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The structure and grazing dynamics of mlcrozooplankton were investigated a t 15 stations during the SAAMES I11 cruise to the region of the Subtropical Convergence (STC) and across a warmcore eddy in subantarctic waters durlng austral winter (June/July) 1993. Microzooplankton abundance CO-vaned with the combined concentration of the nanoand picophytoplankton size fract~ons Nanoflagellates dominated numerically at all stations while the >20 pm fraction was generally dominated by ciliates (oligotrichs and tintinnids). Mixotrophs comprised between 0 and 5 % of total chlorophyll concentration. Production in the region showed a weak seasonal trend with the except~on of s ta t~ons in the vicinity of the STC. Instantaneous growth and grazing coefficients exhibited clear spatial trends, with the highest rates recorded a t the edge of the eddy and in the region of the STC. Instantaneous grazing rates at stations at the edge of the eddy and at the STC varied from 0.347 to 0.701 d-', equivalent to a loss of 30 to 51 '',> of the initial standing stock and between 56 and 69"A of the potential primary production In the warm-core eddy, subantarctic and Agulhas waters, instantaneous grazing rates ranged fl-om 0.281 to 0.433 d-l. Thls is equivalent to a loss of 24 to 35% of the initial standing stock and between 59 and 83% of the potential primary production Slze selectivity experiments suggest that m~crozooplankton preferentially graze on the picoand nanophytoplankton size fract~ons. The results of this study show that the bulk of photosynthetically fixed carbon IS channelled into the microbial loop during austral winter. This implies that the carbon pump IS relatively inefficient d u r ~ n g winter and th.at atmospheric CO2 draludown via sinking of organic matter into deep water may be very limited in this area.

marine ecology. progress series

Structure and grazing of the microzooplankton communities of the Subtropical Convergence and a warm-core eddy in the Atlantic sector of the Southern Ocean