Mapping of the Alameda and Peninsula Watersheds

Invasive Plant Inventory and Mapping of the Alameda and Peninsula Watersheds

Nomad Ecology conducted invasive plant mapping and prepared Invasive Plant Management Plans for the approximately 23,000-acre Peninsula Watershed and the approximately 36,000-acre Alameda Watershed. In 2008, baseline invasive plant surveys were conducted and results and recommendations of those surveys were included in a report. In 2019, Nomad surveyed both watersheds again to update the invasive weed map and identify priority populations for control. The purpose of the project was to strategically address invasive weeds in the Peninsula and Alameda watersheds, using an Adaptive Management Approach based on setting goals, prioritizing species and populations for control, and following up control with monitoring. A total of 73 invasive plant species were mapped in the Peninsula Watershed in 2019. A total of 52 invasive plant species were mapped with a total of 3,193 data points in the Alameda Watershed.

The Invasive Plant Management Plans provide: background on the Peninsula and Alameda watersheds, invasive plant survey methodology, a summary of invasive weed species mapped in 2008 and 2019, species-based and site-based prioritization of invasive plant populations for management based on 2008 and 2019 data, and management recommendations.


Location: Alameda and Santa Clara Counties
Client: San Francisco Public Utilities Commission

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