2023-2024 Coastal sage scrub and chaparral community monitoring for western San Diego County

Western San Diego County is dominated by shrublands supporting biologically diverse native plant and animal communities. Widespread urbanization has led to regional habitat loss and fragmentation and many species in these shrubland communities are rare, threatened, or endangered. Large-scale, multiple species conservation planning has resulted in a regional preserve system that focuses on these shrubland communities. A number of large-scale threats are leading to type conversion from shrub-dominated to non-native invasive annual grass-dominated vegetation. To understand the changes that are occurring to native shrublands, we have developed a vegetation monitoring program with several components at multiple spatial scales, focused on quantifying coastal sage scrub (CSS) and chaparral vegetation community characteristics. Several drivers of change associated with type conversion of native shrubland to non-native annual grassland have been identified by previous research including increasing fire frequency, nitrogen deposition from air pollution, and prolonged and intense drought associated with changing climate. The objectives of this CSS and chaparral vegetation community monitoring plan are to: 1) Determine the distribution, composition, structure, and integrity of CSS and chaparral vegetation communities on conserved lands in western San Diego County, 2) Identify whether these attributes of the vegetation communities are changing over time, and 3) Evaluate relationships of known drivers of change (threats) and environmental factors in association with changes in vegetation community attributes. The goal of this monitoring program is to classify CSS and chaparral vegetation community integrity, identify areas of degradation across western San Diego County, and characterize drivers, and environmental factors associated with loss of ecological integrity. A combination of vegetation mapping, landscape-scale remote sensing, and field plots will be used to address all the aspects of our research questions. Data compiled and collected will be available to conservation partners to help inform future management decisions.

Monitoring-Plants and Animals
Vegetation Community
in progress
Project Groups

  • SDMMP31 Vegetation Monitoring Methods

Project Focus

chaparral, coastal sage scrub

SANDAG

San Diego Management and Monitoring Program

AECOM; U.S. Geological Survey, Western Ecological Research Center

Emily Perkins

Project Protocol
Coastal Sage Scrub and Chaparral Community Monitoring Plan for Western San Diego County
UAS; transects; wandering surveys
6.41MB CSS and Chaparral Monitoring Plan Sept 2024.pdf

chaparral

Goal: Maintain, enhance and restore chaparral on Conserved Lands in the MSPA that supports or has the potential to support VF species (i.e., Del Mar manzanita, felt-leaved monardella, Lakeside ceanothus, Nuttall's scrub oak, Otay manzanita, Rainbow manzanita, wart-stemmed ceanothus, California newt, Bell's sage sparrow) and to incidentally benefit a diverse array of other species (e.g., Encinitas baccharis, Jennifer's monardella, Orcutt's hazardia, mountain lion) so that the vegetation community has high ecological integrity, and these species are resilient to environmental stochasticity, catastrophic disturbances and threats, such as very large wildfires and prolonged droughts, and will be likely to persist over the long term (>100 years).

Regional NFO 2018, 2019, 2020, 2021
MON-IMP-MONPL CHAPAR-3

Management units: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11

In 2018, conduct pilot monitoring to collect data and develop any recommendations for finalizing the vegetation monitoring plan. In 2019 to 2021, implement the final Chaparral, Coastal Sage Scrub and Grassland Vegetation Monitoring Plan.

