Differential effects of 11-ketotestosterone on dimorphic traits in a teleost with alternative male reproductive morphs

Hormones and Behavior
Jonathan S F Lee, A H Bass

Abstract

Species with dimorphic males typically have one morph (type I) associated with territoriality and courtship, and another morph (type II) associated with cuckoldry. In teleost fishes, type I males generally have higher levels of the androgen 11-ketotestosterone (KT) than type II males. Is KT causal to phenotypic differences between morphs? We investigated this question in the midshipman fish (Porichthys notatus) in which type I males have detectable levels of KT during the breeding season, whereas levels in type II males are usually undetectable. Type I midshipman will either cuckold or hold territories and court females, whereas type II males are only known to cuckold. Acoustic courtship by type I's is supported by the sonic motor nucleus, which innervates a sound-producing sonic muscle. Type I males have larger sonic motor nuclei and larger sonic muscles than type II males, consistent with the more dynamic vocal repertoire of type I's. Here, we tested whether intraperitoneal KT implants in adult type II males would induce type I male-like traits in brain, sonic muscle, and behavior. Type II's treated with KT did not differ from blank-implanted type II's in sonic motor nucleus volume. Sonic muscle mass increased in KT-implanted...Continue Reading

References

Dec 1, 1985·Hormones and Behavior·A P Arnold, S M Breedlove
Jan 1, 1993·Brain, Behavior and Evolution·R K BrantleyA H Bass
Dec 19, 1998·The Journal of the Acoustical Society of America·Jessica R McKibben, A H Bass
Nov 24, 1999·General and Comparative Endocrinology·C M Foran, A H Bass
Nov 3, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·S J SalekJ Godwin
May 9, 2002·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Rui F OliveiraAdelino V M Canário
Jul 18, 2002·Journal of Neuroendocrinology·T Rhen, D Crews
Mar 15, 2003·Progress in Neurobiology·A H Bass, Jessica R McKibben
Feb 26, 2004·General and Comparative Endocrinology·Joseph A SisnerosA H Bass
Jul 2, 2004·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Luke Remage-Healey, A H Bass

Citations

Jan 27, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Karen P MaruskaAllen F Mensinger
Aug 30, 2014·Frontiers in Neuroendocrinology·Paul M ForlanoA H Bass
Aug 14, 2012·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Edward M MagerM Danielle McDonald
Oct 11, 2017·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Lisa A Mangiamele, Matthew J Fuxjager

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