Arid
DOI10.1002/ecs2.1937
Floral orientation in Eulychnia acida, an arborescent cactus of the Atacama Desert, and implications for cacti globally
Warren, Steven D.1; Aguilera, Lorgio E.2; Scott Baggett, L.3; Zuniga, Mauricio2
通讯作者Warren, Steven D.
来源期刊ECOSPHERE
ISSN2150-8925
出版年2017
卷号8期号:10
英文摘要

The hyperarid Atacama Desert of northern Chile may be the driest place on Earth. Plants surviving there have adapted a number of unique strategies to cope with the harsh conditions. Many cacti in arid areas tend to produce reproductive organs in positions that maximize incidence of solar radiation. We sought to determine whether Eulychnia acida, an endemic cactus with an arborescent growth form, follows the same pattern. We conducted a study in two populations of the cactus. One population occurs where average annual precipitation (AAP) is 113 mm; AAP at the other site is 50 mm. We randomly sampled 10 plants at each location, and 300 reproductive structures on those plants. On each plant, we recorded the position of all reproductive organs relative to the center of the plant, and relative to the center of the stems on which they were located. The results of the two populations did not differ significantly, so results of the two populations were combined. Both populations lie south of the Tropic of Capricorn, beyond the point where the sun reaches its southernmost zenith. Hence, the sun is located at to the north all year long. We discovered that the reproductive tissue emerges predominantly on stems found the equatorial (north) side of the plant and on the equatorial (north) side of those stems. As reproduction is energetically expensive, the generation of reproductive organs from vegetative tissue that receives high levels of direct solar radiation minimizes the cost of translocating photosynthates from photosynthetic tissue to non-photosynthetic reproductive tissue, thus begetting energetic efficiency. The strategy appears to be common among many cacti and in some other plants of arid regions worldwide and is especially prevalent at extra-tropical latitudes. In addition to nectar rewards, the strategy may also benefit pollinators by offering a thermal reward, especially on overcast or otherwise cool days, thus improving the odds of successful pollination.


英文关键词copao energetic efficiency equatorial orientation Eulychnia acida flowers hyperaridity
类型Article
语种英语
国家USA ; Chile
收录类别SCI-E
WOS记录号WOS:000414070800013
WOS关键词CEPHALOCEREUS-COLUMNA-TRAJANI ; FLOWER ORIENTATION ; PSEUDOCEPHALIUM ORIENTATION ; CACTACEAE ; PHIL. ; TEMPERATURE ; DIVERSITY ; RADIATION ; COMMUNITY ; CEPHALIUM
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198551
作者单位1.US Forest Serv, Rocky Mt Res Stn, Shrub Sci Lab, 735 North 500 East, Provo, UT 84606 USA;
2.Univ La Serena, Dept Biol, La Serena, Chile;
3.US Forest Serv, Rocky Mt Res Stn, 240 West Prospect Rd, Ft Collins, CO 80526 USA
推荐引用方式
GB/T 7714
Warren, Steven D.,Aguilera, Lorgio E.,Scott Baggett, L.,et al. Floral orientation in Eulychnia acida, an arborescent cactus of the Atacama Desert, and implications for cacti globally[J],2017,8(10).
APA Warren, Steven D.,Aguilera, Lorgio E.,Scott Baggett, L.,&Zuniga, Mauricio.(2017).Floral orientation in Eulychnia acida, an arborescent cactus of the Atacama Desert, and implications for cacti globally.ECOSPHERE,8(10).
MLA Warren, Steven D.,et al."Floral orientation in Eulychnia acida, an arborescent cactus of the Atacama Desert, and implications for cacti globally".ECOSPHERE 8.10(2017).
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