Abstract
The records for 14 years of plant micro-nutrient concentrations and the quantities of chlorophyll in Liverpool Bay are reviewed. The complicated and varied hydrographical regimes which characterize the area preclude the use of the former variables as precise indicators of the extent of enrichment of the water. There is nonetheless evidence that the area can sometimes support high standing crops of phytoplankton. Advective dispersal processes and variations in their intensity are probably particularly important in controlling the magnitude of these crops of phytoplankton. It is suggested that adequate long term records of the frequency and duration of such blooms are likely to be a more useful indication of the extent of eutrophication of the area and of any long term trends which might occur than are the hydrochemical data.
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