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Aciphylla glacialis mortality, growth and frost resistance: a field warming experiment
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4604230
Author(s) Geange, Sonya R.; Holloway-Phillips, Meisha-Marika; Briceno, Veronica F.; Nicotra, Adrienne B.
Author(s) at UniBasel Holloway-Phillips, Meisha-Marika
Year 2019
Title Aciphylla glacialis mortality, growth and frost resistance: a field warming experiment
Journal Australian Journal of Botany
Volume 67
Number 8
Pages / Article-Number 599-609
Keywords ice nucleation; intraspecific variation; open top chambers; phenotypic plasticity; transplant experiment
Mesh terms Science & TechnologyLife Sciences & BiomedicinePlant SciencesPlant Sciences
Abstract Decreasing snow depth and earlier snowmelt in alpine regions are expected to expose plants to a greater range of thermal extremes. Thus, paradoxically, in addition to increasing mean temperatures, aseasonal frost is likely to emerge as a major determinant of plant survival and development under a warming climate. Through the use of open top chambers, we assessed the effects of simulated warming on seedlings of the alpine herb Aciphylla glacialis (F.Muell.) Benth, sourced from provenances that vary in thermal characteristics. We hypothesised that seedlings grown at elevated temperature would have reduced survival and lower freezing resistance, but that individuals that did survive would show increased growth. Further, we hypothesised that seedlings sourced from the lower-elevation sites, where temperatures are more variable, would exhibit lower mortality at warmed conditions than those from sites with narrower thermal ranges. Warmed conditions significantly increased seedling mortality but those that survived grew slightly taller than their ambient counterparts, with no impact on leaf production or photosynthetic efficiency. Although the warming treatment did not influence temperature minimums, which would have allowed us to assess the impact of aseasonal frosts, there was no effect on freezing resistance. Contrary to our expectations, there was little evidence of variation among provenances. Our results indicate that a warmer climate with more extreme events may lead to a reduction in seedling establishment and survival; however, seedlings that do survive and establish are unlikely to express any lingering detrimental effects.
Publisher Csiro Publishing
ISSN/ISBN 0067-1924
edoc-URL https://edoc.unibas.ch/78647/
Full Text on edoc No
Digital Object Identifier DOI 10.1071/BT19034
ISI-Number 000519138200002
Document type (ISI) Article
 
   

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