The keystone saguaro (Carnegiea gigantea, Cactaceae): a review of its ecology, associations, reproduction, limits, and demographics

@article{Drezner2014TheKS,
  title={The keystone saguaro (Carnegiea gigantea, Cactaceae): a review of its ecology, associations, reproduction, limits, and demographics},
  author={Taly Dawn Drezner},
  journal={Plant Ecology},
  year={2014},
  volume={215},
  pages={581-595}
}
  • T. Drezner
  • Published 10 April 2014
  • Environmental Science
  • Plant Ecology
This paper reviews the basics of a Sonoran Desert keystone cactus species, including the ecology of its establishment and high mortality, its association with nurse plants to provide ameliorated conditions for survival, and variability in longevity and reproduction over its range such as delayed reproduction in hotter and more arid populations where this delay is met with longer lifespans. The production of flowers, branches, and spines from areoles is reviewed, as well as current methods for… 
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References

SHOWING 1-10 OF 142 REFERENCES
Variability in reproductive effort of a keystone species: age and height of branch establishment
TLDR
Of greatest concern is the advanced age at which branching begins at the most marginal, arid site, which is around the same time that old-age mortality may set in for the species (generally), dramatically diminishing reproductive output in an already marginal population.
Climatic Controls of Saguaro (Carnegiea Gigantea) Regeneration: A Potential Link With El Niño
Saguaro cacti establish periodically in cohorts during years that are climatically favorable. Determining the establishment year is complicated by age-height relationships that vary considerably from
The Population Dynamics of Columnar and Other Cacti: A Review
In this article, we review the population cycles of cacti, with an emphasis on the large, often keystone columnar cacti of the North American deserts. These and many other cacti often experience
Saguaro (Carnegiea Gigantea) Densities and Reproduction Over the Northern Sonoran Desert
TLDR
The partial correlation results suggest that high saguaro densities are linked with high quality nurse cover in addition to summer rainfall, and total cover and mean annual precipitation are the best predictors of reproductive stem density.
Demographic patterns of Ferocactus cylindraceus in relation to substrate age and grazing history
TLDR
Three subpopulations of Ferocactus cylindraceus, a short-columnar cactus of the Sonoran and Mojave deserts, were sampled in Grand Canyon, Arizona, USA, at sites representing a range of substrate ages and different grazing histories, indicating that as for many woody plants in arid regions, somewhat unusual climatic conditions are necessary if populations are to replace themselves.
The regeneration of a protected Sonoran Desert cactus since 1800 A.D. over 50,000 km2 of its range
TLDR
This is the first study to look at the long-term regeneration of the saguaro cactus over an area of more than 50,000 km2, nearly the US portion of its range, and suggests that over the long term, the population is quite stable.
How long does the giant saguaro live? Life, death and reproduction in the desert
Saguaro Distribution under Nurse Plants in Arizona's Sonoran Desert: Directional and Microclimate Influences*
Abstract The saguaro cactus, an icon of the American southwestern desert, defines the extent of the Sonoran Desert through portions of its range. Saguaros rely upon nurse plants for establishment and
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