Sex ratio variation in the intertidal isopod, Jaera albifrons

SB Piertney, GR Carvalho

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Abstract

Thirty 'rock-populations' of the intertidal isopod, Jaera albifrons (Isopoda: Asellota), from South Wales area were found to display a significant and persistent sex ratio bias, with females outnumbering males by up to 12 to 1. This thelygeny was not mirrored in broods that were isolated in aquaria after insemination, nor in broods that developed under various temperature and light regimes. Such a discrepancy suggests that the mechanism generating sex ratio biases in natural populations is not innate, nor is influenced by cytoplasmic or environmental factors. The possible causes of thelygeny in natural populations are discussed.

Original languageEnglish
Pages (from-to)825-828
Number of pages4
JournalJournal of the Marine Biological Association of the United Kingdom
Volume76
Issue number3
Publication statusPublished - Aug 1996

Keywords

  • MICROGEOGRAPHIC GENETIC DIFFERENTIATION
  • LEACH

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