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Wing Pigmentation Affects Thermal Response in Two Sexually Dimorphic Calopteryx (Odonata)
  • Gretchen Schreiner,
  • Lucie Duffy,
  • Jonathan Brown
Gretchen Schreiner
Grinnell College
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Lucie Duffy
Grinnell College
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Jonathan Brown
Grinnell College
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Peer review status:UNDER REVIEW

06 Jun 2020Submitted to Ecology and Evolution
08 Jun 2020Submission Checks Completed
08 Jun 2020Assigned to Editor
11 Jun 2020Reviewer(s) Assigned
24 Jun 2020Review(s) Completed, Editorial Evaluation Pending
07 Jul 2020Editorial Decision: Revise Minor
13 Jul 20201st Revision Received
14 Jul 2020Submission Checks Completed
14 Jul 2020Assigned to Editor
14 Jul 2020Review(s) Completed, Editorial Evaluation Pending
27 Jul 2020Reviewer(s) Assigned

Abstract

1. Organisms may internally or behaviourally regulate their body temperatures or conform to the ambient air temperatures. Previous studies are inconclusive on whether pigmentation influences thermoregulation in various odonates. 2. We investigated the thermal response of sympatric North American Calopteryx aequabilis and Calopteryx maculata with a thermal imaging study across a 25 °C ambient temperature range. 3. We found that regressions of thorax temperature on ambient temperature had similar slopes for male and female C. maculata, but females were consistently 1.5 °C warmer than males. 4. In contrast, the sexes of C. aequabilis differed in slope, with C. aequabilis females having a slope less than 1.0 and males having a slope greater than 1.0. 5. Given that C. aequabilis is strongly sexually dimorphic in pigment, but C. maculata is not, our findings suggest that pigmentation does influence thermal response rate in sympatric populations of both species.