Harris, S. L. University of British Columbia, shharris@unixg.ubc.ca
Varela, D. L. University of British Columbia, varela@unixg.ubc.ca
Harrison, P. J. University of British Columbia, pharrisn@unixg.ubc.ca

 
SIZE-FRACTIONATED PRIMARY PRODUCTIVITY IN AN UPWELLING REGIME OFF THE WEST COAST OF VANCOUVER ISLAND (CANADA)
 
Size-fractionated primary productivity was measured in an upwelling regime off the west coast of Vancouver Island (Canada) on a total of six cruises during 1997 and 1998 as part of the canadian Global Ocean Ecosystem Dynamics Program. Physical characteristics, dissolved nutrients, size fractionated chlorophyll a, phytoplankton composition and rates of primary productivity by two size fractions were measured along four inshore-offshore transects. At stations over the continental shelf (<200 m), >70% of the daily photosynthetic rates was associated with the >5 um size fraction. This larger size fraction was dominated by Pseudonitzchia sp. and Chaetoceros sp. At offshore stations, >70% of the daily photosynthetic rates was attributed to the <5 um size fraction which was dominated by nanoflagellates. Therefore, there is a community structure transition between inshore and offshore regions. Upwelling indices derived from physical and chemical characteristics will be utilized to evaluate the seasonal and interannual trends of productivity rates along the transects.
 
Day: Thursday, Feb. 4
Time: Poster
Location: Sweeney Center
 
Code: CS62TH1184S