Arid
DOI10.1002/ecs2.1596/full
Caching rodents disproportionately disperse seed beneath invasive grass
Sommers, Pacifica1,2; Chesson, Peter1
通讯作者Sommers, Pacifica
来源期刊ECOSPHERE
ISSN2150-8925
出版年2016
卷号7期号:12
英文摘要

Seed dispersal by caching rodents is a context-dependent mutualism in many systems. Plants benefit when seed remaining in shallow caches germinates before being eaten, often gaining protection from beetles and a favorable microsite in the process. Caching in highly unfavorable microsites, conversely, could undermine the dispersal benefit for the plant. Plant invasions could disrupt dispersal benefits of seed caching by attracting rodents to the protection of a dense invasive canopy which inhibits the establishment of native seedlings beneath it. To determine whether rodents disproportionately cache seed under the dense canopy of an invasive grass in southeastern Arizona, we used nontoxic fluorescent powder and ultraviolet light to locate caches of seed offered to rodents in the field. We fitted a general habitat-use model, which showed that disproportionate use of plant cover by caching rodents (principally Chaetodipus spp.) increased with moonlight. Across all moon phases, when rodents cached under plants, they cached under the invasive grass disproportionately to its relative cover. A greenhouse experiment showed that proximity to the invasive grass reduced the growth and survival of seedlings of a common native tree (Parkinsonia microphylla) whose seeds are dispersed by caching rodents. Biased dispersal of native seed to the base of an invasive grass could magnify the competitive effect of this grass on native plants, further reducing their recruitment and magnifying the effect of the invasion.


英文关键词cache Chaetodipus baileyi Chaetodipus intermedius Heteromyidae invasion mutualism disruption Neotoma albigula Parkinsonia microphylla Pennisetum ciliare predator avoidance seed dispersal Sonoran Desert
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000390136700025
WOS关键词HOARDING BEHAVIOR ; KANGAROO RATS ; PREDATION ; COMPETITION ; PREFERENCE ; ABUNDANCE ; SELECTION ; SAVANNA ; CLIMATE ; IMPACT
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构University of Arizona
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/192509
作者单位1.Univ Arizona, Ecol & Evolutionary Biol, Tucson, AZ 85721 USA;
2.Univ Colorado, Ecol & Evolutionary Biol, Boulder, CO 80309 USA
推荐引用方式
GB/T 7714
Sommers, Pacifica,Chesson, Peter. Caching rodents disproportionately disperse seed beneath invasive grass[J]. University of Arizona,2016,7(12).
APA Sommers, Pacifica,&Chesson, Peter.(2016).Caching rodents disproportionately disperse seed beneath invasive grass.ECOSPHERE,7(12).
MLA Sommers, Pacifica,et al."Caching rodents disproportionately disperse seed beneath invasive grass".ECOSPHERE 7.12(2016).
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