Time course of acclimation of critical thermal limits in two springtail species (Collembola)


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Kuyucu A. C., Chown S. L.

Journal Of Insect Physiology, vol.130, pp.1-8, 2021 (SCI-Expanded)

  • Publication Type: Article / Article
  • Volume: 130
  • Publication Date: 2021
  • Doi Number: 10.1016/j.jinsphys.2021.104209
  • Journal Name: Journal Of Insect Physiology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Animal Behavior Abstracts, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, BIOSIS, CAB Abstracts, Chemical Abstracts Core, EMBASE, MEDLINE, Veterinary Science Database
  • Page Numbers: pp.1-8
  • Hacettepe University Affiliated: Yes

Abstract

Critical thermal limits are one of the most important sources of information on the possible impacts of climate
change on soil microarthropods. The extent of plasticity of tolerance limits can provide valuable insights about
the likely responses of ectotherms to environmental change. Although many studies have investigated various
aspects of the acclimatory response of thermal limits to temperature changes in arthropods, the number of studies
focusing on the temporal dynamics of this plastic response is relatively small. Collembola, one of the key
microarthropods groups in almost all soil ecosystems around the world, have been the focus of several thermal
acclimation studies. Yet the time course of acclimation and its reversal have not been widely studied in this
group. Here we investigated the time course of acclimation of critical thermal maxima (
CTmax) and minima
(
CTmin) of two springtail species. We exposed a Cryptopygus species from temperate southern Australia to high
and low temperature conditions and
Mucrosomia caeca from Sub-Antarctic Macquarie Island to high temperature
conditions
. Upper thermal limits in both species were found to be highly constrained, as CTmax did not show
substantial response to high and low temperature acclimation both in the
Cryptopygus species and M. caeca,
whereas
CTmin showed signifcant responses to high and low temperature conditions. The acclimation begins to
stabilize in approximately seven days in all treatments except for the acclimation of
CTmin under high temperature conditions, where the pattern of change suggests that this acclimation might take longer to be completed.
Although reversal of this acclimation also begins to stabilize under 7 days, re-acclimation was relatively slow as
we did not observe a very clear settling point in 2 of the 3 re-acclimation treatments. The observed limits on the
plasticity of
CTmax indicate that both of these species may be very limited in their ability to respond plastically to
short-term rapid changes in temperature (i.e temperature extremes).