Rapid evolution of unimodal but not of linear thermal performance curves in Daphnia magna

Wang, Ying-Jie ORCID: https://orcid.org/0000-0001-9091-6423; Tüzün, Nedim ORCID: https://orcid.org/0000-0002-4743-1743; De Meester, Luc ORCID: https://orcid.org/0000-0001-5433-6843; Feuchtmayr, Heidrun ORCID: https://orcid.org/0000-0002-2028-4843; Sentis, Arnaud ORCID: https://orcid.org/0000-0003-4617-3620; Stoks, Robby ORCID: https://orcid.org/0000-0003-4130-0459. 2023 Rapid evolution of unimodal but not of linear thermal performance curves in Daphnia magna. Proceedings of the Royal Society B: Biological Sciences, 290 (1990), 20222289. 9, pp. https://doi.org/10.1098/rspb.2022.2289

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Abstract/Summary

Species may cope with warming through both rapid evolutionary and plastic responses. While thermal performance curves (TPCs), reflecting thermal plasticity, are considered powerful tools to understand the impact of warming on ectotherms, their rapid evolution has been rarely studied for multiple traits. We capitalized on a 2-year experimental evolution trial in outdoor mesocosms that were kept at ambient temperatures or heated 4°C above ambient, by testing in a follow-up common-garden experiment, for rapid evolution of the TPCs for multiple key traits of the water flea Daphnia magna. The heat-selected Daphnia showed evolutionary shifts of the unimodal TPCs for survival, fecundity at first clutch and intrinsic population growth rate toward higher optimum temperatures, and a less pronounced downward curvature indicating a better ability to keep fitness high across a range of high temperatures. We detected no evolution of the linear TPCs for somatic growth, mass and development rate, and for the traits related to energy gain (ingestion rate) and costs (metabolic rate). As a result, also the relative thermal slope of energy gain versus energy costs did not vary. These results suggest the overall (rather than per capita) top-down impact of D. magna may increase under rapid thermal evolution.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1098/rspb.2022.2289
UKCEH and CEH Sections/Science Areas:	Water Resources (Science Area 2017-)
ISSN:	0962-8452
Additional Keywords:	activation energy, energetic efficiency, evolution of thermal performance curves, experimental evolution, generalist–specialist trade-off, hotter-is-better hypothesis
NORA Subject Terms:	Ecology and Environment
Date made live:	16 Feb 2023 13:22 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/533970

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