Goal: Maintain large populations, enhance small populations, and establish new populations of San Diego thornmint or pollinator habitat to buffer against environmental stochasticity, maintain genetic diversity, and promote connectivity, thereby enhancing resilience within and among MUs over the long-term (>100 years) in native habitats.
Management units: 3, 4, 5, 6
Starting in 2017, reduce the potential impact of fire for at risk large populations of San Diego thornmint (see occurrence table) by reducing fuel loads of invasive annuals
| Action | Statement | Action status | Projects |
|---|---|---|---|
| IMP-1 | Manage thatch and invasive annuals every 3-5 years to reduce fire threat for populations of San Diego thornmint most at risk of fire (populations with ignition probability or fire frequency > 3 or that have burned since 2003) | available for implementation | |
| IMP-2 | Submit project metadata, monitoring datasets and report with management actions to the MSP Web Portal. | waiting for precedent action |
| Criteria | Deadline year |
|---|---|
| Fuel Loads and Invasive Grasses Reduced for at Risk Populations | 2021 |
| Threat Name | Threat Code |
|---|---|
| Altered fire regime | ALTFIR |
| Human uses of the Preserves | HUMUSE |
| Invasive plants | INVPLA |
| Loss of connectivity | LOSCON |
| Urban development | URBDEV |
Management units: 3, 4, 5, 6
Beginning in 2017, annually inspect conserved populations of San Diego thornmint (see occurrence table) using the regional rare plant IMG monitoring protocol to record abundance and collect covariate habitat and threats data to determine management needs.
| Action | Statement | Action status | Projects |
|---|---|---|---|
| IMP-1 | Based upon occurrence status and threats, determine management needs including whether routine management or more intensive management is warranted. | some occurrences are in progress | |
| IMP-2 | Submit project metadata, occurrence status, habitat and threats data, and management recommendations to the MSP Web Portal. | some occurrences are in progress |
| Criteria | Deadline year |
|---|---|
| Surveys Completed Annually with Management Recommendations | 2021 |
| Threat Name | Threat Code |
|---|---|
| Altered fire regime | ALTFIR |
| Human uses of the Preserves | HUMUSE |
| Invasive plants | INVPLA |
| Urban development | URBDEV |
Management units: 3, 4, 5, 6
Beginning in 2017, conduct routine management actions identified through the IMG monitoring at San Diego thornmint occurrences on Conserved Lands (see occurrence table). Depending on the type and level of threat, management should only be conducted as needed, not necessarily every year, and using BMPs with precautions to do no harm.
| Action | Statement | Action status | Projects |
|---|---|---|---|
| IMP-1 | Perform routine management activities as needed, such as protecting occurrences from disturbance through enforcement and controlling invasive non-native plant species to =20% absolute cover. | available for implementation | San Diego Thornmint Restoration |
| IMP-2 | Submit project metadata and management data to MSP web portal. | available for implementation | San Diego Thornmint Restoration |
| Criteria | Deadline year |
|---|---|
| Routine Management Completed as Needed Based Upon Monitoring Recommendations | 2021 |
| Threat Name | Threat Code |
|---|---|
| Altered fire regime | ALTFIR |
| Human uses of the Preserves | HUMUSE |
| Invasive plants | INVPLA |
| Urban development | URBDEV |
Management units: 3, 4, 5, 6
In 2018, begin preparing a section for San Diego thornmint the MSP Rare Plant Management Plan that prioritizes management actions to maintain or expand occurrences on Conserved Lands based upon an assessment of data on occurrence status, habitat and threats. Prioritize management recommendations to maintain large occurrences and enhance at least 3 small occurrences (see occurrence table). Minimum criteria for enhancement are to reduce invasive annual nonnative plants and thatch to less than 20% absolute cover within the occurrence
| Action | Statement | Action status | Projects |
|---|---|---|---|
| PRP-1 | Consult the San Diego County Rare Plant Working Group made up of plant ecologists, geneticists, rare plant experts, land managers, restoration practitioners, seed banking and bulking practitioners, wildlife agencies, and other stakeholders to provide input and recommendations for the San Diego thornmint section in the MSP Rare Plant Management Plan. | waiting for precedent action | |
| PRP-2 | Develop a conceptual model that identifies management actions to effectively reduce threats to San Diego thornmint occurrences. | waiting for precedent action | |
