Differential effects of 11-ketotestosterone on dimorphic traits in a teleost with alternative male reproductive morphs

Lee, Jonathan S. F.; Bass, Andrew H.

doi:10.1016/j.yhbeh.2005.01.003

Cited by 29 publications

(21 citation statements)

References 27 publications

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“…Similar results were found for the rock-pool blenny, where both methyltestosterone (MT) and 11-KT implants failed to promote nesting male sexual displays in satellite males (Oliveira et al, 2001c). Also in type II males of the plainfin midshipman 11-KT did not induce type I male sexual behavior (Lee and Bass, 2005). According to the "relative plasticity hypothesis" proposed under the framework of alternative reproductive tactics, hormonal manipulations in adults should be effective in promoting tactic switching in species with plastic tactics but not in species with fixed tactics (Moore, 1991;Moore et al, 1998).…”

Section: Nesting Male Behaviorsupporting

confidence: 63%

“…In the plainfin midshipman, type I males build nests and court females while type II males cuckold the nests of type I males (Brantley and Bass, 1994). Although type II males have lower levels of circulating 11-KT than type I males (Brantley et al, 1993), 11-KT administration to type II males paradoxically promoted cuckoldry (Lee and Bass, 2005). Also in female goldfish, both T and 11-KT failed to suppress female sexual behavior (Kobayashi and Stacey, 1993;Stacey and Kobayashi, 1996).…”

Section: Female-like Behaviormentioning

confidence: 99%

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Endocrine control of sexual behavior in sneaker males of the peacock blenny Salaria pavo: Effects of castration, aromatase inhibition, testosterone and estradiol

Gonçalves

Alpedrinha

Teles

et al. 2007

Hormones and Behavior

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The effects of castration and sex steroid manipulations on the expression of sexual behavior were investigated in a small fish, the peacock blenny, Salaria pavo. In this species, large males defend nests and attract females while small "sneaker" males reproduce by imitating the female morphology and courtship behavior in order to approach nests during spawning events and parasitically fertilize eggs. Sneakers switch into nest holders in their second breeding season, thus displaying both male and female-like sexual behavior during their lifetime. We tested the effects of castration and of an aromatase inhibitor (Fadrozole, F), testosterone (T) or 17β-estradiol (E 2 ) implants on the expression of male and female-like behavior in sneakers. Sneakers were either sham-operated, castrated or castrated and implanted with vehicle, F, T + F or E 2 + F. Seven days after the treatment, sneakers were placed in a tank with a nesting male, two ripe females and an available nest. Castrated fish had lower levels of circulating T and increased the time spent displaying female typical nuptial coloration. T implants had the opposite effect, inhibiting the expression of femalelike behavior and coloration. E 2 implants had no significant effect on the display of sexual behavior but the frequency of aggressive displays decreased. The results agree with previous findings in sneakers of S. pavo that demonstrated an inhibition of female-like behavior by 11-ketotestosterone (11-KT). The reported increase in T and 11-KT production when sneakers change into nest holders may thus contribute to behaviorally defeminize sneakers. Contrarily, both T and E 2 failed to promote male-like behavior, suggesting that behavioral masculization during tactic switching depends on other neuroendocrine mechanisms or that the time length of the experiment was insufficient to induce male-like behavioral changes in sneakers.

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Section: Nesting Male Behaviorsupporting

confidence: 63%

Section: Female-like Behaviormentioning

confidence: 99%

Endocrine control of sexual behavior in sneaker males of the peacock blenny Salaria pavo: Effects of castration, aromatase inhibition, testosterone and estradiol

Gonçalves

Alpedrinha

Teles

et al. 2007

Hormones and Behavior

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“…The latter increase compares closely with inter-and intrasexual differences in discharge frequency which is 15-20% higher in type I males compared to type II males and females (Bass and Baker, 1990). Comparable testosterone treatments of juvenile males also induce increases in the size of vocal muscles (Brantley et al, 1993b;Lee and Bass, 2005; see Connaughton and Taylor, 1995 for other teleosts) along with vocal motoneuron soma size and aromatase expression levels in the motor nucleus (Bass and Forlano, 2008; the vocal muscle and motor and premotor neurons are dimorphic; Brantley et al, 1993b;Bass et al, 1996).…”

Section: Androgen-dependent Plasticity Of Vocal Cpg Activitymentioning

confidence: 57%

“…Winn and Stout (1960) comment in their field study of satinfin shiners (Notropis analostanus) that 5-10 minutes after receiving a testosterone injection (details not provided), males were more vocal than either non-injected or sesame oil controls. While not a focus of their study, Lee and Bass (2005) note that after 39 day implants of 11-ketotestosterone, a teleost-specific androgen (see below), type II sneaker males did not produce the advertisement hums typical of territorial type I males ( Fig. 2A).…”

Section: Androgen-dependent Plasticity Of Vocal Cpg Activitymentioning

confidence: 96%

“…5, like dihydrotestosterone in tetrapods) that can masculinize secondary sex characters (Oliveira et al, 2005; also see Lee and Bass, 2005 for most recent study of midshipman fish). Both male toadfish and type I male midshipman fish exhibit elevated plasma 11kT levels during vocal advertisement calling compared to non-calling contexts (Knapp et al, 2001;Remage-Healey and Bass, 2005).…”

Section: Androgen-dependent Plasticity Of Vocal Cpg Activitymentioning

confidence: 99%

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Central pattern generators for social vocalization: Androgen-dependent neurophysiological mechanisms

Bass

Remage‐Healey

2008

Hormones and Behavior

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Historically, most studies of vertebrate central pattern generators (CPGs) have focused on mechanisms for locomotion and respiration. Here, we highlight new results for ectothermic vertebrates, namely teleost fish and amphibians, showing how androgenic steroids can influence the temporal patterning of CPGs for social vocalization. Investigations of vocalizing teleosts show how androgens can rapidly (within minutes) modulate the neurophysiological output of the vocal CPG (fictive vocalizations that mimic the temporal properties of natural vocalizations) inclusive of their divergent actions between species, as well as intraspecific differences between male reproductive morphs. Studies of anuran amphibians (frogs) demonstrate that long-term steroid treatments (wks) can masculinize the fictive vocalizations of females, inclusive of its sensitivity to rapid modulation by serotonin. Given the conserved organization of vocal control systems across vertebrate groups, the vocal CPGs of fish and amphibians provide tractable models for identifying androgen-dependent events that are fundamental to the mechanisms of vocal motor patterning. These basic mechanisms can also inform our understanding of the more complex CPGs for vocalization, and social behaviors in general, that have evolved among birds and mammals.

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Alternative Reproductive Tactics in the Centrarchidae

Neff

Knapp

2009

Centrarchid Fishes

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Differential effects of 11-ketotestosterone on dimorphic traits in a teleost with alternative male reproductive morphs

Cited by 29 publications

References 27 publications

Endocrine control of sexual behavior in sneaker males of the peacock blenny Salaria pavo: Effects of castration, aromatase inhibition, testosterone and estradiol

Endocrine control of sexual behavior in sneaker males of the peacock blenny Salaria pavo: Effects of castration, aromatase inhibition, testosterone and estradiol

Central pattern generators for social vocalization: Androgen-dependent neurophysiological mechanisms

Alternative Reproductive Tactics in the Centrarchidae

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