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Morphological disparity in theropod jaws: comparing discrete characters and geometric morphometrics

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@article{cd19be5a92e04e559d13b8d7369c3cc2,
title = "Morphological disparity in theropod jaws: comparing discrete characters and geometric morphometrics",
abstract = "Disparity, the diversity of form and function of organisms, can be assessed from cladistic or phenetic characters, and from discrete characters or continuous characters such as landmarks, outlines, or ratios. But do these different methods of assessing disparity provide comparable results? Here we provide evidence that all metrics correlate significantly with each other and capture similar patterns of morphological variation. We compare three methods of capturing morphological disparity (discrete characters, geometric morphometric outlines and geometric morphometric landmarks) in coelurosaurian dinosaurs. We standardise our study by focusing all our metrics on the mandible, so avoiding the risk of confounding disparity methods with anatomical coverage of the taxa. The correlation is strongest between the two geometric morphometric methods, and weaker between the morphometric methods and the discrete characters. By using phylogenetic simulations of discrete character and geometric morphometric data sets, we show that the strength of these correlations is significantly greater than expected from the evolution of random data under Brownian motion. All disparity metrics confirm that Maniraptoriformes had the highest disparity of all coelurosaurians, and omnivores and herbivores had higher disparity than carnivores.",
keywords = "dinosaur, coelurosaur, maniraptoriform, disparity, morphometrics",
author = "Joep Schaeffer and Benton, {Michael J} and Rayfield, {Emily J} and Stubbs, {Thomas L}",
year = "2019",
month = "11",
day = "3",
doi = "10.1111/pala.12455",
language = "English",
journal = "Palaeontology",
issn = "0031-0239",
publisher = "Wiley",

}

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TY - JOUR

T1 - Morphological disparity in theropod jaws

T2 - comparing discrete characters and geometric morphometrics

AU - Schaeffer, Joep

AU - Benton, Michael J

AU - Rayfield, Emily J

AU - Stubbs, Thomas L

PY - 2019/11/3

Y1 - 2019/11/3

N2 - Disparity, the diversity of form and function of organisms, can be assessed from cladistic or phenetic characters, and from discrete characters or continuous characters such as landmarks, outlines, or ratios. But do these different methods of assessing disparity provide comparable results? Here we provide evidence that all metrics correlate significantly with each other and capture similar patterns of morphological variation. We compare three methods of capturing morphological disparity (discrete characters, geometric morphometric outlines and geometric morphometric landmarks) in coelurosaurian dinosaurs. We standardise our study by focusing all our metrics on the mandible, so avoiding the risk of confounding disparity methods with anatomical coverage of the taxa. The correlation is strongest between the two geometric morphometric methods, and weaker between the morphometric methods and the discrete characters. By using phylogenetic simulations of discrete character and geometric morphometric data sets, we show that the strength of these correlations is significantly greater than expected from the evolution of random data under Brownian motion. All disparity metrics confirm that Maniraptoriformes had the highest disparity of all coelurosaurians, and omnivores and herbivores had higher disparity than carnivores.

AB - Disparity, the diversity of form and function of organisms, can be assessed from cladistic or phenetic characters, and from discrete characters or continuous characters such as landmarks, outlines, or ratios. But do these different methods of assessing disparity provide comparable results? Here we provide evidence that all metrics correlate significantly with each other and capture similar patterns of morphological variation. We compare three methods of capturing morphological disparity (discrete characters, geometric morphometric outlines and geometric morphometric landmarks) in coelurosaurian dinosaurs. We standardise our study by focusing all our metrics on the mandible, so avoiding the risk of confounding disparity methods with anatomical coverage of the taxa. The correlation is strongest between the two geometric morphometric methods, and weaker between the morphometric methods and the discrete characters. By using phylogenetic simulations of discrete character and geometric morphometric data sets, we show that the strength of these correlations is significantly greater than expected from the evolution of random data under Brownian motion. All disparity metrics confirm that Maniraptoriformes had the highest disparity of all coelurosaurians, and omnivores and herbivores had higher disparity than carnivores.

KW - dinosaur

KW - coelurosaur

KW - maniraptoriform

KW - disparity

KW - morphometrics

U2 - 10.1111/pala.12455

DO - 10.1111/pala.12455

M3 - Article

JO - Palaeontology

JF - Palaeontology

SN - 0031-0239

ER -