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Behavioral Ecology and Sociobiology

, Volume 57, Issue 4, pp 391–397 | Cite as

A simple and inexpensive chemical test for behavioral ecologists to determine the presence of carotenoid pigments in animal tissues

  • Kevin J. McGraw
  • Jocelyn Hudon
  • Geoffrey E. Hill
  • Robert S. Parker
Original Article

Abstract

Animals use several different types of pigments to acquire their colorful ornaments. Knowing the types of pigments that generate animal colors often provides valuable information about the costs of developing bright coloration as well as the benefits of using these signals in social or sexual contexts. It is often assumed that red, orange, and yellow colors in animals are derived from carotenoid pigments, when in fact there are other pigments that confer similar colors on animals. These include the pteridine pigments in a wide range of organisms, hemoglobin in blood-filled sinuses, the psittacofulvins of parrot feathers, and the phaeomelanin pigments in rufous or yellow feathers and fur. In this paper, we describe a quick and easy, two-step chemical method for field biologists to determine if their study species uses carotenoid pigments as integumentary colorants. This laboratory procedure first employs a thermochemical extraction technique, in which acidified pyridine is used under high temperature to free carotenoid pigments from tissue to produce a colorful, pigmented solution. Red, orange, or yellow tissues containing pteridines, hemoglobin, or eumelanins do not release colored pigments into heated pyridine. However, psittacofulvins, and occasionally phaeomelanins, will also solubilize using this method. Thus, a follow-up test is needed, using solvent transfer, to confirm the presence of carotenoids in animal tissues. The use of absorbance spectrophotometry on the colorful solution may also provide information about the predominant carotenoids that bestow color on your study animal.

Keywords

Carotenoids Coloration Pigments Sexual selection 

Notes

Acknowledgements

This paper evolved from several inquiries and discussions at the 9th International Behavioral Ecology Congress in Montreal, Quebec, Canada. The Institutional Animal Care and Use Committee at Cornell University approved all procedures reported in our study (protocol no. 99–89). We thank T. Czeschlik and two anonymous referees for helpful comments on the manuscript. This research was funded by the Environmental Protection Agency (STAR fellowship to K.J.M.); during manuscript preparation, K.J.M. was supported by the United States Department of Agriculture (grant to K. Klasing) and by the College of Liberal Arts and Sciences and the School of Life Sciences at Arizona State University.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Kevin J. McGraw
    • 1
    • 5
  • Jocelyn Hudon
    • 2
  • Geoffrey E. Hill
    • 3
  • Robert S. Parker
    • 4
  1. 1.Department of Neurobiology and BehaviorCornell UniversityIthacaUSA
  2. 2.Provincial Museum of AlbertaEdmontonCanada
  3. 3.Department of Biological SciencesAuburn UniversityAuburnUSA
  4. 4.Division of Nutritional SciencesCornell UniversityIthacaUSA
  5. 5.School of Life SciencesArizona State UniversityTempeUSA

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