Accession Number : ADA016948

Title :   Effects of Engineering Activities on the Ecology of Pismo Clams.

Descriptive Note : Miscellaneous paper,

Corporate Author : MOSS LANDING MARINE LABS CA

Personal Author(s) : Nybakken, James ; Stephenson, Mark

Report Date : SEP 1975

Pagination or Media Count : 67

Abstract : Three aspects of the ecology of Pismo clams (Tivela stultorum) were investigated in Monterey Bay, California: distribution, reproduction cycle, and age and growth. Pismo clam populations were found to be restricted to bay areas between the Salinas River and Santa Cruz. Highest densities recorded were intertidal, and subtidal clam beds were few and with low densities. Most clams appeared randomly dispersed, and different size classes did not show a vertical separation. The presence and absence of clams were shown to be correlated with beach slope and grain size. Pismo clams mature in their second year in Monterey Bay, and the primary spawning time is in September and October. The growth rate is more rapid in young clams and varies throughout the year in all size classes but is most rapid in the summer and fall.

Descriptors :   *ECOLOGY, *CLAMS, *AQUATIC ANIMALS, *SHELLFISH, MARINE BIOLOGY, DISTRIBUTION, REPRODUCTION(PHYSIOLOGY), AGING(PHYSIOLOGY), GROWTH(PHYSIOLOGY), CALIFORNIA.

Subject Categories : Biological Oceanography
      Ecology

Distribution Statement : APPROVED FOR PUBLIC RELEASE