Action Statement Action status Projects
IMP-1 Submit project metadata, monitoring datasets and reports to the MSP web portal waiting for precedent action 2023-2024 Coastal sage scrub and chaparral community monitoring for western San Diego County
Criteria Deadline year
Chaparral, Coastal Sage Scrub and Grassland Vegetation Monitoring Plan implemented 2018-2021 2021
Threat Name Threat Code
Altered fire regimeALTFIR
Climate changeCLICHN
Invasive plantsINVPLA
Loss of ecological integrityECOINT
Code Obj. code Statement
CHAPAR-1 MON-PRP-MONPL In 2017, prepare a long-term monitoring plan for the mosaic of chaparral, coastal sage scrub and grassland vegetation communities that focuses on tracking community composition, structure and ecological integrity over time in relation to climate (i.e., drought) and disturbance from fire. The monitoring plan should include a conceptual model, specific monitoring questions, the sampling frame within the MSPA, monitoring methods, a statistically valid sampling design, permanent sampling locations, timeline, and standardized protocols. Use the landscape-scale ecological integrity classification map to develop a sampling frame and the sampling design with permanent sampling plots spanning north to south and east to west environmental gradients across the MSPA. Evaluate how the vegetation integrity classes characterize other aspects of the ecosystem by integrating other types of monitoring into the long-term sampling plots, such as abiotic element monitoring (e.g., automated weather stations and soil sensors, GIS-data layers), ecological integrity monitoring (e.g., plant and animal communities, ecological processes), MSP VF species monitoring, and threats monitoring (e.g., fire, climate change, invasive plants). A draft monitoring plan should be prepared in 2017, tested in the field with a pilot study in 2018, and finalized by 2019.
CHAPAR-2 MON-DEV-MAP In 2017, develop a landscape-scale map classifying ecological integrity of shrublands across the MSPA based upon shrub cover and density and invasive nonnative annual grasses using remote imagery (e.g., satellite and high resolution aerial imagery, LIDAR) and vegetation data collected during 2015-2016 California gnatcatcher regional and postfire monitoring. Verify and revise the mapping as needed using field data collected in 2018-2020 as part of the Chaparral, Coastal Sage Scrub and Grassland Vegetation Monitoring Program and from related VF species monitoring (e.g., California gnatcatcher regional and postfire monitoring). Revise the integrity classification map as needed to respond to changes in vegetation based upon wildfires, drought or other large-scale disturbances.

chaparral

Goal: Maintain, enhance and restore chaparral on Conserved Lands in the MSPA that supports or has the potential to support VF species (i.e., Del Mar manzanita, felt-leaved monardella, Lakeside ceanothus, Nuttall's scrub oak, Otay manzanita, Rainbow manzanita, wart-stemmed ceanothus, California newt, Bell's sage sparrow) and to incidentally benefit a diverse array of other species (e.g., Encinitas baccharis, Jennifer's monardella, Orcutt's hazardia, mountain lion) so that the vegetation community has high ecological integrity, and these species are resilient to environmental stochasticity, catastrophic disturbances and threats, such as very large wildfires and prolonged droughts, and will be likely to persist over the long term (>100 years).

Regional NFO 2017, 2018, 2019, 2020, 2021
MON-DEV-MAP CHAPAR-2

Management units: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11

In 2017, develop a landscape-scale map classifying ecological integrity of shrublands across the MSPA based upon shrub cover and density and invasive nonnative annual grasses using remote imagery (e.g., satellite and high resolution aerial imagery, LIDAR) and vegetation data collected during 2015-2016 California gnatcatcher regional and postfire monitoring. Verify and revise the mapping as needed using field data collected in 2018-2020 as part of the Chaparral, Coastal Sage Scrub and Grassland Vegetation Monitoring Program and from related VF species monitoring (e.g., California gnatcatcher regional and postfire monitoring). Revise the integrity classification map as needed to respond to changes in vegetation based upon wildfires, drought or other large-scale disturbances.

