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Variations in ramet performance and the dynamics of an alpine evergreen herb, Gentiana nipponica, in different snowmelt conditions

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Title: Variations in ramet performance and the dynamics of an alpine evergreen herb, Gentiana nipponica, in different snowmelt conditions
Authors: Kawai, Yuka Browse this author
Kudo, Gaku Browse this author →KAKEN DB
Keywords: demography
genet growth
Gentianaceae
growing season
leaf function
life-history variation
local adaptation
simulation
size dependency
snowmelt gradient
Issue Date: Nov-2018
Publisher: John Wiley & Sons
Journal Title: American journal of botany
Volume: 105
Issue: 11
Start Page: 1813
End Page: 1823
Publisher DOI: 10.1002/ajb2.1186
PMID: 30388310
Abstract: Premise of the Study Methods Variation in demographic parameters reflects the life-history strategies of plants in response to specific environments. We aimed to investigate the intraspecific variation in life-history traits of a clonal alpine herb, Gentiana nipponica, in various snowmelt conditions. Individual ramets within genets accumulate leaves for 7-9 yr without shedding, and die after reproduction. We tested the physiological function of accumulated leaves for reproduction and monitored the ramet demography in early, intermediate, and late snowmelt populations over 3 yr. Then, we simulated ramet dynamics using the demographic parameters. Key Results Conclusions Old leaves had a carbon storage function, and the initiation of reproduction depended on the amount of ramet leaves. Growth and reproductive performance were highest in the population with an intermediate snowmelt period. The early snowmelt population showed short persistence periods due to restricted growth and high mortality of the ramets. The late snowmelt populations showed slow growth, but high survival rate of the ramets, in which the ramet size at reproduction was smallest and fruit formation was often suppressed by the short growing period. Limiting factors dictating the distribution of G. nipponica differed between the early and late snowmelt habitats. High mortality and restricted growth, because of the harsh environment, determine the distribution limit toward earlier snowmelt locations. By contrast, late snowmelt strongly limited fecundity because of the short period for fruit maturation. The difference in snowmelt time provides a clear gradient of selective forces that may promote local adaptation among neighboring populations.
Type: article (author version)
URI: http://hdl.handle.net/2115/72367
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 川合 由加

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