A gradient analysis of Coleogyne communities in Southern Nevada

Species richness, density, and abundance in Coleogyne ramosissima (blackbrush) shrublands were compared on 15 elevational transects in the Spring and Sheep Mountain Ranges adjacent to the Las Vegas Valley. Coleogyne shrublands shared relatively broad upper and lower ecotones with Pinus-Juniperus and Larrea-Ambrosia vegetation, respectively. Lower Coleogyne ecotones generally had the highest species richness, and Pinus-Juniperus woodlands had the lowest species richness; Detrended correspondence analysis (DECORANA) suggested that elevation and soil depth were significantly associated with the distribution of stand and species groups identified from two-way indicator species analysis (TWINSPAN) in the Spring and Sheep Mountain Ranges. Precipitation and soil moisture were positively correlated with elevation; air and soil temperatures were negatively correlated with elevation; Coleogyne density was positively correlated with soil moisture, soil organic matter, Coleogyne water potential, Coleogyne leaf biomass, and Coleogyne stem and leaf phosphorus. Soil moisture and soil organic matter appeared to influence the distribution of Coleogyne at its lower elevational boundary in southern Nevada.

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Biological Science

Grantor dc:publisher

University of Nevada, Las Vegas

Year

1995

Author dc:creator

• Lei, Simon Adams

Contributors dc:contributor

• Lawrence R. Walker

Statement dc:rights

• IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

Language dc:language

English

Identifier

https://oasis.library.unlv.edu/rtds/464

OAI identifier oai:identifier

oai:oasis.library.unlv.edu:rtds-1463