Stem Surface Injuries of Several Species of Columnar Cacti of Ecuador 1
Evans L and Macri AA. 2008. Stem Surface Injuries of Several Species of Columnar Cacti of Ecuador 1. The Joumal of the Torrey Botanical Society 475-482
Summary and abstract of research article describing identical scale and bark injuries on columnar cacti in North and South America. For 16 species, areas with scale and bark injuries on stems were greater on equatorial-facing surfaces (east and west facing) than on polar-facing surfaces (north and south facing). Moreover, percentages of stem areas with injuries were well correlated with relative amounts of annual sunlight exposure. Cacti with high levels of scale and bark injuries had high levels of mortality. The data of this study show that at least 20 species of long-lived columnar cactus species in the Americas have almost identical scale and bark injuries even though they exist from 32° N to 32° S. Ratios of equatorial vs. polar injuries are well correlated with ratios of PAR (photosynthetically active radiation) for equatorial and polar surfaces.
- Type
- Generic Document
- Authors
- Evans, Lance; Macri, Annarita
- Date of Issue
- 2008
- Publisher
- The Joumal of the Torrey Botanical Society 475-482
- Units
- SAGU
- Keywords
- bark injuries, columnar cacti, equatorial facing, equatorial injuries, photosynthetically active radiation, polar facing, polar injuries, stem surface injuries