Ontogenetic dietary shifts in North American hadrosaurids (Dinosauria: Ornithischia)

Wyenberg-Henzler, Taia; Patterson, R. Timothy; Mallon, Jordan C.

doi:10.1016/j.cretres.2022.105177

Cited by 9 publications

(10 citation statements)

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“…It is often proposed that the success of the iguanodontians was due to the possession of complex grinding surfaces based on a series of tooth families, which in derived hadrosaurids each comprise three or four functional teeth in adults and one to three in juveniles and subadults ( Erickson & Zelenitsky, 2014 ; Wyenberg-Henzler, Patterson & Mallon, 2022 ). Such a complex grinding surface is unlikely to have played any role in early competition between sauropods and iguanodontians as more basal iguanodontians ( e.g.…”

Section: Discussionmentioning

confidence: 99%

“…, Janis, 1990 ; Janis, 1995 ; Spencer, 1995 ; Mendoza, Janis & Palmqvist, 2002 ; Mitchell et al, 2018 ) and have been previously used in other dinosaur ecology studies ( e.g. , Whitlock, 2011 ; Mallon & Anderson, 2013 ; Mallon & Anderson, 2015 ; MacLaren et al, 2017 ; Osi et al, 2017 ; Mallon, 2019 ; Wyenberg-Henzler, 2020 ; Wyenberg-Henzler, Patterson & Mallon, 2021 ; Wyenberg-Henzler, Patterson & Mallon, 2022 ) (see Fig. 1 and Table S1 for details) were used assess niche overlap.…”

Section: Methodsmentioning

confidence: 99%

“…Snout shape index was taken following the modified methodology of Dompierre & Churcher (1996) used in Wyenberg-Henzler (2020) and ( Wyenberg-Henzler, Patterson & Mallon, 2021 ; Wyenberg-Henzler, Patterson & Mallon, 2022 ). This snout shape proxy uses photos of the snout taken in dorsal or ventral view to distinguish between wide, square shaped snouts and narrow, pointed snouts.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, demonstrating a lack of dietary overlap requires consideration of traits that are reflective of basic form-function relationships rather than comparisons between gross morphologies. Further, some researchers have more recently suggested that the earlier dismissal of the competitive replacement hypothesis was premature given the masticatory capabilities of hadrosauroids would have permitted a wide niche breadth and recognition of niche shifts through ontogeny ( D’Emic & Foreman, 2012 ; Erickson & Zelenitsky, 2014 ; Wyenberg-Henzler, Patterson & Mallon, 2022 ). Yet, work assessing if morphological dissimilarity was great enough between hadrosauroids and sauropods to have precluded competition remains to be conducted.…”

Section: Introductionmentioning

confidence: 99%

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Ecomorphospace occupation of large herbivorous dinosaurs from Late Jurassic through to Late Cretaceous time in North America

Wyenberg-Henzler¹

2022

PeerJ

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Following the Late Jurassic, megaherbivore communities in North America undergo a dramatic turnover in faunal composition: sauropods decline to the point of becoming relatively minor components of ecosystems, stegosaurs become extinct, and hadrosaurids, ceratopsids and ankylosaurs rise in diversity and abundance. Although a variety of causes have been proposed to account for the dramatic decrease in sauropod diversity following the Late Jurassic and could have also been applicable to the disappearance of stegosaurs, the potential for competitive replacement of sauropods by hadrosauroids as an explanation has been previously dismissed due to morphological differences without further investigation. Using twelve ecomorphological correlates of the skull, this study provides a preliminary investigation into ecomorphospace occupation of major megaherbivore clades from the Late Jurassic through to the Late Cretaceous of North America and assess if morphological differences were enough to have potentially facilitated dietary niche partitioning between sauropods and iguanodontians and stegosaurs and ankylosaurs. Overlap in reconstructed ecomorphospace was observed between sauropods (particularly non-diplodocid sauropods) and iguanodontians, as would be expected if morphological differences were not enough to facilitate niche partitioning, contrary to original claims used to dismiss the competitive replacement hypothesis. Overlap was also observed between stegosaurs and ankylosaurs, particularly between Late Cretaceous ankylosaurs. Whether this overlap is reflective competitive replacement or opportunistic occupation of recently vacated niches will require further assessment as sampling of some clades prior to the Late Cretaceous is too poor to make a reliable assessment and several underlying assumptions necessary for competition to occur (e.g., resource limitation) still need investigation. Teasing out the cause(s) of the ‘sauropod decline’ and extinction of stegosaurs in North America following the Late Jurassic will require future research not only into the competitive exclusion hypothesis, but other hypotheses as well with better sampling from Early Cretaceous and Late Jurassic intervals.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ecomorphospace occupation of large herbivorous dinosaurs from Late Jurassic through to Late Cretaceous time in North America

