Temperature dependence of competitive ability is cold-shifted compared to that of growth rate in marine phytoplankton.

Autor: Sunday JM; Department of Biology, McGill University, Montreal, Quebec, Canada., Bernhardt JR; Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada., Harley CDG; Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada.; Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, British Columbia, Canada., O'Connor MI; Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada.
Jazyk: angličtina
Zdroj: Ecology letters [Ecol Lett] 2024 Jan; Vol. 27 (1), pp. e14337. Date of Electronic Publication: 2023 Dec 09.
DOI: 10.1111/ele.14337
Abstrakt: The effect of climate warming on community composition is expected to be contingent on competitive outcomes, yet approaches to projecting ecological outcomes often rely on measures of density-independent performance across temperatures. Recent theory suggests that the temperature response of competitive ability differs in shape from that of population growth rate. Here, we test this hypothesis empirically and find thermal performance curves of competitive ability in aquatic microorganisms to be systematically left-shifted and flatter compared to those of exponential growth rate. The minimum resource requirement for growth, R*-an inverse indicator of competitive ability-changes with temperature following a U-shaped pattern in all four species tested, contrasting from their left-skewed density-independent growth rate thermal performance curves. Our results provide new evidence that exploitative competitive success is highest at temperatures that are sub-optimal for growth, suggesting performance estimates of density-independent variables might underpredict performance in cooler competitive environments.
(© 2023 The Authors. Ecology Letters published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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