Palaeolimnology in the English Lakes — some questions and answers over fifty years
Identifieur interne : 001694 ( Main/Curation ); précédent : 001693; suivant : 001695Palaeolimnology in the English Lakes — some questions and answers over fifty years
Auteurs : Winifred Pennington [Royaume-Uni]Source :
- Hydrobiologia [ 0018-8158 ] ; 1991-05-01.
Abstract
Abstract: In a review of work on 10 of the very numerous lakes of the English Lake District — work which involved co-operation between palaeolimnologists from different disciplines and between palaeo- and neolimnologists — the questions asked by the researchers are listed and it is shown which kind of lake has provided constructive answers. Complete and conformable sediment profiles covering the last ca 14 000 years are found in these lakes, but no single profile is optimal for study of the whole period. Knowledge of the pattern of sediment accumulation is necessary before the record in microfossils and changing sediment composition can be interpreted with confidence. The demonstration that the sediment-source material of these open lakes must have been largely allochthonous established the importance of the sediment column as a record of changes through time in the composition and stability of the soils of each catchment. These changes illustrate the influence of: i. Climatic changes, from glacial to temperate interstadial followed by renewed glaciation (Younger Dryas) and then by a long temperate (postglacial) state, during which changes in stream run-off and in the pattern of deposition in lakes indicate changes in precipitation and wind-induced turbulence. ii. Processes of pedogenesis, determining the composition of sediment-source material. iii. Changes in aquatic and terrestrial biota in response to climatic changes interacting with biological processes; the major changes which coincide with changing land use by man over 5000 years, and the more recent changes associated with the dates for human discharges into lakes and the deposition of airborne pollutants.
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DOI: 10.1007/BF00050927
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