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Experimental manipulations of the phytoplankton periodicity in large limnetic enclosures in Blelham Tarn, English Lake District

  • C. S. Reynolds
Part of the Developments in Hydrobiology book series (DIHY, volume 33)

Abstract

This paper reviews the results of experimental manipulations, carried out during the period 1977–1983, on the phytoplankton maintained in the limnetic enclosures at Blelham Tarn, English Lake District. Three categories of manipulations are considered.

The effects of variation in the scale and frequency of phosphorus loading (range: 0.3 to 2.5 g P m-2 a-1) upon the mean phytoplankton biomass, its seasonal distribution and specific dominance are shown to conform to well-established patterns and relationships observed in natural lakes. Much of the seasonal variability in species dominance occurred independently of nutrient ratios, though carbon availability has been critical at times. Attempts to manipulate the rates of removal of phytoplankton by grazing have confirmed that they act selectively against certain smaller species only, that they alter the rate of successional change, rather than its direction, and that they have little lasting influence upon the total phytoplankton standing crop. Attempts to manipulate rates of sinking loss through artificial enlargement of the epilimnetic circulation also regulated the light-conditions experienced by suspended phytoplankton.

Growth-rate relationships to an index of light exposure and to temperature fluctuation are also derived for several species and are related to morphological and physiological characters of the organisms concerned. These interpretations are briefly reviewed in relation to periodic cycles in natural lakes.

Keywords

seasonality phytoplankton enclosures manipulation growth-rate regulation 

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Copyright information

© Dr W. Junk Publishers, Dordrecht 1986

Authors and Affiliations

  • C. S. Reynolds
    • 1
  1. 1.Freshwater Biological AssociationCumbriaUK

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