Regeneration of Carnegiea gigantea (Cactaceae) since 1850 in three populations in the northern Sonoran Desert

  title={Regeneration of Carnegiea gigantea (Cactaceae) since 1850 in three populations in the northern Sonoran Desert},
  author={Taly Dawn Drezner},
  journal={Acta Oecologica-international Journal of Ecology},
  • T. Drezner
  • Published 1 March 2006
  • Environmental Science
  • Acta Oecologica-international Journal of Ecology
The keystone saguaro (Carnegiea gigantea, Cactaceae): a review of its ecology, associations, reproduction, limits, and demographics
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
Variability in reproductive effort of a keystone species: age and height of branch establishment
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.
Regeneration cycles of the keystone species Carnegiea gigantea are linked to worldwide volcanism
It is suggested that while different populations are influenced by temporary global temperature ameliorations to different extents, the results show that populations do derive significant benefits from volcanic eruptions that promote their regeneration over large portions of their range.
Regional Branching Relationships in Carnegiea gigantea, A Keystone Cactus
A significant relationship in peaks and troughs is detected between the 2 very different populations, suggesting a regional influence over branching that extends beyond a population or local area.
Saguaro (Carnegiea Gigantea) Densities and Reproduction Over the Northern Sonoran Desert
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.
Variation in age and height of onset of reproduction in the saguaro cactus (Carnegiea gigantea) in the Sonoran Desert
Statistical results are robust and significant variations in the onset of reproduction are observed by both age and height across the four sites, which have implications for regeneration, particularly in marginal locales where regeneration is already limited.
The interaction of drought and habitat explain space-time patterns of establishment in saguaro (Carnegiea gigantea).
Saguaro establishment was best explained by the interaction of drought and habitat type; establishment in bajada and foothill plots dropped to near-zero under the most severe periods of water limitation but remained higher in slope plots during the same time span, and data suggest that the most suitable habitat type for saguaroestablishment shifted to higher elevations during the time span of the recent drought.
Episodic recruitment in the saguaro cactus is driven by multidecadal periodicities.
It is found that saguaros rely on multidecadal periodic pulses of good beneficial years to incorporate new individuals into their populations with periodicities of 20-30 years possibly related to strong El Niño Southern Oscillation events.


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
Saguaro (Carnegiea gigantea, Cactaceae) age-height relationships and growth: the development of a general growth curve.
  • T. Drezner
  • Environmental Science
    American journal of botany
  • 2003
With this formula and relatively little field sampling, the age of any individual saguaro (whether the individual was sampled or not) in any population can be estimated.
Demographic patterns of Ferocactus cylindraceus in relation to substrate age and grazing history
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.
Demography of the columnar cactus Neobuxbaumia macrocephala: a comparative approach using population projection matrices
This study analyzes the N. macrocephala demographic pattern using a projection matrix in order to determine the main limiting factors of this columnar cactus, and compares its results with those obtained for another species of the same genus, N. tetetzo.
Long‐Term Vegetation Change at a Fully Protected Sonoran Desert Site
An open-ended study of a site that offers a combination of multiple observations through time with continuous protection from domestic livestock and other human impacts finds desert vegetation dynamics are highly responsive to changes in the climate regime under which they grow.
Biotic interactions and the population dynamics of the long-lived columnar cactus Neobuxbaumia tetetzo in the Tehuacán Valley, Mexico
Elasticity analysis showed that survivorship was the most important life-history parameter to the finite rate of increase and the critical stages of the life cycle that were related to the biotic interactions occurring during these stages.
A proposal for conservation of exemplary stands of the giant cardon cactus (Pachycereus pringlei [S. Wats] Britt. and Rose) in Baja California Sur, Mexico
Natural Areas Journal 20.197-200 ABSTRACT: Four sites in the state of Baja California Sur, Mexico, support superb stands of the giant columnar cardon cactus (Pachycereus pringlei [S. Wats] Britt. &
Climatic Effects on Regeneration Trends for Two Columnar Cacti in the Northern Sonoran Desert
Abstract A traditional perception of desert vegetation is one of relatively slow change in a consistently harsh environment. More recent studies of population dynamics and paleoenvironmental