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Title: The Distribution Of Phytoplankton And Nutrients In The North East Irish Sea During 1997;
Author: Kennington K
Author: Environment Agency
Document Type: Monograph
Annotation: Environment Agency Project ID:EAPRJOUT_641, Representation ID: 211, Object ID: 1973
And Nutrient Distributions In The North-East Sea During 1997. Irish The results presented summarise the findings of collaborative research between the Environment Agency (North-West Region) and Port Erin Marine Laboratory (University of Liverpool). The objectives of this research have been to monitor the spatial and temporal distributions of nutrient salt concentrations and phytoplankton abundances in the north-eastern Irish Sea. Specific objectives have been to identify areas within these w-aters that are potentially at risk from the adverse effects of nutrient discharges from sewage, industrial and riverine sources within the region. This is the third year of collaboration between the two organisations and prewious findings are to be found in Allen et nl. (1996) and Kennington et al. (1997). Industrial discharges into the region are readily apparent-from the data presented and support the findings of previous years. Two point sources of inorganic nutrients in particular are located at Albright and Wilson, Whitehaven and at BNFL Sellafield, where elevated concentrations of phosphorus and nitrogerious compounds are found respectively. Waters along the Cumbrian coast exceeded the guidelines of the Comprehensive Studies Task Team (CSTT) with regard to winter levels of DAIN and DAIP during 1997. The summer concentrations of surface chlorophyll along the Cumbrian Coast during 1997 w-ere generally low-er than those reported for 1996 and did not exceed the lOpg/ threshold outlined by the CSTT. Industrial discharges from Albright and Wilson are expected to decrease over. the next few years, however discharges of nitrogenous and phosphorus compounds from BNFL Sellafield are likely to increase in the next few years owing to increased throughput and new operations. The results presented show winter concentrations of nitrogenous compounds in particular to have increased across the region when compared to the findings of previous years [Jones and Folkard 1971, Allen et al. 1996, Kennington et al. 19971. This has subsequently raised the N:Si ratio across the entire region which now exceeds the guidelines of the CSTT and this level is suggested under these guidelines to be prone to andture eutrophication. Such an alteration, it is argued, may present itself by altering the phytoplankton community structure favouring non-siliceous organisms and possibly increasing the occurrences of nuisance algae. Discharges of nutrient salts into Liverpool Bay stem mainly from the rivers Mersey, Ribble and Dee and also from sewage sludge disposal. Nutrient concentrations were highest towards the south-east of the study area on all sampling dates. The waters in this region failed the recommendations of the CSTT with regard to winter levels of DAIN and DAIP and to summer concentrations of surface chlorophyll. These findings reinforce those presented for 1996 and support the recommendation that the Wirral HNDA should not be classified as less sensitive. Winter levels of N:Si (along the coast from the IMersey westwards) exceed the recommendations of the CSTT, suggesting that these w-ateis may be prone to titure eutrophication.
Publisher: Environment Agency
Subject Keywords: Nitrate; Phytoplankton; Phosphate; Nutrients; Irish sea; Silicate; Phneocystis; Stratigraphy
Geographic Keywords: Cumbria; Liverpool Bay
Extent: 113
Total file downloads: 8

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