Hadrosaurs Were Perennial Polar Residents

Chinsamy, Anusuya; Thomas, Daniel B.; Tumarkin‐Deratzian, Allison R.; Fiorillo, Anthony R.

doi:10.1002/ar.22428

Cited by 55 publications

(55 citation statements)

References 20 publications

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“…Beside LAGs and annuli, we observed vascularization shifts in the primary bone of two Kentrosaurus samples. These are very similar to the textural shifts documented in the polar Edmontosaurus (Chinsamy et al, ), in which periodic shifts from circumferential to reticular FLB are observed. Shifts are less distinct in Kentrosaurus than in the polar Edmontosaurus , but they are more distinct and frequent than in the temperate Edmontosaurus (Chinsamy et al, ).…”

Section: Discussionsupporting

confidence: 88%

“…Bone histology of extinct animals provides a host of information about their biology (e.g., Erickson and Brochu, ; Botha and Chinsamy, ; Botha‐Brink and Smith, ; Hugi et al, ; Chinsamy‐Turan, ; Prondvai et al, ), and such studies have been widely applied to the Dinosauria (e.g., de Ricqlès, ; Reid, ; Erickson and Tumanova, ; Horner et al, ; Tütken et al, ; Erickson, , Chinsamy‐Turan, ; Cerda and Chinsamy, ; Chinsamy et al, ). However, there is a distinct scarcity of studies of stegosaur bone histology, which may be directly related to the rare occurrence of stegosaurs in the fossil record (Maidment, ).…”

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confidence: 99%

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Bone Histology of the Stegosaur Kentrosaurus aethiopicus (Ornithischia: Thyreophora) from the Upper Jurassic of Tanzania

Redelstorff

Hübner

Chinsamy

et al. 2013

The Anatomical Record

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Using bone histology, a slow growth rate, uncommon for most dinosaurs, has been interpreted for the highly derived stegosaur Stegosaurus (Ornithischia: Thyreophora) and the basal thyreophoran Scutellosaurus. In this study, we examine whether this slow growth rate also occurs in the more basal stegosaur Kentrosaurus from the Tendaguru beds of Tanzania. The bone histology of six femora of Kentrosaurus representing an ontogenetic series from subadult to adult was studied, as well as one scapula. The primary bone is mainly highly vascularized fibro-lamellar bone with some reticular organization of the vascular canals. In addition to LAGs and annuli, distinctive shifts in the pattern of vascularization occur, which have been interpreted as potential growth marks. The variation in the development of growth marks may reflect annual climatic fluctuations. The overall bone depositional rate, and hence growth rate in Kentrosaurus appears to be higher than in Stegosaurus and Scutellosaurus. Considering that Stegosaurus is the larger-sized of the two stegosaurs, this would be contrary to an earlier supposition that small-bodied dinosaurs have slower growth rates than larger ones. Our finding of rapid rates of bone deposition in Kentrosaurus suggests that slow growth rates previously reported in Scutellosaurus and Stegosaurus are not a phylogenetic characteristic of the Thyreophora. Thus, slow growth rates are not plesiomorphic for the Thyreophora. We propose that the slow growth rates documented in the highly derived Stegosaurus could have been secondarily derived or alternatively that Kentrosaurus is the exception having increased growth rates. Anat Rec, 296:933-952, 2013

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Section: Discussionsupporting

confidence: 88%

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confidence: 99%

Bone Histology of the Stegosaur Kentrosaurus aethiopicus (Ornithischia: Thyreophora) from the Upper Jurassic of Tanzania

Redelstorff

Hübner

Chinsamy

et al. 2013

The Anatomical Record

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“…This locality represents the most northerly occurrence of ankylosaur skeletal remains during the Cenomanian, and further solidifies this group, and dinosaurs in general, as persistent residents of high latitude regions [39]–[41]. The region experienced large fluctuations in solar radiation through the year due to its high latitude, likely leading to seasonal growth patterns in vegetation, however these dinosaurs likely persisted in the area as they would have been physically unable to migrate long distances [15],[41]–[42].…”

