Ontogenetic dietary shifts in Deinonychus antirrhopus (Theropoda; Dromaeosauridae): Insights into the ecology and social behavior of raptorial dinosaurs through stable isotope analysis

  title={Ontogenetic dietary shifts in Deinonychus antirrhopus (Theropoda; Dromaeosauridae): Insights into the ecology and social behavior of raptorial dinosaurs through stable isotope analysis},
  author={Joseph A. Frederickson and Michael H. Engel and Richard. Cifelli},
  journal={Palaeogeography, Palaeoclimatology, Palaeoecology},
Ecomorphospace occupation of large herbivorous dinosaurs from Late Jurassic through to Late Cretaceous time in North America
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
Two emetolite-pterosaur associations from the Late Jurassic of China: showing the first evidence for antiperistalsis in pterosaurs
Knowledge about the pterosaur diet and digestive system is limited, and there is little direct evidence in the fossil record. Here, we report two specimens of the wukongopterid Kunpengopterus
Testing for a dietary shift in the Early Cretaceous ceratopsian dinosaur Psittacosaurus lujiatunensis
2D mechanical analysis of the jaws of a hatchling and an adult to determine the differences between the two systems found some differences, but these were only modest; the adult was better suited to feeding on tough plant material than the hatchling, based on its higher values of absolute and relative bite forces.
Epidermal complexity in the theropod dinosaur Juravenator from the Upper Jurassic of Germany
Epidermal scales among modern reptiles are morphologically diverse and serve a variety of functions ranging from moisture balance to chemoreception. Despite being predominantly squamous‐skinned
Size-mediated competition and community structure in a Late Cretaceous herbivorous dinosaur assemblage
It has been argued that, throughout the Mesozoic, the immature growth forms of megaherbivorous dinosaurs competitively excluded small herbivorous dinosaur species, leading to the left-skewed species
Dinosaur biodiversity declined well before the asteroid impact, influenced by ecological and environmental pressures
It is found that the decline of dinosaurs was likely driven by global climate cooling and herbivorous diversity drop, and the latter is likely due to hadrosaurs outcompeting other herbivores.
Theropod guild structure and the tyrannosaurid niche assimilation hypothesis: implications for predatory dinosaur macroecology and ontogeny in later Late Cretaceous Asiamerica
  • T. Holtz
  • Environmental Science, Geography
  • 2021
Well-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-Maastricht...
Comment on “The influence of juvenile dinosaurs on community structure and diversity”
It is argued that the supporting dataset is skewed toward Late Cretaceous North America and that the gap was likely absent during other intervals in most geographic regions, and should be considered for broader consideration.
The diet of early birds based on modern and fossil evidence and a new framework for its reconstruction
  • C. Miller, M. Pittman
  • Environmental Science, Geography
    Biological reviews of the Cambridge Philosophical Society
  • 2021
This work proposes a set of comparable, quantitative approaches to ascertain fossil bird diet and reports the current state of knowledge of non-avian avialan diet, expecting dietary knowledge and evolutionary trends to become much clearer in the coming years.


A Reevaluation of Cooperative Pack Hunting and Gregariousness in Deinonychus antirrhopus and Other Nonavian Theropod Dinosaurs
The hypothesis of mammal-like cooperative pack hunting in D. antirrhopus and other nonavian theropods is assessed by examining the behaviors of extant diapsids and it is concluded that this hypothesis is both unparsimonious and unlikely for these taxa and that the null hypothesis should therefore be that nonavIAN theropod dinosaurs were solitary hunters or, at most, foraged in loose associations.
The Predatory Ecology of Deinonychus and the Origin of Flapping in Birds
“stability flapping” is described, a novel behaviour executed for positioning and stability during the initial stages of prey immobilisation, which may have been pivotal to the evolution of the flapping stroke.
Cannibalism as the cause of an ontogenetic shift in habitat use by fry of the threespine stickleback
It is concluded that small fry occupy vegetation as a refuge from cannibalism once fry have reached the size-threshold at which they are no longer vulnerable to adult conspecifics they are able to forage farther from vegetation thereby reducing risk of predation by insects in vegetation and possibly acquiring more abundant food resources.
Niche Partitioning in Theropod Dinosaurs: Diet and Habitat Preference in Predators from the Uppermost Cedar Mountain Formation (Utah, U.S.A.)
We explore hypothetical ecologies to explain diversity among predatory dinosaurs in North America’s medial Cretaceous, based on occurrence, tooth morphology, and stable isotope analysis. The
Ontogenetic habitat shift and risk of cannibalism in the common chameleon (Chamaeleo chamaeleon)
The field experiments showed that juveniles actively avoid the presence of adults by concealment or flight and the risk of cannibalism towards juveniles is an important selective force behind the ontogenetic habitat shift observed in the common chameleon.
Characterising ontogenetic niche shifts in Nile crocodile using stable isotope (δ13C, δ15N) analyses of scute keratin
Stable carbon and nitrogen isotope analysis of scute keratin, together with breakpoint modelling analysis can be used to characterise ontogenetic niche shifts in crocodile populations and identify size-specific crocodile groups displaying similar traits.
Lizards from the Lower Cretaceous (Aptian–Albian) Antlers and Cloverly Formations
Abstract Recent discoveries from the Aptian–Albian Antlers (Oklahoma) and Cloverly (Montana, Wyoming) formations provide significant additions to the Early Cretaceous record of lizards in North
Diet of the Nile Crocodile (Crocodylus niloticus) in the Okavango Delta, Botswana
The stomachs of 286 Nile Crocodiles were lavaged over a two-year period and seven species of nematodes were found within the stomachs, four of which represent new geographic records.
Evidence for juvenile groups in the ornithopod dinosaur Tenontosaurus tilletti Ostrom
These recent discoveries have generated a number of hypotheses on the reproductive behavior of dinosaurs relating to the extent of parental care, fidelity in nesting sites, and the aggregation of juveniles into groups.