San Diego Management & Monitoring Program


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Coastal cactus wren Campylorhynchus brunneicapillus sandiegensis

Goal: Protect, enhance, and restore suitable cactus scrub habitat for coastal cactus wrens to increase effective population size in each genetic cluster at a short term sustainable level (e.g. 50-100 wrens), rehabilitate habitat destroyed by wildfire, improve habitat quality to maintain populations during drought, enhance connectivity within and between genetic clusters to increase genetic diversity and rescue small populations, and manage anthropogenic predation risk to ensure the long term persistence (>100 years) of cactus wrens on Conserved Lands in the MSPA.

regional and/or local POST 2017, 2018, 2019, 2020, 2021 SO

MGT-IMP-MGTPL CAMBRU-1

Management units: 2, 3, 4

From 2017 through 2021, continue implementing high priority management actions to: expand coastal cactus wren populations; rehabilitate habitat destroyed in the 2003 Cedar and 2007 Harris wildfires; improve connectivity within and between the Otay and San Diego/El Cajon genetic clusters (see occurrence table); and manage high risk of anthropogenic predation of adults and nestlings. These priority management actions are identified in the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan prepared in 2015.
Action Statement Action status Projects
IMP-1 Following best practices in the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan, design cactus scrub enhancement and restoration projects to provide high quality nesting and foraging habitat with large patches of cacti >1 m tall in a mosaic of open scrub that provides sufficient food resources for reproduction and survival, especially during drought. As they become available, incoporate the results from the Cactus Wren Demography, Foraging and Arthropod Study to create restoration palettes that favor plant species associated with important arthropod food resources. Design planting layouts to maximize water availability by allocating a portion of the plantings to more mesic sites, such as ravines, at the bottom of slopes, and on northerly and easterly aspects. Control invasive nonnative plants to =20% absolute cover to reduce competition with native plants for water and light. some occurrences are in progress Otay River Valley Cactus Wren Habitat Restoration and Enhancement , Salt Creek Coastal Cactus Wren Habitat Restoration Project
IMP-2 Implement management actions, as needed, to reduce anthropogenic predation on wrens and their nests in fragmented habitats bordered by development where wrens are vulnerable to predation by cats, Cooper's hawks, corvids and other human-subsidized predators. Actions could include removing selected trees within or bordering cactus scrub that provide hunting, roosting, and nesting perches for hawks and corvids and avoiding cactus scrub restoration in areas where the terrain and location make wrens especially vulnerable to predation. Other measures could involve humanely removing feral cats from Conserved Lands and providing educational material and signage encouraging neighboring homeowners to keep their cats indoors so that wrens are protected and cats are safe from predation by wild animals, such as coyotes. some occurrences are in progress Otay River Valley Cactus Wren Habitat Restoration and Enhancement , Salt Creek Coastal Cactus Wren Habitat Restoration Project
Criteria Deadline year
By 2021, =3 High Priority Management Actions Implemented from the 2015 South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan 2021
Code Obj. code Statement
CAMBRU-2 MON-IMP-MGTPL From 2017-2021, collect data on the effectiveness of implementing high priority management actions from the 2015 South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan. In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for the combined Otay and San Diego/El Cajon genetic clusters (see occurrence table) in south San Diego County. These results will be used in 2022 to update management recommendations and success criteria for the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan.
CAMBRU-3 MON-SURV-SPEC From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
CAMBRU-5 MON-RES-GEN From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
CAMBRU-6 MGT-IMP-NUR From 2017-2021, continue operation of the North San Diego County Cactus Nursery and support a South San Diego County Cactus Nursery to supply cactus to land managers to enhance, restore and create coastal cactus wren habitat. Grow cactus pads, segments and entire plants sufficient for restoration projects to expand and enhance cactus scrub habitat and as a source of plants for immediate habitat rehabilitation following severe wildfire.
CAMBRU-9 MGT-IMP-FMGT Implement prefire management to reduce potential severity and impacts from future fire at prioritized cactus wren occurrences and habitats most at risk from wildfire.
regional and/or local NFO 2017, 2018, 2019, 2020, 2021 SO

