San Diego Management & Monitoring Program


Rare Plants
Enhancing the Resilience of Edaphic Endemic Plants

- June 19, 2018 completed

Project description

The Management Strategic Plan for San Diego County requires prioritization and management for edaphic endemic plants, including the five rare plants addressed in this study. These species face low genetic diversity due to reduced population sizes, geographic isolation, and loss of pollinators. To enhance the resilience of these species across their ranges, we must manage threats to increase population sizes, identify potentially suitable habitat to connect existing populations, find or restore new populations, and provide opportunities for shifting distributions due to climate change. This study identifies and describes geographic areas that support the five edaphic endemic species and their habitat in a design that enhances resilience and provides opportunities for shifting distributions. We developed conceptual models to inform field studies and management, refined soils and vegetation attributes, and assessed regional population structure and threats. We used results to suggest prioritized locations for surveys, management, potential translocation, and additional conservation or acquisition. Project partners (U.S. Geological Survey and San Diego Management and Monitoring Program) modeled suitable habitat for the target species under current and future climate scenarios; we reference models as appropriate.


Project protocol

Name: No protocol available at this time


Project spatial boundary

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Project focus

Project type: General Management

Target species: Dehesa nolina, Otay tarplant, Parry's tetracoccus, San Diego thorn-mint, Thread-leaved brodiaea

Target vegetation: chaparral, coastal sage scrub, grassland


Implementing entities

Data steward: Emily Perkins

Investigator: Patricia Gordon-Reedy

Main implementing entity: Conservation Biology Institute

Partner: A & L Western Laboratories; California Department of Fish & Wildlife; San Diego Management and Monitoring Program; San Diego State University; Space and Naval Warfare Systems Command (SPAWAR); The Nature Conservancy; U.S. Fish and Wildlife Service; U.S. Geological Survey

Point of contact: Patricia Gordon-Reedy; Spring Strahm

SDMMP lead: Sarah McCutcheon

Study lead: Spring Strahm


Files and documents