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  • 1
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    Interpreting the environmental record in the sediments of Blelham Tarn (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5166 | 3949 | 2011-09-29 15:18:23 | 5166 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-08
    Description: Two aspects of the environmental record in the sediments of Blelham Tarn have been investigated: (1) the ecological history of the catchment, and lake-catchment relationships, by detailed analysis of the preserved pollen (as an indication of vegetation) and sediment composition with respect to a range of inorganic and organic geochemical variables and (2) a detailed investigation of the manner in which sediment is being formed today, including the way in which microfossils (pollen and diatoms) are being recruited and incorporated into sediments. When the record was examined by biological and geochemical analysis, together with radionuclide dating, of closely spaced samples, it was found that the changes of the last 30 yrs represented only the most recent episode in a long history of modification of the lake by man. To find an approach to this it is necessary to go back for at least 2500 yrs.
    Keywords: Biology ; Ecology ; Limnology ; Environmental conditions ; Sediment analysis ; Sediment sampling ; Sediment-water interface ; Unconsolidated sediments ; England ; Lake District ; Annual report
    Repository Name: AquaDocs
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  • 2
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    Studies of chemical speciation in naturally anoxic basins (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5181 | 3949 | 2011-09-29 15:17:17 | 5181 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-09
    Description: The chemical speciation of both metals and non-metals, the use of polarographic techniques, and application to the study of the chemistry of anoxic waters are considered. In the first part of the paper unfamiliar terminology is explained and then an example of simple lake chemistry is presented to illustrate why the concept of speciation is necessary.
    Keywords: Chemistry ; Limnology ; Chemical speciation ; Anoxic basins ; Annual report
    Repository Name: AquaDocs
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    Format: application/pdf
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    Format: 53-59
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  • 3
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    Treading in Mortimer's footsteps: the geochemical cycling of iron and manganese in Esthwaite water (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5193 | 3949 | 2011-09-29 15:15:03 | 5193 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-09
    Description: A study of the geochemical cycling of iron and manganese in a seasonally stratified lake, Esthwaite water is described. This work is based on speculative ideas on environmental redox chemistry of iron which were proposed by C.H. Mortimer in the 1940's. These observations have been verified and some speculations confirmed, along with a new understanding of the manganese cycle, and detailed information on the particulate forms of both iron and manganese. Details on the mechanisms and transformations of iron have also emerged.
    Keywords: Biology ; Chemistry ; Chemical precipitation ; Freshwater lakes ; Iron ; Manganese ; Oxidation ; Redox potential ; Reduction ; Stratification ; England ; Esthwaite Lake ; Annual report
    Repository Name: AquaDocs
    Type: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 91-101
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  • 4
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    Long-term natural acidification of upland sites in Cumbria: Evidence from post-glacial lake sediments (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5197 | 3949 | 2011-09-29 15:15:33 | 5197 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-09
    Description: Studies by the Freshwater Biological Association over the last 25 years have supplied data relevant to the levels of acidity in local soils and water before the onset of industrial pollution and current interest in acid rain. This article reviews published analysis from cores of lake sediments, in or near the catchment of the River Duddon. Electron spin resonance spectra of humic acids and iodine values confirm evidence from pollen analysis for a history of progressive acidification of the source material of lake sediments since before 5000 radiocarbon years, in upland catchments of the Lake District. Processes involved included: removal of basic ions from soils by rainfall, the effects of which were intensified by removal by man of deciduous forest; acidification of soils and waters by decomposition products of Calluna and further acidification of waters by Sphagnum species which colonized habitats where drainage became impeded by paludification processes.
    Keywords: Biology ; Chemistry ; Earth Sciences ; Acid rain ; Acidification ; Freshwater lakes ; Lake Basins ; Lake deposits ; pH ; Palnology ; England ; Cumbria ; Annual report
    Repository Name: AquaDocs
    Type: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 28-46
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