Social control of sex reversal in a coral-reef fish in Berkeley

Smith Contr Zool — Fishelson, L. The lantern bass, Serranus baldwiniis a small hermaphroditic serranid found adjacent to coral reefs throughout the Caribbean.

Maynard Smith J. This hypothesis is called the low-density model for the evolution of simultaneous hermaphroditism 1. Whether the females disappeared before the males changed sex is unknown because the sex changes occurred during a six month non-observation period. Bidirectional sex change has also been observed in monogamous gobies that inhabit branching corals 91322 In low-density populations, such immigration of females and juveniles cannot be expected, although immigration of other widowed males could be expected.

The evolution of hermaphroditism and unisexuality in aquatic and terrestrial vertebrates.

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J Exp Biolpt 2326 Nov Robert R. If a male-male pair formed after the movement of the widowed males, we observed courtship and spawning behaviour at the expected spawning time, usually after high tide 19 Bidirectional sex change has also been observed in monogamous gobies that inhabit branching corals 91322 Serial female sex changes after simultaneous removal of males from social groups of a coral reef fish.

In: B. If a fish can pass the mark test, what are the implications for consciousness and self-awareness testing in animals?

  • Ghiselin's size-advantage hypothesis has been used with considerable success to explain the adaptive significance of sequential hermaphroditism in fishes. If the expected number of offspring produced differs between the sexes with size, then an individual that changes sex can take advantage of these differences and have more offspring than an individual that remains exclusively male or female.
  • Hermaphroditism is ubiquitous among plants and widespread in the animal kingdom. It is an unsolved problem why reversed sex change has evolved in polygynous and protogynous reef fish.
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Princeton University Press, Princeton. The costs of changing sex and the ontogeny of males under contest competition for mates. Policansky D Sex change in plants and animals. Sex change and the size-advantage model.

Social control of sex reversal in a coral-reef fish in Berkeley

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