Files and links (1)
Published (Version of Record)CC BY-NC-ND V4.0, Open Access
Journal article
Signatures of natural selection in a foundation tree along Mediterranean climatic gradients
Molecular Ecology, Vol.31(6), pp.1735-1752
2022
Appears in Open Access via Read & Publish Agreements
Abstract
Temperature and precipitation regimes are rapidly changing, resulting in forest dieback and extinction events, particularly in Mediterranean-type climates (MTC). Forest management that enhance forests’ resilience is urgently required, however adaptation to climates in heterogeneous landscapes with multiple selection pressures is complex. For widespread trees in MTC we hypothesized that: patterns of local adaptation are associated with climate; precipitation is a stronger factor of adaptation than temperature; functionally related genes show similar signatures of adaptation; and adaptive variants are independently sorting across the landscape. We sampled 28 populations across the geographic distribution of Eucalyptus marginata (jarrah), in South-west Western Australia, and obtained 13,534 independent single nucleotide polymorphic (SNP) markers across the genome. Three genotype-association analyses that employ different ways of correcting population structure were used to identify putatively adapted SNPs associated with independent climate variables. While overall levels of population differentiation were low (FST = 0.04), environmental association analyses found a total of 2336 unique SNPs associated with temperature and precipitation variables, with 1440 SNPs annotated to genic regions. Considerable allelic turnover was identified for SNPs associated with temperature seasonality and mean precipitation of the warmest quarter, suggesting that both temperature and precipitation are important factors in adaptation. SNPs with similar gene functions had analogous allelic turnover along climate gradients, while SNPs among temperature and precipitation variables had uncorrelated patterns of adaptation. These contrasting patterns provide evidence that there may be standing genomic variation adapted to current climate gradients, providing the basis for adaptive management strategies to bolster forest resilience in the future.
Details
- Title
- Signatures of natural selection in a foundation tree along Mediterranean climatic gradients
- Authors/Creators
- J.C. Filipe (Author/Creator)P.D. Rymer (Author/Creator)M. Byrne (Author/Creator)G. Hardy (Author/Creator)R. Mazanec (Author/Creator)C.W. Ahrens (Author/Creator)
- Publication Details
- Molecular Ecology, Vol.31(6), pp.1735-1752
- Publisher
- Blackwell Publishing
- Identifiers
- 991005540176407891
- Copyright
- © 2022 The Authors.
- Murdoch Affiliation
- Harry Butler Institute; Centre for Terrestrial Ecosystem Science and Sustainability
- Language
- English
- Resource Type
- Journal article
Metrics
59 File views/ downloads
69 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.64 Phylogenetics & Genomics
- 3.64.71 Genetic Diversity
- Web Of Science research areas
- Biochemistry & Molecular Biology
- Ecology
- Evolutionary Biology
- ESI research areas
- Environment/Ecology