MON-IMP-MGTPL CAMBRU-2

Management units: 2, 3, 4

From 2017-2021, collect data on the effectiveness of implementing high priority management actions from the 2015 South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan. In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for the combined Otay and San Diego/El Cajon genetic clusters (see occurrence table) in south San Diego County. These results will be used in 2022 to update management recommendations and success criteria for the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan.
Action Statement Action status Projects
IMP-1 Collect vegetation data to document success of cactus scrub restoration projects. This can include monitoring the height, diameter and survival of planted cactus and the composition and percent cover of native and nonnative shrubs, forbs and grasses. Document wren use of restored cactus scrub. some occurrences are in progress
IMP-2 Submit restoration and enhancement project metadata, management datasets, and reports to the MSP Web Portal. in progress
IMP-3 Conduct a meta-analysis of habitat restoration data and cactus wren population survey data to determine whether short-term success criteria have been achieved for habitat restoration actions and for wren populations in south San Diego County. Based upon these results, prepare recommendations for the 2022-2031 management strategy for coastal cactus wren. These broad recommendations can be used in 2022 to update the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan with the next set of success criteria and specific, prioritized management actions. waiting for precedent action
IMP-4 Submit cactus wren habitat restoration and population meta-analysis datasets, results, and management strategy recommendations for south San Diego County to the MSP Web Portal. waiting for precedent action
Criteria Deadline year
Success Criteria 2013-2021: Restore =70 Acres of High Quality Cactus Scrub and Increase the Combined Otay and San Diego/El Cajon Genetic Clusters to =75 Territories on C 2021
Code Obj. code Statement
CAMBRU-1 MGT-IMP-MGTPL From 2017 through 2021, continue implementing high priority management actions to: expand coastal cactus wren populations; rehabilitate habitat destroyed in the 2003 Cedar and 2007 Harris wildfires; improve connectivity within and between the Otay and San Diego/El Cajon genetic clusters (see occurrence table); and manage high risk of anthropogenic predation of adults and nestlings. These priority management actions are identified in the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan prepared in 2015.
CAMBRU-3 MON-SURV-SPEC From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
CAMBRU-5 MON-RES-GEN From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
CAMBRU-6 MGT-IMP-NUR From 2017-2021, continue operation of the North San Diego County Cactus Nursery and support a South San Diego County Cactus Nursery to supply cactus to land managers to enhance, restore and create coastal cactus wren habitat. Grow cactus pads, segments and entire plants sufficient for restoration projects to expand and enhance cactus scrub habitat and as a source of plants for immediate habitat rehabilitation following severe wildfire.
CAMBRU-9 MGT-IMP-FMGT Implement prefire management to reduce potential severity and impacts from future fire at prioritized cactus wren occurrences and habitats most at risk from wildfire.
regional and/or local NFO 2017, 2018, 2019, 2020, 2021 SO

MON-SURV-SPEC CAMBRU-3

Management units: 2, 3, 4, 6

From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
Action Statement Action status Projects
SURV-1 Conduct 2 rounds of protocol surveys each year for coastal cactus wrens in mapped cactus at long term monitoring sites and expand monitoring sites, as needed, to include restoration sites and newly conserved cactus scrub. Use standardized protocols to document the number of wrens observed, age, sex, pairing and nesting status, and color band combinations, and to assess habitat for shrub overgrowth and crowding, invasive plants, unhealthy or dead cactus, and dominant shrub and cactus species. Update cactus mapping at restored and newly conserved sites. in progress
SURV-2 In conjunction with the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, focus on collecting banding status data to better understand cactus wren population dynamics, adult and juvenile survival, and dispersal capabilities in south San Diego County. unknown
SURV-3 Submit project metadata, cactus wren survey and habitat assessment datasets, analyses and survey reports to the MSP Web Portal. in progress
Criteria Deadline year
Cactus Wren Surveys and Habitat Assessments Completed 2017-2021 2021
Code Obj. code Statement
CAMBRU-1 MGT-IMP-MGTPL From 2017 through 2021, continue implementing high priority management actions to: expand coastal cactus wren populations; rehabilitate habitat destroyed in the 2003 Cedar and 2007 Harris wildfires; improve connectivity within and between the Otay and San Diego/El Cajon genetic clusters (see occurrence table); and manage high risk of anthropogenic predation of adults and nestlings. These priority management actions are identified in the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan prepared in 2015.
CAMBRU-2 MON-IMP-MGTPL From 2017-2021, collect data on the effectiveness of implementing high priority management actions from the 2015 South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan. In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for the combined Otay and San Diego/El Cajon genetic clusters (see occurrence table) in south San Diego County. These results will be used in 2022 to update management recommendations and success criteria for the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
CAMBRU-5 MON-RES-GEN From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
CAMBRU-7 MGT-IMP-IEX In 2017-2021, continue supporting restoration of cactus scrub based upon ICR's Restoration Analyses for the San Pasqual Valley/Lake Hodges coastal cactus wren genetic cluster (see occurrence table) to: rehabilitate cactus scrub destroyed or degraded by the 2007 Witch Fire; to expand occurrences, particularly adjacent to Lake Hodges; to improve connectivity within the genetic cluster; and as needed, to manage high risk of anthropogenic predation of adults and nestlings.
CAMBRU-9 MGT-IMP-FMGT Implement prefire management to reduce potential severity and impacts from future fire at prioritized cactus wren occurrences and habitats most at risk from wildfire.
CAMBRU-10 MON-IMP-FMGT For at least the first 3 years following a wildfire, use a standardized survey protocol to determine the status of coastal cactus wren occurrences affected by the wildfire. Use a standardized postfire protocol to collect vegetation and other covariates important in characterizing postfire cactus scrub habitat recovery. Collect habitat recovery data at unoccupied cactus scrub sites that are important for enhancing connectivity or for future population expansion. Identify and prioritize management actions to recover wren populations and important cactus scrub habitat patches.
CAMBRU-11 MGT-IMP-FMGT For at least the first 3 years following a wildfire, implement management actions identified by postfire monitoring as necessary to protect and rehabilitate high quality cactus scrub to allow for recovery of coastal cactus wren occurrences affected by the wildfire.
regional and/or local NFO 2017, 2018, 2019 SO

