Variation in age and height of onset of reproduction in the saguaro cactus (Carnegiea gigantea) in the Sonoran Desert

Plant Ecology ◽  
2007 ◽  
Vol 194 (2) ◽  
pp. 223-229 ◽  
Author(s):  
Taly Dawn Drezner
Keyword(s):  
Sonoran Desert ◽  
Carnegiea Gigantea

scholarly journals Potential changes in the distribution of Carnegiea gigantea under future scenarios

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5623 ◽  
Author(s):  
Fabio Albuquerque ◽  
Blas Benito ◽  
Miguel Ángel Macias Rodriguez ◽  
Caitlin Gray
Keyword(s):  
Climate Change ◽  
Habitat Suitability ◽  
Sonoran Desert ◽  
Potential Effect ◽  
Desert Ecosystem ◽  
Suitable Habitat ◽  
Desert Ecosystems ◽  
Carnegiea Gigantea ◽  
Abiotic Variables ◽  
Impacts Of Climate Change

Over the last decades several studies have identified that the directional changes in climate induced by anthropogenic emissions of greenhouse gases are affecting the ecology of desert ecosystems. In the Southwest United States, the impacts of climate change to plant abundance and distribution have already been reported, including in the Sonoran Desert ecosystem, home of the iconic Saguaro (Carnegiea gigantea). Hence, there is an urgent need to assess the potential impacts of climate change on the saguaro. The goals of this study are to provide a map of actual habitat suitability (1), describe the relationships between abiotic predictors and the saguaro distribution at regional extents (2), and describe the potential effect of climate change on the spatial distribution of the saguaro (3). Species Distribution Modeling (SDM) was used to investigate the relationships between abiotic variables and the Saguaro distribution. SDMs were calibrated using presence records, 2,000 randomly-generated pseudo absences, and ten abiotic variables. Of these, annual precipitation and max temperature of the warmest month was found to have the greatest relative influence on saguaro distribution. SDMs indicated that 6.9% and 8.1% of the current suitable habitat is predicted to be lost by 2050 and 2070, respectively. Therefore, predicted changes in climate may result in a substantial contraction of the suitable habitat for saguaro over the next century. By identifying the drivers of saguaro distribution and assessing potential changes in habitat suitability due to climate change, this study will help practitioners to design more comprehensive strategies to conserve the saguaro in the face of climate change.

Population dynamics of Sonoran Desert saguaro cactus (Carnegiea gigantea) at the Desert Laboratory (Tucson, Arizona)

Ecology ◽  
2013 ◽  
Vol 94 (7) ◽  
pp. 1660 ◽  
Author(s):  
Susana Rodriguez-Buritica ◽  
Helen Raichle ◽  
Trevor Birt ◽  
Robert H. Webb ◽  
Raymond M. Turner ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Sonoran Desert ◽  
Carnegiea Gigantea

Demographic changes over >70 yr in a population of saguaro cacti ( Carnegiea gigantea ) in the northern Sonoran Desert

2017 ◽  
Vol 139 ◽  
pp. 41-48 ◽  
Author(s):  
Joshua L. Conver ◽  
Theresa Foley ◽  
Daniel E. Winkler ◽  
Don E. Swann
Keyword(s):  
Sonoran Desert ◽  
Demographic Changes ◽  
Carnegiea Gigantea

Influence of Selected Endomycorrhizae from the Sonoran Desert and Glomus intraradices on Growth Response and Gas Exchange of Hibiscus rosa-sinensis L. cv. Leprechaun

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 501d-501
Author(s):  
Jonathan N. Egilla ◽  
Fred T. Davies
Keyword(s):  
Gas Exchange ◽  
Sonoran Desert ◽  
Growth Response ◽  
Glomus Intraradices ◽  
Root Colonization ◽  
Gas Exchange Parameters ◽  
Hibiscus Rosa Sinensis ◽  
Low Phosphorus ◽  
The Relationship ◽  
Exchange Parameters

Six endomycorrhiza isolates from the Sonoran Desert of Mexico [Desert-14(18)1, 15(9)1, 15(15)1, Palo Fierro, Sonoran, and G. geosporum] were evaluated with a pure isolate of Glomus intraradices for their effect on the growth and gas exchange of Hibiscus rosa-sinensis L. cv. Leprechaun under low phosphorus fertility (11 mg P/L). Rooted cuttings of Hibiscus plants were inoculated with the seven mycorrhiza isolates and grown for 122 days. Gas exchange measurements were made on days 26, 88, and 122 after inoculation, and plants were harvested on day 123 for growth analysis. Plants inoculated with the seven isolates had 70% to 80% root colonization at harvest. Plants inoculated with G. intraradices had significantly higher leaf, shoot and root dry matter (DM), leaf DM/area (P ≤ 0.05) than those inoculated with any of the six isolates, and greater leaf area (LA) than Desert-15(9)1 and 15(15)1. Uninoculated plants had significantly lower leaf, shoot, root DM, leaf DM/area and LA (P ≤ 0.05) than the inoculated plants. There were no differences among the seven isolates in any of the gas exchange parameters measured [photosynthesis (A) stomatal conductance (gs), the ratio of intercellular to external CO2 (ci/ca), A to transpiration (E) ratio (A/E)]. The relationship between inoculated and uninoculated plants in these gas exchange parameters were variable on day 122 after inoculation.

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