Section: Discussionsupporting

confidence: 68%

Probable Ankylosaur Ossicles from the Middle Cenomanian Dunvegan Formation of Northwestern Alberta, Canada

Burns

Vavrek²

2014

PLoS ONE

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A sample of six probable fragmentary ankylosaur ossicles, collected from Cenomanian deposits of the Dunvegan Formation along the Peace River, represent one of the first dinosaurian skeletal fossils reported from pre-Santonian deposits in Alberta. Specimens were identified as ankylosaur by means of a palaeohistological analysis. The primary tissue is composed of zonal interwoven structural fibre bundles with irregularly-shaped lacunae, unlike the elongate lacunae of the secondary lamellar bone. The locality represents the most northerly Cenomanian occurrence of ankylosaur skeletal remains. Further fieldwork in under-examined areas of the province carries potential for additional finds.

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“…4). A similar repeating zonal vascular pattern is described in other dinosaurs (Horner et al 1999;Hübner 2012;Hedrick et al 2014) including the hadrosaurid Edmontosaurus (Chinsamy et al 2012). Alaskan specimens of Edmontosaurus were hypothesized to exhibit this vascular cyclicity in place of LAGs and in response to annually reduced nutrient access resulting from non migratory behavior and months of polar darkness (Chinsamy et al 2012).…”

Section: Discussionmentioning

confidence: 71%

Maiasaura, a model organism for extinct vertebrate population biology: a large sample statistical assessment of growth dynamics and survivorship

Woodward¹,

Fowler²,

Farlow³

et al. 2015

Paleobiology

110

188

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Abstract.-Fossil bone microanalyses reveal the ontogenetic histories of extinct tetrapods, but incomplete fossil records often result in small sample sets lacking statistical strength. In contrast, a histological sample of 50 tibiae of the hadrosaurid dinosaur Maiasaura peeblesorum allows predictions of annual growth and ecological interpretations based on more histologic data than any previous large sample study. Tibia length correlates well (R 2 > 0.9) with diaphyseal circumference, cortical area, and bone wall thickness, thereby allowing longitudinal predictions of annual body size increases based on growth mark circumference measurements. With an avian level apposition rate of 86.4 μm/day, Maiasaura achieved over half of asymptotic tibia diaphyseal circumference within its first year. Mortality rate for the first year was 89.9% but a seven year period of peak performance followed, when survivorship (mean mortality rate = 12.7%) was highest. During the third year of life, Maiasaura attained 36% (x = 1260 kg) of asymptotic body mass, growth rate was decelerating (18.2 μm/day), cortical vascular orientation changed, and mortality rate briefly increased. These transitions may indicate onset of sexual maturity and corresponding reallocation of resources to reproduction. Skeletal maturity and senescence occurred after 8 years, at which point the mean mortality rate increased to 44.4%. Compared with Alligator, an extant relative, Maiasaura exhibits rapid cortical increase early in ontogeny, while Alligator cortical growth is much lower and protracted throughout ontogeny. Our life history synthesis of Maiasaura utilizes the largest histological sample size for any extinct tetrapod species thus far, demonstrating how large sample microanalyses strengthen paleobiological interpretations.Holly N. Woodward*. Museum of the Rockies,

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Hadrosaurs Were Perennial Polar Residents

Cited by 55 publications

References 20 publications

Bone Histology of the Stegosaur Kentrosaurus aethiopicus (Ornithischia: Thyreophora) from the Upper Jurassic of Tanzania

Bone Histology of the Stegosaur Kentrosaurus aethiopicus (Ornithischia: Thyreophora) from the Upper Jurassic of Tanzania

Probable Ankylosaur Ossicles from the Middle Cenomanian Dunvegan Formation of Northwestern Alberta, Canada

Maiasaura, a model organism for extinct vertebrate population biology: a large sample statistical assessment of growth dynamics and survivorship

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