Sex-role reversal in vertebrates: behavioural and endocrinological accounts

@article{Eens2000SexroleRI,
  title={Sex-role reversal in vertebrates: behavioural and endocrinological accounts},
  author={Marcel Eens and Rianne Pinxten},
  journal={Behavioural Processes},
  year={2000},
  volume={51},
  pages={135-147}
}
  • M. Eens, R. Pinxten
  • Published 5 October 2000
  • Biology, Psychology, Environmental Science
  • Behavioural Processes
View on Elsevier
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References

SHOWING 1-10 OF 83 REFERENCES

Prospects for Sex Role Reversal in Teleost Fishes

TLDR
This reproductive rates approach should reveal more examples of sex role reversal in teleosts and could contribute to the development of hitherto largely unformulated generalisations about sex differences inteleost fishes.

Sex Roles Are Not Always Reversed When the Potential Reproductive Rate Is Higher in Females

  • N. Okuda
  • Biology, Psychology
    The American Naturalist
  • 1999
TLDR
The facts that the variance in reproductive success was greater in males and the males developed a sexual trait suggest that sexual selection is acting more strongly on males than on females, suggesting that this fish is not sex‐role reversed.

The Bateman gradient and the cause of sexual selection in a sex–role–reversed pipefish

TLDR
It is shown that, in the male–pregnant pipefish Syngnathus typhle, females exhibit a stronger positive association between number of mates and fertility than do males and that this relationship responds in the predicted fashion to changes in the adult sex ratio.

Operational Sex Ratios in Seahorses

TLDR
A study of a laboratory population of the Sri Lankan seahorse Hippocampus fuscus finds that the operational sex ratio (OSR) among mated seahorses is male-biased, because unmated (empty) males can prepare to mate more quickly and can remain ready to mate for longer than can unmated females.

Sex-Role Reversal in the Black-Chinned Tilapia, Sarotherodon Melanotheron (RÜPpel) (Cichlidae)

TLDR
The prediction of sex role reversal (competitive females and discriminating males) is confirmed by examining competition for mates and mate choice in the black-chinned tilapia, Sarotherodon melanotheron, a paternal mouth brooding cichlid.

Shield Characteristics Are Testosterone-Dependent in Both Male and Female Moorhens

TLDR
In the moorhen, moorhens implanted with testosterone had higher intensities of ectoparasite infestations than control birds, but other indirect measures of immunocompetence did not differ significantly between the two categories of birds.

Seahorses exhibit conventional sex roles in mating competition, despite male pregnancy

TLDR
The laboratory experiments in this paper demonstrate that, contrary to expectations, seahorses exhibit conventional sex roles: male seahorse compete more intensely than females for access to mates, on both the first and final days of courtship.

Sexual selection and the potential reproductive rates of males and females

TLDR
It is shown that among species where males care for the young, the sex with the higher potential reproductive rate competes more intensely for mates than thesex with the lower potential rate of reproduction.

Plasma steroid hormones in relation to behavioral sex role reversal in the spotted sandpiper, Actitis macularia.

TLDR
The results indicate that the high level of intrasexual competition for mates among female spotted sandpipers is not based upon a total reversal of the normal male/female levels of androgens and estradiol.

Courting females: ecological constraints affect sex roles in a natural population of the blenniid fish Salaria pavo

TLDR
Evidence for ecological modulation of sex roles in a natural population of the blenniid fish Salaria pavo (Risso) is presented, where nest sites are very scarce, courtship is almost entirely initiated by females, and both male and female intra-sexual competition occurs.
...