San Diego River Coastal Sage Scrub Restoration Project: A Southern California Climate Change Adaptation Case Study
Climate change may affect the ability to achieve on-the-ground project goals and objectives. The following case study demonstrates how climate change vulnerability and adaptation information can be integrated into existing and future habitat restoration projects to increase overall project resilience. For this example, resource managers and regional stakeholders worked together to evaluate: 1) how climate and non-climate vulnerabilities could impact the ability to achieve project goals, 2) what current project actions help to address or minimize vulnerabilities, and 3) what new actions could be added to the project to address remaining vulnerabilities. While this specific project has already been completed, restoring native species is a common activity in southern California sage scrub habitats, and this type of process could easily be replicated in future habitat restoration projects.
San Diego River Coastal Sage Scrub Restoration Project Goals & Actions
The Forest Service restored a 25-acre area of coastal sage scrub habitat located upslope of the San Diego River within the Cleveland National Forest. Following several recent wildfires, the project area had become dominated by catclaw acacia (Senegalia greggii) and non-native grasses.
The goal of this project was to restore the site in order to provide suitable habitat for the threatened California gnatcatcher (Polioptila californica) by increasing canopy cover, shrub height, and species richness.
The Forest Service revegetated the project area with a diverse mixture of native species that would provide suitable habitat structure and diversity for the California gnatcatcher. Primary project actions included:
Seeding the site across multiple years with a mixture of drought-tolerant shrubs
Controlling non-native plants using mechanical and chemical treatments for up to four years
Monitoring vegetative cover, shrub height, and species richness yearly
Kershner, J.M., L.E. Hilberg, and W.A. Reynier. 2017. San Diego River Coastal Sage Scrub Restoration Project: A Southern California Climate Change Adaptation Case Study. Retrieved from CAKE: http://www.cakex.org/case-studies/san-diego-river-coastal-sage-scrub-res...