Restoration Project

Get Inspired - Laguna Beach

Restoration Objective:

The objective of these restoration efforts was to remove urchins in order to restore giant kelp habitat for environmental purposes, and to enhance local recreational diving.

Site Selection Criteria:

The restoration site is a large reef that is popular among recreational divers. The reef is composed of exposed rocky reef with canyons and crevices. The toe of the reef extends south from shore to a depth of about 15m and many areas of the reef reach up to the surface and are exposed during big swells or low tides. Despite the fact that adjacent kelp forests have been restored, this reef was barren as of the summer 2010.

Cause Of Decline:

Seaweed beds play an important role in biological production, water quality purification and sediment stabilisation. Furthermore, seaweed beds contribute to the increase in catches of useful seafoods. Due to coastal development or coastal environment degradation, marine vegetation is decreasing.

Key Reasons For Decline:

Overgrazing

Scientific Paper

Annual Restoration report for CADFG

Nancy Caruso, .

Organisation:

Get Inspired

Site Observations:

Observation Date

10th Jan 2010 – 15th Oct 2011

Action Summary:

A total of 16,265 urchins (1225 S. franciscanus and 15,033 Arbacia incisa) were removed over 7 dives by volunteers, and relocated out of the area.

Lessons Learned:

This study includes counts of different algal species, fish and invertebrates (e.g. urchins, welks, sea cucumbers, anemones etc).

Project Outcomes:

Counts of Macrocystis pyrifera increased over the study year from the original pre-restoration counts. Kelp density had increased by 85% in April of 2011 and then again by 77% in October 2011 from original kelp densities.

Key Reasons For Decline:

Overgrazing

Indicator Data:

Indicator:

Ending Value:

Starting Value:

Adult Kelp Density

1.7
/ m2
0.07
/ m2
Costings:
Cost Currency:USD