Tag Archives: chironomids

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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Low calibration set counts in LT15

Larocque-Tobler et al (2015) promised that, for their chironomid calibration set   At least 50 head capsules (Heiri et al., 2001 and Larocque et al., 2001) were mounted. A cursory examination of the data shows that this is unlikely to … Continue reading

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The missing rare taxa at Żabińskie

“rarity is the attribute of a vast number of species of all classes, in all countries.” Charles Darwin In any census of any species-rich community, the rarest taxa are likely to be represented by a single individual. This can be … Continue reading

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