acta ethologica

, Volume 21, Issue 3, pp 147–151 | Cite as

Same-sex courtship behaviors in male-biased populations: evidence for the mistaken identity hypothesis

  • Anthony Macchiano
  • Imran Razik
  • Maria Sagot
Original Paper


Same-sex sexual behaviors (SSSB) have been recorded in nearly all major animal groups and are often found in populations with skewed sex ratios (SR). Here, we study the role of sex ratios in the frequency of SSSB to better understand the conditions that give rise to such puzzling behaviors. We observed SSSB in multiple populations of the common fruit fly (Drosophila melanogaster) after manipulation of sex ratios. We also recorded male responses after being pursued by other males. We found more male-male sexual interactions in male-biased populations and a significant decrease of these behaviors after consecutive days of observation. Males pursued by other males reacted to such encounters. Our results provide support for the mistaken identity hypothesis, in which males are unable to differentiate between sexes at first encounter. With this work, we help elucidate possible social conditions that facilitate the appearance of such intriguing behaviors in nature.


Same-sex interactions Homosexual behavior Sex ratios Drosophila melanogaster 



We extend our gratitude to Dr. Peter Newell, of the SUNY Oswego Department of Biological Sciences, for continuously supporting this research by providing live specimens, food supplies, and necessary equipment.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature and ISPA 2018

Authors and Affiliations

  1. 1.Department of Biological SciencesState University of New York at OswegoOswegoUSA

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