MON-RES-SPEC CAMBRU-4

Management units: 2, 3, 4

From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
Action Statement Action status Projects
RES-1 Capture, uniquely color band, and monitor cactus wrens regularly during the breeding season to collect data on territory and breeding status, nesting phenology, nest fate, number of eggs/nestlings/fledglings per nest, and annual productivity, dispersal and survival. Measure habitat quality at each territory by characterizing the vegetation and by sampling arthropod communities associated with bare ground and 8 plant species common to cactus scrub. Determine nestling diets by collecting fecal samples during banding and using DNA barcoding methods to identify the arthropod taxa fed to nestlings. in progress
RES-2 Identify arthropods important in the diet of nestling cactus wrens based on a DNA barcoding identification of arthropods in fecal samples obtained from the south San Diego County study, from the results of a similar study in Orange County, and from a literature search of adult and nestling cactus wren diets across their range. Evaluate the occurrence of arthropod taxa important to wren diets in association with 8 specific plant species and bare ground to determine those habitat attributes in cactus scrub that provide significant food resources for cactus wrens. Analyze wren reproductive parameters in relation to expected arthropod food availability based on the habitat attributes of each territory. Use the results to develop specific management recommendations for plant restoration palettes and for restoring the composition and cover of plants and bare ground that enhance food availablity for wrens. Determine how plants might be situated in the landscape to enhance arthropod food availability during droughts, such as planting a portion of plants in more mesic sites in ravines, at the bottom of slopes and on northerly and easterly aspects. in progress
RES-3 Project metadata, datasets, analyses, and report with specific management recommendations will be submitted to the MSP Web Portal. in progress
Criteria Deadline year
Coastal Cactus Wren Demography, Vegetation and Arthropod Study and Report with Management Recommendations Completed by 2020 2021
Code Obj. code Statement
CAMBRU-1 MGT-IMP-MGTPL From 2017 through 2021, continue implementing high priority management actions to: expand coastal cactus wren populations; rehabilitate habitat destroyed in the 2003 Cedar and 2007 Harris wildfires; improve connectivity within and between the Otay and San Diego/El Cajon genetic clusters (see occurrence table); and manage high risk of anthropogenic predation of adults and nestlings. These priority management actions are identified in the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan prepared in 2015.
CAMBRU-2 MON-IMP-MGTPL From 2017-2021, collect data on the effectiveness of implementing high priority management actions from the 2015 South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan. In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for the combined Otay and San Diego/El Cajon genetic clusters (see occurrence table) in south San Diego County. These results will be used in 2022 to update management recommendations and success criteria for the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan.
CAMBRU-3 MON-SURV-SPEC From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
CAMBRU-5 MON-RES-GEN From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
CAMBRU-7 MGT-IMP-IEX In 2017-2021, continue supporting restoration of cactus scrub based upon ICR's Restoration Analyses for the San Pasqual Valley/Lake Hodges coastal cactus wren genetic cluster (see occurrence table) to: rehabilitate cactus scrub destroyed or degraded by the 2007 Witch Fire; to expand occurrences, particularly adjacent to Lake Hodges; to improve connectivity within the genetic cluster; and as needed, to manage high risk of anthropogenic predation of adults and nestlings.
CAMBRU-8 MON-IMP-MGTPL From 2017-2021, collect data on the effectiveness of implementing high priority management actions to restore cactus scrub to expand coastal cactus wren populations and enhance connectivity within the San Pasqual Valley/Lake Hodges genetic cluster (see occurrence table). In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for north San Diego County. Use these results to develop a management strategy that will provide the basis for preparing a North County Coastal Cactus Wren Habitat Conservation and Management Plan in 2022.
CAMBRU-9 MGT-IMP-FMGT Implement prefire management to reduce potential severity and impacts from future fire at prioritized cactus wren occurrences and habitats most at risk from wildfire.
CAMBRU-10 MON-IMP-FMGT For at least the first 3 years following a wildfire, use a standardized survey protocol to determine the status of coastal cactus wren occurrences affected by the wildfire. Use a standardized postfire protocol to collect vegetation and other covariates important in characterizing postfire cactus scrub habitat recovery. Collect habitat recovery data at unoccupied cactus scrub sites that are important for enhancing connectivity or for future population expansion. Identify and prioritize management actions to recover wren populations and important cactus scrub habitat patches.
CAMBRU-11 MGT-IMP-FMGT For at least the first 3 years following a wildfire, implement management actions identified by postfire monitoring as necessary to protect and rehabilitate high quality cactus scrub to allow for recovery of coastal cactus wren occurrences affected by the wildfire.
regional and/or local NFO 2017, 2018, 2019 SO

