Arid
DOI10.1093/aob/mcv069
Intra-population level variation in thresholds for physical dormancy-breaking temperature
Liyanage, Ganesha S.; Ooi, Mark K. J.
通讯作者Liyanage, Ganesha S.
来源期刊ANNALS OF BOTANY
ISSN0305-7364
EISSN1095-8290
出版年2015
卷号116期号:1页码:123-131
英文摘要

Background and Aims Intra-population variation in seed dormancy is an advantage for population persistence in unpredictable environments. The important role played by physically dormant species in these habitats makes understanding the level of variation in their dormancy a key ecological question. Heat produced in the soil is the major dormancy-breaking stimulus and, in fire prone ecosystems, soil temperatures generated by fire may vary spatially and over time. While many studies have investigated variation in initial dormancy, a measure that is of little value in fire-prone ecosystems, where initial dormancy levels are uniformly high, intra-population variation in dormancy-breaking temperature thresholds has never been quantified. This study predicted that species would display variation in dormancy-breaking temperature thresholds within populations, and investigated whether this variation occurred between individual plants from the same maternal environment.


Methods The intra-population variation in dormancy-breaking thresholds of five common physically dormant shrub species (family Fabaceae) from fire-prone vegetation in south-eastern Australia was assessed using heat treatments and germination trials. Replicate batches of seeds from each of four maternal plants of Dillwynia floribunda, Viminaria juncea, Bossiaea heterophylla, Aotus ericoides andAcacia linifolia were treated at 40, 60, 80, 100 and 120 A degrees C.


Key Results Dormancy-breaking response to heat treatments varied significantly among individual plants for all species, with some individuals able to germinate after heating at low temperatures and others restricting germination to temperatures that only occur as a result of high-severity fires. Germination rate varied among individuals of three species.


Conclusions Variation detected among individuals that were in close proximity to each other indicates that strong differences in dormancy-breaking temperature thresholds occur throughout the broader population. Differences found at the individual plant level could contribute to subsequent variation within the seed bank, providing a bet-hedging strategy, and represent a mechanism for increasing the probability of population persistence in the face of fire regime variability.


英文关键词Seed germination bet-hedging strategy coexistence dormancy-breaking thresholds Fabaceae fire intra-population germination hard seeds population persistence seed bank
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000357423200011
WOS关键词SEED-GERMINATION ; SOIL TEMPERATURES ; FIRE INTENSITY ; POSTFIRE GERMINATION ; DESERT ANNUALS ; CLIMATE-CHANGE ; LIFE-HISTORY ; SOUTH-AFRICA ; HEAT ; MANAGEMENT
WOS类目Plant Sciences
WOS研究方向Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/185750
作者单位Univ Wollongong, Ctr Sustainable Ecosyst Solut, Sch Biol Sci, Wollongong, NSW 2522, Australia
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GB/T 7714
Liyanage, Ganesha S.,Ooi, Mark K. J.. Intra-population level variation in thresholds for physical dormancy-breaking temperature[J],2015,116(1):123-131.
APA Liyanage, Ganesha S.,&Ooi, Mark K. J..(2015).Intra-population level variation in thresholds for physical dormancy-breaking temperature.ANNALS OF BOTANY,116(1),123-131.
MLA Liyanage, Ganesha S.,et al."Intra-population level variation in thresholds for physical dormancy-breaking temperature".ANNALS OF BOTANY 116.1(2015):123-131.
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