Action Statement Action status Projects
DEV-1 Submit project metadata, datasets, analyses, and Ecological Integrity Classification Map to the MSP web portal In progress 2017-2019 Developing a Map of Ecological Integrity Using Remote Sensing, 2023-2024 Coastal sage scrub and chaparral community monitoring for western San Diego County
Criteria Deadline year
Ecological Integrity Map created in 2017 and updated as needed 2018-2021 2021
Threat Name Threat Code
Altered fire regimeALTFIR
Climate changeCLICHN
Invasive plantsINVPLA
Loss of ecological integrityECOINT
Code Obj. code Statement
CHAPAR-1 MON-PRP-MONPL In 2017, prepare a long-term monitoring plan for the mosaic of chaparral, coastal sage scrub and grassland vegetation communities that focuses on tracking community composition, structure and ecological integrity over time in relation to climate (i.e., drought) and disturbance from fire. The monitoring plan should include a conceptual model, specific monitoring questions, the sampling frame within the MSPA, monitoring methods, a statistically valid sampling design, permanent sampling locations, timeline, and standardized protocols. Use the landscape-scale ecological integrity classification map to develop a sampling frame and the sampling design with permanent sampling plots spanning north to south and east to west environmental gradients across the MSPA. Evaluate how the vegetation integrity classes characterize other aspects of the ecosystem by integrating other types of monitoring into the long-term sampling plots, such as abiotic element monitoring (e.g., automated weather stations and soil sensors, GIS-data layers), ecological integrity monitoring (e.g., plant and animal communities, ecological processes), MSP VF species monitoring, and threats monitoring (e.g., fire, climate change, invasive plants). A draft monitoring plan should be prepared in 2017, tested in the field with a pilot study in 2018, and finalized by 2019.
CHAPAR-3 MON-IMP-MONPL In 2018, conduct pilot monitoring to collect data and develop any recommendations for finalizing the vegetation monitoring plan. In 2019 to 2021, implement the final Chaparral, Coastal Sage Scrub and Grassland Vegetation Monitoring Plan.
POLPOL-1 MON-IMP-MONPL In 2020, implement regional and subregional California gnatcatcher monitoring initiated in 2016 to determine the percent area occupied (PAO) by California gnatcatcher in modeled high and very high suitability habitat on Conserved Lands and military lands in the MSPA as part of a larger monitoring program for southern California. Over the next 15 years, determine trends in California gnatcatcher PAO and in their colonization and extinction rates and be able to detect at least 30% change in PAO. Identify associations between habitat and threat correlates with gnatcatcher PAO and with extinction and colonization rates and develop biologically meaningful thresholds for management and to specify management criteria and recommendations.
POLPOL-2 MON-RES-SPEC In 2020, implement California gnatcatcher postfire monitoring conducted in 2015 and 2015 to: determine whether there has been further recovery of California gnatcatchers in areas burned in 2003, 2007 and 2014 (i.e., PAO>10%); evaluate if there is a difference in PAO between areas burned in 2003, 2007 and 2014; investigate the relationship between gnatcatcher PAO and vegetation composition, cover and structure; and evaluate the composition, cover and structure of coastal sage scrub in areas with different fire frequencies and patterns of vegetation recovery based upon time since fire, spatial distribution, previous land use, and environmental conditions. Use the regional gnatcatcher and vegetation monitoring protocols to monitor postfire recovery of gnatcatchers and vegetation at sampling points surveyed in 2016. Analyze gnatcatcher and vegetation data to develop overall and site specific vegetation management recommendations for postfire recovery of coastal sage scrub vegetation to support California gnatcatchers.

coastal sage scrub

Goal: Maintain, enhance and restore coastal sage scrub on Conserved Lands in the MSPA that supports or has the potential to support VF species (i.e., cliff spurge, Palmer's goldenbush, San Diego barrel cactus, snake cholla, Blaineville's horned lizard, California gnatcatcher, San Diego black-tailed jackrabbit) and to incidentally benefit a diverse array of other species (e.g., San Diego thornmint, Hermes copper, Quino checkerspot, coastal cactus wren) so that the vegetation community has high ecological integrity, and these species are resilient to environmental stochasticity, catastrophic disturbances and threats, such as very large wildfires, invasive plants and prolonged drought, and will be likely to persist over the long term (>100 years).