| PRP-3 | Prioritize occurrences for management based upon an assessment of occurrence size, the potential for management to significantly reduce identified threats, and the availability of adjacent suitable habitat for occurrence expansion. | waiting for precedent action | |
| PRP-4 | Develop an implementation plan for San Diego thornmint that prioritizes management actions for the next 5 years and details tasks, lead entities, responsibilities, and timelines, budgets. | waiting for precedent action | |
| PRP-5 | Submit project metadata and MSP Rare Plant Management Plan to the MSP Web Portal. | waiting for precedent action |
| Criteria | Deadline year |
|---|---|
| By 2019 Completed Section for San Diego Thornmint in the MSP Rare Plant Management Plan. | 2021 |
| Threat Name | Threat Code |
|---|---|
| Altered fire regime | ALTFIR |
| Climate change | CLICHN |
| Human uses of the Preserves | HUMUSE |
| Invasive plants | INVPLA |
| Loss of connectivity | LOSCON |
| Urban development | URBDEV |
Management units: 3, 4, 5, 6
In 2018, begin preparing a section for San Diego thornmint in the MSP Seed Collection, Banking and Bulking Plan to preserve genetic diversity and rescue occurrences in case of catastrophic disturbance. The plan should incorporate best science and management practices (Wall 2009, KEW 2016) and recommendations from the 2016-2017 genetic study to provide guidelines for collecting and storing seeds over the long term at a permanent, established conservation seed bank (e.g., Institute for Conservation Research Native Plant Seed Bank, Rancho Santa Ana Botanic Garden Seed Conservation Program) and for providing sources of seeds for management purposes. The plan should include recommendations for: collecting and storing seeds for conservation banking; management oriented research; rescuing occurrences after catastrophic disturbances; and seed bulking and out-planting to augment extant occurrences or to establish new occurrences with consideration of genetic implications for population sustainability.
| Action | Statement | Action status | Projects |
|---|---|---|---|
| PRP-1 | Consult the San Diego County Rare Plant Working Group made up of plant ecologists, geneticists, rare plant experts, land managers, restoration practitioners, seed banking and bulking practitioners, wildlife agencies, and other stakeholders to provide input and recommendations for the San Diego thornmint section of the MSP Seed Collection, Banking and Bulking Plan. | waiting for precedent action | California Plant Rescue (CaPR) - San Diego Zoo Wildlife Alliance's Native Plant Seed Bank |
| PRP-2 | Prepare a seed collection plan to collect seeds over multiple years, collect seeds several times within a season, accumulate seeds across populations, and to sample among habitats and ecological niches. Include guidelines for collecting and storing seeds along maternal lines from small occurrences (<1,000 plants) and to provide propagules to be used in management experiments, enhancement of existing occurrences, and establishment of new occurrences. | waiting for precedent action | California Plant Rescue (CaPR) - San Diego Zoo Wildlife Alliance's Native Plant Seed Bank |
| PRP-3 | The seed collection plan should include guidelines for collecting seeds from occurrences of sufficient size to accommodate harvest and based on genetic studies as available. Include provisions for collecting seed from unconserved populations planned for development. | waiting for precedent action | California Plant Rescue (CaPR) - San Diego Zoo Wildlife Alliance's Native Plant Seed Bank |
| PRP-4 | Include protocols and guidelines for collecting voucher specimens and submitting to the San Diego Natural History Museum (McEachern et al. 2007). | waiting for precedent action | California Plant Rescue (CaPR) - San Diego Zoo Wildlife Alliance's Native Plant Seed Bank |
| PRP-5 | Include guidelines for testing seeds for viability and to obtain information on dormancy and germination rates. | waiting for precedent action | California Plant Rescue (CaPR) - San Diego Zoo Wildlife Alliance's Native Plant Seed Bank |
| PRP-6 | Submit project metadata and MSP Seed Collection, Banking and Bulking Plan to MSP Web Portal. | waiting for precedent action | California Plant Rescue (CaPR) - San Diego Zoo Wildlife Alliance's Native Plant Seed Bank |
| Criteria | Deadline year |
|---|---|
| By 2019, Completed Section for San Diego thornmint in the MSP Seed Collection Banking and Bulking Plan | 2021 |
| Threat Name | Threat Code |
|---|---|
| Altered fire regime | ALTFIR |
| Climate change | CLICHN |
| Human uses of the Preserves | HUMUSE |
| Invasive plants | INVPLA |
| Loss of connectivity | LOSCON |
| Urban development | URBDEV |