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Getting geometric

This study explores the geometric shape profiles of various ruminants, focusing on moose, silver dik-dik, Cape grysbok, and Guenther’s dik-dik. By applying Procrustes transformations to 121 snout profiles, we provide insights into feeding strategies among grazers, browsers, and intermediates. The analysis reveals that snout shape serves as a reliable proxy for understanding palaeoecology in extinct species and suggests that grazers may represent a more specialized group than previously thought. Our findings could enhance interpretations of ecological adaptations in ruminants and related groups.

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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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