Diablo Canyon power plant site ecological study Quarterly Report no. 17: July 1 - September 30, 1977

Gotshall, Daniel W. and Laurent, Laurence L. (1978) Diablo Canyon power plant site ecological study Quarterly Report no. 17: July 1 - September 30, 1977. Avila Beach, CA, California Department of Fish and Game, Marine Resources Region, (Marine Resources Administration Report, 78-5)

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Abstract

During the quarter a total of 38 random 30-m2 and 152 random 1/4-m2 subtidal stations were surveyed. Red abalone, Haliotis rufescens, densities remained very low. There was a continued decline in densities of giant red sea urchins, Strongylocentrotus franciscanus, in Diablo Cove as well as the North Control area. The annual shore census of bull kelp, Nereocystis luetkeana, revealed the lowest number of plants in the surface canopy in Diablo Cove since 1973. The subtidal station data supported this observation. Sea otter, Enhydra lutris, observations were continued. A small group of otters continued to raft in the Cove east of Lion Rock. Some of these otters probably forage as far south as South Cove. The survey of 11 random intertidal stations completed our Upwelling sampling effort. (16pp.)

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