Zooplankton Distribution, Transport and Population Dynamics in the California Current Off Oregon During the 2002 Upwelling Season
ProQuest, 2008 - 110 pages
The coastal upwelling region off the Oregon coast has been long recognized as a high production area, though it is not clear how currents transport and redistribute the production. High temporal and spatial resolution surveys with coupled hydrographic and zooplankton measurements provided the basis of a quantitative estimate of zooplankton biomass advection and retention in the upwelling region. This research revealed that zooplankton cross-shelf transport is highly associated with mesoscale features which are induced from the flow-topographic interaction. The offshore meandering also transports tremendous zooplankton biomass from the north of Newport, OR and the south of Crescent city, CA, and retains the production in the coastal region. A long residence time area of biomass on Heceta Bank, a submarine bank off central Oregon, was identified with a residence timescale of over 15 days estimated by the total zooplankton biomass and the transport of the biomass gradient. The biomass spectra constructed within this long residence time area from sequential surveys 7 days apart demonstrated a biomass propagation from small sizes to large sizes. The zooplankton in situ size-dependent growth and mortality rates were calculated using inverse methods. The potential production and the biomass recycling of zooplankton community were also examined.
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ZOOPLANKTON DISTRIBUTION AND TRANSPORT
ZOOPLANKTON IN SITU POPULATION DYNAMICS
153 m isobath approximately Barnes interpolation Barth BDF interpolation biomass advection biomass area biomass concentration biomass gradient advection biomass spectrum boundary calculated California Current Cape Blanco chlorophyll and zooplankton coastal area coastal region coastal upwelling convergence copepod coupled physical covariance function cross-shelf transects current fields decorrelation scale Ekman transport errors estimated euphausiid false colors growth and mortality Heceta Bank region high biomass horizontal horizontal advection indicated interpolation methods logio base long residence area Longitude Fig mesoscale survey mortality rates nearshore northern fine-scale survey offshore jet offshore transport onshore Optical Plankton Counter Oregon coast Peterson physical and biological phytoplankton population dynamics production retention scale of 33 SeaSoar size-dependent slope of biomass spatial spectra streamfunction currents survey transects temperature thermocline total biomass trophic levels upwelling areas upwelling region vertical wind Zhou and Huntley zonal zonal and meridional zooplankton abundance zooplankton biomass zooplankton community zooplankton distributions zooplankton population dynamics