干旱区生态环境知识资源中心(Arid): Germination response of desert annuals to shrub facilitation is species specific but not ecotypic

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	Germination response of desert annuals to shrub facilitation is species specific but not ecotypic
	Liczner Amanda R; Sotomayor Diego A; Filazzola Alessandro; Lortie Christopher J
来源期刊	Journal of Plant Ecology
ISSN	1752-9921
出版年	2017
卷号	10 期号:2 页码:364-374
英文摘要	Aims Positive plant interactions can promote higher species density of beneficiary species in deserts. However, there is limited evidence examining the trait sets of seeds from beneficiary species. In this study, we examined the hypothesis that shrubs (benefactors) influence the germination of desert annuals (beneficiaries) and promote ecotypic differentiation by generating distinct microhabitats through abiotic stress amelioration. The following predictions were tested using growth chambers and field-collected seeds: (i) seed mass and viability will be greater and less variable for seeds collected from within shrub understory relative to seeds from open microhabitats, (ii) germination of seeds from shrub and open microhabitats will be greatest under simulated home (source) conditions, (iii) seeds from the shrub microhabitat will adaptively accelerate their germination rate when germinated in simulated home (source) microhabitats relative to their simulated away (reciprocal) microhabitat. Methods Seeds and their associated maternal plants were collected from four annual species found within a shrub understory (Larrea tridentata) and open microhabitats in the Mojave Desert of California (35.30oN, 117.26oW, 793 m. a.s.l.), and then reciprocally germinated in growth chambers simulating both microclimatic conditions. Cumulative germination and germination rate was measured every 4-5 days for 42 days. Important Findings There was no significant difference in the mean or coefficient of variation for seed mass and viability between the shrub and open microhabitats. The source of the seeds did not significantly impact the cumulative germination, and there was no accelerated rate of germination within potential species ecotypes thereby suggesting no ecotypic differentiation. Cumulative germination was significantly higher within the shrub-simulated microhabitat for three out of the four species examined. Cumulative germination and germination rate were significantly different between species. Hence, shrubs influence the germination of desert annuals, and the outcome of this interaction is species specific, but shrub microhabitats do not necessarily alter the more conserved seed biology traits. Future studies should examine the influence of gene flow on beneficiary adaptation and the influence of species-specificity on beneficiary species response to facilitation.
英文关键词	ecotypes facilitation germination seeds viability
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5962775
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335781
作者单位	Liczner Amanda R, Department of Biology, York University, Ontario M3J1P3, Canada.; Filazzola Alessandro, Department of Biology, York University, Ontario M3J1P3, Canada.; Lortie Christopher J, Department of Biology, York University, Ontario M3J1P3, Canada.; Sotomayor Diego A, Department of Geography, York University, Ontario M3J1P3, Canada.
推荐引用方式 GB/T 7714	Liczner Amanda R,Sotomayor Diego A,Filazzola Alessandro,et al. Germination response of desert annuals to shrub facilitation is species specific but not ecotypic[J],2017,10(2):364-374.
APA	Liczner Amanda R,Sotomayor Diego A,Filazzola Alessandro,&Lortie Christopher J.(2017).Germination response of desert annuals to shrub facilitation is species specific but not ecotypic.Journal of Plant Ecology,10(2),364-374.
MLA	Liczner Amanda R,et al."Germination response of desert annuals to shrub facilitation is species specific but not ecotypic".Journal of Plant Ecology 10.2(2017):364-374.