Climate Adaptation, Drought Susceptibility, and Genomic-Informed Predictions of Future Climate Refugia for the Australian Forest Tree Eucalyptus globulus

Butler, Jakob B.; Harrison, Peter A.; Vaillancourt, René E.; Steane, Dorothy A.; Tibbits, Josquin; Potts, Brad M.

doi:10.3390/f13040575

Cited by 4 publications

(1 citation statement)

References 153 publications

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“…A large number of studies to date have focused on woody species, for example, trees such as eucalypts (e.g. Steane et al 2014;Butler et al 2022), oaks (e.g. Gugger et al 2021), poplars (e.g.…”

Section: Introductionmentioning

confidence: 99%

Landscape genomics reveals signals of climate adaptation and a cryptic lineage in Arthropodium fimbriatum

et al. 2023

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Habitat loss and fragmentation are critical threats to biodiversity. Consequent decreases in population size and connectivity can impact genetic diversity and, thus, future adaptability and resilience to environmental change. Understanding landscape patterns of genetic diversity, including patterns of adaptive variation, can assist in developing conservation strategies that maximise population persistence and adaptability in the face of environmental change. Using a reduced-representation genomic approach, we investigated genetic diversity, structure, and adaptive variation across an aridity gradient in the woodland forb Arthropodium fimbriatum. Moderate levels of genetic diversity (HS = 0.14–0.23) were found in all 13 sampled provenances. Inbreeding varied among provenances (FIS = 0.08–0.42) but was not associated with estimated population size. Four genetic clusters were identified, including one highly differentiated cluster. Higher pairwise FST (0.23–0.42) between the three provenances of this cluster and the remaining 10 provenances (pairwise FST between 10 provenances 0.02–0.32) suggested two highly divergent lineages or potentially a cryptic species. After excluding the three highly differentiated populations, outlier and genotype-environment association analysis identified 275 putatively adaptive loci suggesting genomic signatures of climate adaptation in A. fimbriatum is primarily associated with changes in aridity. Combined, these results suggest that all provenances have conservation value, contributing to the maintenance of genetic diversity and adaptive variation in this species. The uncovering of a potential cryptic taxon highlights the power of genomics approaches in conservation genetics and the importance of understanding the role of landscape variation shaping genetic variation to effectively define conservation management units in an era of rapid biodiversity decline.

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Section: Introductionmentioning

confidence: 99%

Landscape genomics reveals signals of climate adaptation and a cryptic lineage in Arthropodium fimbriatum

et al. 2023

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Enviromic prediction enables the characterization and mapping of Eucalyptus globulus Labill breeding zones

Callister,

Costa-Neto,

Bradshaw

et al. 2024

Tree Genetics & Genomes

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Genotype-environment interaction is pervasive in forest genetics. Delineation of spatial breeding zones (BZs) is fundamental for accommodating genotype-environment interaction. Here we developed a BZ classification pipeline for the forest tree Eucalyptus globulus in 2 Australian regions based on phenotypic, genomic, and pedigree data, as well on a detailed environmental characterization (“envirotyping”) and spatial mapping of BZs. First, the factor analytic method was used to model additive genetic variance and site–site genetic correlations (rB) in stem volume across 48 trials of 126,467 full-sib progeny from 2 separate breeding programs. Thirty-three trials were envirotyped using 145 environmental variables (EVs), involving soil and landscape (71), climate (73), and management (1) EVs. Next, sparse partial least squares-discriminant analysis was used to identify EVs that were required to predict classification of sites into 5 non-exclusive BZ classes based on rB. Finally, these BZs were spatially mapped across the West Australian and “Green Triangle” commercial estates by enviromic prediction using EVs for 80 locations and 15 sets of observed climate data to represent temporal variation. The factor analytic model explained 85.9% of estimated additive variance. Our environmental classification system produced within-zone mean rB between 0.76 and 0.84, which improves upon the existing values of 0.62 for Western Australia and 0.67 for Green Triangle as regional BZs. The delineation of 5 BZ classes provides a powerful framework for increasing genetic gain by matching genotypes to current and predicted future environments.

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Established Invasive Tree Species Offer Opportunities for Forest Resilience to Climate Change

Nyssen,

Ouden,

Bindewald

et al. 2024

Curr. For. Rep.

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Climate Adaptation, Drought Susceptibility, and Genomic-Informed Predictions of Future Climate Refugia for the Australian Forest Tree Eucalyptus globulus

Cited by 4 publications

References 153 publications

Landscape genomics reveals signals of climate adaptation and a cryptic lineage in Arthropodium fimbriatum

Landscape genomics reveals signals of climate adaptation and a cryptic lineage in Arthropodium fimbriatum

Enviromic prediction enables the characterization and mapping of Eucalyptus globulus Labill breeding zones

Established Invasive Tree Species Offer Opportunities for Forest Resilience to Climate Change

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