Columnar cacti-shrub relationships in an Andean semiarid valley in western Venezuela

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	Columnar cacti-shrub relationships in an Andean semiarid valley in western Venezuela
	Larrea-Alcazar, D. M.
刊名	Plant Ecology
	2008
卷号	196 期号:2 页码:153-161
ISSN号	1385-0237
中文摘要	Spatial associations between columnar cacti and mimosoid shrubs were evaluated in an Andean semidesert enclave. An analysis on the capacity of other deciduous shrub species and medium-sized ephemeral plants to modify the spatial distribution of cacti was also included. The number of Stenocereus griseus (Haw.) F. Buxb., Cereus repandus (L.) Backeb. and Pilosocereus tillianus Gruber & Schaftzl that grow below the canopies of perennial plants were assessed and compared with open areas. Comparison of observed and expected number of cactus individuals shows a positive spatial association between S. griseus and Prosopis juliflora DC. Moreover, abundance of C. repandus and P. tillianus under the canopies of mimosoid shrubs were not statistically different from what was expected by chance. Positive spatial association between S. griseus and Capparis odoratissima Jacq., Cassia emarginata L., Cordia curassavica (Jacq.) Roem. & Schult., Croton rhamnifolius H.B.K. and Jatropha gossypifolia L. was also found. Evidence suggests that positive columnar cacti-shrub spatial association may occur either in the cactus thickets or in the thornscrubs. Due to the clumped distributions of S. griseus beneath P. juliflora and other perennial plants, we here postulate that S. griseus is the primary nursed columnar cactus of the enclave. The presence of cacti in open areas suggests that facilitation may be less important for establishment of columnar cacti species in this Andean semidesert landscape than in other temperate and tropical semiarid zones. We here discuss the importance of the nurse syndrome phenomenon for recruitment of S. griseus and for the conservation of this Andean semiarid environment.
公开日期	2015-01-28
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/8002]
专题	西双版纳热带植物园_热带植物资源可持续利用重点实验室特色文献_小桐子相关文献
推荐引用方式 GB/T 7714	Larrea-Alcazar, D. M.. Columnar cacti-shrub relationships in an Andean semiarid valley in western Venezuela[J]. Plant Ecology,2008,196(2):153-161.
APA	Larrea-Alcazar, D. M..(2008).Columnar cacti-shrub relationships in an Andean semiarid valley in western Venezuela.Plant Ecology,196(2),153-161.
MLA	Larrea-Alcazar, D. M.."Columnar cacti-shrub relationships in an Andean semiarid valley in western Venezuela".Plant Ecology 196.2(2008):153-161.