Convergent evolution of reduced energy demands in extremophile fish

PloS One
Courtney PassowMichael Tobler

Abstract

Convergent evolution in organismal function can arise from nonconvergent changes in traits that contribute to that function. Theory predicts that low resource availability and high maintenance costs in extreme environments select for reductions in organismal energy demands, which could be attained through modifications of body size or metabolic rate. We tested for convergence in energy demands and underlying traits by investigating livebearing fish (genus Poecilia) that have repeatedly colonized toxic, hydrogen sulphide-rich springs. We quantified variation in body size and routine metabolism across replicated sulphidic and non-sulphidic populations in nature, modelled total organismal energy demands, and conducted a common-garden experiment to test whether population differences had a genetic basis. Sulphidic populations generally exhibited smaller body sizes and lower routine metabolic rates compared to non-sulphidic populations, which together caused significant reductions in total organismal energy demands in extremophile populations. Although both mechanisms contributed to variation in organismal energy demands, variance partitioning indicated reductions of body size overall had a greater effect than reductions of routine ...Continue Reading

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Citations

Dec 12, 2017·Genome Génome / Conseil National De Recherches Canada·Nicholas BartsMichael Tobler
Jun 4, 2019·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Anthony P BrownJoanna L Kelley
Mar 19, 2020·Evolution; International Journal of Organic Evolution·Pamela B HartProsanta Chakrabarty
Mar 10, 2021·BMC Ecology and Evolution·João M MorenoVitor C Sousa

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