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  1. jurek

    Time calibration and Linnean ranks in birds

    Like with other bird groups, almost all deeply split lineages are rain forest birds. I wonder if it is because rain forests are stable environment, so offer a sanctuary allowing the species to keep their ancient appearance. Or because significant open and cold habitats appeared on Earth...
  2. jurek

    Time calibration and Linnean ranks in birds

    By the way, the result that modern seabirds and most landbirds appeared well in the Tertiary is interesting. There is a long time gap between the extinction of the dinosaurs and appearance of modern groups of birds. What were the birds which filled all these habitats and ecological niches then...
  3. jurek

    Time calibration and Linnean ranks in birds

    Interesting exercise! But spare a thought that times of bird diversification are extremely poorly known. They depend on theoretical models how fast DNA differences should accumulate, which cannot be assumed to transfer between lineages and times and were proven wrong in many cases. Plus dating...
  4. jurek

    Time calibration and Linnean ranks in birds

    Large plovers is also possible. :)
  5. jurek

    Time calibration and Linnean ranks in birds

    I fully agree! The general rule is that during classification, obtaining many alternative results is an indication that the group is uniform and should not be subdivided. When every attempt of defining subgroups results in different ones, it is an indication that no real subgroups exist - the...
  6. jurek

    Time calibration and Linnean ranks in birds

    You lump together taxa very dissimilar biologically and ecologically, and split much more similar taxa into two or more very similar groups. Basically, you have shown that time-calibrated, monophyletic groups are an impractical method for classification of birds. It fits well the current...
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