Can physiological engineering/programming increase multi-generational thermal tolerance to extreme temperature events?

The Journal of Experimental Biology
Kris L SorbyTim S Jessop

Abstract

Organisms increasingly encounter higher frequencies of extreme weather events as a consequence of global climate change. Currently, few strategies are available to mitigate climate change effects on animals arising from acute extreme high-temperature events. We tested the capacity of physiological engineering to influence the intra- and multi-generational upper thermal tolerance capacity of a model organism, Artemia, subjected to extreme high temperatures. Enhancement of specific physiological regulators during development could affect thermal tolerance or life-history attributes affecting subsequent fitness. Using experimental Artemia populations, we exposed F0 individuals to one of four treatments: heat hardening (28°C to 36°C, 1°C per 10 min), heat hardening plus serotonin (0.056 μg ml-1), heat hardening plus methionine (0.79 mg ml-1) and a control treatment. Regulator concentrations were based on previous literature. Serotonin may promote thermal tolerance, acting upon metabolism and life history. Methionine acts as a methylation agent across generations. For all groups, measurements were collected for three performance traits of individual thermal tolerance (upper sublethal thermal limit, lethal limit and dysregulation ran...Continue Reading

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