Professional Affiliations and Activities
Member, The Paleontological Society (2011 - Present)
Member, Society of Systematic Biologists (2014 - Present)
Member, The Society of Vertebrate Paleontology (2012 - Present)
Member, Society for the Study of Evolution (2014 - Present)
Member, Geological Society of America (2011 - Present)
Education & Certifications
BS, Yale University, Geology and Geophysics: Paleontology and Geobiology (2014)
Current Research and Scholarly Interests
Scientists and non-scientists have forever marveled at the great degree to which life varies in size. Even within modern animals, body sizes span more than 10 orders of magnitude! Biological rules populate the scientific literature in attempts to explain how and why animal body sizes vary. However, very little research has dealt with the effect major environmental adaptations, such as living in water versus on land or living in salt water versus in fresh water, have on body size evolution. One case of a significant relationship can be seen in mammals and reptiles, where we know that marine groups are much larger than their terrestrial relatives.
My overall goal is to improve our understanding of the effect of major evolutionary environmental transitions on the sizes of organisms. Using phylogenetic comparative methods, I analyze various animal groups that inhabit an array of different habitats (such as marine, freshwater, and terrestrial environments) for significant differences in body size between group members that inhabit those different habitats. Taking into account fossil taxa and geologic time, I analyze the reaction of body sizes of these taxa to environmental transitions.
I also employ machine learning to compile data using the DeepDive software, which has been produced by Christopher Ré’s lab at Stanford. I am further developing this software to analyze images in the paleontological literature, producing measurements for specimens that would otherwise never have been included in body size datasets.
Currently, my research is focused on Gastropods (snails and slugs). Gastropoda, the largest group within molluscs, comprises more than 60,000 species of snails, slugs, and limpets, more than one quarter of which are extinct. Gastropod body size spans eight orders of magnitude, with the smallest gastropods having shell volumes of less than .03 cubic millimeters and the largest gastropods having shell volumes of nearly 14,000 cubic centimeters. They are cosmopolitan in distribution and occupy a wide range of habitats, ranging from high mountains to deserts and rainforests, coral reefs, lagoons, and the deep sea, and from the tropics to high latitudes. They are the only molluscs that can be found in deep sea and shallow sea marine, estuarine, freshwater, and terrestrial habitats. Gastropods have made the transition between marine and freshwater and between marine and terrestrial environments more than 4 independent times. While many different animal groups may inhabit both marine and non-marine habitats, this evolutionary history and the long time span over which it has taken place make gastropods uniquely suited for studying the relationships of body size and habitat over time.
- Comparative anatomy of the bony labyrinth of extant and extinct porpoises (Cetacea: Phocoenidae) BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY 2016; 119 (4): 831-846
Melanin Concentration Gradients in Modern and Fossil Feathers
2013; 8 (3)
In birds and feathered non-avian dinosaurs, within-feather pigmentation patterns range from discrete spots and stripes to more subtle patterns, but the latter remain largely unstudied. A ∼55 million year old fossil contour feather with a dark distal tip grading into a lighter base was recovered from the Fur Formation in Denmark. SEM and synchrotron-based trace metal mapping confirmed that this gradient was caused by differential concentration of melanin. To assess the potential ecological and phylogenetic prevalence of this pattern, we evaluated 321 modern samples from 18 orders within Aves. We observed that the pattern was found most frequently in distantly related groups that share aquatic ecologies (e.g. waterfowl Anseriformes, penguins Sphenisciformes), suggesting a potential adaptive function with ancient origins.
View details for DOI 10.1371/journal.pone.0059451
View details for Web of Science ID 000317418500041
View details for PubMedID 23555675