Steroid-dependent plasticity of vocal motor systems: Novel insights from teleost fish

Ah, Bass

doi:10.1016/j.brainresrev.2007.04.006

Cited by 42 publications

(24 citation statements)

References 69 publications

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“…Together, this suggests that the maturation of CPG and patterns of connectivity between hindbrain vocal nuclei may underline the vocal differentiation observed in the Lusitanian toadfish. Future studies should investigate this hypothesis and also whether steroid levels play a role in vocal patterning and plasticity, as reported for adult P. notatus (Bass, 2008). The ability to extend the vocal repertoire to include more elaborated calls through maturation of central vocal nuclei has been predominantly described in birds (Aronov et al, 2008) and mammals (Jürgens, 2002).…”

Section: Ontogenetic Vocal Differentiationmentioning

confidence: 88%

Vocal differentiation parallels development of auditory saccular sensitivity in a highly soniferous fish

Vasconcelos

Alderks

Ramos

et al. 2015

Journal of Experimental Biology

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Vocal differentiation is widely documented in birds and mammals but has been poorly investigated in other vertebrates, including fish, which represent the oldest extant vertebrate group. Neural circuitry controlling vocal behaviour is thought to have evolved from conserved brain areas that originated in fish, making this taxon key to understanding the evolution and development of the vertebrate vocal-auditory systems. This study examines ontogenetic changes in the vocal repertoire and whether vocal differentiation parallels auditory development in the Lusitanian toadfish Halobatrachus didactylus (Batrachoididae). This species exhibits a complex acoustic repertoire and is vocally active during early development. Vocalisations were recorded during social interactions for four size groups (fry: <2 cm; small juveniles: 2-4 cm; large juveniles: 5-7 cm; adults >25 cm, standard length). Auditory sensitivity of juveniles and adults was determined based on evoked potentials recorded from the inner ear saccule in response to pure tones of 75-945 Hz. We show an ontogenetic increment in the vocal repertoire from simple broadband-pulsed 'grunts' that later differentiate into four distinct vocalisations, including low-frequency amplitude-modulated 'boatwhistles'. Whereas fry emitted mostly single grunts, large juveniles exhibited vocalisations similar to the adult vocal repertoire. Saccular sensitivity revealed a three-fold enhancement at most frequencies tested from small to large juveniles; however, large juveniles were similar in sensitivity to adults. We provide the first clear evidence of ontogenetic vocal differentiation in fish, as previously described for higher vertebrates. Our results suggest a parallel development between the vocal motor pathway and the peripheral auditory system for acoustic social communication in fish.

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Section: Ontogenetic Vocal Differentiationmentioning

confidence: 88%

Vocal differentiation parallels development of auditory saccular sensitivity in a highly soniferous fish

Vasconcelos

Alderks

Ramos

et al. 2015

Journal of Experimental Biology

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“…In mammals androgens can shape the male brain but the female brain does not require exposure to estradiol Table 3 The results of cross-covariance analysis between behavior and eeg total power or absolute power spectra for each eeg band and each channel at zero lag Data for analysis were the grand average over all subjects PR1, PR2, PR3 and PR4 the four channels, N number of observations in 24 h (one value for each half hour), R correlation coefficient ** Correlation is significant at the 0.001 level (2-tailed) (Phoenix et al 1959;Amateau and McCarthy 2004). Interestingly, frogs evince robust, hormonally mediated plasticity of vocal motor behaviors and their underlying neural substrates (Kelley 1980;Brenowitz 2004;Bass 2008;Arch and narins 2009;nasipak and Kelley 2012). For example, a female X. laevis will produce male mating calls after exposure to androgens as an adult (emerson and Boyd 1999) and the response of neurons in the auditory midbrain is influenced by reproductive state in frogs (Miranda and Wilczynski 2009).…”

Section: Sex Differences In Eeg Bandsmentioning

confidence: 99%

Electroencephalographic signals synchronize with behaviors and are sexually dimorphic during the light–dark cycle in reproductive frogs

et al. 2013

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“…Androgens in particular regulate the expression of traits relevant for sexual communication (Moore et al, 2005;Ball et al, 2008;Bass, 2008;Godwin, 2010). Nonetheless, communication signals that are regulated by sex steroids rarely reflect sex steroid levels at the time the signals are produced (Adkins-Regan, 2008), which should make it even less likely that signals could accurately reflect other behaviorally relevant phenotypic traits regulated by sex steroids.…”

Section: Can a Hormone-responsive Signal Convey Reliable Information mentioning

confidence: 99%

Behavioral ecology, endocrinology and signal reliability of electric communication

Gavassa

Goldina

Silva

et al. 2013

Journal of Experimental Biology

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SummaryThe balance between the costs and benefits of conspicuous animal communication signals ensures that signal expression relates to the quality of the bearer. Signal plasticity enables males to enhance conspicuous signals to impress mates and competitors and to reduce signal expression to lower energetic and predation-related signaling costs when competition is low. While signal plasticity may benefit the signaler, it can compromise the reliability of the information conveyed by the signals. In this paper we review the effect of signal plasticity on the reliability of the electrocommunication signal of the gymnotiform fish Brachyhypopomus gauderio. We (1) summarize the endocrine regulation of signal plasticity, (2) explore the regulation of signal plasticity in females, (3) examine the information conveyed by the signal, (4) show how that information changes when the signal changes, and (5) consider the energetic strategies used to sustain expensive signaling. The electric organ discharge (EOD) of B. gauderio changes in response to social environment on two time scales. Two hormone classes, melanocortins and androgens, underlie the short-term and long-term modulation of signal amplitude and duration observed during social interaction. Population density drives signal amplitude enhancement, unexpectedly improving the reliability with which the signal predicts the signalerʼs size. The signalʼs second phase elongation predicts androgen levels and male reproductive condition. Males sustain signal enhancement with dietary intake, but when food is limited, they ʻgo for brokeʼ and put extra energy into electric signals. Cortisol diminishes EOD parameters, but energy-limited males offset cortisol effects by boosting androgen levels. While physiological constraints are sufficient to maintain signal amplitude reliability, phenotypic integration and signaling costs maintain reliability of signal duration, consistent with theory of honest signaling. on the reliability of the information conveyed by the signal. In this paper, we (1) discuss the endocrine mechanisms that regulate signal plasticity in males, (2) explore whether those mechanisms are also present in females, (3) examine the information conveyed by the signal, (4) examine how that information changes when the signal changes, and finally (5) consider the energetic strategies used to sustain expensive signaling.

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Steroid-dependent plasticity of vocal motor systems: Novel insights from teleost fish

Cited by 42 publications

References 69 publications

Vocal differentiation parallels development of auditory saccular sensitivity in a highly soniferous fish

Vocal differentiation parallels development of auditory saccular sensitivity in a highly soniferous fish

Electroencephalographic signals synchronize with behaviors and are sexually dimorphic during the light–dark cycle in reproductive frogs

Behavioral ecology, endocrinology and signal reliability of electric communication

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