Research Articles

12. Simpson, R.K., McGraw, K.J. 2018. Effects of human-induced rapid environmental change on sexual selection. In prep. for Behavioral Ecology and Sociobiology.

11. Simpson, R.K., McGraw, K.J. 2018. Experimental signal mis-matches uncover specificity of evolutionary links between multiple signals and their interactions in hummingbirds. In prep. for Evolution.

10. Simpson, R.K., McGraw, K.J. 2018. The evolution of complex courtship signals and their interactions in hummingbird visual traits. In review at Nature Ecology and Evolution.

9. Saini, C., Hutton, P., Gao, S., Simpson, R.K., Giraudeau, M., Sepp, T., Webb, E., McGraw, K.J. 2018. Exposure to artificial light at night increases innate immune activity during development in a precocial bird. In review at Biology Letters.

8. Simpson, R.K. & McGraw, K.J. 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, R.K. & McGraw, K.J. 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, R.K. & McGraw, K.J. 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, R.K. 2017. Courtship and territorial behaviors of three hummingbird species in Arizona. Arizona Birds 2017: 1-7. PDF

4. Ligon, R.A., Simpson, R.K., Hill, G.E., McGraw, K.J. 2016. Evolutionary innovation and the diversification of carotenoid-based pigmentation in finches. Evolution 70: 2839-2852. PDF

3. Hutton, P.,* Ligon, R.A., McGraw, K.J., Seymoure, B.M., Simpson, R.K. 2015. Dynamic color communication. Current Opinions in Behavior 6: 41-49. PDF
* All authors contributed equally

2. Simpson, R.K., Johnson, M.A., Murphy, T.G. 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,, Nature World News, Richard Dawkins Foundation

1. Murphy, G.M., West, J.A., Pham, T.T., Cevallos, L.M., Simpson, R.K., Tarvin, K.A. 2014. Same trait, different signals: Unlike females, male goldfinches do not signal status with bill color. Animal Behaviour 93: 121-127. PDF

Popular Articles

Simpson, R.K. 2018. How do male hummingbird dance moves alter their appearance? Oxford University Press blog guest post (link).

Simpson, R.K. 2014. Ask A Biologist Top Question: Why do leaves change color. ASU’s Ask A Biologist (link).

Simpson, R.K. 2014. Biology Bits: Feathers. ASU’s Ask A Biologist (link).

Popular Media

Created in: 2017. Why some things are shiny? INSIDER Science (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.

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