Diablo Canyon power plant site ecological study; Annual Report, Part 1, July 1, 1975 - June 30, 1976 and Quarterly Rreport No. 12, April 1, 1976 - June 30, 1976

Gotshall, Daniel W. and Laurent, Laurence L. and Wendell, Fred E. (1977) Diablo Canyon power plant site ecological study; Annual Report, Part 1, July 1, 1975 - June 30, 1976 and Quarterly Rreport No. 12, April 1, 1976 - June 30, 1976. Fort Bragg, CA, California Department of Fish and Game, Marine Resources Region, (Marine Resources Administrative Report, 77-18)

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Abstract

Project efficiency was enhanced along with economic savings through reduced per diem costs with the move of two project biologists to the Diablo Canyon area. A total of 765 field and laboratory man-days was spent surveying 189 intertidal, subtidal, and fishing stations, processing algae samples, and compiling data. A new subtidal study of random 1/4m2 quadrats was begun this year to better assess small invertebrates. Three new permanent intertidal stations were established in transition areas outside of Diablo Cove to monitor thermal impact on abalones. Giant red sea urchin densities continued to decline in both subtidal study areas, while densities of large brown algae continued to increase. Numbers of intertidal black and red abalones from parallel to shoreline stations showed little change. Perpendicular to shore stations yielded higher mean densities of black abalones than the parallel stations. Sea otter movements and fluctuations in monthly counts generally paralleled those of previous years. The commercial sea urchin fishery was inactive most of the year, and commercial abalone fishing effort continued to decline. No effort from either fishery was observed in Diablo Cove. Observations on natural and power plant produced foam within Diablo Cove were begun during this report period.

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