Evolutionary and demographic impacts of sex change rules and size-selective exploitation on sequential hermaphrodites
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Evolutionary and demographic impacts of sex change rules and size-selective exploitation on sequential hermaphrodites

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Details:

  • Journal Title:
    ICES Journal of Marine Science
  • Personal Author:
  • NOAA Program & Office:
    NMFS (National Marine Fisheries Service)
  • Description:
    Relatively few studies have addressed fishery-induced-evolution of sequential hermaphrodites although declines in the mean size-at-maturation and/or sex change have been documented for several species. We sought to explore the evolutionary impacts of size-selective exploitation on maturation and sex change of a protogynous hermaphrodite using an individual-based model accounting for growth, survival, maturation, sex change, and reproduction. Because sex change rules are unknown for many exploited species, critical size-at-sex change (static and genetic control) and social control of sex change were evaluated to determine how life-history-traits (maturation, sex change) and population reference points change due in part to evolution. When simulating critical size-at-sex change, mean length-at-maturation increased, contrary to typical predictions for dioecious species, and mean length-at-sex change decreased (when under genetic control) from exploitation. These changes occurred slowly and resulted in lower male: female sex ratios, sperm limitation, and extirpation at high exploitation rates. Under social control of sex change, both the mean lengths-at-maturation and sex change decreased relatively rapidly from exploitation. These populations maintained high male: female sex ratios, avoided sperm limitation, and withstood higher exploitation rates than critical size-at-sex change populations. Results from these models highlight the need for a better understanding of sex change rules for exploited hermaphrodites.
  • Keywords:
  • Source:
    ICES Journal of Marine Science (2019)
  • DOI:
  • ISSN:
    1054-3139;1095-9289;
  • Format:
    PDF
  • Publisher:
    Oxford University Press (OUP)
  • Document Type:
    Journal Article
  • Funding:
    Grant no. NA11NMF4550121
  • Rights Information:
    Other
  • Compliance:
    Library
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