By John P. Smol, H.J. Birks, William M. Last
This 3rd quantity within the advancements in Paleoenvironmental examine sequence bargains with the main terrestrial, algal, and siliceous symptoms utilized in paleolimnology. different volumes take care of the purchase and
archiving of lake sediment cores, chronological recommendations, and large-scale basin research equipment (Volume 1), actual and geochemical parameters and techniques (Volume 2), zoological recommendations (Volume 4), and statistical
and knowledge dealing with equipment (Volume 5). those monographs will supply enough aspect and breadth to be important handbooks for either professional practitioners in addition as beginners to the realm of paleolimnology. even though the
chapters in those volumes objective customarily lacustrine settings, some of the options defined is usually with ease utilized to fluvial, glacial, marine, estuarine, and peatland environments.
Read or Download Tracking Environmental Change Using Lake Sediments - Volume 3: Terrestrial, Algal, and Siliceous Indicators (Developments in Paleoenvironmental Research) PDF
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Extra info for Tracking Environmental Change Using Lake Sediments - Volume 3: Terrestrial, Algal, and Siliceous Indicators (Developments in Paleoenvironmental Research)
Sample text
Since larger counts are more time consuming to carry out, there is clearly a trade-off between time spent and the level of uncertainty. Pollen percentages: Methods for calculating errors associated with pollen percentage calculations are described by Maher (1972), developing a method originally outlined by Mosimann (1965). The errors depend solely upon the size of the sum and the proportion within the sum of the taxon of interest and confidence intervals can be calculated. The degree of uncertainty decreases with the size of the count, and is about ±2% for a pollen type that represents about 50% of the sum in a count of 1000 grains (Maher, 1972; Traverse, 1988).
The frequency of each type is presented as a percentage of (main sum + group sum) or (main sum + individual sum). Pollen concentrations The amounts of exotic and fossil pollen counted can be used to determine the fossil pollen concentration as follows: The aim is to add about as much exotic pollen or spore as there is fossil pollen, to minimize counting effort and maximize precision of results (Maher, 1981). Clearly this requires prior knowledge, but with experience of particular sediments a reasonable estimate can be made.
Wiley, Chichester, 328 pp. Faegri, K. & L. van der Piji, 1979. ).