Journal ArticleDOI
Acidification of lakes in Galloway, south west Scotland: a diatom and pollen study of the post-glacial history of the Round Loch of Glenhead.
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TLDR
Potential acidification by chemical weathering, soil leaching and organic matter accumulation in the catchment of the Round Loch of Glenhead is evaluated using diatom and pollen analysis of a radiocarbon dated sediment core.Abstract:
SUMMARY (1) Potential acidification by chemical weathering, soil leaching and organic matter accumulation in the catchment of the Round Loch of Glenhead is evaluated using diatom and pollen analysis of a radiocarbon dated sediment core. The Round Loch is situated on granite bedrock and is likely to have been sensitive to acidification throughout the postglacial period. (2) About 9000 years B.P. the open habitats of the late and early post-glacial were replaced by birch/hazel woodland, then oak/elm/pine woodland, and oak/hazel/alder woodland by about 5400 years B.P. After 5700 years B.P., blanket mires increasingly replaced woodland. The present vegetation on the blanket peat is a Molinia/Calluna heathland. (3) The lake was acid in the late-glacial period (pH 5 3-5 7). No evidence of long-term acidification in the early post-glacial period was found, and from 9000-4150 years B.P. the pH of the loch was probably between 5 3 and 5 6. In the mid post-glacial no indication of lake acidification that might be associated with peat development in the catchment was identified, and from 4100 years B.P. there is evidence that a slight increase in pH or nutrient availability or both occurred. (4) Despite a clear change from mineral to acid organic soils in the catchment in the mid post-glacial, feedback mechanisms operated to maintain a lake with pH stable at 5 and above for most of the post-glacial period. With the introduction of strong acid anions associated with acid deposition after A.D. 1800 the pH fell to its present value of 4 7.read more
Citations
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Journal ArticleDOI
Flexible paleoclimate age-depth models using an autoregressive gamma process
TL;DR: Christen et al. as discussed by the authors used a gamma-to-regressive semiparametric model with an arbitrary number of subdivisions along the sediment to estimate the age of sediment cores.
Journal ArticleDOI
Diatoms and pH Reconstruction
TL;DR: Reconstruction of past lake-water pH from diatom data involves two steps; regression, where responses of modern diatom abundances to pH are modelled and calibration, where the modelled responses are used to infer pH fromdiatom assemblages preserved in lake sediments.
Book
Pollution of Lakes and Rivers: A Paleoenvironmental Perspective
TL;DR: The second edition of the Rosetta Stone has been published by as discussed by the authors, which is used to calibrate indicators to environmental variables using surface-sediment training sets, such as ozone depletion, acid rain, and climatic warming.
Journal ArticleDOI
Analogue Methods in Palaeoecology: Using the analogue Package
TL;DR: These methods and other functionality in analogue are illustrated using the Surface Waters Acidification Project diatom:pH training set and diatom counts on samples of a sediment core from the Round Loch of Glenhead, Galloway, Scotland.
Journal ArticleDOI
Miniview: Diatoms, temperature and climatic change
TL;DR: It is suggested that the link between changing climate and diatoms be addressed via an alternative method than that of temperature-inference models, because the situation demands a more complete understanding of the interactions between lake hydrodynamics and nutrient inputs from catchments over a variety of timescales.
References
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Book
An Illustrated Guide to Pollen Analysis
Peter D. Moore,J. A. Webb +1 more
TL;DR: An illustrated guide to pollen analysis, An illustratedguide to pollenAnalysis, and more.
Journal ArticleDOI
The use of electronically counted microspheres in absolute diatom analysis
Richard W. Battarbee,M. J. Kneen +1 more
Journal Article
The pH history of lakes in southwestern Sweden, as calculated from the subfossil diatom flora of the sediments
I Renberg,T Hellberg +1 more
TL;DR: In this article, a method for calculating the past pH values of lake water using the diatom assemblages present in sediment samples has been improved and applied in a study of the pH history of three lakes in southwestern Sweden.
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