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<p>Hypersaline water bodies represent one of the most extreme habitats, in which only a limited number of species can survive. <i>Artemia</i> has well adapted to living in such conditions, in part due to its ability to produce dormant eggs that exhibit the highest resistance to salt among animals. To assess the biological traits of <i>Artemia</i> and the environmental factors influencing the switch between ovoviviparity and oviparity, we conducted long-term studies of a parthenogenetic <i>Artemia</i> lineage in Lake Bolshoye Yarovoye (Western Siberia). Morphometric analyses revealed that the proportion of oviviparous females within <i>Artemia</i> lineage increased with female length, both in the first and in subsequent generations. Changes in the proportion of oviviparous females also exhibited seasonal trends, increasing during the growing season and reaching a maximum in autumn. While variation in trophic conditions did not alter the reproductive shift between oviviparity and oviparity, it significantly influenced brood size. Our findings indicate that the dominant reproductive mode in <i>Artemia</i> is influenced not only by environmental conditions but also by the size-age structure of the community.</p>

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Drivers of reproductive strategy in parthenogenetic Artemia lineage: a long-term study from Western Siberia

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • L. V. Yanygina,
  • G. A. Tsareva

摘要

Hypersaline water bodies represent one of the most extreme habitats, in which only a limited number of species can survive. Artemia has well adapted to living in such conditions, in part due to its ability to produce dormant eggs that exhibit the highest resistance to salt among animals. To assess the biological traits of Artemia and the environmental factors influencing the switch between ovoviviparity and oviparity, we conducted long-term studies of a parthenogenetic Artemia lineage in Lake Bolshoye Yarovoye (Western Siberia). Morphometric analyses revealed that the proportion of oviviparous females within Artemia lineage increased with female length, both in the first and in subsequent generations. Changes in the proportion of oviviparous females also exhibited seasonal trends, increasing during the growing season and reaching a maximum in autumn. While variation in trophic conditions did not alter the reproductive shift between oviviparity and oviparity, it significantly influenced brood size. Our findings indicate that the dominant reproductive mode in Artemia is influenced not only by environmental conditions but also by the size-age structure of the community.