Recruiting mechanisms of Cylindropuntia leptocaulis (Cactaceae) in the Southern Chihuahuan Desert

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• 作者：A. Flores-Torres ; C. Monta&ntilde ; a ; ^{carlos.montana@inecol.edu.mx}
• 关键词：Clonal propagation ; Facilitation ; Larrea tridentata ; Mexico ; Nurse plant ; Sexual reproduction
• 刊名：Journal of Arid Environments
• 出版年：2012
• 期刊代码：93_01401963
• 类别：ear
• 出版时间：September, 2012
• 卷：84
• 期：Complete
• 页码：63-70
• 文件大小：263 K

摘要

Sexual reproduction and vegetative propagation require the establishment of morphologically diverse reproductive structures (seedlings and stem segments). This study assesses both types of Cylindropuntia leptocaulis recruitment in two microenvironments protected from herbivory (in open space and under the canopy of Larrea tridentata) and with two soil types (collected below L.聽tridentata canopy and from open space).

An observational study revealed that sexual establishment was very limited (only 8 juveniles/ha were found), while clonal establishment was more frequent (59 juveniles/ha); both types of propagule were found only under shrub canopy.

Field experiments showed that, as in other Cylindropuntia species but contrasting with findings for Opuntia species, seeds germinated and seedlings survived under nurse plants as well as in open space, but they grew faster in the former environment. Faster growth under canopy shade provides better chances of successful recruitment to later life-cycle stages. Stem segments never established in open space, requiring the shade of nurse plants. This may be due to physiological constraints imposed by their small volume. In synthesis, the results indicate that clonal propagation is the most important recruitment mechanism in C.聽leptocaulis populations, and that it takes places under shrub canopy.