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6 results for “hadrosaur”
New application of strontium isotopes reveals evidence of limited migratory behaviour in Late Cretaceous hadrosaurs
<p>Dinosaur migration patterns are very difficult to determine, often relying solely on the geographic distribution of fossils. Unfortunately, it is generally not possible to determine if a fossil taxon's geographic distribution is the result of migration or simply a wide distribution. Whereas some attempts have been made to use isotopic systems to determine migratory patterns in dinosaurs, these methods have yet to achieve wider usage in the study of dinosaur ecology.</p> <p>Here we have used strontium isotope ratios from fossil enamel to reconstruct the movements of an individual hadrosaur from Dinosaur Provincial Park in Alberta, Canada. Results from this study are consistent with a range or migratory pattern between Dinosaur Provincial Park and a contemporaneous locality in the South Saskatchewan River area, Alberta Canada. This represents a minimum distance of approximately 80 km, which is consistent with migrations seen in modern elephants. These results suggest the continent-wide distribution of some hadrosaur species in the Late Cretaceous of North America is not the result of extremely long-range migratory behaviours.</p>
New application of strontium isotopes reveals evidence of limited migratory behaviour in Late Cretaceous hadrosaurs
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Uninterrupted growth in a non-polar hadrosaur explains the gigantism among duck-billed dinosaurs
<p>Duck-billed dinosaurs (Hadrosauridae) were the most common ornithopods of the Late Cretaceous. Second only to sauropods and in many cases exceeding the sizes of the largest land mammals (such as indricotheres or proboscideans), they represent the largest terrestrial herbivores that walked the Earth. Despite their gigantic sizes, diversity, and abundance, their growth strategies remain poorly understood. Herein, we examine the bone microstructure of several Mongolian hadrosauroids of varied adult sizes. The small and middle-sized species have lines of arrested growth (LAGs). On the other hand, one of the largest duck-billed dinosaurs, <i>Saurolophus angustirostris</i>, shows an uninterrupted growth, comparable with other big hadrosaurs for which the lack of cyclical growth arrests was interpreted as a result of living in the polar region. Since both of the studied taxa inhabited warmer, continental, monsoon-influenced environments of the Late Cretaceous Mongolia, we propose that the absence of LAGs is not a climatic-driven condition but rather connected with the animal's size (i.e., ontogeny). Our results show that hadrosaurs, similar to sauropods changed their growth dynamics from cyclical to continuous during their evolution, which made it possible for them to achieve comparable body sizes.</p>
Hadrosaur skulls, Iambeosaurus (top) and Corjthasııurus (bottom) from a publication by Carl Wiman, 1931. in A review of Tyrannosauridae (Dinosauria, Coelurosauria) from New Mexico
Hadrosaur skulls, Iambeosaurus (top) and Corjthasııurus (bottom) from a publication by Carl Wiman, 1931.
Uninterrupted growth in a non-polar hadrosaur explains the gigantism among duck-billed dinosaurs
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Hadrosaur Finger Bone
A finger bone of a hadrosaur from Judith River. <b>Location:</b> Judith River Formation, Montana, USA <b>Age: </b> Campanian, Late Cretaceous <b>Width: </b> 3.5 cm Source: Objaverse 1.0 / Sketchfab
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Allen Brain Atlas
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DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.