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POLYPLOIDY CONFERS BETTER COLD TOLERANCE IN DAPHNIA
  • Ivan Pecl,
  • Pierre Blier,
  • France Dufresne
Ivan Pecl
Université du Québec à Rimouski
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Pierre Blier
Université du Québec à Rimouski
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France Dufresne
Université du Québec à Rimouski

Corresponding Author:[email protected]

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Abstract

Despite decades of studies on the differential distribution of polyploid organisms, the causes of this pattern have yet to be elucidated. This study aimed to explore some of the possible physiological mechanisms explaining the differential northern distribution of polyploid clones of Daphnia pulex compared to the one of the diploid parental species. The critical thermal minimum (CTmin) was measured in 17 D. pulex clones of contrasted ploidy (diploid and triploid) and geographic origins (temperate and subarctic climates) reared under low and high temperatures (16 and 24 °C). Triploid clones had better cold tolerance (lower CTmin) than both sympatric and temperate diploid clones. No significant association was found between CTmin and body size nor with cell size. We suggest that triploids might express a cold shock resistant phenotype related to higher gene expression and/or fatty acid profiles. Cold tolerance can be viewed as one of the possible reasons for polyploid preponderance in subarctic climates.
12 Jul 2024Submitted to Oikos
16 Jul 2024Submission Checks Completed
16 Jul 2024Assigned to Editor
16 Jul 2024Review(s) Completed, Editorial Evaluation Pending
25 Jul 2024Reviewer(s) Assigned
17 Aug 2024Editorial Decision: Revise Major
05 Sep 20241st Revision Received
05 Sep 2024Submission Checks Completed
05 Sep 2024Assigned to Editor
05 Sep 2024Review(s) Completed, Editorial Evaluation Pending
18 Sep 2024Reviewer(s) Assigned
18 Oct 2024Editorial Decision: Revise Minor
21 Oct 20242nd Revision Received
21 Oct 2024Submission Checks Completed
21 Oct 2024Assigned to Editor
21 Oct 2024Review(s) Completed, Editorial Evaluation Pending
30 Oct 2024Editorial Decision: Accept