Lake development and limnological response to prehistoric and historic land-use in Diss, Norfolk, UK

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Abstract

The lake was mildly nutrient-rich (mesotrophic) early in its history. The lower part of the core shows large variations in diatom concentrations and distinct lithological changes, including broad bands of silt and short sections of laminated sediments, which suggest fluctuating lake levels in the early Holocene. Increased concentrations of the blue-green algal pigment oxcillaxanthin indicate the expansion of Oscillatoria about 6000 years BP, probably in response to increased stabilization of the water column. The subsequent preservation of >3 m of laminated sediments in the mid-Holocene and extremely high pigment concentrations indicate a long period of moderate water levels and seasonal hypolimnetic oxygen depletion. Increased pigment concentrations and percentages of diatom taxa characteristic of moderately enriched lakes correlate with pollen evidence of widespread deforestation. Rapid and sustained eutrophication of the mere probably resulted from increased nutrient inputs caused by forest clearance. The mere remained eutrophic throughout the remainder of its history. Subsequent shifts in the diatom community indicate limnological responses to agricultural practices associated with Cannabis cultivation and later to the growth of a town around the mere. -from Author

Original languageEnglish (US)
Pages (from-to)182-202
Number of pages21
JournalJournal of Ecology
Volume77
Issue number1
DOIs
StatePublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science

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