal performance curves but different anaerobic thermal performance curves. Our results support a growing body of literature implying different components of ectotherm fitness have different thermal performance curves, and further challenge our understanding of the ecology and evolution of thermal niches.
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We thank John Morrongiello and Slade Allen-Ankins for their reviews of earlier drafts. Leon Barmuta and an anonymous reviewer provided extensive feedback that improved the paper. We thank Kyle Weatherman, Glenn Miller and Rachel Press for assistance in the lab. Susan Lawler provided great insight on the natural history of Euastacus. This work was carried out under VIC Fisheries Permits 2010-23NC and National Parks Permit 10005630. This work was partly funded by the CSIRO Land and Water Flagship, the Murray-Darling Freshwater Research Centre and the Goulburn-Broken Catchment Management Authority.
Author contribution statement
R. J. S. conceived and designed the study. A. J. R., M. T. V., S. P. C. and R. J. S. carried out field surveys, temperature logging and experiments. W. J. M. and R. J. S. analysed the data. R. J. S. wrote the paper; other authors provided editorial advice.
Conflict of interest
The authors declare they have no conflict of interest.
All applicable institutional and/or national guidelines for the care and use of animals were followed. This work was carried out under La Trobe University Ethics permits AEC-09-50W, AEC-12-07, and AEC-10-55.
Communicated by Leon A. Barmuta.
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Stoffels, R.J., Richardson, A.J., Vogel, M.T. et al. What do metabolic rates tell us about thermal niches? Mechanisms driving crayfish distributions along an altitudinal gradient. Oecologia 180, 45–54 (2016). https://doi.org/10.1007/s00442-015-3463-7
- Climate change
- Community ecology
- Functional traits
- Metabolic ecology