San Diego Management & Monitoring Program


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2005 Variegated Dudleya (Dudleya variegata) on San Diego National Wildlife Refuge report

Lead author: John Martin
Report of a 2005 DUVA population in an on-going long term monitoring study on the San Diego national Wildlife Refuge.

2016 Dehesa Nolina (Nolina interrata) and Variegated Dudleya (Dudleya variegata) Augmentation report

Dehesa nolina (Nolina interrata) and variegated dudleya (Dudleya variegata) are narrow endemic species that are priorities for management under the San Diego Management and Monitoring Program’s Management Strategic Plan for western San Diego County. Both species declined precipitously on the South Crest Preserve after fire and subsequent invasion by nonnative plants. To stabilize and increase populations, CBI conducted a 3-year program that included seed collection, nursery propagation, and outplanting of nursery-grown plants into restored habitat.

2012 2012 Biological Monitoring Status Report Crestridge Ecological Reserve and South Crest Properties report

In 2012, the Conservation Biology Institute (CBI) conducted covered species monitoring and management on the Crestridge Ecological Reserve (CER) and South Crest properties (South Crest) in San Diego County, California. Covered species monitoring focused on detecting and/or assessing the status of four MSCP covered plant species: San Diego thornmint (Acanthomintha ilicifolia), Lakeside ceanothus (Ceanothus cyaneus), variegated dudleya (Dudleya variegata), and Dehesa beargrass (Nolina interrata). Survey and monitoring strategies included presence/absence surveys, and baseline and core monitoring (including photomonitoring). One additional sensitive plant was mapped on South Crest: rush-like bristleweed (Xanthisma junceum ). Covered species management was conducted on both CER and South Crest for San Diego thommint. Presence/absence surveys were conducted for San Diego thommint, a federally threatened and state endangered species on CER and South Crest. On CER, we revisited the small population found on the slopes above Rios Canyon ('Thommint Hill') in 2010 and 2011, and searched adjacent, suitable habitat for additional stands. San Diego thommint was detected within the 2010/2011 stand boundary; six individuals were detected and five survived to produce flowers. We did not detect thornmint elsewhere onsite. Much of the formerly suitable habitat is now dominated by the nonnative grass, purple falsebrome (Brachypodium distachyon ). Monitoring within this small stand included both baseline and core monitoring to document the population boundaries and current status, including threats. Recommendations include continued monitoring and weed control efforts, and possibly, population augmentation via seed. On South Crest, surveys assessed all historic locations and potentially suitable habitat in and around Skeleton Flats. Although San Diego thornmint was not detected in historic locations, two new occurrences were detected in the low-lying hills just east of Skeleton Flats. The larger occurrence consists of approximately 950 plants and the smaller occurrence supports about 185 plants. Baseline monitoring and elements of core monitoring were conducted for these populations. Recommendations include continued monitoring and weed control efforts. Lakeside ceanothus occurs only on CER. In 2012, we continued the photomonitoring program initiated in 2010. Monitoring was conducted at seven locations and compared to 2010 and 2011 results. In three locations, nonnative pl

2012 Biological Monitoring Status Report for Crestridge Ecological Reserve and South Crest Properties report

In 2012, the Conservation Biology Institute (CBI) conducted covered species monitoring and management on the Crestridge Ecological Reserve (CER) and South Crest properties (South Crest) in San Diego County, California. Covered species monitoring focused on detecting and/or assessing the status of four MSCP covered plant species: San Diego thornmint (Acanthomintha ilicifolia), Lakeside ceanothus (Ceanothus cyaneus), variegated dudleya (Dudleya variegata), and Dehesa beargrass (Nolina interrata). Survey and monitoring strategies included presence/absence surveys, and baseline and core monitoring (including photomonitoring). One additional sensitive plant was mapped on South Crest: rush-like bristleweed (Xanthisma junceum). Covered species management was conducted on both CER and South Crest for San Diego thommint.

2012 Covered and Invasive Species Management: Crestridge Ecological Reserve and South Crest Properties (TASKS 1-4: Covered Species Mapping, Invasive Species Mapping, Invasive Plant Control, and Early Detection Plan) report

The Conservation Biology Institute (CBI) and partners conducted covered and invasive species mapping, monitoring, and management on the Crestridge Ecological Reserve (CER) and South Crest properties (South Crest) in 2011 and 2012 as part of a Transnet EMP Grant (contract no. 5001586). This document functions as the final report for the following tasks: Task 1 - Invasive Species Mapping. Task 2 - Covered Species Mapping. Task 3 - Invasive Plant Control. Task 4 - Early Detection Plan. Under Task 1, a total of 25 invasive plant species of concern were mapped on the subject properties, including 21 species on CER and 14 species on South Crest. An additional high priority invasive plant was documented just south of the South Crest boundary. The invasives mapping provides a baseline against which to measure the effectiveness of management actions. Under Task 2, four covered plant species were mapped on the South Crest properties: Dehesa beargrass (Nolina interrata), Parry's tetracoccus (Tetracoccus dioicus), San Diego thornmint (Acanthomintha ilicifolia), and variegated dudleya (Dudleya variegata). The focus of this mapping effort was to assess the post-Cedar Fire status of these populations, including distribution and threats, and to recommend management actions, if necessary. Task 3 dealt specifically with invasives control and included focused treatments in four areas on CER: (1) a 10-acre grassland restoration site; (2) 5 acres of coastal sage scrub undergoing post-fire restoration; and (3) 5 acres of a coast live oak/Engelmann oak grove; and (4) San Diego thornmint habitat on Thornmint Hill. Task 4 included development of an Early Detection Plan (EDP) and initiation of surveillance surveys. The EDP establishes a system of surveillance (early detection), assessment, and action (rapid response) to prevent the introduction and spread of new invasive plant species on CER and South Crest, prevent the spread of existing invasive plant species into new locations on these sites, and respond quickly to identified invasive species threats.