[dinosaur] Fwd: Dinosaur quadrupedal and bipedal posture shifts during ontogeny

This earlier post may not have gone through for some reason. I don't see it
posted yet on my DML email. Apologies if some people already received it.

---------- Forwarded message ---------
From: Ben Creisler <[email protected]>
Date: Wed, Nov 6, 2019 at 12:52 PM
Subject: Dinosaur quadrupedal and bipedal posture shifts during ontogeny
To: <[email protected]>



Ben Creisler
[email protected]

A new paper:


Kimberley E. J. Chapelle,  Roger B. J. Benson,  Josef Stiegler,  Alejandro
Otero,  Qi Zhao  & Jonah N. Choiniere (2019)
A quantitative method for inferring locomotory shifts in amniotes during
ontogeny, its application to dinosaurs and its bearing on the evolution of
posture.
Palaeontology (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1111_pala.12451&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=iHJX9grnYd0TPPiPhUgjBbYhYUPAQoUnm0SvuwHp8y4&s=dqrhGInfymLRrlN8hL6cTe_43r32j5RZGEhx9ihStUo&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__onlinelibrary.wiley.com_doi_10.1111_pala.12451&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=iHJX9grnYd0TPPiPhUgjBbYhYUPAQoUnm0SvuwHp8y4&s=fsA_leWiIUtd7wD7KSJqtZH4dmr18bTHIMrvv4PA8LY&e= 

Data for this study are available in the Dryad Digital Repository:
https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.5061_dryad.j4869rd&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=iHJX9grnYd0TPPiPhUgjBbYhYUPAQoUnm0SvuwHp8y4&s=xrMi8P_30-6jRqiUeBmRuWNblKMDukXYlx7Gfq7eJIc&e= 



Evolutionary transitions between quadrupedal and bipedal postures are
pivotal to the diversification of amniotes on land, including in our own
lineage (Hominini). Heterochrony is suggested as a macroevolutionary
mechanism for postural transitions but understanding postural evolution in
deep time is hindered by a lack of methods for inferring posture in extinct
species. Dinosaurs are an excellent natural laboratory for understanding
postural transitions because they demonstrate at least four instances of
quadrupedality evolving from bipedality, and heterochronic processes have
been put forward as an explanatory model for these transitions. We extend a
quantitative method for reliably inferring posture in tetrapods to the
study of ontogenetic postural transitions using measurements of
proportional limb robusticity. We apply this to ontogenetic series of
living and extinct amniotes, focusing on dinosaurs. Our method correctly
predicts the general pattern of ontogenetic conservation of quadrupedal and
bipedal postures in many living amniote species and infers the same pattern
in some dinosaurs. Furthermore, it correctly predicts the ontogenetic
postural shift from quadrupedal crawling to bipedal walking in humans. We
also infer a transition from early ontogenetic quadrupedality to
late‐ontogenetic bipedality in the transitional sauropodomorph dinosaur
Mussaurus patagonicus and possibly in the early branching ceratopsian
Psittacosaurus lujiatunensis but not in the sauropodomorph Massospondylus
carinatus. The phylogenetic positions of these ontogenetic shifts suggest
that heterochrony may play a role in the macroevolution of posture, at
least in dinosaurs. Our method has substantial potential for testing
evolutionary transitions between locomotor modes, especially in elucidating
the role of evolutionary mechanisms like heterochrony.

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