Arid
DOI10.3732/ajb.1700008
Fire after a mast year triggers mass recruitment of slender mulga (Acacia aptaneura), a desert shrub with heat-stimulated germination
Wright, Boyd R.1,2,3; Fensham, Roderick J.4,5
通讯作者Wright, Boyd R.
来源期刊AMERICAN JOURNAL OF BOTANY
ISSN0002-9122
EISSN1537-2197
出版年2017
卷号104期号:10页码:1474-1483
英文摘要

PREMISE OF THE STUDY: Fire typically triggers extensive regeneration of plants with heat-stimulated germination by causing short periods of intense soil heating. If plants with heat-stimulated germination are also subject to seed predation and display mast-seeding cycles, postfire recruitment may be contingent on the seedfall density of prefire masts, and on whether granivores are satiated at the time of fire.


METHODS: We conducted a longitudinal seedbank study and a mensurative field experiment in central Australia to examine whether fire and the variation in seedfall density across sites in a mast year interact to influence recruitment of slender mulga (Acacia aptaneura), an iteroparous masting shrub with heat-stimulated germination.


KEY RESULT: The seedbank study showed seedbank pulsing after masting, with mean seed counts in the upper 4-cm soil layer being 132.8 seeds/m(2) 12-mo after a dense seedfall, but only 3.8 seeds/m(2) following a year with no seed production. Consistent with this, recruitment increased postfire at sites where denser seedfall had occurred during the preburn mast year. Conversely, little recruitment occurred at unburnt populations, irrespective of prefire seedfall density.


CONCLUSIONS: We attribute our findings to: (1) elevated soil temperatures during fires stimulating germination of heat-cued seeds; and (2) granivore satiation following masting facilitating assimilation of seeds into the soil seedbank. These results highlight the importance of rare seed-input events for regeneration in fire-prone systems dominated by masting plants, and provide the first example from an arid biome of fire interacting with masting to influence recruitment.


英文关键词Aridity Bayesian statistics Fabaceae fire ecology mass flowering mast seeding predator satiation recruitment reproductive ecology seedbank
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000413976200011
WOS关键词CENTRAL AUSTRALIAN RANGELANDS ; ARID ZONE SHRUBS ; EVOLUTIONARY ECOLOGY ; WESTERN-AUSTRALIA ; PREDATOR SATIATION ; WIND POLLINATION ; FRUIT PRODUCTION ; FAGUS-CRENATA ; BURIED SEEDS ; RODENTS
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/2XILL650/197237
作者单位1.Univ New England, Sch Environm & Rural Sci, Bot, Armidale, NSW 2350, Australia;
2.Univ Queensland, Sch Agr & Food Sci, St Lucia, Qld 4072, Australia;
3.Dept Land Resource Management, Northern Terr Herbarium, Alice Springs, NT 0871, Australia;
4.Univ Queensland, Sch Biol Sci, St Lucia, Qld 4072, Australia;
5.Queensland Herbarium, Mt Coot Tha Rd, Brisbane, Qld 4066, Australia
推荐引用方式
GB/T 7714
Wright, Boyd R.,Fensham, Roderick J.. Fire after a mast year triggers mass recruitment of slender mulga (Acacia aptaneura), a desert shrub with heat-stimulated germination[J],2017,104(10):1474-1483.
APA Wright, Boyd R.,&Fensham, Roderick J..(2017).Fire after a mast year triggers mass recruitment of slender mulga (Acacia aptaneura), a desert shrub with heat-stimulated germination.AMERICAN JOURNAL OF BOTANY,104(10),1474-1483.
MLA Wright, Boyd R.,et al."Fire after a mast year triggers mass recruitment of slender mulga (Acacia aptaneura), a desert shrub with heat-stimulated germination".AMERICAN JOURNAL OF BOTANY 104.10(2017):1474-1483.
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