[dinosaur] Dinosaur early evolution environmental and physiological contraints (free pdf)

Ben Creisler
[email protected]

A new paper in preprint form with free pdf:

David M. Lovelace, Scott A. Hartman, Paul D. Mathewson, Benjamin J.
Linzmeier & Warren P. Porter (2019)
Modeling Dragons: Using linked mechanistic physiological and microclimate
models to explore environmental, physiological, and morphological
constraints on the early evolution of dinosaurs.
bioRxiv 790980 (preprint)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1101_790980&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=AakYdId64jBsjjEu4dIkL-IUMNyCyvrHXr9XMaHbKUM&s=K2LpmB7XzN65jjPNcOV98fY71MB5He-9IZzDqK4Q8j4&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.biorxiv.org_content_10.1101_790980v1&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=AakYdId64jBsjjEu4dIkL-IUMNyCyvrHXr9XMaHbKUM&s=NNjeiXy5HUjABjLiwB-Pi9DoxIjSzFADgAD824wNBQc&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.biorxiv.org_content_biorxiv_early_2019_10_02_790980.full.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=AakYdId64jBsjjEu4dIkL-IUMNyCyvrHXr9XMaHbKUM&s=jW3S2_Gr7cDneQCey8bH4IsaF_4ZocJnE7SARd75VQY&e= 



We employed the widely-tested biophysiological modeling software, Niche
Mapper™ to investigate the metabolic function of Late Triassic dinosaurs
Plateosaurus and Coelophysis during global greenhouse conditions. We tested
them under a variety of assumptions about resting metabolic rate, evaluated
within six microclimate models that bound paleoenvironmental conditions at
12° N paleolatitude, as determined by sedimentological and isotopic proxies
for climate within the Chinle Formation of the southwestern United States.
Sensitivity testing of metabolic variables and simulated "metabolic
chamber" analyses support elevated "ratite-like" metabolic rates and
intermediate "monotreme-like" core temperature ranges in these species of
early saurischian dinosaur. Our results suggest small theropods may have
needed partial to full epidermal insulation in temperate environments,
while fully grown prosauropods would have likely been heat stressed in
open, hot environments and should have been restricted to cooler
microclimates such as dense forests (under any vegetative cover) or those
seen at higher latitudes and elevations. This is in agreement with the Late
Triassic fossil record and may have contributed to the latitudinal gap in
the Triassic prosauropod record.

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