The impact of suspension-feeding hTereis diversicolor and non-suspension-feeding N virens on C and N dynamics in an organic-poor sediment was investigated in a controlled laboratory study simulating periods of high and low phytoplankton (Rhodononas sp.) concentration. High phytoplankton concentration resulted in a 30-fold higher deposition (clearance) of particulate C and N to the sediment inhabited by N. diversicolor than to N. virens and defaunated sediment. Concurrently, O2 consumption and NH,' + NO3-release were increased by a factor of 3 in sediment with N. dlversicolor, but only by a factor of about 1.5 in N. virens and defaunated treatments. Steady-state porewater concentrations of T C 0 2 and NH,' decreased exponentially with increasing ventilation activity of nereids.
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Christensen et al. (2000) studied this question.
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