Predation changes the shape of thermal performance curves for population growth rate

Current Zoology
Thomas M Luhring, John P DeLong

Abstract

Ectotherms generally demonstrate nonlinear changes in performance (e.g., movement speed, individual growth, population growth) as a function of temperature that are characterized by thermal performance curves (TPC). Predation risk elicits phenotypic and behavioral changes that likewise impact performance measures. We tested whether exposure to predationOrthocyclops modestusimpacts the maximum population growth rate (rmax) TPC of the protistParamecium aurelia. We fit predator and non-predator exposedP. aureliapopulation growth rates to a function previously shown to best describeParameciumpopulation growth rate TPC's (Lactin-2) and compared subsequent parameter estimates between curves. ForParameciumexposed to predation risk, maximum population growth increased more rapidly as temperatures rose and decreased more rapidly as temperatures fell compared to the initial temperature. The area under each TPC curve remained approximately the same, consistent with the idea of a trade-off in performance across temperatures. Our results indicate TPCs are flexible given variation in food web context and that trophic interactions may play an important role in shaping TPCs. Furthermore, this and other studies illustrate the need for a mechani...Continue Reading

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Citations

Jun 14, 2018·The Journal of Experimental Biology·Katie E Marshall, Brent J Sinclair
May 31, 2019·Global Change Biology·Samuel B FeySusana Clusella-Trullas
Sep 14, 2018·Proceedings. Biological Sciences·Joey R BernhardtMary I O'Connor
Jul 1, 2017·Integrative and Comparative Biology·Thomas M Luhring, John P DeLong
Oct 3, 2018·Ecology and Evolution·Thomas M LuhringJohn P DeLong
Oct 11, 2019·Oecologia·Thomas M LuhringJohn P DeLong
May 16, 2019·The Journal of Experimental Biology·Vanessa KellermannCarla M Sgrò
Oct 29, 2020·The Journal of Experimental Biology·Dillon J Chung, Patricia M Schulte
Jul 20, 2021·Trends in Ecology & Evolution·Allison M LouthanLauren G Shoemaker
Jul 1, 2021·Evolution; International Journal of Organic Evolution·Miranda E Salsbery, John P DeLong

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Methods Mentioned

BETA
environmental pressure

Software Mentioned

MatLab

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