Histology, ultrastructure, and in vitro steroidogenesis of the testes of two male phenotypes of the protogynous fish, Thalassoma duperrey (labridae)

Hourigan, Thomas F.; Nakamura, Masaru; Nagahama, Yoshitaka; Yamauchi, Kazuyo; Grau, E. Gordon

doi:10.1016/0016-6480(91)90023-y

Cited by 79 publications

(55 citation statements)

References 29 publications

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“…Bourgeois nest males in our study indeed had significantly higher levels of free 11-KT than plastic sneaker males, which may be associated with the clear differences in social dominance and reproductive activities between these male types, as shown in a previous study (von Kuerthy and Taborsky, 2016). This pattern of elevated free 11-KT levels in bourgeois nest males compared with opportunistic sneaker males is consistent with results from previous studies of teleosts with ARTs, such as the bluegill sunfish (Kindler et al, 1989;Knapp and Neff, 2007), peacock blenny (Oliveira et al, 2001b), Azorean rock-pool blenny (Oliveira et al, 2001c), and saddleback wrasse (Hourigan et al, 1991). We would expect that previous sneaker males in L. callipterus that have switched from sneaker to nest male status exhibit similar free 11-KT levels as the nest males studied here, because the sneaker male tactic is a transient stage leading to the final bourgeois phase provided that individuals survive to this stage.…”

Section: Discussionsupporting

confidence: 90%

Androgen responses to reproductive competition of males pursuing either fixed or plastic alternative reproductive tactics

Kuerthy

Ros

Taborsky

2016

Journal of Experimental Biology

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Alternative reproductive tactics (ARTs), which can be plastic or fixed for life, may be characterized by distinct hormonal profiles. The relative plasticity hypothesis predicts flexible androgen regulation for adult males pursuing plastic tactics, but a less flexible regulation for males using a fixed tactic throughout life. Furthermore, androgen profiles may respond to changes in the social environment, as predicted by the social reciprocity models of hormone/behaviour interactions. The cichlid fish Lamprologus callipterus provides a rare opportunity to study the roles of androgens for male ARTs within a single species, because fixed and plastic ARTs coexist. We experimentally exposed males to competitors pursuing either the same or different tactics to test predictions of the relative plasticity and the social reciprocity models. Androgen profiles of different male types partly comply with predictions derived from the relative plasticity hypothesis: males of the plastic bourgeois/sneaker male trajectory showed different 11-ketotestosterone (11-KT) levels when pursuing either bourgeois or parasitic sneaker male behaviours. Surprisingly, males pursuing the fixed dwarf male tactic showed the highest free and conjugated 11-KT and testosterone (T) levels. Our experimental social challenges significantly affected the free 11-KT levels of bourgeois males, but the androgen responses did not differ between challenges involving different types of competitors. Furthermore, the free T-responses of the bourgeois males correlated with their aggressive behaviour exhibited against competitors. Our results provide new insights into the endocrine responsiveness of fixed and plastic ARTs, confirming and refuting some predictions of both the relative plasticity and the social reciprocity models.

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Section: Discussionsupporting

confidence: 90%

Androgen responses to reproductive competition of males pursuing either fixed or plastic alternative reproductive tactics

Kuerthy

Ros

Taborsky

2016

Journal of Experimental Biology

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“…Individuals of this species mature initially as either males or females. Under appropriate social conditions, initial phase (IP) males and females become terminal phase (TP) males (Hourigan et al 1991;Kuwamura et al 2000). Ovaries of the female, which initially have no detectable testicular tissue, are restructured into fully functional testes during sex change (Hourigan et al 1991).…”

Section: Introductionmentioning

confidence: 99%

Histological observation of doublesex-mab 3-related transcription factor 1 (DMRT1) localization in the adult testis of three-spot wrasse

et al. 2014

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Doublesex-mab 3-related transcription factor 1 (DMRT1) has been identified as the first conserved gene involved in the testicular differentiation of vertebrates. However, the precise role of DMRT1 in spermatogenesis has not been made clear. In this study, immunohistochemical method was used to observe DMRT1 protein localization in order to resolve cellular profile of DMRT1 in the adult testis of three-spot wrasse. DMRT1 protein was clearly and specifically localized in the Sertoli cells of all spermatogenic cells and epithelial cells comprising the efferent duct, but not in the germ cells. In addition, adult males were treated with aromatase inhibitor (AI) for investigating the role of estrogen on the transcription of DMRT1. AI treatment caused an increase in the levels of DMRT1 transcripts in the efferent duct region, concomitant with a decrease in spermatogonia and spermatocytes.Keywords DMRT1 Á Spermatogenesis Á Efferent duct Á Wrasse Á Aromatase inhibitor Á Sertoli cell Abbreviations DMRT1 Doublesex-mab 3-related transcription factor 1 E2

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“…The onset of sex change is characterized by a rapid decline in GSI and low serum E2 levels (Nakamura et al ., 1989). As these parameters may also vary with the ovarian cycle and season (Hourigan et al ., 1991;Hoffman, 1987), gonadal histology was utilized to confirm the progression of sex change. Based on all criteria, the predicted sex changer from the small TP male treatment had no evidence indicating sex change.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to several changes in behavioral and secondary sexual characteristics, the gonad is significantly restructured. The testes of IP males become significantly smaller with numerous, large Leydig cells (Hourigan et al ., 1991). Ovaries, which have no detectable testicular tissue prior to sex change, develop into fully functional testes.…”

Section: Introductionmentioning

confidence: 99%

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Terminal Phase Males Stimulate Ovarian Function and Inhibit Sex Change in the Protogynous Wrasse Thalassoma duperrey

Morrey

Nagahama

Grau³

2002

Zoological Science

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Histology, ultrastructure, and in vitro steroidogenesis of the testes of two male phenotypes of the protogynous fish, Thalassoma duperrey (labridae)

Cited by 79 publications

References 29 publications

Androgen responses to reproductive competition of males pursuing either fixed or plastic alternative reproductive tactics

Androgen responses to reproductive competition of males pursuing either fixed or plastic alternative reproductive tactics

Histological observation of doublesex-mab 3-related transcription factor 1 (DMRT1) localization in the adult testis of three-spot wrasse

Terminal Phase Males Stimulate Ovarian Function and Inhibit Sex Change in the Protogynous Wrasse Thalassoma duperrey

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