2007
DOI: 10.1016/j.physbeh.2006.08.013
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Circadian rhythms in electric waveform structure and rate in the electric fish Brachyhypopomus pinnicaudatus

Abstract: Weakly electric fish have long been known to express day-night oscillations in their discharge rates, and in the amplitude and duration of individual electric organ discharges (EODs). Because these oscillations are altered by social environment and neuroendocrine interactions, electric fish are excellent organisms for exploring the social and neuroendocrine regulation of circadian rhythm expression. Previous studies asserting that these oscillations are circadian rhythms have been criticized for failing to con… Show more

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Cited by 56 publications
(65 citation statements)
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“…The baseline EOD rate remained low while fish was at rest (Figure 2E bottom), but the EOD rate became significantly higher while the fish actively swam (Figure 2F top). Our observation is consistent with the positive correlation between the EOD rate and the fish movement as previously reported 8,9,34,35 .…”
Section: Eod Tracking Resultssupporting
confidence: 93%
“…The baseline EOD rate remained low while fish was at rest (Figure 2E bottom), but the EOD rate became significantly higher while the fish actively swam (Figure 2F top). Our observation is consistent with the positive correlation between the EOD rate and the fish movement as previously reported 8,9,34,35 .…”
Section: Eod Tracking Resultssupporting
confidence: 93%
“…The sexual dimorphisms in EOD occur across multiple dimensions: males enhance the 'masculinity' of their waveform traits during peak breeding hours and in response to social encounters (Franchina and Stoddard, 1998;Hagedorn, 1995;Hagedorn and Zelick, 1989), males display a greater range of EOD modulations in response to challenges than females do in response to the same challenges, and males tend to exhibit larger circadian rhythms in their EOD waveforms than females do (Stoddard et al, 2006a).…”
Section: Model System and Rationalementioning
confidence: 99%
“…In addition, in species with sexually dimorphic EODs, female and juvenile electric fish waveforms can be masculinized by introducing exogenous androgens via injection or implantation (Bass, 1986;Bass and Hopkins, 1983;Franchina, 1997;Hagedorn and Carr, 1985;Hopkins et al, 1990;Meyer et al, 1987;Meyer et al, 1984). Earlier studies investigating the effects of steroid hormones on EOD waveform have focused on electrophysiology of electrocytes, changes in EOD waveform, measured after days (Few and Zakon, 2001) or weeks (Hagedorn and Carr, 1985;Meyer, 1983;Mills and Zakon, 1991 Brachyhypopomus pinnicaudatus display circadian rhythms with greater magnitudes and they respond more dynamically to stressors and social manipulations than females do (Franchina et al, 2001;Franchina and Stoddard, 1998;Markham and Stoddard, 2005;Stoddard et al, 2006a).…”
Section: Chapter 3 Androgens Enhance Peripheral Response To Melanocomentioning
confidence: 99%
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