Regional NFO 2017, 2018, 2019, 2020, 2021
MON-DEV-MAP COSASC-2

Management units: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11

In 2017, develop a landscape-scale map classifying ecological integrity of shrublands across the MSPA based upon shrub cover and density and invasive nonnative annual grasses using remote imagery (e.g., satellite and high resolution aerial imagery, LIDAR) and vegetation data collected during 2015-2016 California gnatcatcher regional and postfire monitoring. Verify and revise the mapping as needed using field data collected in 2018-2020 as part of the Chaparral, Coastal Sage Scrub and Grassland Monitoring Program and from related VF species monitoring (e.g., California gnatcatcher regional and postfire monitoring). Revise the integrity classification map as needed to respond to changes in vegetation based upon wildfires, drought or other large-scale disturbances.

Action Statement Action status Projects
DEV-1 Submit project metadata, datasets, analyses, and Ecological Integrity Classification Map to the MSP web portal In progress 2017-2019 Developing a Map of Ecological Integrity Using Remote Sensing, 2023-2024 Coastal sage scrub and chaparral community monitoring for western San Diego County
Criteria Deadline year
Ecological Integrity Map created in 2017 and updated as needed 2018-2021 2021
Threat Name Threat Code
Altered fire regimeALTFIR
Climate changeCLICHN
Invasive plantsINVPLA
Loss of ecological integrityECOINT
Code Obj. code Statement
COSASC-1 MON-PRP-MONPL In 2017, prepare a long-term monitoring plan for the mosaic of chaparral, coastal sage scrub and grassland vegetation communities that focuses on tracking community composition, structure and ecological integrity over time in relation to climate (i.e., drought) and disturbance from fire. The monitoring plan should include a conceptual model, specific monitoring questions, the sampling frame within the MSPA, monitoring methods, a statistically valid sampling design, permanent sampling locations, timeline, and standardized protocols. Use the landscape-scale ecological integrity classification map to develop a sampling frame and the sampling design with permanent sampling plots spanning north to south and east to west environmental gradients across the MSPA. Evaluate how the vegetation integrity classes characterize other aspects of the ecosystem by integrating other types of monitoring into the long-term sampling plots, such as abiotic element monitoring (e.g., automated weather stations and soil sensors, GIS-data layers), ecological integrity monitoring (e.g., plant and animal communities, ecological processes), MSP VF species monitoring, and threats monitoring (e.g., fire, climate change, invasive plants). A draft monitoring plan should be prepared in 2017, tested in the field with a pilot study in 2018, and finalized by 2019.
COSASC-3 MON-IMP-MONPL In 2018, conduct pilot monitoring to collect data and develop any recommendations for finalizing the monitoring plan. From 2019 to 2021, implement the final Chaparral, Coastal Sage Scrub and Grassland Vegetation Monitoring Plan.
POLPOL-1 MON-IMP-MONPL In 2020, implement regional and subregional California gnatcatcher monitoring initiated in 2016 to determine the percent area occupied (PAO) by California gnatcatcher in modeled high and very high suitability habitat on Conserved Lands and military lands in the MSPA as part of a larger monitoring program for southern California. Over the next 15 years, determine trends in California gnatcatcher PAO and in their colonization and extinction rates and be able to detect at least 30% change in PAO. Identify associations between habitat and threat correlates with gnatcatcher PAO and with extinction and colonization rates and develop biologically meaningful thresholds for management and to specify management criteria and recommendations.
POLPOL-2 MON-RES-SPEC In 2020, implement California gnatcatcher postfire monitoring conducted in 2015 and 2015 to: determine whether there has been further recovery of California gnatcatchers in areas burned in 2003, 2007 and 2014 (i.e., PAO>10%); evaluate if there is a difference in PAO between areas burned in 2003, 2007 and 2014; investigate the relationship between gnatcatcher PAO and vegetation composition, cover and structure; and evaluate the composition, cover and structure of coastal sage scrub in areas with different fire frequencies and patterns of vegetation recovery based upon time since fire, spatial distribution, previous land use, and environmental conditions. Use the regional gnatcatcher and vegetation monitoring protocols to monitor postfire recovery of gnatcatchers and vegetation at sampling points surveyed in 2016. Analyze gnatcatcher and vegetation data to develop overall and site specific vegetation management recommendations for postfire recovery of coastal sage scrub vegetation to support California gnatcatchers.

