California Department of Fish and Wildlife - Palos Verdes

Restoration Project

California Department of Fish and Wildlife - Palos Verdes

Restoration Objective:

The objective of restoration was to increase ecosystem services.

Cause Of Decline:

Macrocystis pyrifera beds along the southern California coast were relatively stable prior to 1940. Declines were first reported in 1945 in areas nearest major sewage outfalls. This deterioration progressively affected beds at increasing distances from the outfalls, leaving small patches. Deterioration of kelp accelerated when an influx of warm oceanic water persisted off California from 1957-1959.

Key Reasons For Decline:


Scientific Paper

The Marine plant biomass of the Pacific Northwest coast (Chapter: Kelp Restoration in Southern California)

K.C. Wilson, P.L. Haaker, D.A. Hanan

Site Observations:

Observation Date

1st Jul 1975 – 1st Jan 1977

Action Summary:

At Palos Verdes, several thousand adult and juvenile Macrocystis plants were transplanted, mass cultures were dispersed, and gill netting was used to reduce large numbers of herbivorous fishes.

Lessons Learned:

This study transplanted juvenile and adult kelp plants from healthy kelp beds to new areas and focused on sea urchin control to ensure successful transplantation.

Project Outcomes:

Macrocystis was first found in Bluff Cove on the northwest side of Palos Verdes Peninsula in May 1975. This bed grew to 0.24 ha in July 1975, to 3.92ha in January 1976, and to 15.8ha in January 1977.

Key Reasons For Decline:


Area of Restoration (Ha)


Indicator Data:


Ending Value:

Starting Value: