Papers in the Biological Sciences

 

Document Type

Article

Date of this Version

2007

Citation

Published in Biology Letters (August 22, 2007) 3:4, pp. 4 , 425-427. DOI: 10.1098/rsbl.2007.0189

Comments

Copyright © 2007 The Royal Society. Used by permission

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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