The underwater light-field of lakes with marked physico-chemical and biotic diversity in the water column

Errors in calculation of radiant fluxes of downwelling underwater photosynthetically available radiation (PAR) from force-fitting statistical values of K¯ d to vertical broad-band PAR profiles are compounded by vertical heterogeneity in such factors as turbidity, gilvin (= gelbstoff) and chlorophyll...

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Bibliographic Details
Published in:Journal of plankton research 1986, Vol.8 (1), p.69-77
Main Authors: Bowling, L.C., Tyler, P.A.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Fresh water ecosystems
Fundamental and applied biological sciences. Psychology
Synecology
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Summary:Errors in calculation of radiant fluxes of downwelling underwater photosynthetically available radiation (PAR) from force-fitting statistical values of K¯ d to vertical broad-band PAR profiles are compounded by vertical heterogeneity in such factors as turbidity, gilvin (= gelbstoff) and chlorophyll. Examples are given from two Tasmanian meromictic lakes where vertical zonation of gilvin and microorganisms in the mixolimnia and across the chemoclines produces a markedly heterogeneous water column. Localised concentrations of gilvin produce kinked profiles of downwelling PAR (400–700 nm) and microbial plates in the vicinity of the chemoclines act as false, reflective bottoms, abruptly extinguishing residual PAR by absorption and scattering.
ISSN:0142-7873
1464-3774
DOI:10.1093/plankt/8.1.69