干旱区生态环境知识资源中心(Arid): Pods as sails but not as boats: dispersal ecology of a habitat-restricted desert milkvetch

Arid

DOI	10.1002/ajb2.1473
	Pods as sails but not as boats: dispersal ecology of a habitat-restricted desert milkvetch
	Houghton, Sydney 1; Stevens, Michael T.1; Meyer, Susan E.2
通讯作者	Houghton, Sydney
来源期刊	AMERICAN JOURNAL OF BOTANY
ISSN	0002-9122
EISSN	1537-2197
出版年	2020
卷号	107 期号:6 页码:864-875
英文摘要	Premise Adaptive seed dispersal mechanisms are fundamental to plant fitness, but dispersal advantage is scale-dependent. We tested the hypothesis that informed dispersal in response to an environmental cue enables dispersal by wind on a local scale for Astragalus holmgreniorum, a desert species restricted to swales and wash skirts with overland flow, but prevents longer-distance dispersal by water into unfavorable wash habitats. Methods Pod biomechanics in A. holmgreniorum lead to major shape modifications with changes in moisture content. We performed laboratory experiments to examine the interaction of pod shape with wind and water, and conducted field experiments in A. holmgreniorum habitat evaluating the roles of wind, water, and seed predators on dispersal. Results Dry pods exhibit a flattened crescent shape with partial dehiscence that facilitated wind dispersal by ground tumbling and seed scattering in laboratory experiments. Rain simulation experiments showed that even small precipitation events returned wetted pods to their cylindrical shape and opened the dorsal suture, exposing the seeds. In the field experiments, dry pods were moved locally by wind, whereas rain caused pod opening and washing out of seeds in place. Seed predators had minimal effect on pod movement. Conclusions Astragalus holmgreniorum exhibits pod structural remodeling in response to environmental change in a striking and novel demonstration of informed dispersal. Wind-driven movement of dry pods facilitates local seed dispersal, but rain causes pods to open and release seeds, ensuring that they are not transported out of suitable habitats and into active washes where they would be lost from the seed bank.
英文关键词	antitelechory Astragalus holmgreniorum endemic hygrochasy informed dispersal Mojave Desert seed predators wind dispersal water dispersal
类型	Article
语种	英语
国家	USA
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000535696100001
WOS关键词	SEED DISPERSAL ; ASTRAGALUS-HOLMGRENIORUM ; INFORMED DISPERSAL ; CONSEQUENCES ; EVOLUTION ; DYNAMICS ; PATTERNS ; DORMANCY ; ABILITY ; RARE
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/2XILL650/318681
作者单位	1.Utah Valley Univ, Dept Biol, 800 W Univ Pkwy, Orem, UT 84058 USA; 2.US Forest Serv, USDA, Rocky Mt Res Stn, Shrub Sci Lab, 735 North 500 East, Provo, UT 84606 USA
推荐引用方式 GB/T 7714	Houghton, Sydney,Stevens, Michael T.,Meyer, Susan E.. Pods as sails but not as boats: dispersal ecology of a habitat-restricted desert milkvetch[J],2020,107(6):864-875.
APA	Houghton, Sydney,Stevens, Michael T.,&Meyer, Susan E..(2020).Pods as sails but not as boats: dispersal ecology of a habitat-restricted desert milkvetch.AMERICAN JOURNAL OF BOTANY,107(6),864-875.
MLA	Houghton, Sydney,et al."Pods as sails but not as boats: dispersal ecology of a habitat-restricted desert milkvetch".AMERICAN JOURNAL OF BOTANY 107.6(2020):864-875.