Abstract
The population dynamics of Nereis diversicolor (Annelida: Polychaeta) was studied at Stiffkey salt-marshes (north Norfolk coast). Monthly sampling from August 1992 to July 1993, on the lower salt marsh gives a mean annual density of 392 ind m−2 and a biomass of 10·26 g m−2 DW. Cohort analysis was made using ‘Bhatta’ software, allowing the growth and production estimations of the four cohorts. The production was 17·91 g m−2, giving a P:B ratio of 1·8. Nereis diversicolor population has only one recruitment in July.
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