Simpson RK, Wilson DR, Mistakidis AF, Mennill DJ, Doucet, SM. Sympatry drives colour and song divergence in wood-warblers (Parulidae). In Review at Current Biology.
Simpson RK, McGraw KJ, Doucet SM. Iridescent feather photonic structures co-evolve with plumage reflectance, courtship displays, and signal interactions in hummingbirds. In Review at PNAS
Demko AD, Sosa-Lopez JR, Simpson RK, Doucet SM, Mennill DJ. Divergence in plumage, voice, and morphology indicates speciation in Rufous-capped Warblers (Basileuterus rufifrons). In Review at the Auk.
Earl AD, Kimmitt AA, Simpson RK, Yorzinski JL. Female ornamentation in a lekking bird: bright females dominate. In Review at Behavioral Ecology.
Sepp T, Webb E, Simpson RK, Giraudeau M, McGraw KJ, Hutton P. Light at night reduces digestion efficiency of developing birds: an experiment with king quail. In Review at Physiological and Biochemical Zoology.
Reed S*, Simpson RK, McGraw KJ. Feather morphological predictors of angle-dependent color changes in parrot plumage. In Review at Royal Society Open Science.
12. Simpson RK, Mistakidis AF, Doucet SM. 2020. Natural and sexual selection shape the evolution of colour and conspicuousness in North American wood-warblers (Parulidae). Advanced Access. link
11. Simpson RK, McGraw KJ 2019. Interspecific covariation in courtship displays, iridescent plumage, solar orientation, and their interactions in hummingbirds. The American Naturalist, 184: 441-454. PDF
Media Coverage: ASU Now
10. Saini C*, Hutton P, Gao S, Simpson RK, Giraudeau M, Sepp T, Webb E, McGraw KJ. 2019. Exposure to artificial light at night increases innate immunity during development in a precocial bird. Journal of Comparative Biochemistry and Physiology A, 233: 84-88. PDF
9. Simpson RK, McGraw KJ. 2019. Experimental signal mis-matches uncover specificity of evolutionary links between multiple signals and their interactions in hummingbirds. Evolution, 73: 436-451. PDF
Media Coverage: Evolution Digest
8. Simpson RK, McGraw KJ. 2018. It’s not just what you have, but how you use it: solar-positional and behavioural effects on hummingbird colour appearance during courtship. Ecology Letters, 21: 1413-1422. PDF
Media Coverage: Science (Video), Forbes
7. Simpson RK, McGraw KJ. 2018. Multiple signaling in a variable environment: expression of song and color traits as a function of ambient sound and light. Biotropica 50: 531-540. PDF
6. Simpson RK, McGraw KJ. 2018. Two ways to display: male broad-tailed hummingbirds exhibit different dynamic color tactics based on sun orientation. Behavioral Ecology 29: 637-648. Link
Media Coverage: Oxford University Press Tumblr
5. Simpson RK. 2017. Courtship and territorial behaviors of three hummingbird species in Arizona. Arizona Birds 2017: 1-7. PDF
4. Ligon RA, Simpson RK, Mason NA, Hill GE, McGraw KJ. 2016. Evolutionary innovation and the diversification of carotenoid-based pigmentation in finches. Evolution 70: 2839-2852. PDF
3. Hutton P,* Ligon RA, McGraw KJ, Seymoure BM, Simpson RK. 2015. Dynamic color communication. Current Opinions in Behavior 6: 41-49. PDF
*All authors contributed equally
2. Simpson RK, Johnson MA, Murphy TG. 2015. Migration and the evolution of sexual dichromatism: evolutionary loss of female coloration with migration among wood-warblers. Proceedings of the Royal Society B. 282: 2015375. PDF
Media Coverage: Science, Nature, IFL Science, Phys.org, Nature World News, Richard Dawkins Foundation
1. Murphy TG, West JA, Pham TT, Cevallos LM, Simpson RK, Tarvin KA. 2014. Same trait, different signals: Unlike females, male goldfinches do not signal status with bill color. Animal Behaviour 93: 121-127. PDF
Simpson RK. 2018. How do male hummingbird dance moves alter their appearance? Oxford University Press blog guest post (link).
Simpson RK. 2014. Ask A Biologist Top Question: Why do leaves change color. ASU’s Ask A Biologist (link).
Simpson RK. 2014. Biology Bits: Feathers. ASU’s Ask A Biologist (link).
Created in: 2017. How Animals Can Change Colors. Science Insider (link).
Credited in: Coneflower Studios. 2016. Super Hummingbirds. PBS Nature (link).
Featured in: Sturm, M. 2014. Faint of Heart Need Not Apply. ASU’s SOLS Magazine. 10, 1: 19-23.