, Volume 35, Issue 3–4, pp 545–553 | Cite as

Changes in the fauna and flora of a nutrient enriched lake

  • N. C. Morgan


Changes in the flora and fauna at Loch Leven are described. Species associated with oligotrophic conditions such as charr and desmids have declined or disappeared, and prolonged, dense algal blooms, particularly Cyanophyceae, have been a feature of recent years. Much of the macrophytic vegetation has disappeared and there have been changes in the composition of the zooplankton and benthos, several abundant species disappearing (Table II). Possible reasons for these changes are given.


Die Veränderungen in der Pflanzen-und Tierwelt von Loch Leven werden beschrieben. Gattungen welche gewöhnlich in oligotrophen Gewässern gefunden werden, wie Salvelinus und Desmidiaceae, sind verringert oder ganz verschwunden. In den letzten Jahren sind Cyanophyceae immer haüfiger hervorgetreten. Viele höhere Pflanzen sind verschwunden und es hat sich vieles geändert in der Komposition des Zooplanktons und Benthos. Mehrere wichtige Gattungen dieser Gruppen verschwinden allmählich. Mögliche Gründe für diese Veränderungen werden gegeben.


Phytoplankton Macrophyte Synechococcus Brown Trout Submerged Macrophyte 
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© Dr. W. Junk n.v. Publishers 1970

Authors and Affiliations

  • N. C. Morgan
    • 1
  1. 1.Nature ConservancyEdinburghUK

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