Category Archives: transfer function

Chironomid vs pollen: Holocene climate change in southern Europe

Pollen-inferred summer temperature reconstructions from southern Europe show cool early-Holocene summers and warmer late-Holocene summers (Davis et al 2003, Mauri et al 2015). In contrast,  warm early-Holocene summers are reconstructed elsewhere in Europe and most of the mid-high latitude Northern … Continue reading

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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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why would anyone not trust the author????

I have already shown that ordinations of the Lake Żabińskie fossil assemblages are weirder than you ever imagined possible. Now it is time to look at figure 2 of Larocque-Tobler et al (2015) which shows an ordination of the chironomid … Continue reading

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73 lakes become 78

I have detailed many curious aspects of the remarkable Lake Żabińskie August air-temperature reconstruction by Larocque-Tobler et al (2015). This posts describes yet more – this time in Supplementary Data Figure 1 which shows a redundancy analysis (a type of … Continue reading

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The Humpty Dumpty theory of palaeoecology

“When I use a proxy,” Humpty Dumpty said, in rather a scornful tone, “it means just what I choose it to mean – neither more nor less.” “The question is,” said Alice, “whether you can make a proxy mean so … Continue reading

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Replicating the Lake Żabińskie reconstruction

Having shown that the archived chironomid data from Lake Żabińskie are strange in several ways and have bad reconstruction diagnostics, I want to see how well I can replicate the August air-temperature reconstuction. First, I need to build the transfer … Continue reading

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Reconstruction diagnostics for the Lake Żabińskie chironomid reconstruction

The evaluation of reconstruction diagonstics is an essential part of the process of generating palaeoenvironmental reconstructions from microfossil assemblages using transfer functions. If the reconstruction diagnostics are bad, we should be especially cautious about interpreting the reconstruction. The problems is … Continue reading

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