Accession Number : ADA319639

Title :   Concentration of Pelagic Copepods in the Santa Barbara Basin.

Descriptive Note : Final technical rept. 1 Oct 94-30 Sep 96,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA CENTER FOR COASTAL STUDIES

Personal Author(s) : Osgood, Kenric

PDF Url : ADA319639

Report Date : 30 DEC 1996

Pagination or Media Count : 2

Abstract : A combination of instruments (zooplankton nets, optical plankton counter, and acoustic Doppler current profiler) was used to asses the temporal and spatial extent of a dense, deep aggregation of diapausing, C5 Calanus pacificus in the Santa Barbara Basin (SB B) and to determine whether the abundances of C. pacificus and/or other copepods are elevated within the SBB compared to nearby locations. The study found high concentrations of diapausing, C5 C. pacificus built up in the deep waters of the SBB during the summer and into the fall. During the buildup, the deep aggregation moved up from the bottom as the oxygen became depleted in the basin's deep waters. The deep aggregation apparently builds up due to the basin trapping C5s that migrate below the sill depth from water advected over the basin. The C5s are retained within the basin until they swim, or are forced, above the sill depth. The concentrations of diapausing C5s in the deep waters outside the SBB stayed approximately constant during the summer and fall. No other zooplankter was concentrated in the SBB like the C5 C. pacificus were.

Descriptors :   *ACOUSTIC WAVES, *MARINE BIOLOGY, *DOPPLER EFFECT, *ZOOPLANKTON, *PLANKTON, HIGH RATE, WATER, OXYGEN, PROFILES, CONCENTRATION(COMPOSITION), INSTRUMENTATION, DEEP WATER, BASINS(GEOGRAPHIC), SUMMER, NETS.

Subject Categories : Biology
      Microbiology
      Biological Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE