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Directional selection on tree seedling traits driven by experimental drought differs between mesic and dry populations

Costa e Silva, J, Jordan, R, Potts, BM ORCID: 0000-0001-6244-289X, Pinkard, E and Prober, SM 2021 , 'Directional selection on tree seedling traits driven by experimental drought differs between mesic and dry populations' , Frontiers in Ecology and Evolution, vol. 9 , doi: https://doi.org/10.3389/fevo.2021.722964.

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Abstract

We evaluated population differences and drought-induced phenotypic selection on four seedling traits of the Australian forest tree Eucalyptus pauciflora using a glasshouse dry-down experiment. We compared dry and mesic populations and tested for directional selection on lamina length (reflecting leaf size), leaf shape, the node of ontogenetic transition to the petiolate leaf (reflecting the loss of vegetative juvenility), and lignotuber size (reflecting a recovery trait). On average, the dry population had smaller and broader leaves, greater retention of the juvenile leaf state and larger lignotubers than the mesic population, but the populations did not differ in seedling survival. While there was statistical support for directional selection acting on the focal traits in one or other population, and for differences between populations in selection gradient estimates for two traits, only one trait—lamina length—exhibited a pattern of directional selection consistent with the observed population differences being a result of past adaptation to reduce seedling susceptibility to acute drought. The observed directional selection for lamina length in the mesic population suggests that future increases in drought risk in the wild will shift the mean of the mesic population toward that of the dry population. Further, we provide evidence suggesting an early age trade-off between drought damage and recovery traits, with phenotypes which develop larger lignotubers early being more susceptible to drought death. Such trade-offs could have contributed to the absence of population mean differences in survival, despite marked differentiation in seedling traits.

Item Type: Article
Authors/Creators:Costa e Silva, J and Jordan, R and Potts, BM and Pinkard, E and Prober, SM
Keywords: adaptation to drought, trade-off, leaf length and shape, vegetative juvenility, lignotuber size, selection gradient, generalized linear mixed model, Eucalyptus pauciflora
Journal or Publication Title: Frontiers in Ecology and Evolution
Publisher: Frontiers Research Foundation
ISSN: 2296-701X
DOI / ID Number: https://doi.org/10.3389/fevo.2021.722964
Copyright Information:

Copyright © 2021 Costa e Silva, Jordan, Potts, Pinkard and Prober. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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