The Spring Phytoplankton Bloom in the Coastal Temperate Ocean: Growth Criteria and Seeding from Shallow Embayments |
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Authors: | Debby Ianson Stephen Pond Timothy Parsons |
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Institution: | (1) Earth and Ocean Sciences Department, University of British Columbia, BC, Canada;(2) Institute of Ocean Sciences, Sidney, BC, Canada |
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Abstract: | A method based on time-series of conductivity, temperature and depth (CTD) profiles which successfully determines favourable
phytoplankton growth conditions for the spring bloom in nearshore temperate coastal waters was developed. The potential for
shallow embayments to influence phytoplankton species composition in larger adjacent waters was also investigated. At temperate
latitudes, such embayments should have favourable phytoplankton growth conditions earlier in the spring than open waters as
bathymetry limits vertical mixing and thus increases light availability. The study area was Nanoose Bay, which is connected
to the Strait of Georgia, British Columbia. Data were collected 2–3 times per week during the winter-spring of 1992 and 1993.
A mooring with 5 current meters was placed at the mouth of the bay in 1992. The conservation equation for a scalar was used
to estimate the balance between advective transport and biological source and sink terms. Variability in physical conditions
and biological response between years was tremendous. Results indicate that seeding from the bay was not possible in 1992
but could have been in 1993. However, to conclusively determine the importance of Nanoose Bay on the spring bloom species
composition in the Strait of Georgia, more extensive work is required.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Phytoplankton spring bloom seeding embayments advection flushing diatoms resting spores coastal temperate |
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