MON-RES-GEN CAMBRU-5

Management units: 2, 3, 4, 6

From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
Action Statement Action status Projects
RES-1 Collaborate with the Natural Community Coalition to repeat the 2012 Southern California Coastal Cactus Wren Genetics Study (Barr et al. 2013, 2015) for the Coastal Orange County-Camp Pendleton, San Diego/El Cajon, Otay, and San Pasqual genetic clusters. Evaluate whether the clusters with low effective population sizes and potential inbreeding have changed their levels of genetic diversity in the intervening 6 years with management to increase cactus scrub and improve connectivity, from translocating wrens between genetic clusters, or from population declines during a long and intense drought. in progress
RES-2 Analyze genetic and reproduction data from Orange County and San Diego County studies to determine if reproduction may be adversely affected by inbreeding or low genetic diversity. If lack of genetic diversity and inbreeding show signs of depressing productivity, then evaluate and prioritize specific management recommendations to increase gene flow, such as switching eggs or translocating individuals between genetic clusters over the short term and restoring habitat to expand populations and improve connectivity within and between genetic clusters over the long term. in progress
RES-3 Submit project metadata, datasets, analyses, and report with specific management recommendations to the MSP Web Portal. in progress
Criteria Deadline year
Genetic Study Completed and Report Submitted by 2020 2021
Code Obj. code Statement
CAMBRU-1 MGT-IMP-MGTPL From 2017 through 2021, continue implementing high priority management actions to: expand coastal cactus wren populations; rehabilitate habitat destroyed in the 2003 Cedar and 2007 Harris wildfires; improve connectivity within and between the Otay and San Diego/El Cajon genetic clusters (see occurrence table); and manage high risk of anthropogenic predation of adults and nestlings. These priority management actions are identified in the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan prepared in 2015.
CAMBRU-2 MON-IMP-MGTPL From 2017-2021, collect data on the effectiveness of implementing high priority management actions from the 2015 South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan. In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for the combined Otay and San Diego/El Cajon genetic clusters (see occurrence table) in south San Diego County. These results will be used in 2022 to update management recommendations and success criteria for the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan.
CAMBRU-3 MON-SURV-SPEC From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
CAMBRU-7 MGT-IMP-IEX In 2017-2021, continue supporting restoration of cactus scrub based upon ICR's Restoration Analyses for the San Pasqual Valley/Lake Hodges coastal cactus wren genetic cluster (see occurrence table) to: rehabilitate cactus scrub destroyed or degraded by the 2007 Witch Fire; to expand occurrences, particularly adjacent to Lake Hodges; to improve connectivity within the genetic cluster; and as needed, to manage high risk of anthropogenic predation of adults and nestlings.
CAMBRU-9 MGT-IMP-FMGT Implement prefire management to reduce potential severity and impacts from future fire at prioritized cactus wren occurrences and habitats most at risk from wildfire.
CAMBRU-10 MON-IMP-FMGT For at least the first 3 years following a wildfire, use a standardized survey protocol to determine the status of coastal cactus wren occurrences affected by the wildfire. Use a standardized postfire protocol to collect vegetation and other covariates important in characterizing postfire cactus scrub habitat recovery. Collect habitat recovery data at unoccupied cactus scrub sites that are important for enhancing connectivity or for future population expansion. Identify and prioritize management actions to recover wren populations and important cactus scrub habitat patches.
CAMBRU-11 MGT-IMP-FMGT For at least the first 3 years following a wildfire, implement management actions identified by postfire monitoring as necessary to protect and rehabilitate high quality cactus scrub to allow for recovery of coastal cactus wren occurrences affected by the wildfire.
regional and/or local PRE 2017, 2018, 2019, 2020, 2021 SO

