Variation in thermal tolerance of North American ants |
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| Institution: | 1. Texas Tech University MS 42125, Lubbock, TX 79409, USA;2. University of Louisville, 139 Life Sciences Building, Louisville, KY 40292, USA;3. University of Central Arkansas, 201 Donaghey Ave., LSC 180, Conway, AR 72035, USA;1. Institute of Geography, Department of Soil Sciences, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany;2. Max Planck Institute for Biogeochemistry, Hans-Knöll-Str. 10, 07745 Jena, Germany;1. Department of Biology, Section of Ecology, University of Turku, FI-20014 Turku, Finland;2. Centre for Economic Development, Transport and the Environment, P.O. Box 523, FI-20800 Turku, Finland;3. Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland;1. Institute of Geography, Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany;2. Max Planck Institute for Biogeochemistry, Hans-Knöll-Str. 10, 07745 Jena, Germany;3. Tropical Ecosystems Research Centre, CSIRO Land & Water, PMB 44 Winnellie, NT 0822, Australia;4. Research Institute for the Environment & Livelihoods, Charles Darwin University, Darwin, NT 0909, Australia;5. Institute of Mathematics, Friedrich Schiller University Jena, Ernst-Abbe-Platz 2, 07743 Jena, Germany |
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| Abstract: | Changing climates are predicted to alter the distribution of thermal niches. Small ectotherms such as ants may be particularly vulnerable to heat injury and death. We quantified the critical thermal maxima of 92 ant colonies representing 14 common temperate ant species. The mean CTmax for all measured ants was 47.8 °C (±0.27; range=40.2–51.2 °C), and within-colony variation was lower than among-colony variation. Critical thermal maxima differed among species and were negatively correlated with body size. Results of this study illustrate the importance of accounting for mass, among and within colony variation, and interspecific differences in diel activity patterns, which are often neglected in studies of ant thermal physiology. |
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| Keywords: | Formicidae Critical thermal maximum Arkansas Texas Heat Insects |
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