Multiple Simultaneous Sex Changes in Social Groups of a Coral-Reef Fish

Ross, Robert M.; Lutnesky, Marvin M. F.; Singh, Ishwar

doi:10.2307/1446348

Cited by 31 publications

(13 citation statements)

References 13 publications

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“…The multiply triggered sex changes observed in this fish suggest sex change by size-ratio rather than sex-ratio induction. Size-ratio induction has been verified experimentally (Ross et al 1990). Both sex-ratio induction and size-ratio induction were described as 'behavioral induction' by Shapiro (1984), though the role of behavior in the sex-change mechanism of T. duperrey remains undetermined (Ross et al 1983).…”

Section: Sex-change Inductionmentioning

confidence: 91%

“…In one type of induction studied in detail, group size and group sex ratio may be the proximate determinants of sex change (Shapiro 1979(Shapiro , 1980. In another type, sex-change stimulation or inhibition depends on relative-size ratios within the social unit (Ross et al 1983(Ross et al , 1990. The former (sexratio induction) occurs in a monandric, sexually dimorphic species and the latter (size-ratio induction) in a species that is diandric and sexually monomorphic over half the adult size range.…”

Section: Sex-change Inductionmentioning

confidence: 99%

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The evolution of sex-change mechanisms in fishes

Ross¹

1990

Environ Biol Fish

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148

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Section: Sex-change Inductionmentioning

confidence: 91%

Section: Sex-change Inductionmentioning

confidence: 99%

The evolution of sex-change mechanisms in fishes

Ross¹

1990

Environ Biol Fish

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148

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“…Females thus identified were placed in submerged pens constructed of 12.7 mm 2 wire mesh with approximate dimensions of 1 m 3 . Females induced to change sex after 9 weeks in these pens (Ross et al, 1990) were used as secondary males (SM: n = 2; standard length 90 and 101 mm) for this study. The probability of sex change in females of this fish is a function of their relative size in the social group (Ross et al, 1990).…”

Section: Ultrastructurementioning

confidence: 99%

Immunocytochemical and Ultrastructural Identification of Pituitary Cell Types in the Protogynous Thalassoma duperrey during Adult Sexual Ontogeny

et al. 1998

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Protogynous wrasses (Thalassoma duperrey): females (F), primary males (PM) along with a few terminal-phase males (TM) and sex-changed males (SM), were used to characterize the topographical organization of the pituitary. In general, immunocytochemical and ultrastructural features of the adenohypophyseal cell types of the saddleback wrasse pituitary resemble those of other teleosts. In the rostral pars distalis (RPD), corticotropic cells were found bordering the neurohypophysis (NH) and surrounding the centroventrally located prolactin cells. Thyrotropic cells formed a small group in the anteriodorsal part of the rostral and proximal pars distalis (PPD). The somatotropic cells were distributed in large clusters, mostly organized in cell cords around the interdigitations of the NH of the dorsal PPD. Cells containing gonadotropin Ib subunit were localized in the dorsal parts of the PPD, in close association with somatotropic cells and gonadotropin IIb subunit containing cells were seen in the centroventral parts of the PPD and along the periphery of the pars intermedia (PI). The pars intermedia was composed of melanotropic cells and somatolactin cells that lined the neurohypohysis.Distinct ultrastructural differences in corticotropic and somatotropic cells were not observed between the four groups. In all groups, prolactin cells in the ventral-most RPD could be immature cells or actively secreting prolactin. Gonadotropic II cells of PM and F had relatively higher incidence of "nuclear budding" and cell organelles compared to TM and SM. Besides gonadotropic, the active melanotropic and somatolactin cells might be associated with some aspect(s) of reproduction.

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“…Ross et al (1983) provide evidence that both size of fish as well as sex ratio can influence sex reversal in some labrids. Multiple sex changes may occur simultaneously in some populations (as opposed to the one to one replacement of harem forming species) (Ross et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

The influence of increased line‐fishing mortality on the sex ratio and age of sex reversal of the venus tusk fish

Platten¹,

Tibbetts

Sheaves

2002

Journal of Fish Biology

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The age of sex reversal of the venus tusk fish Choerodon venustus, caught by line fishing at various locations on the southern Great Barrier Reef, indicated that C. venustus is capable of modifying its life cycle in response to increased mortality. The evidence suggests Masthead Reef fish, which experience the highest mortality, underwent sex reversal at a smaller size and younger age than at the other sites. The largest female fish, sexually transitional fish and males were smaller at Masthead Reef than at the Swains Reefs or One Tree Reef at Masthead Reef. There was also considerable overlap in the size of males and females within the exploited populations indicating that sex reversal is not initiated at a particular length but may have a social cause. The sex ratio of fish was essentially the same for fish fully susceptible to line fishing in the Swains and Masthead samples. Circumstantial evidence suggested that the absence of large males in a population may initiate sex reversal, indicating the maintenance of a constant sex ratio may have a social basis.

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Multiple Simultaneous Sex Changes in Social Groups of a Coral-Reef Fish

Cited by 31 publications

References 13 publications

The evolution of sex-change mechanisms in fishes

The evolution of sex-change mechanisms in fishes

Immunocytochemical and Ultrastructural Identification of Pituitary Cell Types in the Protogynous Thalassoma duperrey during Adult Sexual Ontogeny

The influence of increased line‐fishing mortality on the sex ratio and age of sex reversal of the venus tusk fish

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