Wyenberg-Henzler¹

2022

PeerJ

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“…Their documented geographic distribution now includes most continents, and as "duckbills," they are among the few groups of ornithischians with a widely recognized English common name. Recent research involving fossils of hadrosaurs and close relatives spans topics as varied as osteohistological analysis of growth rates and life history (Serrano et al 2021;Wosik and Evans 2022), palaeoecological reconstruction from isotope signatures (Cullen et al 2022;Martin et al 2022), ontogenetic dietary shifts from tooth microwear (Wyenberg-Henzler et al 2022), classification of eggs and embryos (L. Zhu et al 2022), palaeobiological implications of palaeopathologies (Bertozzo et al 2021(Bertozzo et al , 2022Cruzado-Caballero et al 2021;Słowiak et al 2021), and even experimental music creation (Brown 2022).…”

Section: List Of Figuresmentioning

confidence: 99%

Evolution of Hadrosaurs in the Campanian of Laramidia: New Information from the Skull Roof and Braincase

McFeeters¹

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This project seeks to investigate the morphology, ontogeny, and evolution of skull roof and braincase characters in hadrosaurids from the Campanian of northern Laramidia (Alberta and Montana), a setting in which they have been historically recognized as having a high abundance and diversity. New material is evaluated to clarify the distribution and informativeness of morphological character states, allowing for further testing of previous hypotheses about how the ontogenetic development of these characters evolved within clades, and enabling the identification of previously unrecorded taxa. Five partial skulls of Maiasaura peeblesorum are described from a bone bed in the Two Medicine Formation of Montana, providing the basis for a description of the braincase morphology of this taxon, and an ontogenetic series allowing the development of the crest to be compared to related taxa. Two new partial skulls from the middle unit of the Oldman Formation at the Milk River Ridge Reservoir near Warner, southern Alberta both represent first occurrences for taxa in that unit. The first is described as the first diagnostic occurrence of Maiasaura in Canada.Maiasaura and Brachylophosaurus in the middle unit of the Oldman Formation are the first example of co-occurring brachylophosaurins. The second is described as a new taxon of Parasaurolophini, and is the oldest diagnostic lambeosaurine in Alberta. A phylogenetic analysis using maximum parsimony and Bayesian methods supports these identifications, and also reidentifies a previously described specimen from the Dinosaur Park Formation as the geologically youngest brachylophosaurin in Alberta.

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Rare juvenile material constrains estimation of skeletal allometry in Gryposaurus notabilis (Dinosauria: Hadrosauridae)

Mallon

Evans

Zhang

et al. 2022

The Anatomical Record

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In studying the skeletal allometry of any vertebrate, it is important to sample the ontogenetic extremes to ensure the accuracy of parameter estimation; this is particularly true for fossil taxa, where sampling of ontogenetic series is incomplete and sporadic. Previous studies have examined allometry in the skull of the duck-billed dinosaur Gryposaurus notabilis, but these did not include individuals smaller than $65% the maximum known size (based on linear dimensions). Here, we report on the two smallest known examples of this species (a mostly complete skeleton and a partial skull), which are $37% the known maximal size of G. notabilis. Osteohistology indicates that these represent individuals $2 years of age. Allometric analysis demonstrates that most aspects of the skull of G. notabilis grew isometrically, although the height of the nasal arch grew with positive allometry. Early in the ontogeny of G. notabilis, the dentary teeth possessed secondary ridges, which were lost later in life. This finding has important bearing on hadrosaurid tooth taxonomy.The limb proportions of G. notabilis largely grew isometrically (or with weak negative allometry, at most), like some other hadrosaurids, suggesting that the species did not undergo a gait shift with increasing age (unless it occurred very early in ontogeny). We argue that the lack of significant locomotory performance compensation exhibited by young hadrosaurids helps to explain why they apparently formed small, mutualistic aggregations, presumably for protection from large predators.

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Ontogenetic dietary shifts in North American hadrosaurids (Dinosauria: Ornithischia)

Cited by 9 publications

References 78 publications

Ecomorphospace occupation of large herbivorous dinosaurs from Late Jurassic through to Late Cretaceous time in North America

Ecomorphospace occupation of large herbivorous dinosaurs from Late Jurassic through to Late Cretaceous time in North America

Evolution of Hadrosaurs in the Campanian of Laramidia: New Information from the Skull Roof and Braincase

Rare juvenile material constrains estimation of skeletal allometry in Gryposaurus notabilis (Dinosauria: Hadrosauridae)

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