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San Diego thorn-mint Acanthomintha ilicifolia

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.

regional and/or local PRE 2017, 2018, 2019, 2020, 2021 SO
MGT-IMP-FMGT ACAILI-1

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
Code Obj. code Statement
ACAILI-2 MON-IMP-IMG 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.
regional and/or local NFO 2017, 2018, 2019, 2020, 2021 SO
MON-IMP-IMG ACAILI-2

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 regimeALTFIR
Human uses of the PreservesHUMUSE
Invasive plantsINVPLA
Urban developmentURBDEV
Code Obj. code Statement
ACAILI-3 MGT-IMP-IMG 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.
ACAILI-4 MGT-DEV-BMP In 2017, continue refining BMPs developed for San Diego thornmint (CBI 2014) by incorporating results of management experiments to control invasive species that threaten populations (e.g., Brachypodium removal studies at Mission Trails and South Crest) and based on research studies (e.g., seed bulking guidelines, seed transfer zones).
ACAILI-5 MON-RES-GEN In 2017, continue a study begun in 2016 to characterize the population genetic structure, gene flow, and genetic diversity for San Diego thornmint occurrences (see occurrence table). The study will determine if there is evidence of mixed ploidy levels within or among occurrences; evaluate vulnerability of occurrences to genetic drift and loss of genetic diversity; assess the level of gene flow among occurrences; identify if there are signatures of genetic bottlenecks or low genetic diversity in occurrences that have undergone recent reductions; and look for evidence of local population adaptation. Based on the results of the genetic analyses, management recommendations will include whether common garden and reciprocal transplantations are necessary before proceeding with population enhancement or restoration and will provide specific recommendations for collecting, bulking and distributing seed to enhance existing occurrences or establish new occurrences.
ACAILI-6 MGT-PRP-MGTPL 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
local NFO 2017, 2018, 2019, 2020, 2021 SO
MGT-IMP-IMG ACAILI-3

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 regimeALTFIR
Human uses of the PreservesHUMUSE
Invasive plantsINVPLA
Urban developmentURBDEV
Code Obj. code Statement
ACAILI-2 MON-IMP-IMG 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.
ACAILI-4 MGT-DEV-BMP In 2017, continue refining BMPs developed for San Diego thornmint (CBI 2014) by incorporating results of management experiments to control invasive species that threaten populations (e.g., Brachypodium removal studies at Mission Trails and South Crest) and based on research studies (e.g., seed bulking guidelines, seed transfer zones).
ACAILI-6 MGT-PRP-MGTPL 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
ACAILI-9 MGT-PRP-SBPL 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.
Regional and/or Local NFO 2019, 2020, 2021 SO
MGT-IMP-MGTPL ACAILI-7

Management units: 3, 4, 5, 6

In 2019, begin implementing highest priority management actions identified for San Diego thornmint in the MSP Rare Plant Management Plan.

Action Statement Action status Projects
IMP-1 Submit project metadata, management datasets, and report to the MSP Web Portal. waiting for precedent action
Criteria Deadline year
By 2023, =2 High Priority Management Actions Implemented for San Diego Thornmint from the MSP Rare Plant Management Plan 2021
Code Obj. code Statement
ACAILI-6 MGT-PRP-MGTPL 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
ACAILI-8 MON-IMP-MGTPL In 2019, begin monitoring the effectiveness of implementation of the highest priority management actions identified in the San Diego thornmint section of the MSP Rare Plant Management Plan.
ACAILI-9 MGT-PRP-SBPL 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.
Regional and/or Local NFO 2019, 2020, 2021 SO
MON-IMP-MGTPL ACAILI-8

Management units: 3, 4, 5, 6

In 2019, begin monitoring the effectiveness of implementation of the highest priority management actions identified in the San Diego thornmint section of the MSP Rare Plant Management Plan.

Action Statement Action status Projects
IMP-1 Submit metadata, management effectiveness datasets, analyses, and report to the MSP Web Portal. waiting for precedent action
Criteria Deadline year
Effectiveness of High Priority Management Actions Determined 2021
Code Obj. code Statement
ACAILI-6 MGT-PRP-MGTPL 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
ACAILI-7 MGT-IMP-MGTPL In 2019, begin implementing highest priority management actions identified for San Diego thornmint in the MSP Rare Plant Management Plan.
Regional and/or Local NFO 2019, 2020, 2021 SO
MGT-IMP-SBPL ACAILI-10

Management units: 3, 4, 5, 6

In 2019, begin implementing the MSP Seed Collection, Banking and Bulking Plan for San Diego thornmint to collect and store seeds at a permanent seed bank and to provide propagules as needed for management oriented research, existing population enhancement and establishment of new occurrences.

Action Statement Action status Projects
IMP-1 Bulk seed at a qualified facility for enhancement, expansion, establishment or transplantation projects using seed from genetically appropriate donor accessions in the propagation seed bank collection. waiting for precedent action California Plant Rescue (CaPR) - San Diego Zoo Wildlife Alliance's Native Plant Seed Bank
IMP-2 Maintain records for collected seed to document donor and receptor sites, collection dates and amounts. Submit seed collection, storage and bulking data to the 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 2023, =2 Highest Priority Actions Implemented for San Diego thornmint from the MSP Seed Banking and Bulking Plan 2021
Code Obj. code Statement
ACAILI-5 MON-RES-GEN In 2017, continue a study begun in 2016 to characterize the population genetic structure, gene flow, and genetic diversity for San Diego thornmint occurrences (see occurrence table). The study will determine if there is evidence of mixed ploidy levels within or among occurrences; evaluate vulnerability of occurrences to genetic drift and loss of genetic diversity; assess the level of gene flow among occurrences; identify if there are signatures of genetic bottlenecks or low genetic diversity in occurrences that have undergone recent reductions; and look for evidence of local population adaptation. Based on the results of the genetic analyses, management recommendations will include whether common garden and reciprocal transplantations are necessary before proceeding with population enhancement or restoration and will provide specific recommendations for collecting, bulking and distributing seed to enhance existing occurrences or establish new occurrences.
ACAILI-9 MGT-PRP-SBPL 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.