LIGHT PENETRATION IN RELATION TO PHYTOPLANKTON CONTENT OF EUPHOTIC ZONE OF LOUGH-NEAGH, N IRELAND

被引:53
作者
JEWSON, DH [1 ]
机构
[1] NEW UNIV ULSTER, SCH BIOL & ENVIRONM STUDIES, COLERAINE, NORTH IRELAND
关键词
D O I
10.2307/3543325
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
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 colored filters to analyze the underwater light climate, the depth of the euphotic zone varied between 1-3 m and was largely attributable to changes in algal density between 26-92 mg chlorophyll [chl] a m-3 in the open lake and between 48-300 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.
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页码:74 / 83
页数:10
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