Steroid hormones in bluegill, a species with male alternative reproductive tactics including female mimicry

Biology Letters
Rosemary Knapp, Bryan D Neff

Abstract

The proximate mechanisms underlying the evolution and maintenance of within-sex variation in mating behaviour are still poorly understood. Species characterized by alternative reproductive tactics provide ideal opportunities to investigate such mechanisms. Bluegill (Lepomis macrochirus) are noteworthy in this regard because they exhibit two distinct cuckolder (parasitic) morphs (called sneaker and satellite) in addition to the parental males that court females. Here we confirm previous findings that spawning cuckolder and parental males have significantly different levels of testosterone and 11-ketotestosterone. We also report, for the first time, that oestradiol and cortisol levels are higher in cuckolders than in parental males. The two cuckolder morphs did not differ in average levels of any of the four hormones. However, among satellite males which mimic females in appearance and behaviour, there was a strong negative relationship between oestradiol levels and body length, a surrogate for age. This finding suggests that for satellite males, oestradiol dependency of mating behaviour decreases with increasing mating experience. Although such decreased hormone dependence of mating behaviour has been reported in other taxa, our...Continue Reading

References

Nov 17, 2015·Nature Genetics·Clemens KüpperTerry Burke
Feb 24, 2010·Frontiers in Neuroendocrinology·John Godwin
Jun 16, 2009·General and Comparative Endocrinology·Adam S ArterberyAndrew H Bass
Feb 12, 2008·Hormones and Behavior·Andrew H Bass, Luke Remage-Healey
Sep 23, 2016·International Journal of Impotence Research·M NoroozzadehM Rostami Dovom
May 10, 2017·Hormones and Behavior·Madeleine St Clair YewersDevi Stuart-Fox

Citations

Aug 1, 1997·General and Comparative Endocrinology·Rosemary Knapp, M C Moore
Aug 26, 1998·General and Comparative Endocrinology·C M Foran, Andrew H Bass
May 26, 2001·Proceedings. Biological Sciences·P FuM R Gross
Nov 1, 1980·Proceedings of the National Academy of Sciences of the United States of America·M R Gross, E L Charnov
Feb 3, 2007·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Luke Remage-Healey, Andrew H Bass
Feb 1, 1996·Trends in Ecology & Evolution·M R Gross
Jun 1, 1998·Trends in Ecology & Evolution·M Taborsky

Related Concepts

Testosterone Measurement
Estradiol, (16 alpha,17 beta)-Isomer
Estradiol Measurement
Sexual Behavior, Animal
Steroid hormone
Fish <Chondrichthyes>
Mating Behavior
Gonadal Steroid Hormones
Fish <Actinopterygii>
Testosterone

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