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Journal article
Germination temperature sensitivity differs between co‐occurring tree species and climate origins resulting in contrasting vulnerability to global warming
Plant-environment interactions (Hoboken, N.J. : 2018), Vol.4(3), pp.146-162
2023
Abstract
Climate change is shifting temperatures from historical patterns, globally impacting forest composition and resilience. Seed germination is temperature-sensitive, making the persistence of populations and colonization of available habitats vulnerable to warming. This study assessed germination response to temperature in foundation trees in south-western Australia's Mediterranean-type climate forests (Eucalyptus marginata (jarrah) and Corymbia calophylla (marri)) to estimate the thermal niche and vulnerability among populations. Seeds from the species' entire distribution were collected from 12 co-occurring populations. Germination thermal niche was investigated using a thermal gradient plate (5–40°C). Five constant temperatures between 9 and 33°C were used to test how the germination niche (1) differs between species, (2) varies among populations, and (3) relates to the climate of origin. Germination response differed among species; jarrah had a lower optimal temperature and thermal limit than marri (To 15.3°C, 21.2°C; ED50 23.4°C, 31°C, respectively). The thermal limit for germination differed among populations within both species, yet only marri showed evidence for adaptation to thermal origins. While marri has the capacity for germination at higher thermal temperatures, jarrah is more vulnerable to global warming exceeding safety margins. This discrepancy is predicted to alter species distributions and forest composition in the future.
Details
- Title
- Germination temperature sensitivity differs between co‐occurring tree species and climate origins resulting in contrasting vulnerability to global warming
- Authors/Creators
- João C. Filipe - Department of Biodiversity, Conservation and AttractionsCollin C. Ahrens - Western Sydney UniversityMargaret Byrne - Department of Biodiversity, Conservation and AttractionsGiles Hardy - Murdoch UniversityPaul D. Rymer - Western Sydney University
- Publication Details
- Plant-environment interactions (Hoboken, N.J. : 2018), Vol.4(3), pp.146-162
- Identifiers
- 991005579954207891
- Copyright
- © 2023 The Authors
- Murdoch Affiliation
- Centre for Terrestrial Ecosystem Science and Sustainability
- Language
- English
- Resource Type
- Journal article
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