Dissertation/Thesis Abstract

Predicting slender false brome (<i>Brachypodium sylvaticum </i>) invasion in the Santa Cruz Mountains, California
by Bird, Janine E., M.A., San Jose State University, 2013, 56; 1547084
Abstract (Summary)

Early detection of an invasive species facilitates control and eradication. Slender false brome (Brachypodium sylvaticum) was first discovered in the Santa Cruz Mountains of Central California in 2003 as a non-native grass in redwood forests, competing with native vegetation. The current infestation in the Santa Cruz Mountains, estimated to be 300 acres, is concentrated in San Mateo County and could be eradicated. This study sought to determine most likely locations of slender false brome in the Santa Cruz Mountains by assessing environmental attributes of known presence locations using species distribution modeling and Maxent software. The study used 1,320 species presence points collected in field surveys conducted from 2009 to 2012, GIS environmental layers covering a 940 km2 study area, and the machine-learning program Maxent to identify slender false brome habitat at a 30 m resolution in the Santa Cruz Mountains. Maxent models successfully identified locations of potential distribution of slender false brome (training AUC = 0.961, test AUC = 0.960). Annual precipitation, average annual maximum or minimum temperature, and soils were the most important predictors. An independent dataset corroborated the performance of the Maxent model. Maxent could be used by land managers for targeting field surveys by predicting most likely B. sylvaticum habitat in the Santa Cruz Mountains.

Indexing (document details)
Advisor: Taketa, Richard
Commitee: Davis, M. Kathryn, Powell, Cynthia
School: San Jose State University
Department: Geography
School Location: United States -- California
Source: MAI 52/03M(E), Masters Abstracts International
Subjects: Wildlife Management, Plant biology, Geography, Plant sciences
Keywords: Biological invasions, Brachypodium sylvaticum, Exotic species, Invasive plants, Maxent, Species distribution modeling, Vegetation
Publication Number: 1547084
ISBN: 9781303479359