Variation of fluorescence, particle-size groups, and environmental parameters in the southern North Sea

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Abstract
Three surveys were carried out in April 1977 in the Southern Bight of the North Sea to investigate variance in plankton, environmental properties, and their interrelationships. Fluorescence, particle-size groups, and environmental variables were monitored over 100 km transects. Fourier techniques were used in the analyses. Large amplitude small-scale variability was absent in fluorescence but patches of 25 km length were observed in the 30 to 80 μm particle-size range. Fluorescence data indicated a spatial structure similar to that predicted by Denman and Platt (1976) and Fourier spectra of fluorescence, environmental parameters, and particle-size groups were different from each other. The spectra of the particle-size groups were flat or else had a small slope. Coherences were generally high amongst all variables but coherences between specific biological and environmental variables occurred at different space scales suggesting that the biological system may be forced at different space scales by different environmental components. Some substantial decreases in pH were noted.

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