MGT-IMP-NUR CAMBRU-6

Management units: 2, 3, 4, 6

From 2017-2021, continue operation of the North San Diego County Cactus Nursery and support a South San Diego County Cactus Nursery to supply cactus to land managers to enhance, restore and create coastal cactus wren habitat. Grow cactus pads, segments and entire plants sufficient for restoration projects to expand and enhance cactus scrub habitat and as a source of plants for immediate habitat rehabilitation following severe wildfire.
Action Statement Action status Projects
IMP-1 Implement BMPs when harvesting and growing cactus at a nursery in preparation for transplant into natural lands for cactus restoration projects and to provide an emergency source of cactus following wildfire. some occurrences are in progress North County Cactus Nursery and Coastal Cactus Wren Habitat Restoration (2015-2018)
IMP-2 Grow and supply cactus pads, segments, and entire plants from locally harvested native cactus with a composition of species reflecting what naturally occurs in each geographic area. The North County Cactus Nursery should cactus to projects in MUs 6 and 8 and those areas in MU 4 dominated by prickly pear cactus. The South County Cactus Nursery should supply cactus to MUs 2 and 3 and to those areas in MU 4 dominated by coast cholla. The amount of cactus produced will be determined periodically based upon: management recommendations from the 2015 South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan; from ICR's Restoration Analyses for the San Pasqual Valley and Lake Hodges; an evaluation of planned and ongoing cactus restoration projects; and an assessment of cactus needed to be kept in reserve for future post-fire rehabilitation efforts. some occurrences are in progress North County Cactus Nursery and Coastal Cactus Wren Habitat Restoration (2015-2018)
IMP-3 Submit project metadata, nursery plans, and reports with information on harvesting, growing and distributing cactus for restoration projects to the MSP Web Portal. some occurrences are in progress North County Cactus Nursery and Coastal Cactus Wren Habitat Restoration (2015-2018)
Criteria Deadline year
Cactus Nurseries Established in North and South San Diego County to Provide Sufficient Cactus for Restoration and PostFire Rehabilitation 2021
Code Obj. code Statement
CAMBRU-1 MGT-IMP-MGTPL From 2017 through 2021, continue implementing high priority management actions to: expand coastal cactus wren populations; rehabilitate habitat destroyed in the 2003 Cedar and 2007 Harris wildfires; improve connectivity within and between the Otay and San Diego/El Cajon genetic clusters (see occurrence table); and manage high risk of anthropogenic predation of adults and nestlings. These priority management actions are identified in the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan prepared in 2015.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
CAMBRU-7 MGT-IMP-IEX In 2017-2021, continue supporting restoration of cactus scrub based upon ICR's Restoration Analyses for the San Pasqual Valley/Lake Hodges coastal cactus wren genetic cluster (see occurrence table) to: rehabilitate cactus scrub destroyed or degraded by the 2007 Witch Fire; to expand occurrences, particularly adjacent to Lake Hodges; to improve connectivity within the genetic cluster; and as needed, to manage high risk of anthropogenic predation of adults and nestlings.
CAMBRU-11 MGT-IMP-FMGT For at least the first 3 years following a wildfire, implement management actions identified by postfire monitoring as necessary to protect and rehabilitate high quality cactus scrub to allow for recovery of coastal cactus wren occurrences affected by the wildfire.
regional and/or local NFO 2017, 2018, 2019, 2020, 2021 SO

