Tuesday, June 2, 2015 | 1:32 pm
Some females of a population of sawfish in Florida (USA) have begun to reproduce without sex, the first case of parthenogenesis (virgin birth) of vertebrates in their habitat it is known, according to a study published in the journal Cell Press.
parthenogenesis is a common phenomenon in animals invertebrates but rare in the vertebrates , among which, until now, he had only given captive situations in which they can not mate.
This discovery, while scientists from the Stony Brook University New York carried out a routine investigation into the genetics of small tooth sawfish, arrived unexpectedly a kind at high risk of extinction. Analyses of DNA revealed that about 3 percent of the fish studied were the result of this unusual form of reproduction.
The discovery suggests that these births can be a natural response to decreasing their number, rather than an abnormality usually seen in captivity. In the case of sawfish small tooth (Pristis pectinata) is a species in extreme danger of extinction, with a population that has been decimated to less than 5% of its size in 1900.
The parthenogenesis could prolong the existence of sawfish, but not enough to save them, the researchers said. . Also, scientists believe that the parthenogenesis may be more widespread in the animal world than we think
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