Tag Archives: Transfer function diagnostics

Performance of chironomid-temperature transfer functions

Chrironomid (non-biting midges) are sensitive to temperature (Eggermont and Heiri 2011), and because their head-capsules preserve well in lake sediments, their fossil assemblages can be use to reconstruct past temperature with a transfer function trained on the chironomid-temperature relationship in … Continue reading

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Uneven sampling of the gradient and segment-wise RMSEP

The root mean square error of prediction (RMSEP) is a measure of the performance of a transfer function for reconstructing past environmental conditions from fossil microfossil assemblages based on the modern relationship between species and the environment in a calibration … Continue reading

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N2 and the variability of optima

In my previous post on checking how well represented the fossil taxa are in the modern calibration set, I mentioned that taxa with fewer than five effective occurrences, calculated with Hill’s N2, are likely to have poorly constrained optima. I … Continue reading

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Transfer functions and species coverage

A transfer function will generate numerical reconstructions provided that at least one taxon is present in both the fossil and modern data sets. Obviously, the reconstruction will be more reliable if most of the fossil taxa are in the modern … Continue reading

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Transfer function and palaeoenvironmenal reconstruction diagnostics

Past environmental conditions can be reconstructed from fossil species assemblages with transfer functions. It is a simple matter to create a transfer function from modern species assemblages and associated environmental data and then use this to generate a reconstruction for … Continue reading

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