coastal sage scrub

Goal: Maintain, enhance and restore coastal sage scrub on Conserved Lands in the MSPA that supports or has the potential to support VF species (i.e., cliff spurge, Palmer's goldenbush, San Diego barrel cactus, snake cholla, Blaineville's horned lizard, California gnatcatcher, San Diego black-tailed jackrabbit) and to incidentally benefit a diverse array of other species (e.g., San Diego thornmint, Hermes copper, Quino checkerspot, coastal cactus wren) so that the vegetation community has high ecological integrity, and these species are resilient to environmental stochasticity, catastrophic disturbances and threats, such as very large wildfires, invasive plants and prolonged drought, and will be likely to persist over the long term (>100 years).

Regional NFO 2018, 2019, 2020, 2021
MON-IMP-MONPL COSASC-3

Management units: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11

In 2018, conduct pilot monitoring to collect data and develop any recommendations for finalizing the monitoring plan. From 2019 to 2021, implement the final Chaparral, Coastal Sage Scrub and Grassland Vegetation Monitoring Plan.

Action Statement Action status Projects
IMP-1 Submit project metadata, monitoring datasets and reports to the MSP web portal waiting for precedent action 2023-2024 Coastal sage scrub and chaparral community monitoring for western San Diego County
Criteria Deadline year
Chaparral, Coastal Sage Scrub and Grassland Vegetation Monitoring Plan implemented 2018-2021 2021
Threat Name Threat Code
Altered fire regimeALTFIR
Climate changeCLICHN
Invasive plantsINVPLA
Loss of ecological integrityECOINT
Code Obj. code Statement
COSASC-1 MON-PRP-MONPL In 2017, prepare a long-term monitoring plan for the mosaic of chaparral, coastal sage scrub and grassland vegetation communities that focuses on tracking community composition, structure and ecological integrity over time in relation to climate (i.e., drought) and disturbance from fire. The monitoring plan should include a conceptual model, specific monitoring questions, the sampling frame within the MSPA, monitoring methods, a statistically valid sampling design, permanent sampling locations, timeline, and standardized protocols. Use the landscape-scale ecological integrity classification map to develop a sampling frame and the sampling design with permanent sampling plots spanning north to south and east to west environmental gradients across the MSPA. Evaluate how the vegetation integrity classes characterize other aspects of the ecosystem by integrating other types of monitoring into the long-term sampling plots, such as abiotic element monitoring (e.g., automated weather stations and soil sensors, GIS-data layers), ecological integrity monitoring (e.g., plant and animal communities, ecological processes), MSP VF species monitoring, and threats monitoring (e.g., fire, climate change, invasive plants). A draft monitoring plan should be prepared in 2017, tested in the field with a pilot study in 2018, and finalized by 2019.
COSASC-2 MON-DEV-MAP In 2017, develop a landscape-scale map classifying ecological integrity of shrublands across the MSPA based upon shrub cover and density and invasive nonnative annual grasses using remote imagery (e.g., satellite and high resolution aerial imagery, LIDAR) and vegetation data collected during 2015-2016 California gnatcatcher regional and postfire monitoring. Verify and revise the mapping as needed using field data collected in 2018-2020 as part of the Chaparral, Coastal Sage Scrub and Grassland Monitoring Program and from related VF species monitoring (e.g., California gnatcatcher regional and postfire monitoring). Revise the integrity classification map as needed to respond to changes in vegetation based upon wildfires, drought or other large-scale disturbances.
File name Lead Author Year Type
CSS and chaparral community monitoring plan R code Gould, Philip protocol supplement