Restoration Project

University of California Institute of Marine Science - Palos Verdes

Restoration Objective:

The objective of this study was to determine the effectiveness of liming on urchin control, and to test possible harmful side effects to other species.

Site Selection Criteria:

Sites were selected that had previous kelp cover, close proximity to remnant kelp beds and high urchin densities.

Key Reasons For Decline:

Ocean warming

Scientific Paper

Kelp Habitat Improvement Project Final Report 1 Dec., 1963

W. North, .


University of California Institute of Marine Science

Site Observations:

Observation Date

26th May 1962 – 2nd Nov 1962

Action Summary:

700 pounds of quicklime was distributed from the stern of a towed skiff, killing 90-95% of urchins. Urchins were removed every 2-3 weeks.

Lessons Learned:

The Palos Verdes site had most successful regeneration due to its proximity to a healthy Macrocystis bed.

Project Outcomes:

Ectocarpus regenerated in April. In May, many Macrocystis juveniles were observed. During June, more Macrocystis individuals appeared. By the first week of July, Macrocystis growth was 10-15 feet high. On August 19th and 22nd, sporophytes were counted in quadrats 1 and 2, and most were identified as Macrocystis.

Key Reasons For Decline:

Ocean warming

Area of Restoration (In Square Metres)


Indicator Data:


Ending Value:

Starting Value:

Adult Kelp Count

Cost Currency:USD