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Same-Sex Partner Preference in Zebra Finches: Pairing Flexibility and Choice

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Abstract

This study examined flexibility and choice in same-sex pair-bonding behavior in adult zebra finches (Taeniopygia guttata). Zebra finches form life-long monogamous relationships and extra pair behavior is very low, making them an ideal species in which to study same-sex pairing. We examined same-sex behaviors using both semi-naturalistic choice paradigms and skewed sex ratios. In the first experiment, we allowed zebra finches to pair in aviaries with equal sex ratios as part of multiple experiments. On average, 6.4 % (N = 78) of unmanipulated pairs were same-sex: all but one was female–female. In a second experiment, we identified pairs from same-sex cages and selected 20 total same-sex pairs (10 of each sex). We then gave pairs a chance to court and pair with members of the opposite sex and observed their behavior for three days. Females did not retain their partner, but most paired with males. In contrast, some males did retain their partner. Similarly, females were more likely to engage in pairing behaviors with males than with their partners or other females whereas males were equally likely to engage in same-sex and opposite-sex pairing behaviors. These findings suggest that same-sex partnerships in zebra finches can be facultative, based on the sex ratio of the group in which they live, but can also be a choice, when opportunities to pair with opposite-sex individuals are possible. Furthermore, it is possible that females are more flexible in this choice of same-sex partnerships than are males.

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Acknowledgments

This work is dedicated to Elizabeth Adkins-Regan, who is an amazing mentor and was the first to describe same-sex behavior in zebra finches. We would like to thank Alyssa Pedersen, Kimberly LaPlante, Daniel Vahaba, and Kristina Smiley for their contributions to Experiment 1.

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  1. Department of Psychology, Wayne State University, 5057 Woodward Ave, 7th Floor, Detroit, MI, 48202, USA

    Michelle L. Tomaszycki & Brendon P. Zatirka

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  1. Michelle L. Tomaszycki
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  2. Brendon P. Zatirka
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Correspondence to Michelle L. Tomaszycki.

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Tomaszycki, M.L., Zatirka, B.P. Same-Sex Partner Preference in Zebra Finches: Pairing Flexibility and Choice. Arch Sex Behav 43, 1469–1475 (2014). https://doi.org/10.1007/s10508-014-0377-0

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  • DOI: https://doi.org/10.1007/s10508-014-0377-0

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