Document Detail

Divergence in androgen sensitivity contributes to population differences in sexual dimorphism of electrocommunication behavior.
MedLine Citation:
PMID:  23142327     Owner:  NLM     Status:  MEDLINE    
Weakly-electric fish (Apteronotidae) produce highly diverse electrocommunication signals. Electric organ discharges (EODs) vary across species, sexes, and in the magnitude and direction of their sexual dimorphism. Gonadal steroid hormones can modulate EODs, and differences in androgen sensitivity are hypothesized to underlie variation in the degree of sexual dimorphism across species. In this study, we asked whether variation in androgen sensitivity explained variation in sexual dimorphism of EODs within species, at the population level. We examined two populations of black ghost knifefish (Apteronotus albifrons), one from the Orinoco and the other from the Amazon River Basin. EOD frequency (EODf) and chirp rates were measured to characterize diversity in sexual dimorphism across populations. The magnitude of sexual dimorphism in EODf differed significantly across populations, and was more pronounced in the Orinoco population than in the Amazon population. Chirp rates were sexually monomorphic in both populations. 11-Ketotestosterone (11-kT) was administered over a two-week period to assess population differences in sensitivity to androgens. 11-kT masculinized EODf significantly more in the population with the greater degree of sexual dimorphism. 11-kT had no effect on the sexually monomorphic chirping rates. We conclude that population divergence in androgen sensitivity contributes to variation in sexual dimorphism of EODf in A. albifrons.
Winnie W Ho; Jessie M Rack; G Troy Smith
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-11-08
Journal Detail:
Title:  Hormones and behavior     Volume:  63     ISSN:  1095-6867     ISO Abbreviation:  Horm Behav     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-08     Completed Date:  2013-06-24     Revised Date:  2014-01-10    
Medline Journal Info:
Nlm Unique ID:  0217764     Medline TA:  Horm Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  49-53     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
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MeSH Terms
Androgens / physiology*
Animal Communication*
Behavior, Animal / drug effects,  physiology
Electric Fish / physiology*
Electric Organ / drug effects,  physiology*
Sex Characteristics*
Testosterone / analogs & derivatives,  pharmacology
Grant Support
Reg. No./Substance:
0/Androgens; 3XMK78S47O/Testosterone; 53187-98-7/11-ketotestosterone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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