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Virgin birth in a hammerhead shark
Chapman, D.D.F.; Shivji, M.S.; Louis, E.; Sommer, J.; Fletcher, H.; Prodöhl, P.A. (2007). Virgin birth in a hammerhead shark. Biol. Lett. 3(4): 425-427. dx.doi.org/10.1098/rsbl.2007.0189
In: Biology Letters. Royal Society Publishing: London. ISSN 1744-9561, more
Peer reviewed article  

Available in Authors 

Keywords
    Asexual reproduction; Parthenogenesis; Sphyrnidae Bonaparte, 1840 [WoRMS]; Marine

Authors  Top 
  • Chapman, D.D.F.
  • Shivji, M.S.
  • Louis, E.
  • Sommer, J.
  • Fletcher, H.
  • Prodöhl, P.A.

Abstract
    Parthenogenesis has been documented in all major jawed vertebrate lineages except mammals and cartilaginous fishes (class Chondrichthyes: sharks, batoids and chimeras). Reports of captive female sharks giving birth despite being held in the extended absence of males have generally been ascribed to prior matings coupled with long-term sperm storage by the females. Here, we provide the first genetic evidence for chondrichthyan parthenogenesis, involving a hammerhead shark (Sphyrna tiburo). This finding also broadens the known occurrence of a specific type of asexual development (automictic parthenogenesis) among vertebrates, extending recently raised concerns about the potential negative effect of this type of facultative parthenogenesis on the genetic diversity of threatened vertebrate species.

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