Accession Number : AD0717267

Title :   Faunal Communities on the Central California Continental Shelf Near San Francisco. A Sedimentary Environmental Study.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY HYDRAULIC ENGINEERING LAB

Personal Author(s) : Yancey,T. ; Wilde,P.

Report Date : DEC 1970

Pagination or Media Count : 69

Abstract : Correlation of identity and numbers of organic hard parts with bottom sedimentary environments from 50 sediment samples from the San Francisco offshore bar and adjacent areas in the Gulf of the Farallones of the Central California continental shelf permit the subdivision of this region into three faunal communities. (1) The hard substrate community, in areas of rocky bottoms shows the greatest faunal diversity, particularly in molluscs, and the highest percentage of organic hard parts. (2) The shelf community, in fine grained sediments found in water depths greater than 40 feet, is the most widespread characterized by relatively low productivity. (3) The bar community on relatively sandy bottoms on the San Francisco bar and near Mussel Rock shows variable productivity with a preponderance of echnoid parts and juveniles particularly of arthropods and molluscs. (Author)

Descriptors :   (*AQUATIC ANIMALS, *OCEAN BOTTOM), (*ECOLOGY, OCEAN BOTTOM), ECHINODERMATA, MOLLUSCA, SEDIMENTATION, CALIFORNIA, ENVIRONMENT, ARTHROPODA

Subject Categories : Biological Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE