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Dryad

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

Cite this dataset

Wang, Ying-Jie et al. (2022). Data: Rapid evolution of unimodal but not of linear thermal performance curves in Daphnia magna [Dataset]. Dryad. https://doi.org/10.5061/dryad.1jwstqjzq

Abstract

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 1st 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 vs. 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.

Funding

Research Foundation - Flanders, Award: G.0524.17N

KU Leuven, Award: C16/17/002

Research Foundation - Flanders, Award: G.0956.19N