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Oxygen consumption and production and carbon fixation by micro-organisms were rneasured simultaneously in coastal surface waters near the Antarctic Peninsula. Although there was a good qualitative aqreement between the oxyqen and carbon measurements, total daily water-column integrated carbon incorporation measured by radiocarbon uptake in the particulate fraction underestirnated net cornrnunity production measured by the oxygen rnethod by 29 to 54 % (using a photosynthetic quotient of 1.5). Unaccounted-for exudation of dissolved organic carbon dunng the 14C uptake experirnents rnay explain this discrepancy. Respiratory carbon losses by micro-organisrns (largely phytoplankton) ranged between 10 and 50 % of gross production, the highest values corresponding to the more productive stations. These estimates are, however, slightly conservative. since they refe; to the upper 30 m of the water column, corresponding approximately to the euphotic zone in this region. Our results show that microbial respiration is an important part of the carbon flux of coastal Antarctic plankton. Unless it is considered in carbon flux models, the contribution of higher trophic levels to the ~-rh~~ f!>zel il: =zTi;?e feGd T,.;&~ muy be ser';9Gs!y vieFest&TL.at&,

marine ecology. progress series

Planktonic primary production and microbial respiration measured by 14C assimilation and dissolved oxygen changes in coastal waters of the Antarctic Peninsula during austral summer:implications for carbon flux studies