The planktonic and benthic bacterial populations of Lough Neagh |
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Authors: | JP QUINN MB GILLAN H MCGROGAN |
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Institution: | New University of Ulster, Limnology Research Laboratory, Traad Point, Drumenagh, Magherafelt, Co. Derry, N. Ireland |
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Abstract: | The planktonic and benthic bacterial populations of Lough Neagh, Northern Ireland, were studied over a one-year period. Direct counts of bacteria in the water column averaged 6 times 107/ml with limited spatial or temporal variation; viable counts, however, showed a pronounced late spring maximum of 1.7 times 106/ml and were consistently higher at a littoral sampling station. Direct counts of bacteria in the profundal sediments averaged 8 times 109/ml whilst viable benthic counts rose steeply during spring to reach a June maximum of 1 times 108/ml. Direct: viable count ratios were much greater in the more sandy littoral zone. The predominant benthic isolate was an Aeromonas sp. which was also common in samples from the water column. These results confirm the eutrophic status of Lough Neagh indicated by other biological and chemical surveys. |
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