锤头鲨的单性生殖。
Virgin birth in a hammerhead shark.
作者信息
Chapman Demian D, Shivji Mahmood S, Louis Ed, Sommer Julie, Fletcher Hugh, Prodöhl Paulo A
机构信息
Guy Harvey Research Institute, Oceanographic Centre, Nova Southeastern University, 8000 North Ocean Drive, Dania Beach, FL 33004, USA.
出版信息
Biol Lett. 2007 Aug 22;3(4):425-7. doi: 10.1098/rsbl.2007.0189.
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.
摘要
单性生殖现象在除哺乳动物和软骨鱼类（软骨鱼纲：鲨鱼、鳐鱼和银鲛）之外的所有主要有颌脊椎动物谱系中都有记录。尽管长期处于没有雄性的环境中，但圈养的雌性鲨鱼仍能产仔，此类报道通常被归因于先前的交配以及雌性鲨鱼的长期精子储存。在此，我们提供了软骨鱼类单性生殖的首个遗传学证据，该证据涉及一条锤头鲨（窄头双髻鲨）。这一发现还拓宽了脊椎动物中已知的特定类型无性发育（自动孤雌生殖）的范围，加剧了人们最近对这种兼性单性生殖可能对濒危脊椎动物物种遗传多样性产生负面影响的担忧。
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