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Applications of Commonly Used Numerical Techniques in Diatom-Based Paleoecology

Published online by Cambridge University Press:  21 July 2017

Brian F. Cumming  and
Katrina A. Moser
Brian F. Cumming
Affiliation:
Paleoecological Environmental Assessment and Research Laboratory (P.E.A.R.L.) Department of Biology, Queen's University, Kingston, Ontario K7L 3N6 Canada
Katrina A. Moser
Affiliation:
Department of Geography, The University of Western Ontario, 1151 Richmond Street North, London, Ontario N6A 5C2 Canada
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Abstract

Applications of commonly used numerical techniques in diatom-based paleoecology are reviewed including: approaches used to model diatom taxa to important limnological variables; ordination and other commonly used multivariate approaches; and the myriad of approaches that are now being explored to infer environmental variables based on diatom assemblages.

Modelling the response of individual diatom taxa to limnologically important variables is consistent with ecological theory and has been largely accomplished using approaches based on generalized linear models. These techniques have established that strong and significant relationships exist between the numerically dominant diatom taxa and important limnological variables (e.g., pH, nutrients, salinity). Null modelling approaches have also been used. However, inclusion of rare taxa in null models results in high rates of type-II errors, and consequently spurious claims that only a minority of diatoms have significant relationships to important limnological variables such as lakewater pH and nutrients.

A variety of ordination techniques are widely used in diatom-based paleolimnological studies to aid in summarizing the main directions of variation in diatom assemblages, and to identify limnological variables that are strongly correlated to the diatom assemblages, both in time and space. More advanced ordination techniques, such as partial ordinations, are increasingly being used to assess the shared and unique variance attributable to groups of important limnological variables. Further, diatom-based approaches based on experimental designs with control lakes and appropriate multivariate statistics are now becoming increasingly common to assess, for example, the impact of forestry on water quality.

A number of different diatom-based inference models based on the present-day relationships between diatom assemblages and limnological variables are now available for inferring important limnological variables. These approaches vary from simple approaches such as weighted-averaging to more complex approaches involving curve fitting and maximum likelihood, neural networks, and Bayesian statistics. All of these approaches have been shown to result in strong inference models, each using aspects of ecological information available from the diatom assemblages.

Type
Research Article
Information
The Paleontological Society Papers , Volume 13: Pond Scum to Carbon Sink: Geological and Environmental Applications of the Diatoms , October 2007 , pp. 13 - 31
Copyright
Copyright © by the Paleontological Society 

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