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Light penetration in relation to phytoplankton content of the euphotic zone of Lough Neagh, N. Ireland

A strong spectral variation in underwater light penetration is found in Lough Neagh, particularly in the wavelengths available for photosynthesis (400-700 nm). Using a spectroradiometer and coloured filters to analyse the underwater light climate, the depth of the euphotic zone was found to vary between 1 and 3 m and was largely attributable to changes in algal density between 26 and 92 mg chlorophyll a m-3 in the open lake and between 48 and 300 mg chl a m-3 in a shallow almost enclosed area, Kinnego Bay. Although self-shading of the algal cells is important at high crops the contribution from non-algal sources becomes increasingly significant at low crop concentrations. The factors controlling the algal content of the euphotic zone for the open lake (70-174 mg chl a M-2) and Kinnego Bay (114-380 mg chl a M-2) are discussed and compared with other well-mixed eutrophic lakes.