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Pasulka, A. L., Scripps Institution of Oceanography, La Jolla, CA, USA, apasulka@ucsd.edu
Taniguchi, D. A., Scripps Institution of Oceanography, La Jolla, USA, datanigu@ucsd.edu
Taylor, A. G., Scripps Institution of Oceanography, La Jolla, USA, agtaylor@ucsd.edu
Landry, M. R., Scripps Institution of Oceanography, La Jolla, USA, mlandry@ucsd.edu

TEMPORAL VARIATIONS IN THE MICROPLANKTON COMMUNITY IN THE OLIGOTROPHIC SUBTROPICAL OPEN OCEAN AND POTENTIAL ENVIRONMENTAL FACTORS INFLUENCING THESE VARIATIONS

As part of the Hawaii Ocean Time Series (HOT) program, we examined population abundances and biomass of protistan microplankton (2-40 μm cells) at Station ALOHA for 5 annual cycles (2004 to 2009). We used epifluorescence microscopy to determine the temporal variability in autotrophic and heterotrophic biomasses, as well as taxon-specific patterns for some groups, including prymnesiophytes, diatoms, dinoflagellates and Crocosphaera. Although chlorophyll fluoresecence remains fairly constant throughout the year with a maximum around 100 m, total autotroph cell concentration and biomass show substantial seasonal fluctuations, correlated with mixed layer depth. Deepening of the mixed layer in winter results in increased cell abundance and biomass. Maximum biomass is centered around 80 m, but the winter increase spans a greater depth range than the rest of the year. Prymnesiophytes are abundant throughout the year with an average depth integrated biomass of 386 ugC/L, whereas Crocosphaera cells increase seasonally between September and November. The addition of epifluorescence microscopy data to the suite of measurements already examined at station ALOHA allows for a more refined picture of the seasonal and inter-annual variability that occurs in this region of the Pacific Ocean.

Poster presentation

Session #:S02
Date: 02-17-2011
Time: 16:00 - 18:00

Presentation is given by student: Yes

PosterID: 247