Travis Hagey’s publications
Using geometric morphometrics, we compared toe pad shape of urban and forest dwelling anole lizards (Anolis cristetellus) in Puerto Rico. We found urban lizards had increased their toe pad area by increasing toe pad length more than toe pad width, while the toe pad also covered a larger proportion of the toe length. Urban specimens also had significantly more shape disparity. These results suggest urban environments may represent a source of ecological opportunity for adaptation and diversification and that geometric morphometrics are a great tool to elucidate subtle differences in lizard toe pad shape.
10. Falvey, C.H.*, Aviles-Rodriguez, K.J., Hagey, T.J., and K.M. Winchell. 2020. The Finer Points of Urban Adaptation: Intraspecific Variation in Lizard Claw Morphology. Biological Journal of the Linnean Society. 131: 304-318. PDF
Using geometric morphometrics, we compared the claw shape of different urban and forest dwelling anole lizards. We found urban populations had similar shifts in claw shape, moving towards taller, less curved, less pointed, and shorter claws. Urban populations also had more variables claws. These results suggest urban environments may represent a source of ecological opportunity for adaptation and diversification.
Compiled research guide on Evolutionary Biomechanics, including an overview of the topic and an annotated bibliography of relevant sources.
Modeling the evolution of toe pad performance for gecko and anole lizards using multiple Brownian motion and Ornstein Uhlenbeck based models of trait evolution, we found that Brownian motion with a trend best fit the evolution of adhesion in geckos, while an Ornstein Uhlenbeck model clearly described the evolution of anole adhesion.
7. Hagey, T.J., Harte, S., Vickers, M., Harmon, L.J., and L. Schwarzkopf. 2017. There’s More than One Way to Climb a Tree: Limb Length and Microhabitat Use in Lizards with Toe Pads. PLoS ONE,12(9): e0184641. PDF
To investigate the generality of classic lizard ecomorphological patterns, we considered gecko lizards, finding that as a general pattern, geckos tend to have shorter limbs than anoles. Using more focused microhabitat observations, we found that although gecko and anoles use similar microhabitats we observed geckos with relatively longer limbs using narrower perches, differing from patterns observed in anoles and other lizards.
6. Hagey, T.J., Puthoff, J.B., Crandell, K.E*., Autumn, K, and L.J. Harmon. 2016. Modeling Observed Animal Performance Using the Weibull Distribution. Journal of Experimental Biology, 219: 1603-1607. PDF
We describe a novel approach to model expected animal performance observations using the Weibull distribution. This approach allows for power analyses and conclusions from studies considering animals performance.
5. Hagey, T.J., Cole, N., Davidson, D.*, Henricks, A.*, Harmon, L.L., and L.J. Harmon. 2016. Temporal Variation in Structural Microhabitat Use of PhelsumaGeckos in Mauritius. Journal of Herpetology, 50(1): 102-107. PDF
We investigated the presence of temporal habitat partitioning in Phelsuma geckos from Mauritius with relation to competition. While we did observe temporal variation in microhabitat use, this variation was not clearly associated with the presence of other focal Phelsuma species, suggesting competition may not be responsible for the observed pattern.
We compared the predictions from three setal mathematical models against experimental observations considering both Gekko gecko and Phelsuma grandis, to quantify interspecific variation in setal micromechanics.
My dissertation considered the link between morphology and performance and the relationship between performance and ecology, focusing on the adhesive abilities of geckos. Specifically I considered the relationship between gecko setal morphology and performance, the diversity of adhesive performance across padded lizards, and correlations between gecko adhesive performance, limb morphology, and microhabitat use.
2. Yoder, J.B., DesRoches, S., Eastman, J.M., Gentry, L., Godsoe, W.K.W., Hagey, T.J., Jochimsen, D., Oswald, B.P., Robertson, J., Sarver, B.A.J., Schenk, J.J., Spear, S.F., and L.J. Harmon. 2010. Ecological Opportunity and the Origin of Adaptive Radiations. Journal of Evolutionary Biology,23: 1581-1596. PDF
We propose that ecological opportunity can promote adaptive radiation by generating specific changes to the selective regimes acting on natural populations, both by relaxing effective stabilizing selection and by creating conditions that ultimately generate diversifying selection, assessing theoretical and empirical evidence.
After quantifying the foraging behavior of the invasive Jackson’s chameleon (Chamaeleo jacksonii xantholophus), in Hawai’i, our results support previous findings that chameleons are ‘‘cruise foraging” lizards.