Aciphylla glacialis mortality, growth and frost resistance: a field warming experiment

Geange, Sonya R. and Holloway-Phillips, Meisha-Marika and Briceno, Veronica F. and Nicotra, Adrienne B.. (2019) Aciphylla glacialis mortality, growth and frost resistance: a field warming experiment. Australian Journal of Botany, 67 (8). pp. 599-609.

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Official URL: https://edoc.unibas.ch/78647/

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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.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Holloway-Phillips, Meisha-Marika
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Csiro Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:01 Oct 2020 10:53
Deposited On:01 Oct 2020 10:53

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