MGT-IMP-IEX CAMBRU-7

Management units: 5, 6

In 2017-2021, continue supporting restoration of cactus scrub based upon ICR's Restoration Analyses for the San Pasqual Valley/Lake Hodges coastal cactus wren genetic cluster (see occurrence table) to: rehabilitate cactus scrub destroyed or degraded by the 2007 Witch Fire; to expand occurrences, particularly adjacent to Lake Hodges; to improve connectivity within the genetic cluster; and as needed, to manage high risk of anthropogenic predation of adults and nestlings.
Action Statement Action status Projects
IMP-1 Following best practices, design cactus scrub enhancement and restoration projects to provide high quality nesting and foraging habitat with large patches of cacti >1 m tall in a mosaic of open scrub that provides sufficient food resources for reproduction and survival, especially during drought years when arthropod food resources are limiting. As they become available, incoporate the results from the Cactus Wren Demography, Foraging and Arthropod Study to create restoration palettes that favor plant species associated wtih important wren food resources. Design planting layouts to maximize water availability by allocating a portion of the plantings to more mesic sites, such as ravines, at the bottom of slopes, and on northerly and easterly aspects. Control invasive nonnative plants to =20% absolute cover to reduce competition with native plants for water and light. in progress Hodges Reservoir-Bernardo Bay Cactus Wren Habitat Restoration Grant Project
IMP-2 Implement management actions, as needed, to reduce anthropogenic predation on wrens and their nests in fragmented habitats bordered by development where wrens are vulnerable to predation by cats, Cooper's hawks, corvids and other human-subsidized predators. Actions could include removing selected trees within or bordering cactus scrub that provide hunting, roosting, and nesting perches for hawks and corvids and avoiding cactus scrub restoration in areas where the terrain and location make wrens especially vulnerable to predation. Other measures could involve humanely removing feral cats from Conserved Lands and providing educational material and signage encouraging neighboring homeowners to keep their cats indoors so that wrens are protected and cats are safe from predation by wild animals, such as coyotes. in progress Hodges Reservoir-Bernardo Bay Cactus Wren Habitat Restoration Grant Project
Criteria Deadline year
By 2021, =2 High Priority Management Actions Implemented from ICR's Restoration Analyses for the San Pasqual Valley and Lake Hodges 2021
Code Obj. code Statement
CAMBRU-3 MON-SURV-SPEC From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
CAMBRU-5 MON-RES-GEN From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
CAMBRU-6 MGT-IMP-NUR From 2017-2021, continue operation of the North San Diego County Cactus Nursery and support a South San Diego County Cactus Nursery to supply cactus to land managers to enhance, restore and create coastal cactus wren habitat. Grow cactus pads, segments and entire plants sufficient for restoration projects to expand and enhance cactus scrub habitat and as a source of plants for immediate habitat rehabilitation following severe wildfire.
CAMBRU-8 MON-IMP-MGTPL From 2017-2021, collect data on the effectiveness of implementing high priority management actions to restore cactus scrub to expand coastal cactus wren populations and enhance connectivity within the San Pasqual Valley/Lake Hodges genetic cluster (see occurrence table). In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for north San Diego County. Use these results to develop a management strategy that will provide the basis for preparing a North County Coastal Cactus Wren Habitat Conservation and Management Plan in 2022.
CAMBRU-9 MGT-IMP-FMGT Implement prefire management to reduce potential severity and impacts from future fire at prioritized cactus wren occurrences and habitats most at risk from wildfire.
regional and/or local NFO 2017, 2018, 2019, 2020, 2021 SO

MON-IMP-MGTPL CAMBRU-8

Management units: 5, 6

From 2017-2021, collect data on the effectiveness of implementing high priority management actions to restore cactus scrub to expand coastal cactus wren populations and enhance connectivity within the San Pasqual Valley/Lake Hodges genetic cluster (see occurrence table). In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for north San Diego County. Use these results to develop a management strategy that will provide the basis for preparing a North County Coastal Cactus Wren Habitat Conservation and Management Plan in 2022.
Action Statement Action status Projects
IMP-1 Collect vegetation data to document success of cactus scrub restoration projects. This can include monitoring the height, diameter and survival of planted cactus and the composition and percent cover of native and nonnative shrubs, forbs and grasses. Document wren use of restored cactus scrub. some occurrences are in progress
IMP-2 Submit restoration and enhancement project metadata, management datasets, and reports to the MSP Web Portal. some occurrences are in progress
IMP-3 Conduct a meta-analysis of habitat restoration data and cactus wren population survey data to determine whether short-term success criteria have been achieved for habitat restoration actions and for wren populations in north San Diego County. Based upon these results, prepare recommendations for a 2022-2031 management strategy for coastal cactus wren. These broad recommendations can be used in 2022 to prepare a North San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan with specific, prioritized management actions. waiting for precedent action
IMP-4 Submit cactus wren habitat restoration and population meta-analysis datasets, results, and management strategy recommendations for north San Diego County to the MSP Web Portal. waiting for precedent action
Criteria Deadline year
Success Criteria 2013-2021: Restore =75 Acres of High Quality Cactus Scrub and Increase the San Pasqual Valley/Lake Hodges Genetic Cluster to =90 Territories on Conserve 2021
Code Obj. code Statement
CAMBRU-3 MON-SURV-SPEC From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
CAMBRU-5 MON-RES-GEN From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
CAMBRU-7 MGT-IMP-IEX In 2017-2021, continue supporting restoration of cactus scrub based upon ICR's Restoration Analyses for the San Pasqual Valley/Lake Hodges coastal cactus wren genetic cluster (see occurrence table) to: rehabilitate cactus scrub destroyed or degraded by the 2007 Witch Fire; to expand occurrences, particularly adjacent to Lake Hodges; to improve connectivity within the genetic cluster; and as needed, to manage high risk of anthropogenic predation of adults and nestlings.
CAMBRU-9 MGT-IMP-FMGT Implement prefire management to reduce potential severity and impacts from future fire at prioritized cactus wren occurrences and habitats most at risk from wildfire.
regional and/or local PRE 2017, 2018, 2019, 2020, 2021 SO

