Article
Paleontology
Jonathan J. Calede, Winifred A. Kehl, Edward B. Davis
JOURNAL OF PALEONTOLOGY
(2018)
Article
Paleontology
Jonathan J. M. Calede, Jennifer W. Glusman
Article
Multidisciplinary Sciences
Jonathan J. M. Calede, John D. Orcutt, Winifred A. Kehl, Bill D. Richards
Article
Anatomy & Morphology
Jonathan J. M. Calede, Joshua X. Samuels, Meng Chen
JOURNAL OF MORPHOLOGY
(2019)
Article
Evolutionary Biology
Jonathan J. M. Calede, Joshua X. Samuels
JOURNAL OF SYSTEMATIC PALAEONTOLOGY
(2020)
Article
Paleontology
Jonathan J. M. Calede
JOURNAL OF VERTEBRATE PALEONTOLOGY
(2020)
Article
Paleontology
Jonathan J. M. Calede, Donald L. Rasmussen
ANNALS OF CARNEGIE MUSEUM
(2020)
Article
Evolutionary Biology
Yuen Ting Tse, Jonathan J. M. Calede
Summary: The study used geometric morphometrics to analyze skull and dentary morphology in a range of shrew species, finding that morphology is associated with dietary ecology and different shrew species have specific morphological adaptations to food hardness, leading to functional equivalence through evolutionary history. This work lays the foundation for future research on niche partitioning among shrew species and the diet of extinct soricids.
BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
(2021)
Article
Evolutionary Biology
John D. Orcutt, Jonathan J. M. Calede
Summary: Felids have been important predators throughout modern ecosystems and likely in the past as well, but confusion in classification and uncertainty in diversity have made it difficult to understand their paleoecological impact. A new study suggests that distal humeri can be useful tools in identifying different feliform taxa, providing evidence for a new species of Machairodus among large felids from Hemphillian-aged localities in North America. This new taxon highlights the diverse predator fauna during the late Miocene of North America, including some of the largest felids in Earth's history.
JOURNAL OF MAMMALIAN EVOLUTION
(2021)
Article
Zoology
Jonathan J. M. Calede, Andrew Brown
Summary: Geomyoid rodents are a great system for studying sexual dimorphism. While many studies have focused on the sexual size dimorphism within this rodent clade, little has been done to assess the evolutionary patterns and processes associated with this dimorphism. In this study, the researchers used multivariate analyses of cranial measurements and a phylogenetic framework to analyze the distribution of size and shape dimorphism among geomyoids and test for Rensch's rule. The results show that sexual dimorphism is more common in geomyids than heteromyids, but it is not universal. There is also evidence for variation in sexual dimorphism across populations and geographic variation can overwhelm existing sexual dimorphism. The study supports the repeated independent evolution of shape and size dimorphism in geomyoids but does not find support for an association between size and shape dimorphism. Additionally, there is no evidence for Rensch's rule in geomyoids. These findings suggest that the evolution of sexual dimorphism in geomyoids is not easily explained and is the result of multiple evolutionary events. Future studies incorporating phylogenetic relationships will be necessary to fully understand the evolution of sexual dimorphism in geomyoids.
Article
Anatomy & Morphology
Erica A. Scarpitti, Jonathan J. M. Calede
Summary: This study investigated the hypothetical link between tympanic bulla morphology and ecology in rodents, finding an association between bullar shape and locomotion, particularly in fossorial taxa. The phylogenetically informed flexible discriminant analysis showed a weak phylogenetic effect on tympanic morphology, and there was no evidence for differences in bullar hypertrophy across locomotory categories. The application of this approach to fossil rodents showed broad agreements with prior studies and yielded new locomotory inferences for 14 fossil species, suggesting the timing of burrowing diversification in rodents should be reevaluated.
JOURNAL OF ANATOMY
(2022)
Article
Zoology
Lily A. Noftz, Jonathan J. M. Calede
Summary: Morphological analyses play a critical role in quantifying phenotypic variation, identifying taxa, inferring phylogenetic relationships, and shedding light on evolutionary patterns. In this study, skull morphology of geomyoid rodents was analyzed to test for significant differences at the family, genus, and species levels. The results indicate that skull measurements can distinguish geomyoids at different taxonomic levels and reveal size variation within the two families. Additionally, the analysis suggests a closer similarity between the common ancestor of all geomyoids and the common ancestor of heteromyids. The study highlights the importance of morphological analyses in understanding evolutionary relationships in rodents.
Article
Evolutionary Biology
J. J. M. Calede, Y. T. Tse, K. D. Cairns
Summary: This study reports the first occurrence of a smooth-incisor sminthid from North America and provides evidence for a dispersal event of sminthid rodents from Eurasia to North America 30 million years ago via Beringia. The phylogenetic analysis shows a close relationship between the new species and Heosminthus borrae from Mongolia. The morphometric analysis suggests a terrestrial ecology for the new species.
JOURNAL OF SYSTEMATIC PALAEONTOLOGY
(2022)
Article
Multidisciplinary Sciences
Dylan M. Poorboy, Jonathan J. -M. Calede, Andreas S. Chavez
Summary: Bite force is important in foraging and can affect the competitiveness and fitness of mammals. Douglas squirrels and red squirrels in the North Cascades have different diets and bite forces. Hybrid squirrels show morphologies that overlap with red squirrels.
Article
Multidisciplinary Sciences
Joshua X. Samuels, Jonathan J. -M. Calede, Robert M. Hunt
Summary: A new genus and species of a large dipodomyine has been discovered in early Miocene deposits in Oregon, representing the earliest record of the subfamily. The specimen exhibits both ancestral and highly derived cranial features, suggesting a mosaic evolution of open-habitat adaptations in kangaroo rats and mice. The cooling and drying conditions in the late Oligocene and early Miocene likely favored adaptations for life in more open habitats and resulted in increased locomotor specialization over time.