The Miena cider gum, Eucalyptus gunnii subsp. divaricata (Myrtaceae): a taxon in rapid decline

Potts, BM; Potts, Wendy C.; Kantvilas, G

doi:10.26749/rstpp.135.57

Cited by 13 publications

(8 citation statements)

References 20 publications

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“…Nevertheless, despite its strong resistance to cavitation and low minimum conductance, recent reports of dieback in E. gunnii ssp. divaricata populations suggest the species is susceptible to high mortality rates under drought conditions ( Potts et al 2001 , Calder and Kirkpatrick 2008 ). Further research is required, including a more detailed assessment of hydraulic properties and rooting depth, to better understand the drivers of these mortality events in E. gunnii ssp.…”

Section: Discussionmentioning

confidence: 99%

Cold temperature and aridity shape the evolution of drought tolerance traits in Tasmanian species of Eucalyptus

Hartill,

Blackman,

Halliwell

et al. 2023

Tree Physiology

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Perennial plant species from water-limiting environments (including climates of extreme drought, heat, and freezing temperatures) have evolved traits that allow them to tolerate these conditions. As such, traits that are associated with water stress may show evidence of adaptation to climate when compared among closely related species inhabiting contrasting climatic conditions. In this study, we tested whether key hydraulic traits linked to drought stress, including the vulnerability of leaves to embolism (P50 leaf) and the minimum diffusive conductance of shoots (gmin) were associated with climatic characteristics of fourteen Tasmanian eucalypt species from sites that vary in precipitation and temperature. Across species, greater cavitation resistance (more negative P50 leaf) was associated with increasing aridity and decreasing minimum temperature. In contrast, gmin showed strong associations with aridity only. Among these Tasmanian eucalypts, evidence suggests that trait variation is influenced by both cold and dry conditions, highlighting the need to consider both aspects when exploring adaptive trait-climate relationships.

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Section: Discussionmentioning

confidence: 99%

Cold temperature and aridity shape the evolution of drought tolerance traits in Tasmanian species of Eucalyptus

Hartill,

Blackman,

Halliwell

et al. 2023

Tree Physiology

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“…In Eucalyptus ( Fig. 3 and Table 2), phenotypic and genetic differentiation along altitudinal gradients is also usually clinal, involves multiple traits, and cline forms may be sufficiently distinctive to warrant subspecific recognition (Potts & Jackson 1986, McGowen et al 2001Potts, Potts & Kantvilas 2001). One of the best-known examples is the stepped cline that occurs in the continuous population of *Data were obtained from observations made in two Quercus petraea stands located along two valleys on the northern slopes of the Pyr en ees.…”

Section: Extant Phenotypic and Genetic Divergence Along Environmentalmentioning

confidence: 99%

Genetic divergence in forest trees: understanding the consequences of climate change

2013

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Summary 1.Predicted climate change is heading in many respects into untested environmental conditions for trees and to the reshuffling of species distributions. We explore the consequences that these changes are likely to have on population differentiation of adaptive traits. Superimposed on the spatial redistribution of the species, will there be a redistribution of their genetic variation? 2. We base our predictions on a conceptual framework, whose elements are the extant differentiation, and the predicted divergent evolution of populations along purposely chosen altitudinal/latitudinal gradients. We consider simultaneously phenotypic and genetic divergence, but emphasize genetically driven population differentiation. We illustrate phenotypic and genetic patterns of variation with examples from well-studied northern and southern hemisphere tree genera Quercus and Eucalyptus. 3. Most phenotypic traits show very large in situ clinal variation with variation in altitude or latitude. Genetic clines detected in common gardens usually follow the observed in situ phenotypic clines, reflecting cogradient variation. Rare counter gradients have also been detected, where phenotypic and genetic clines exhibit opposing signs. These patterns suggest that plasticity and selection contributed in most cases synergistically to the extant differentiation. 4. We anticipate that microevolutionary processes will be different along environmental gradients. At the leading edge, availability of newly suitable habitats will trigger migration favouring genotypes equipped with colonists attributes. At the rear edges of the distribution, populations will be submitted to strong selective pressures favouring genotypes capable of withstanding drought and heat stress. Central populations will benefit from the plastic response of trees that will temporarily compensate for the maladaptation, until genetic adaptive variation will be restored by gene flow, mutation or recombination. 5. We make predictions about future differentiation along environmental gradients, by highlighting traits that are likely to diverge, the rate at which differentiation will take place, and the role of gene flow and hybridization. We envisage that parallel selection may maintain differentiation at extant levels, whereas divergent selection will promote substantial differentiation for traits facilitating adaptation to contrasting conditions along the environmental gradient. We anticipate that genetic divergence may occur very rapidly and will be enhanced by the multilocus architecture of most adaptive traits.

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“…The early 1990s saw an increase in the extent and severity of rural tree decline in Tasmania (Neyland 1996;Potts et al 2001), which only became more severe with each passing decade (Close & Davidson 2004). Senator Robert Hill had launched Landcare in 1989, and this was coupled with increased revegetation activity during the Decade of Landcare with programmes such as the National Landcare Program, Save the Bush, One Billion Trees and Regional Farm Forestry.…”

Section: The Evolution Of Protection and Restoration Approachesmentioning

confidence: 99%

Tasmanian Midlands: A case study of increasing sophistication in conservation planning and action over four decades

Gilfedder¹,

Appleby²,

Lechner³

et al. 2021

Eco Management Restoration

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The conservation significance of the Tasmanian Midlands, an agricultural region that is largely privately owned and has suffered significant land degradation and loss of biodiversity, has been recognised since the 1980s. Four decades of conservation planning and implementation has seen the evolution of biodiversity protection, revegetation, bush rehabilitation and climate-ready habitat restoration. Relationships and trust have been built enabling the development of capacity in the farming community and conservation sector. This paper presents for the first time the chronology of four decades of landscape conservation planning and implementation in the Tasmanian Midlands. Remnant protection, restoration and revegetation efforts have evolved from the site level to landscape scale, leading to a conservation approach incorporating ecological restoration in its broadest sense. Successive iterations saw key initiatives including Midlands Bushweb, Midlandscapes, the Midlands Conservation Fund and the Tasmanian Island Ark project. Spatial tools and models have grown from simple maps and aerial photos to early GIS products including farm plans (revolutionary in their day) and asset maps, to increasingly complex spatial models of corridors using least-cost path analysis and fine-scale multi-species models of functional connectivity. However, critical to success in these challenging agricultural landscapes has been the relationships of trust and collaboration built between local farmers and conservation planners.

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The Miena cider gum, Eucalyptus gunnii subsp. divaricata (Myrtaceae): a taxon in rapid decline

Cited by 13 publications

References 20 publications

Cold temperature and aridity shape the evolution of drought tolerance traits in Tasmanian species of Eucalyptus

Cold temperature and aridity shape the evolution of drought tolerance traits in Tasmanian species of Eucalyptus

Genetic divergence in forest trees: understanding the consequences of climate change

Tasmanian Midlands: A case study of increasing sophistication in conservation planning and action over four decades

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