Abstract
A species’ trophic ecomorphology can change drastically following the colonization of a new environment. Resource shifts may result in dietary change of colonists and therefore, the evolution of ecomorphological adaptations such as changes in bite force, head, and body size. To understand the drivers and dynamics of ecomorphological change after colonization we studied prey availability, diet, performance, and morphology in three lizard species (Aspidoscelis inornata, Holbrookia maculata, and Sceloporus cowlesi) in the ecologically distinct environment of White Sands, New Mexico. White Sands, which formed within the last 6,000 years, was most likely colonized by nearby “dark soils” populations. Therefore, for each species we compared White Sands individuals to conspecific inhabiting the surrounding Chihuahuan Desert habitat. The White Sands habitat had higher prey morphospecies richness, increased breadth of prey orders, and a higher percentage of hard-bodied prey than the dark soils habitat. Differences in prey availability in White Sands and dark soils habitats were reflected in lizard diets. Specifically, morphospecies richness and percentage of hard bodied prey were higher in the diet of White Sands lizards compared to dark soils lizards. These similarities in resource use across the three species in two habitats indicated parallel responses to a shared environment. Although some dietary shifts in the three species were predictable and reflected prey availability, differences in performance and morphology traits indicated different ecological responses in each species. In general, average prey hardness was higher in the two White Sands species that had stronger absolute bite force and larger absolute head size. While White Sands lizards generally also included a larger proportion of hard prey in their diets, had higher absolute bite-force, head size, and body size than dark soils lizards, the magnitude of these differences varied across species.
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Acknowledgments
We thank White Sands National Monument, White Sands Missile Range, Jornada Long-term Ecological Research Station and New Mexico Department of Game and Fish for providing field permits. We thank J. Torresdal, K. Hardwick, J. Robertson, A. Krohn, D. Burkett, P. Culter, and D. Bustos for field help and the Rosenblum and Harmon labs for manuscript feedback. We thank A. Herrel and D. Irschick for feedback on methodology and reviews of the manuscript. We also thank the anonymous reviewers for their helpful feedback. Funding was provided through a National Science Foundation CAREER grant to EBR (DEB-1054062), a Natural Science and Engineering Research Council of Canada PGS-D fellowship, an American Society of Ichthyologists and Herpetologists Gaige grant, and an University of Idaho Student Grant Program grant to SD. All live animal work was conducted with relevant Animal Care and Use Committee permits (University of Idaho, Protocol #2010-48).
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Des Roches, S., Brinkmeyer, M.S., Harmon, L.J. et al. Ecological release and directional change in White Sands lizard trophic ecomorphology. Evol Ecol 29, 1–16 (2015). https://doi.org/10.1007/s10682-014-9740-9
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DOI: https://doi.org/10.1007/s10682-014-9740-9
Keywords
- Functional morphology
- Adaptation
- Rapid evolution
- Diet
- Bite force
- Performance
- Colonization
- Convergence