Theropod guild structure and the tyrannosaurid niche assimilation hypothesis: implications for predatory dinosaur macroecology and ontogeny in later Late Cretaceous Asiamerica.

dc.contributor.authorHoltz, Thomas Richard Jr
dc.contributor.authorHoltz, Thomas Richard Jr
dc.date.accessioned2022-04-08T20:03:03Z
dc.date.available2022-04-08T20:03:03Z
dc.date.issued2021-06-17
dc.description.abstractWell-sampled dinosaur communities from the Jurassic through the early Late Cretaceous show greater taxonomic diversity among larger (>50 kg) theropod taxa than communities of the Campano-Maastrichtian, particularly to those of eastern/central Asia and Laramidia. The large carnivore guilds in Asiamerican assemblages are monopolized by tyrannosaurids, with adult medium-sized (50–500 kg) predators rare or absent. In contrast, various clades of theropods are found to occupy these body sizes in earlier faunas, including early tyrannosauroids. Assemblages with “missing middle-sized” predators are not found to have correspondingly sparser diversity of potential prey species recorded in these same faunas. The “missing middle-sized” niches in the theropod guilds of Late Cretaceous Laramidia and Asia may have been assimilated by juvenile and subadults of tyrannosaurid species, functionally distinct from their adult ecomorphologies. It is speculated that if tyrannosaurids assimilated the niches previously occupied by mid-sized theropod predators, we would expect the evolution of distinct transitions in morphology and possibly the delay of the achievement of somatic maturity in species of this taxon.en_US
dc.description.urihttps://doi.org/10.1139/cjes-2020-0174
dc.identifierhttps://doi.org/10.13016/gmgw-s3lz
dc.identifier.citationHoltz, T.R., Jr. 2021. Theropod guild structure and the tyrannosaurid niche assimilation hypothesis: implications for predatory dinosaur macroecology and ontogeny in later Late Cretaceous Asiamerica. Canadian Journal of Earth Sciences 58: 778-795. doi: 10.1139/cjes-2020-0174en_US
dc.identifier.urihttp://hdl.handle.net/1903/28566
dc.language.isoenen_US
dc.publisherCanadian Science Publishingen_US
dc.relation.isAvailableAtCollege of Computer, Mathematical & Natural Sciencesen_us
dc.relation.isAvailableAtGeologyen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.subjectdinosaurs ontogeny theropod paleoecology Mesozoic Tyrannosauridaeen_US
dc.titleTheropod guild structure and the tyrannosaurid niche assimilation hypothesis: implications for predatory dinosaur macroecology and ontogeny in later Late Cretaceous Asiamerica.en_US
dc.typeDataseten_US

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