Document Detail


Plasticity of the electric organ discharge waveform of the electric fish Brachyhypopomus pinnicaudatus. I. Quantification of day-night changes.
MedLine Citation:
PMID:  9861708     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The electric organ discharge of the gymnotiform fish Brachyhypopomus pinnicaudatus is a biphasic waveform. The female's electric organ discharge is nearly symmetric but males produce a longer second phase than first phase. In this study, infrared-sensitive video cameras monitored the position of unrestrained fish, facilitating precise measurement of electric organ discharge duration and amplitude every 2 h for 24 h. Males (n = 27) increased electric organ discharge duration by 37 +/- 12% and amplitude by 24 +/- 9% at night and decreased it during the day. In contrast, females (n = 8) exhibited only minor electric organ discharge variation over time. Most of a male's increase occurred rapidly within the first 2-3 h of darkness. Electric organ discharge values gradually diminished during the second half of the dark period and into the next morning. Modulation of the second phase of the biphasic electric organ discharge produced most of the duration change in males, but both phases changed amplitude by similar amounts. Turning the lights off at mid-day triggered an immediate increase in electric organ discharge, suggesting modification of existing ion channels in the electric organ, rather than altered genomic expression. Exaggeration of electric organ discharge sex differences implies a social function. Daily reduction of duration and amplitude may reduce predation risk or energy expenditure.
Authors:
C R Franchina; P K Stoddard
Related Documents :
21650088 - Perceived motion is influenced by random dynamic information.
19597148 - Warfare rather than agriculture as a critical influence on fires in the late holocene, ...
2355948 - Antigravity posture for analysis of motor unit recruitment: the "45 degree test".
11102498 - Reliability of a fly motion-sensitive neuron depends on stimulus parameters.
9680948 - Frequency domain-based models of skeletal muscle.
22894548 - Resilience of disposable endoscope optical fiber properties after repeat sterilization.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of comparative physiology. A, Sensory, neural, and behavioral physiology     Volume:  183     ISSN:  -     ISO Abbreviation:  J. Comp. Physiol. A     Publication Date:  1998 Dec 
Date Detail:
Created Date:  1999-01-08     Completed Date:  1999-01-08     Revised Date:  2014-07-21    
Medline Journal Info:
Nlm Unique ID:  8413199     Medline TA:  J Comp Physiol A     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  759-68     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Action Potentials / physiology
Animals
Behavior, Animal / physiology
Circadian Rhythm / physiology*
Darkness
Electric Fish / physiology*
Electric Organ / physiology*
Electrophysiology
Female
Lighting
Male
Neuronal Plasticity / physiology*
Sex Factors
Temperature
Grant Support
ID/Acronym/Agency:
GM08205-11/GM/NIGMS NIH HHS

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


Previous Document:  Assessing the roles of glutamatergic and cholinergic synaptic drive in the control of fictive swimmi...
Next Document:  Effects of biparental rearing on ultrasonic vocalization (USV) responses of rat pups (Rattus norvegi...