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EFFECTS OF EUTROPHICATION: SPATIAL LIMITATION OF PHOTOSYNTHETIC ACTIVE RADIATION IN LAKES WITH DEEP-WATER ANOXIA

Tomasz Joniak

First published: 2018-06-20https://doi.org/10.5593/sgem2018/3.1/s12.030View metrics

Abstract

The subject of study was spatial analysis of transmission of visible light in water column of two deep suburban lakes during peak of summer. In vertical profiles of lakes correlations between transmission of blue/green light, photosynthetic active radiation (or PAR), temperature and oxygen content, chlorophyll a and physico-chemical features of water were analysed. Apparent and true depth of photic zone was investigated. The hypothesis was that vertical changeability of PAR limitation/transmission may be used as a tool to localize cumulative layers of organisms (e.g. patchiness of phytoplankton) or abiotic components. The variability of light transmission in a mesotrophic lake revealed peak of phytoplankton biomass in epilimnion as well as the deep layer of iron accumulation in the anoxic zone. In the eutrophic lake with the algae bloom in the shallow epilimnion it was possible to localize a layer of optimal conditions for phytoplankton development. A larger transmission, similar or higher than in subsurface layer, was noted below the trophogenic zone. In both lakes the sub-bottom layer was characterized by a very low transmission of light due a high turbidity level related with high content of gaseous hydrogen sulfide.

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Title
EFFECTS OF EUTROPHICATION: SPATIAL LIMITATION OF PHOTOSYNTHETIC ACTIVE RADIATION IN LAKES WITH DEEP-WATER ANOXIA
Authors
Tomasz Joniak
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Water Resources. Forest, Marine and Ocean Ecosystems
Publisher
STEF92 Technology
Year
2018
Pages
227-234
SWS Citekey
Joniak201812227234
ISSN
1314-2704
ISBN
978-619-7408-42-3
Language
en
Publication type
Conference Paper
Keywords
eutrophicationphotosynthetic active radiationlight transmissionanoxiaturbidity
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