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Research Articles in Review

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.
      *Undergraduate author

Published Research Articles

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
      *Undergraduate author

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,, 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

Popular Articles

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).

Popular Media

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.

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