Female Shark Learns To Reproduce Without Males After Years Alone (newscientist.com)

An anonymous reader quotes a report from New Scientist: A female shark separated from her long-term mate has developed the ability to have babies on her own. Leonie the zebra shark (Stegostoma fasciatum) met her male partner at an aquarium in Townsville, Australia, in 1999. They had more than two dozen offspring together before he was moved to another tank in 2012. From then on, Leonie did not have any male contact. But in early 2016, she had three baby sharks. Intrigued, Christine Dudgeon at the University of Queensland in Brisbane, Australia, and her colleagues began fishing for answers. One possibility was that Leonie had been storing sperm from her ex and using it to fertilize her eggs. But genetic testing showed that the babies only carried DNA from their mum, indicating they had been conceived via asexual reproduction. Some vertebrate species have the ability to reproduce asexually even though they normally reproduce sexually. These include certain sharks, turkeys, Komodo dragons, snakes and rays. However, most reports have been in females who have never had male partners. In sharks, asexual reproduction can occur when a female's egg is fertilized by an adjacent cell known as a polar body, Dudgeon says. This also contains the female's genetic material, leading to "extreme inbreeding", she says. "It's not a strategy for surviving many generations because it reduces genetic diversity and adaptability." Nevertheless, it may be necessary at times when males are scarce. "It might be a holding-on mechanism," Dudgeon says. "Mum's genes get passed down from female to female until there are males available to mate with." It's possible that the switch from sexual to asexual reproduction is not that unusual; we just haven't known to look for it, Dudgeon says.

Comments

Re:Human females are going to have to do the same

[Ol Olsoc]

Because it is so dangerous for a man to get married and have children due to unfair family law. MGTOW. Look it up

While MGTOW is a little interesting, way too much of it is butthurt whining. But the point is taken that an increasing number of men who would make good mates for a woman have done a risk/benefit analysis, and decided that it is not worth it.

And that is kind of a problem. It's a passive avoidance, it isn't illegal. It's like avoiding smoking by not smoking. And as VR and "sex dolls" become more realistic, will only become worse.

What is worse, while stable prudent men decide to pursue their careers and keep their assets, and avoid relationships with females, the jerks and abusers won't change at all.