Monogamy and sex change by aggressive dominance in coral reef fish

@article{Fricke1977MonogamyAS,
  title={Monogamy and sex change by aggressive dominance in coral reef fish},
  author={Hans W. Fricke and Simone Fricke},
  journal={Nature},
  year={1977},
  volume={266},
  pages={830-832}
}
IN several sequentially hermaphroditic coral reef fish, of which individuals first function as females and then males (protogynous hermaphroditism), dominant males can control production of other males by aggressive dominance over females1–4. Robertson suggested that socially controlled protogynous sex changes might operate only in species with a well defined polygynous social system “based on individual relationships”2,3. Further exogenous and endogenous factors may control sex change in… 
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References

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Males of Labroides dimidiatus control the process of sex reversal within social groups by actively dominating them and death of the male releases this suppression and the dominant female of the harem changes sex immediately.
Sex change and sexual selection
TLDR
Giselin (2) shifted the focus by suggesting that if members of one sex increase in fertility more rapidly with age than those of the other, then natural selection will favor a genotype whose individuals are all born into the sex that suffers less from being young.
Protogynous Sex Reversal in the Fish Anthias squamipinnis (Teleostei, Anthiidae) regulated by the Presence or Absence of a Male Fish
TLDR
To establish whether environmental factors regulate this sex reversal, or if it is a continuous and non-predictable process, a series of experiments with Anthias performed in captivity during 1968 and 1969 found no change in morphology or behaviour to indicate sex change.