Life History, Neuroendocrinology, and Behavior in Fish

Grober, Matthew S.; Bass, Andrew H.

doi:10.1016/b978-012532104-4/50025-1

Cited by 14 publications

(11 citation statements)

References 82 publications

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“…Differential effects of 11-KT and T on behavior have been reported mainly in species with alternative reproductive tactics (Grober and Bass, 2002; Hirschenhauser et al, 2004; Lee and Bass, 2005; Oliveira et al, 2005). In these species, 11-KT levels are highly correlated with aggressive and territorial behaviors of the “bourgeois” phenotypes, while T maintains the female and socially parasitic (sneaker and satellite) male phenotypes.…”

Section: Discussionmentioning

confidence: 99%

Testosterone and 11-ketotestosterone have different regulatory effects on electric communication signals of male Brachyhypopomus gauderio

Goldina

Gavassa

Stoddard

2011

Hormones and Behavior

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The communication signals of electric fish can be dynamic, varying between the sexes on a circadian rhythm and in response to social and environmental cues. In the gymnotiform fish Brachyhypopomus gauderio waveform shape of the electric organ discharge (EOD) is regulated by steroid and peptide hormones. Furthermore, EOD amplitude and duration change on different timescales and in response to different social stimuli, suggesting that they are regulated by different mechanisms. Little is known about how androgen and peptide hormone systems interact to regulate signal waveform. We investigated the relationship between the androgens testosterone (T) and 11-ketotestosterone (11-KT), the melanocortin peptide hormone α-MSH, and their roles in regulating EOD waveform of male B. gauderio. Males were implanted with androgen (T, 11-KT, or blank), and injected with α-MSH before and at the peak of androgen effect. We compared the effects of androgen implants and social interactions by giving males a size-matched male stimulus with which they could interact electrically. Social stimuli and both androgens increased EOD duration, but only social stimuli and 11-KT elevated amplitude. However, no androgen enhanced EOD amplitude to the extent of a social stimulus, suggesting that a yet unidentified hormonal pathway regulates this signal parameter. Additionally, both androgens increased response of EOD duration to α-MSH, but only 11-KT increased response of EOD amplitude to α-MSH. Social stimuli had no effect on EOD response to α-MSH. The finding that EOD amplitude is preferentially regulated by 11-KT in B. gauderio may provide the basis for independent control of amplitude and duration.

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Section: Discussionmentioning

confidence: 99%

Testosterone and 11-ketotestosterone have different regulatory effects on electric communication signals of male Brachyhypopomus gauderio

Goldina

Gavassa

Stoddard

2011

Hormones and Behavior

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“…An elegant series of studies have examined physiological, neuroendocrine, and neurophysiological differences between male morphs in P. notatus ranging from steroid hormone signaling to the activity and response properties of the relevant neural circuitry for key advertisement and communication behaviors (see [64] and citations below). The plainfin midshipman is a marine species native to the west coast of North America.…”

Section: Alternative Male Phenotypesmentioning

confidence: 99%

Neuroendocrinology of sexual plasticity in teleost fishes

Godwin

2010

Frontiers in Neuroendocrinology

160

141

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The study of sex differences has produced major insights into the organization of animal phenotypes and the regulatory mechanisms generating phenotypic variation from similar genetic templates. Teleost fishes display the greatest diversity of sexual expression among vertebrate animals. This diversity appears to arise from diversity in the timing of sex determination and less functional interdependence among the components of sexuality relative to tetrapod vertebrates. Teleost model systems therefore provide powerful models for understanding gonadal and non-gonadal influences on behavioral and physiological variation. This review addresses socially controlled sex change and alternate male phenotypes in fishes. These sexual patterns are informative natural experiments that illustrate how variation in conserved neuroendocrine pathways can give rise to a wide range of reproductive adaptations. Key regulatory factors underlying sex change and alternative male phenotypes that have been identified to date include steroid hormones and the neuropeptides GnRH and arginine vasotocin, but genomic approaches are now implicating a diversity of other influences as well.

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“…However, reproduction requires a coordinated suite of behaviors orchestrated by multiple levels of the nervous system, and they are typically not investigated in the same individuals or even the same species. For example, the neuromuscular systems controlling masculine courtship vocalizations in birds, frogs, and fish and penis movement during copulation in rodents have provided valuable information about relationships between morphology and behavior, including the influences of steroid hormones on them (Breedlove et al, 2002;Grober and Bass, 2002;Wade and Buhlman, 2000;Wade et al, 2002;Zakon and Smith, 2002). However, these types of courtship and copulatory systems are typically not investigated in the same vertebrate groups.…”

Section: Introductionmentioning

confidence: 98%

Current research on the behavioral neuroendocrinology of reptiles

Wade

2005

Hormones and Behavior

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Life History, Neuroendocrinology, and Behavior in Fish

Cited by 14 publications

References 82 publications

Testosterone and 11-ketotestosterone have different regulatory effects on electric communication signals of male Brachyhypopomus gauderio

Testosterone and 11-ketotestosterone have different regulatory effects on electric communication signals of male Brachyhypopomus gauderio

Neuroendocrinology of sexual plasticity in teleost fishes

Current research on the behavioral neuroendocrinology of reptiles

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