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<p>In elasmobranchs, polyandry resulting in multiple paternity is widespread, though more frequently studied in viviparous than oviparous species. Because mating system studies improve understanding of species’ resilience and population dynamics, we examined multiple paternity using SNP analysis in the oviparous skate <i>Sympterygia acuta</i>, endemic to the coastal waters of the Southwestern Atlantic. Under controlled aquarium conditions, three clutches from different females maintained both in the absence and presence of males were analysed, considering that elasmobranch females can store sperm and that sperm storage has been previously suggested for this species. Multiple paternity was confirmed in at least two litters of <i>S. acuta</i> using three analytical approaches (CERVUS, COLONY, and COANCESTRY). In two litters, pairs of egg cases laid simultaneously were fertilized by different males; the next pair by the same male and the following pair by different males. This fertilization pattern may indicate that females store sperm from a male in only one oviducal gland or use each gland independently. Sire skew was also observed in at least one clutch. As the first report for the Arhynchobatidae family and only the third study assessing multiple paternity in an oviparous elasmobranch, these findings enhance our understanding of reproductive strategies and mating systems in elasmobranchs.</p>

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First records of multiple paternity in the softnose skates, family Arhynchobatidae: Sympterygia acuta as a case study

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Victoria M. Lenain,
  • Cynthia A. Awruch,
  • Santiago G. Ceballos,
  • Christine Dudgeon,
  • Valeria Gabbanelli,
  • Florencia Matusevich,
  • Ezequiel Mabragaña

摘要

In elasmobranchs, polyandry resulting in multiple paternity is widespread, though more frequently studied in viviparous than oviparous species. Because mating system studies improve understanding of species’ resilience and population dynamics, we examined multiple paternity using SNP analysis in the oviparous skate Sympterygia acuta, endemic to the coastal waters of the Southwestern Atlantic. Under controlled aquarium conditions, three clutches from different females maintained both in the absence and presence of males were analysed, considering that elasmobranch females can store sperm and that sperm storage has been previously suggested for this species. Multiple paternity was confirmed in at least two litters of S. acuta using three analytical approaches (CERVUS, COLONY, and COANCESTRY). In two litters, pairs of egg cases laid simultaneously were fertilized by different males; the next pair by the same male and the following pair by different males. This fertilization pattern may indicate that females store sperm from a male in only one oviducal gland or use each gland independently. Sire skew was also observed in at least one clutch. As the first report for the Arhynchobatidae family and only the third study assessing multiple paternity in an oviparous elasmobranch, these findings enhance our understanding of reproductive strategies and mating systems in elasmobranchs.