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Getting geometric

Getting geometric. ???. Alces pulmatus (Moose). Madoqua swaynei (Silver dik-dik ). Raphicerus melanotis (Cape Grysbok). Rhyncotragus guentheri (Guenther’s dik-dik ). Highly informative. Shipley, 1999. Mean geometric shape profile of the 121 Procrustes -transformed snout profiles.

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Getting geometric

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  1. Getting geometric ??? Alcespulmatus (Moose) Madoquaswaynei (Silver dik-dik) Raphicerus melanotis (Cape Grysbok) Rhyncotragus guentheri (Guenther’s dik-dik) Jon Tennant, Imperial College London; Norm MacLeod, Natural History Museum, London

  2. Highly informative Shipley, 1999

  3. Mean geometric shape profile of the 121 Procrustes-transformedsnout profiles.

  4. P=0.0 Grazers: 84% Intermediates: 47.9% Browsers: 48.9% Frugivores: 100% 57.02% “success rate”

  5. Note: These are the axes viewed in 2D space, when really they’re in 200D space

  6. Point along axis Overlay 1 2 3 4 5 1 2 3 Geometric simplicity of snout profiles has previously been a factor of limited sampling Axis Transition from pointed to blunt?

  7. 71.9% correct assignment – not bad, but not great P=2.132E-07

  8. 42.14% correct assignment = not brilliant P=4.054E-10

  9. 78.57% success rate (57.02% before) Only well-defined browsers and grazers can be successfully delimited with a 78.57% success rate This system breaks down when putative intermediates are incorporated

  10. Shape-based feeding classes have been converged upon by ruminants independent of their body mass Grazers may be a much more specialised or conservative feeding group than previously suggested, compared to browsers

  11. Er, Jon, this is Progressive PALAEONTOLOGY • Snout shape could be a statistically rigorous proxy for determining palaeoecology in extinct ruminants, and possibly other analogous groups.. Hypsilophodon foxii Zalmoxesrobustus Dryosauruslettowvorbecki Telmatosaurus transsylvanicus

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