Nutrient limitations, microbial food webs, and biological C-pumps: suggested interactions in a P-limited Mediterranean

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Abstract
In light of evidence suggesting that both phytoplankton and bacteria in the Medi- terranean Sea are limited by the availability of phosphorus rather than of nitrogen, and that most of the P in the photic zone during summer stratification exists as dissolved organic compounds (DOP), we address the question of how these observations may interact with the 'biological pump' transporting carbon to deep waters. From theoretical considerations, the C storage via sinking particles should func- tion better in a P- than in an N-hted system. It is argued, however, that the microbial food web dur- ing summer stratification has a net accumulation of dissolved organic carbon (DOC) and DOP. The hm- ited data available suggest a high DOC : DOP value which would make downwards transport of DOC with winter deep water formation a potentially effective mechanism in C sequestration from the atmo- sphere. Part of the DOC accumulating in the photic zone appears to be readily biodegradable. This is in conflict with a simple model of phytoplankton-bacterial competition for phosphate since phyto- plankton, as an inferior competitor, would be expected to be reduced in biomass until autochthonous production of organic C falls to a level where bacteria become C-lmuted. The conflict is resolved by including microzooplankton grazing as a controlling factor of bacterial biomass.

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