MGT-IMP-FMGT CAMBRU-9

Management units: 2, 3, 4, 5, 6

Implement prefire management to reduce potential severity and impacts from future fire at prioritized cactus wren occurrences and habitats most at risk from wildfire.
Action Statement Action status Projects
IMP-1 Implement management actions to reduce severity of potential fires through opening up dense cactus scrub habitats by trimming and thinning shrubs to maintain open scrub, maintaining bare ground buffers around large intact cactus patches, and by reducing nonnative grasses and herbs that can carry wildfire into cactus patches. Design management actions to avoid significant impacts to CSS vegetation or to other MSP species. Available for implementation
IMP-2 As opportunities arise, implement management actions to reduce potential fire impacts in conjunction with other ongoing enhancement and restoration projects for cactus wrens. Available for implementation
IMP-3 Submit project metadata and management actions to the MSP Web Portal. Available for implementation
Criteria Deadline year
By 2021, Implement =1 Management Action to Reduce Impacts from Future Fire at Prioritized Wren Occurrences 2021
Code Obj. code Statement
CAMBRU-1 MGT-IMP-MGTPL From 2017 through 2021, continue implementing high priority management actions to: expand coastal cactus wren populations; rehabilitate habitat destroyed in the 2003 Cedar and 2007 Harris wildfires; improve connectivity within and between the Otay and San Diego/El Cajon genetic clusters (see occurrence table); and manage high risk of anthropogenic predation of adults and nestlings. These priority management actions are identified in the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan prepared in 2015.
CAMBRU-2 MON-IMP-MGTPL From 2017-2021, collect data on the effectiveness of implementing high priority management actions from the 2015 South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan. In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for the combined Otay and San Diego/El Cajon genetic clusters (see occurrence table) in south San Diego County. These results will be used in 2022 to update management recommendations and success criteria for the South San Diego County Coastal Cactus Wren Habitat Conservation and Management Plan.
CAMBRU-3 MON-SURV-SPEC From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
regional and/or local POST 2017, 2018, 2019, 2020, 2021 SO

MON-IMP-FMGT CAMBRU-10

Management units: 2, 3, 4, 5, 6

For at least the first 3 years following a wildfire, use a standardized survey protocol to determine the status of coastal cactus wren occurrences affected by the wildfire. Use a standardized postfire protocol to collect vegetation and other covariates important in characterizing postfire cactus scrub habitat recovery. Collect habitat recovery data at unoccupied cactus scrub sites that are important for enhancing connectivity or for future population expansion. Identify and prioritize management actions to recover wren populations and important cactus scrub habitat patches.
Action Statement Action status Projects
IMP-1 Prepare postfire habitat monitoring protocols and sampling design to determine the status of coastal cactus wrens and characterize cactus scrub recovery following wildfire. Use the monitoring results to identify management actions to ensure postfire recovery of high quality cactus scrub at occupied cactus wren sites and at unoccupied cactus scrub sites important for wren population expansion and connectivity within and between genetic clusters. On hold
IMP-2 Submit project metadata, cactus wren postfire survey and habitat monitoring data, annual reports with management recommendations, and a final report documenting project methods and results to the MSP Web Portal. On hold
Criteria Deadline year
At Least 3 Years of Postfire Monitoring of Cactus Wrens and Habitats with Annual Management Recommendations 2021
Code Obj. code Statement
CAMBRU-3 MON-SURV-SPEC From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
CAMBRU-5 MON-RES-GEN From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
CAMBRU-8 MON-IMP-MGTPL From 2017-2021, collect data on the effectiveness of implementing high priority management actions to restore cactus scrub to expand coastal cactus wren populations and enhance connectivity within the San Pasqual Valley/Lake Hodges genetic cluster (see occurrence table). In 2021, compile data from all restoration projects and determine the effectiveness of cumulative management actions for north San Diego County. Use these results to develop a management strategy that will provide the basis for preparing a North County Coastal Cactus Wren Habitat Conservation and Management Plan in 2022.
regional and/or local POST 2017, 2018, 2019, 2020, 2021 SO

