DOI: 10.1111/gcb.13984
Scopus记录号: 2-s2.0-85036574580
论文题名: Can Antarctic lichens acclimatize to changes in temperature?
作者: Colesie C. ; Büdel B. ; Hurry V. ; Green T.G.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 3 起始页码: 1123
结束页码: 1135
语种: 英语
英文关键词: Antarctica
; biological soil crusts
; climate warming
; lichen
; net photosynthesis
; thermal acclimation
; Usnea aurantiaco-atra
Scopus关键词: bryophytes
; Usnea aurantiacoatra
英文摘要: The Antarctic Peninsula, a tundra biome dominated by lichens and bryophytes, is an ecozone undergoing rapid temperature shifts. Such changes may demand a high physiological plasticity of the local lichen species to maintain their role as key drivers in this pristine habitat. This study examines the response of net photosynthesis and respiration to increasing temperatures for three Antarctic lichen species with different ecological response amplitudes. We hypothesize that negative effects caused by increased temperatures can be mitigated by thermal acclimation of respiration and/or photosynthesis. The fully controlled growth chamber experiment simulated intermediate and extreme temperature increases over the time course of 6 weeks. Results showed that, in contrast to our hypothesis, none of the species was able to down-regulate temperature-driven respiratory losses through thermal acclimation of respiration. Instead, severe effects on photobiont vitality demonstrated that temperatures around 15°C mark the upper limit for the two species restricted to the Antarctic, and when mycobiont demands exceeded the photobiont capacity they could not survive within the lichen thallus. In contrast, the widespread lichen species was able to recover its homoeostasis by rapidly increasing net photosynthesis. We conclude that to understand the complete lichen response, acclimation processes of both symbionts, the photo- and the mycobiont, have to be evaluated separately. As a result, we postulate that any acclimation processes in lichen are species-specific. This, together with the high degree of response variability and sensitivity to temperature in different species that co-occur spatially close, complicates any predictions regarding future community composition in the Antarctic. Nevertheless, our results suggest that species with a broad ecological amplitude may be favoured with on-going changes in temperature. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110494
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå, Sweden; Department of Plant Ecology and Systematics, University of Kaiserslautern, Kaiserslautern, Germany; Departamento de Biologia Vegetal II, Facultad de Farmacia, Universidad Complutense, Madrid, Spain; Department of Biological Sciences, University of Waikato, Hamilton, New Zealand
Recommended Citation:
Colesie C.,Büdel B.,Hurry V.,et al. Can Antarctic lichens acclimatize to changes in temperature?[J]. Global Change Biology,2018-01-01,24(3)