Jump to main content.

Research Project Search
 Enter Search Term:
   
 NCER Advanced Search

Quantifying the Impact of Invasive Plants in California Grassland Systems and Facilitating Conservation Strategies

EPA Grant Number: FP916389
Title: Quantifying the Impact of Invasive Plants in California Grassland Systems and Facilitating Conservation Strategies
Investigators: Hulvey, Kristin B.
Institution: University of California - Santa Cruz
EPA Project Officer: Graham, Karen
Project Period: January 1, 2004 through December 31, 2006
Project Amount: $107,762
RFA: STAR Graduate Fellowships (2004)
Research Category: Fellowship - Terrestrial Ecology and Ecosystems , Ecological Indicators/Assessment/Restoration , Academic Fellowships

Description:

Objective:

Diversity-invasibility investigations are of conservation interest because increasing rates of biological invasion may create positive feedback cycles of: biological invasion→ diversity loss→ ecosystem simplification→ invasion susceptibility. A better understanding of when and how invaders impact natural systems may prevent ecosystem services losses, decreases in biodiversity, and subsequent changes in ecosystem functioning. The objective of this research is to investigate the susceptibility of California grasslands to invasive plants by examining the effect of absolute and functional diversity changes on invader impact. I will build on past invasion-diversity experiments by: (1) focusing on invader impacts as well as invader establishment; (2) using as treatments the known, nested variation of species and functional group diversity found in California grasslands rather than using random assemblages of species as treatments; and (3) investigating impacts of invaders at two ecological scales, population and ecosystem levels.

Approach:

Nested diversity plots will be constructed in California grassland through removal and replanting of appropriate grassland species for each diversity level. After 1 year of growth, two common noxious weeds with differing functional characteristics, yellow starthistle (Centaurea soltitialis) and medusahead (Taeniatherum caput-medusae), will be introduced to the plots as experimental invaders. The abundance, cover, and biomass of all species will be measured yearly to determine the population and ecosystem impacts of yellow starthistle and medusahead. Throughout this investigation, I will work with land managers and policy makers to help translate study findings into effective methods of yellow starthistle and medusahead control.

Supplemental Keywords:

fellowship, biodiversity, invasive species, natural ecosystems, California, grasslands, population dynamics, weeds, yellow starthistle, medusahead , Ecosystem Protection/Environmental Exposure & Risk, ENVIRONMENTAL MANAGEMENT, Scientific Discipline, RFA, Ecosystem/Assessment/Indicators, Ecological Risk Assessment, Ecological Indicators, Ecological Effects - Environmental Exposure & Risk, Ecosystem Protection, Environmental Monitoring, Resources Management, conservation, ecosystem assessment, ecosystem integrity, environmental risks, invasive species, changes in species composition, yellow starthistle, biodiversity
Relevant Websites:

2004 STAR Graduate Fellowship Conference Poster (PDF, 1p., 163KB, about PDF)

Top of page

The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

Local Navigation

Jump to main content.