Journal ArticleDOI
Hormonal control of sexual differentiation: changes in electric organ discharge waveform
Andrew H. Bass,Carl Hopkins +1 more
TLDR
In this paper, it was shown that androgens affect the electric organ of mormyrid electric fishes and not only the electrophoresis, but also the waveform and duration of electric organ discharge.Abstract:
Males and females of some mormyrid electric fishes generate electrical pulses that differ in waveform and duration. For one such species, testosterone or dihydrotestosterone induces females and immature males to produce the mature male electric organ discharge which is two times the duration of the female or immature discharge. Estradiol has only a weak effect. For a second species where males and females have similar electric organ discharges, testosterone produces no effect. The data suggest that androgens affect the electric organ itself.read more
Citations
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Journal ArticleDOI
Androgens in teleost fishes
TL;DR: 11-Oxygenated androgens are generally more effective than T in stimulating secondary sexual characters, reproductive behaviour and spermatogenesis in teleost fishes but receptor-like binding has only reported for T and not for 11KT.
Journal ArticleDOI
The Role of Androgens in Female Vertebrates
Nancy L. Staub,M De Beer +1 more
TL;DR: The functional significance of androgens in females is examined by reviewing studies that document relatively high levels of circulating plasma androgens, androgen receptors, or androgen-metabolizing enzymes in females to hypothesize that androgens play a significant role in normal female development.
Journal ArticleDOI
Sexual Signal Evolution Outpaces Ecological Divergence during Electric Fish Species Radiation
Matthew E. Arnegard,Peter B. McIntyre,Luke J. Harmon,Miriam Leah Zelditch,William G. R. Crampton,Justin K. Davis,John P. Sullivan,Sébastien Lavoué,Carl Hopkins +8 more
TL;DR: In this article, the authors quantitatively compare divergence rates for four traits in African mormyrid fishes, which use an electrical communication system with few extrinsic constraints on divergence, and demonstrate rapid signal evolution in the Paramormyrops species flock compared to divergence in morphology, size and trophic ecology.
Journal ArticleDOI
Design features for electric communication.
TL;DR: The fact that electric signals do not propagate, but exist as electrostatic fields, means that, unlike sound signals, electric organ discharges produce no echoes or reverberations.
References
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Journal ArticleDOI
Neural gonadal steroid actions.
TL;DR: Variability in the occurrence and distribution of particular neural hormonal sensitivities across species may be related to variations in the hormonal requirements for sexual differentiation and for activation of reproductive behaviors.
Journal ArticleDOI
Gonadal Hormones Induce Dendritic Growth in the Adult Avian Brain
TL;DR: Gonadal hormones induce dendritic growth in the adult avian brain in the form of dendrites from a class of neurons in the nucleus robustus archistriatalis, a forebrain nucleus for song control in ovariectomized adult female canaries.
Journal ArticleDOI
Testosterone: a major determinant of extragenital sexual dimorphism
CW Bardin,JF Catterall +1 more
TL;DR: Testosterone rather than 5 alpha-dihydrotestosterone appears to be the major intracellular androgen in organs other than skin and reproductive tract, but other steroid metabolites and their receptors are required to produce the diverse tissue differences observed in males and females.
Journal ArticleDOI
Androgen affects cholinergic enzymes in syringeal motor neurons and muscle
TL;DR: One mechanism for T regulation of singing in passerine birds is through induction of specific enzymatic proteins in androgen target neurons and muscles, and an androgenic effect also operates in addition.
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Temporal Coding of Species Recognition Signals in an Electric Fish
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