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dc.contributor.authorRajapakshe, Rajapakshe P.V.G.S.W.
dc.contributor.authorTurner, Shane R.
dc.contributor.authorCross, Adam
dc.contributor.authorTomlinson, Sean
dc.date.accessioned2021-07-19T02:31:32Z
dc.date.available2021-07-19T02:31:32Z
dc.date.issued2020
dc.identifier.citationRajapakshe, R.P.V.G.S.W. and Turner, S.R. and Cross, A.T. and Tomlinson, S. 2020. Hydrological and thermal responses of seeds from four co-occurring tree species from southwest Western Australia. Conservation Physiology. 8 (1): Article No. coaa021.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/84612
dc.identifier.doi10.1093/conphys/coaa021
dc.description.abstract

Seed germination is a critical stage in the life cycle of most plants and is defined by specific tolerance thresholds beyond which rates and success of germination rapidly decline. Previous studies have demonstrated that widespread plant species commonly germinate over a broad range of temperatures and water stress levels, whereas range-restricted species often exhibit a narrower germination window in terms of temperature and moisture. We investigated the relationships of the key germination traits of maximum germination (Gmax) and time to 50% germination (t50) in response to temperature (5-35°C) and water stress (-1.5-0 MPa) in four co-occurring Western Australian native Eucalyptus species with widely varying biogeography. Eucalyptus caesia subsp. caesia and E. ornata exhibit a highly localized distribution and a narrow geographical range, being restricted either to granite outcrops or the upper slopes and tops of lateritic rises, respectively. These two species were compared with the two widespread and dominant congenerics E. salmonophloia and E. salubris. There was a distinctive hump-shaped response of t50 to temperature and an exponential response to water stress, characteristic of rate- and threshold-limited processes, but no consistent pattern in the response of Gmax. The four species were significantly different in their thermal performance of t50, with E. caesia and E. ornata displaying narrower thermal tolerance ranges than the two widespread species. In terms of mean final germination percentage, the two range-restricted endemic taxa exhibited higher lability in their response to thermal stress and drought stress compared to the two broadly distributed congenerics. These findings indicate a link between distributional extent, temperature and water stress tolerance and may have implications for identifying ecological filters of rarity and endemism.

dc.languageEnglish
dc.publisherOXFORD UNIV PRESS
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/IC150100041
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectScience & Technology
dc.subjectLife Sciences & Biomedicine
dc.subjectBiodiversity Conservation
dc.subjectEcology
dc.subjectEnvironmental Sciences
dc.subjectPhysiology
dc.subjectBiodiversity & Conservation
dc.subjectEnvironmental Sciences & Ecology
dc.subjectConservation
dc.subjectdrought stress
dc.subjectperformance model
dc.subjectseed germination
dc.subjectthermal tolerance
dc.subjectthreatened flora
dc.subjectGERMINATION ECOLOGY
dc.subjectIRONSTONE OUTCROPS
dc.subjectGRANITE OUTCROPS
dc.subjectTEMPERATURE
dc.subjectEUCALYPTUS
dc.subjectDORMANCY
dc.subjectCONSERVATION
dc.subjectVEGETATION
dc.subjectDIVERSITY
dc.subjectLIGHT
dc.titleHydrological and thermal responses of seeds from four co-occurring tree species from southwest Western Australia
dc.typeJournal Article
dcterms.source.volume8
dcterms.source.number1
dcterms.source.issn2051-1434
dcterms.source.titleConservation Physiology
dc.date.updated2021-07-19T02:31:32Z
curtin.note

This article has been accepted for publication in Conservation Physiology © 2020 The Authors. Published by Oxford University Press and the Society for Experimental Biology. All rights reserved.

curtin.departmentSchool of Molecular and Life Sciences (MLS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidTomlinson, Sean [0000-0003-0864-5391]
curtin.contributor.orcidCross, Adam [0000-0002-5214-2612]
curtin.contributor.researcheridCross, Adam [F-5450-2012]
curtin.identifier.article-numberARTN coaa021
dcterms.source.eissn2051-1434
curtin.contributor.scopusauthoridTomlinson, Sean [22036612300]
curtin.contributor.scopusauthoridCross, Adam [55829876800]


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