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Related Experiment Videos

Virgin birth in a hammerhead shark.

Demian D Chapman1, Mahmood S Shivji, Ed Louis

  • 1Guy Harvey Research Institute, Oceanographic Centre, Nova Southeastern University, 8000 North Ocean Drive, Dania Beach, FL 33004, USA.

Biology Letters
|May 24, 2007
PubMed
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Parthenogenesis, asexual reproduction, is confirmed in cartilaginous fishes for the first time using a hammerhead shark. This discovery expands knowledge of vertebrate asexual reproduction and its implications for genetic diversity.

Area of Science:

  • Zoology
  • Reproductive Biology
  • Genetics

Background:

  • Parthenogenesis, or asexual reproduction, is known in most vertebrate groups except mammals and cartilaginous fishes.
  • Previous reports of female sharks giving birth without males were attributed to sperm storage.

Purpose of the Study:

  • To provide the first genetic evidence of parthenogenesis in cartilaginous fishes (Chondrichthyes).
  • To investigate asexual reproduction in hammerhead sharks (Sphyrna tiburo).

Main Methods:

  • Genetic analysis of offspring from a captive female hammerhead shark.
  • Comparison of genetic material between mother and offspring.

Main Results:

  • First genetic confirmation of parthenogenesis in a chondrichthyan species.

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  • The observed parthenogenesis was automictic, a known form of asexual reproduction.

    • Conclusions:

    • Parthenogenesis occurs in cartilaginous fishes, challenging previous assumptions.
    • This finding highlights concerns about the impact of facultative parthenogenesis on the genetic diversity of threatened shark populations.