Typescript.
Includes vita and abstract.
Bibliography: Includes bibliographical references (leaves 84-88).
Description: x, 88 leaves : ill. ; 29 cm. / Along the Oregon coast blooms of Pseudo-nitzschia spp. have been an almost
annual occurrence since monitoring began in the late 80's. This study looks at the
distribution of Pseudo-nitzschia spp., in relation to meteorological and oceanographic
conditions. A series of transects (1995-98) were done in Coos Bay and over the adjacent
continental shelf under a variety of oceanographic conditions. An intense sampling
program was undertaken in June 1998, with simultaneous nearshore and in bay (Coos
Bay) sampling, including a nearshore grid, 24 hour anchor station in the bay, and an in
bay incoming tide drift study.
The results suggest that blooms develop nearshore after upwelling events. In
conditions of relaxed upwelling highest cell concentrations were found immediately
adjacent to the coast in surface and mid-depth waters. At stations in Coos Bay, Pseudonitzschia
spp. concentrations increased with the incoming tide. Nearshore phytoplankton
populations were transported into the bay, initially in the more saline bottom waters, but
were rapidly mixed throughout the water column by the turbulent flow in the channels.
On ebbing tides there was a reduced number of phytoplankton in the water column,
possibly indicating consumption by in bay filter feeders or sinking and deposition on the
bottom.
| Identifer | oai:union.ndltd.org:uoregon.edu/oai:scholarsbank.uoregon.edu:1794/9811 |
| Date | January 1999 |
| Creators | Cziesla, Christopher A., 1969- |
| Publisher | Thesis (M.S.)--University of Oregon, 1998. |
| Source Sets | University of Oregon |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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