Landry, M. R.. Department of Oceanography, Univ. of Hawaii at Manoa, landry@soest.hawaii.edu
Brown, S. R.. Department of Oceanography, Univ. of Hawaii at Manoa,
Selph, K. E.. Department of Oceanography, Univ. of Hawaii at Manoa,
Allen, C. B.. Department of Oceanography, Univ. of Hawaii at Manoa,
Calbet, A. Department of Oceanography, Univ. of Hawaii at Manoa,
Nolla, H. A.. Department of Oceanography, Univ. of Hawaii at Manoa,
Nunnery, S. Department of Oceanography, Univ. of Hawaii at Manoa,

 
PHYTOPLANKTON GROWTH AND MICROZOOPLANKTON GRAZING IN THE ANTARCTIC POLAR FRONT ZONE DURING AUSTRAL SUMMER 1997-98
 
Phytoplankton growth and microzooplankton grazing were investigated as part of the U.S. JGOFS Polar Front cruises from November 1997 to March 1998. Rate estimates were determined from chlorophyll changes in seawater dilution incubations, as well as changes in flow cytometric cell counts and taxon-specific pigments. Phytoplankton growth showed a temperature-dependent increasing trend with time, varying from a mean of about 0.2 d^-1 early in the season to >0.4 d^-1 in mid-February. Microzooplankton grazing followed a similar pattern, varying from about 0.1 to >0.2 d^-1 over the growing season. On average, microzooplankton consumption accounted for about 60% of phytoplankton production over the course of the study, but the percentage varied from <20 to >100% at various places in time and space, leaving net rates ranging from -0.1 to +0.2 d^-1. Measured net rates are consistent with the observed in situ rates of change of phytoplankton standing stocks in the vicinity of 60^o S during November 1997 and with those of a migrating bloom feature during mid-summer.
 
Day: Friday, Feb. 5
Time: 02:45 - 03:00pm
Location: Sweeney Center
 
Code: SS31FR0245S