MGT-IMP-FMGT CAMBRU-11

Management units: 2, 3, 4, 5, 6

For at least the first 3 years following a wildfire, implement management actions identified by postfire monitoring as necessary to protect and rehabilitate high quality cactus scrub to allow for recovery of coastal cactus wren occurrences affected by the wildfire.
Action Statement Action status Projects
IMP-1 Implement management actions to restore cactus scrub habitat destroyed by wildfire. These management actions may include planting large >1m cactus to create nesting and roosting habitat for immediate postfire use by cactus wrens, planting pads and segments to improve habitat over the longer term, and to seed or plant native shrubs and forbs as needed to enhance habitat suitability and increase available arthropod food resources (use recommendations from the Coastal Cactus Wren Demography, Vegetation and Arthropod Study). Control invasive nonnative plants to =20% absolute cover to reduce postfire invasion of nonnative plants and to allow postfire recovery of native plants by reducing competition for water and light. Control erosion and human use impacts while habitat is recoverying. On hold
IMP-2 Submit project metadata and management actions to the MSP Web Portal. On hold
Criteria Deadline year
At Least 3 Years of Postfire Management in Priority Cactus Wren Habitats 2021
Code Obj. code Statement
CAMBRU-3 MON-SURV-SPEC From 2017 to 2021, use a standardized protocol to survey for cactus wrens to determine territory, pairing and banding status and collect habitat covariate data in cactus scrub habitats on Conserved Lands in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). In 2018 and 2021, expand surveys to include the San Pasqual Valley/Lake Hodges genetic cluster.
CAMBRU-4 MON-RES-SPEC From 2017 to 2019, continue the Coastal Cactus Wren Demography, Vegetation and Arthropod Study begun in 2015 to investigate relationships between habitat quality and wren reproduction, dispersal and survival in the Otay and San Diego/El Cajon genetic clusters (see occurrence table). Habitat quality is measured at the territory scale and characterized by vegetation attributes, arthropod community composition, nestling diet, and potential availability of arthropod prey based on plant associations. Use the results to develop specific restoration recommendations to enhance habitat suitability and food resources important to cactus wren reproduction and survival.
CAMBRU-5 MON-RES-GEN From 2017-2019, in conjunction with standardized surveys and with banding activities for the Coastal Cactus Wren Demography, Vegetation and Arthropod Study, collect feather or blood samples from nestling and adult cactus wren at sites where wrens were sampled in 2011-2012 for the Southern California Cactus Wren Genetics Study (Barr et al. 2013, 2015). Determine if genetic diversity and effective population size have changed in the Otay, San Diego/El Cajon, and San Pasqual genetic clusters (see occurrence table) and evaluate whether there are potential threats to long-term population sustainability from inbreeding. Based on these results, prepare specific recommendations for managing gene flow and/or population expansion to enhance genetic diversity and effective population size.
CAMBRU-6 MGT-IMP-NUR From 2017-2021, continue operation of the North San Diego County Cactus Nursery and support a South San Diego County Cactus Nursery to supply cactus to land managers to enhance, restore and create coastal cactus wren habitat. Grow cactus pads, segments and entire plants sufficient for restoration projects to expand and enhance cactus scrub habitat and as a source of plants for immediate habitat rehabilitation following severe wildfire.
CAMBRU-7 MGT-IMP-IEX In 2017-2021, continue supporting restoration of cactus scrub based upon ICR's Restoration Analyses for the San Pasqual Valley/Lake Hodges coastal cactus wren genetic cluster (see occurrence table) to: rehabilitate cactus scrub destroyed or degraded by the 2007 Witch Fire; to expand occurrences, particularly adjacent to Lake Hodges; to improve connectivity within the genetic cluster; and as needed, to manage high risk of anthropogenic predation of adults and nestlings.
CAMBRU-10 MON-IMP-FMGT For at least the first 3 years following a wildfire, use a standardized survey protocol to determine the status of coastal cactus wren occurrences affected by the wildfire. Use a standardized postfire protocol to collect vegetation and other covariates important in characterizing postfire cactus scrub habitat recovery. Collect habitat recovery data at unoccupied cactus scrub sites that are important for enhancing connectivity or for future population expansion. Identify and prioritize management actions to recover wren populations and important cactus scrub habitat patches.