Thermal physiology of native cool-climate,and non-native warm-climate Pumpkinseed sunfish raised in a common environment |
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| Institution: | 1. Environmental and Life Sciences Graduate Program, Trent University, Peterborough, Ontario, Canada K9L 0G2;2. Department of Biology, Trent University, Peterborough, Ontario, Canada K9L 0G2;3. Environmental and Resource Studies Program, Trent University, Peterborough, Ontario, Canada K9L 0G2;1. Department of Biology, University of Arkansas at Little Rock, 2801 S. University Ave., Little Rock, AR 72204, USA;2. Department of Biology, University of Central Arkansas, 201 Donaghey Ave, Conway, AR 72035, USA;1. Department of Animal Science, Faculty of Agronomy and Agricultural Sciences, University of Dschang, Cameroon;2. Department of Animal Biology and Physiology, Faculty of Sciences, University of Yaounde I Cameroon;3. Sezionedi Patologia Veterinaria, Dipartimento di Scienze degli Alimenti, Università degli Studi di Udine, Via Sondrio, 233100 Udine, Italy;1. Department of Cardiothoracic Surgery, Aalborg University Hospital, Hobrovej 18, DK-9000 Aalborg, Denmark;2. Danish Armed Forces, Health Services, Aarhus, Denmark;3. Center for Sensory-Motor Interaction, Aalborg University, Aalborg, Denmark;4. Biomedical Research Laboratory, Aalborg University Hospital, Aalborg, Denmark;5. Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark;1. Marine Ecology Research Centre, School of Environment, Science and Engineering, Southern Cross University, 2480 Lismore, NSW, Australia;2. University Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia |
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| Abstract: | Contemporary evolution of thermal physiology has the potential to help limit the physiological stress associated with rapidly changing thermal environments; however it is unclear if wild populations can respond quickly enough for such changes to be effective. We used native Canadian Pumpkinseed (Lepomis gibbosus) sunfish, and non-native Pumpkinseed introduced into the milder climate of Spain ~100 years ago, to assess genetic differences in thermal physiology in response to the warmer non-native climate. We compared temperature performance reaction norms of two Canadian and two Spanish Pumpkinseed populations born and raised within a common environment. We found that Canadian Pumpkinseed had higher routine metabolic rates when measured at seasonally high temperatures (15 °C in winter, 30 °C in summer), and that Spanish Pumpkinseed had higher critical thermal maxima when acclimated to 30 °C in the summer. Growth rates were not significantly different among populations, however Canadian Pumpkinseed tended to have faster growth at the warmest temperatures measured (32 °C). The observed differences in physiology among Canadian and Spanish populations at the warmest acclimation temperatures are consistent with the introduced populations being better suited to the warmer non-native climate than native populations. The observed differences could be the result of either founder effects, genetic drift, and/or contemporary adaptive evolution in the warmer non-native climate. |
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| Keywords: | Climate change Invasive species Fish Thermal adaptation Countergradient variation |
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