A test of the relationship between seasonal rainfall and saguaro cacti branching patterns

  title={A test of the relationship between seasonal rainfall and saguaro cacti branching patterns},
  author={Taly Dawn Drezner},
  • T. Drezner
  • Published 1 August 2003
  • Environmental Science
  • Ecography
Reproductive output, as well as photosynthetically active radiation interception and CO 2 uptake, increase as saguaro cacti Carnegiea gigantea (Engelm.) Britt. and Rose branch, and branching increases with increasing moisture. The Sonoran Desert experiences distinct summer and winter precipitation regimes that vary in both geography and scale. Many aspects of saguaro ecology are known to depend on the summer rains, which has resulted in an emphasis on summer rains in the literature. Similarly… 
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) 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.
Vegetation, Climate, and Soil Relationships Across the Sonoran Desert
Abstract: The distribution and abundance of dominant species and their relationships with soil and climate were investigated using a variety of multivariate statistics across 30 plots that spanned 50
Nonlinear modeling of saguaro growth rates reveals the importance of temperature for size-dependent growth.
The most parsimonious model was the Ricker function that described growth considering cactus decline with age, and Variance in temperature, rather than precipitation, was more closely related to growth.
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.
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
Stable Isotopes in the Spines of Columnar Cactus: a New Proxy for Climate and Ecophysiological Research
There are relatively few annually resolved climate proxies in arid and semi-arid regions. Columnar cactuses are common in these regions and the stable isotopes of carbon and oxygen in durable spines


Height Distributions of Two Species of Cacti in Relation to Rainfall, Seedling Establishment, and Growth
In three populations of Ferocactus acanthodes and two of Carnegiea gigantea, multiple discrete peaks in the height distribution were observed, suggesting that seedling establishment was intermittent, and the pattern of such suitable years over the last 3 decades correlated with the measured height distributions.
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
The Influence of Shade, Soil, and Water on Saguaro Seedling Establishment
Saguaro populations, it was concluded, will be strongly influenced by forces which alter the number of shade-producing perennial plants with which the saguaro grows-forces like grazing and climatic change.
The model indicated that the observed higher frequency of branches on the south side of the trunk of C. gigantea had only a slight, though positive, effect on CO2 uptake for single-branched plants, and the stems must be arranged to avoid excessive self-shading and thus keep the area below PAR compensation small.
Winter climate and atmospheric circulation patterns in the Sonoran desert region, USA
The goal of this research is to identify key features of atmospheric circulation that influence winter climate variability in the Sonoran Desert region, and to determine how much variability in
Number of winter precipitation days reconstructed from southwestern tree rings
Abstract The potential of reconstructing the number of winter precipitation days from tree-rings in the southwestern United States is explored in this study. This variable, an alternative to the
The Influence of Insolation on the Distribution and on the Developmental Sequence of the Flowers of the Giant Cactus of Arizona
The Sonoran giant cactus, Carnegiea gigantea, occurs in southern Arizona and in Sonora, Mexico, down to the Yaqui River and this study was initiated during a stay at the Desert Laboratory and was aided by a grant from the Department of Botanical Research, Carnegie Institution of Washington.
Effect of Nurse Plants on the Microhabitat and Growth of Cacti
Nurse plants facilitate seedling establishment by reducing high temperatures near the soil surface and provide a microhabitat with a higher soil nitrogen level, however, shading and competition for water with the nurse plants markedly reduce seedling growth.