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The influence of humic substances on lacustrine planktonic food chains

  • Chapter
Dissolved Organic Matter in Lacustrine Ecosystems

Part of the book series: Developments in Hydrobiology ((DIHY,volume 73))

Abstract

Humic substances (HS) might influence planktonic food chains in lakes in two ways: 1) by altering the physical or chemical environment and thus modifying autotrophic primary production and the dependent food chains; 2) by acting as a direct carbon/energy source for food chains.

HS compete with phytoplankton for available quanta underwater and this effect is seen in the reduced euphotic zone depth in lakes with high concentrations of HS. Thus potential photo synthetic production is lower in the presence of HS. However, this effect can be offset in small lakes in which the depth of mixing is also reduced when HS concentrations are high. Complexation by HS of important nutrients such as iron and phosphorus may also restrict primary production.

Evidence is accumulating that photo synthetic primary production is insufficient to support measured metabolic activity in humic lakes, which implies that metabolism of allochthonous HS underpins much of the observed activity. Studies of bacterial abundance and growth in the presence of HS support the view that bacteria are the most significant utilisers of HS. This use is apparently facilitated by photolysis of HS, particularly by short wavelength radiation. Bacteria are grazed by both micro-zooplankton (heterotrophic and mixotrophic flagellates and ciliates) and macrozooplankton. It is within this microbial community that the food chains derived from autotrophic and allotrophic sources interact. These effects of HS on food chains are discussed in relation to possible implications for the response of different lake types to eutrophication.

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  1. Division of Biological Sciences, Institute of Environmental and Biological Sciences, University of Lancaster, Lancaster, LA1 4YQ, UK

    Roger I. Jones

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K. Salonen T. Kairesalo R. I. Jones

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Jones, R.I. (1992). The influence of humic substances on lacustrine planktonic food chains. In: Salonen, K., Kairesalo, T., Jones, R.I. (eds) Dissolved Organic Matter in Lacustrine Ecosystems. Developments in Hydrobiology, vol 73. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2474-4_6

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  • DOI: https://doi.org/10.1007/978-94-011-2474-4_6

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-5092-0

  • Online ISBN: 978-94-011-2474-4

  • eBook Packages: Springer Book Archive

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