Concentration of Pelagic Copepods in the Santa Barbara Basin.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 30, 1996
- Accession Number
- ADA319639
Entities
People
- Kenric Osgood
Organizations
- Scripps Institution of Oceanography