San Diego Management & Monitoring Program

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)

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Type: report

Article abstract: 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.

Number of pages: 95

Day: 27

Month: June

Year: 2012

Prepared for: San Diego Association of Governments;

Prepared by: Conservation Biology Institute;

Keywords: Cedar Fire; invasive plants; MSCP;

Species: Parry's tetracoccus; San Diego thorn-mint; beargrass; Variegated dudleya