#parthénogenèse

Largest-ever study of artificial insemination in sharks—and the occasional ’virgin birth’
▻https://phys.org/news/2021-05-largest-ever-artificial-insemination-sharksand-occasional.html

In the genetic analysis of the offspring, the team also found two instances of parthenogenesis, where the mother reproduced on her own without using the sperm she’d been inseminated with. “These cases of parthenogenesis were unexpected and help illustrate how little we know about the basic mechanisms of sexual reproduction and embryo development among sharks,” says Wyffels

#parthénogénèse

Savage tick-clone armies are sucking cows to death; experts fear for humans
▻https://arstechnica.com/science/2019/07/savage-tick-clone-armies-are-sucking-cows-to-death-experts-fear-for-hum

Ravenous swarms of cloned ticks have killed a fifth cow in North Carolina by exsanguination—that is, by draining it of blood—the state’s Department of Agriculture and Consumer Services warned this week.

Experts fear that the bloodthirsty throngs, which were first noticed in the United States in 2017, will continue their rampage, siphoning life out of animals and eventually transmitting diseases, potentially deadly ones, to humans.

[...]

The tick—the Asian longhorned tick, or Haemaphysalis longicornis—was first found terrorizing a sheep in New Jersey in 2017 and has established local populations in at least 10 states since it sneaked in. Its invasive sweep is due in large part to the fact that a single well-fed female can spawn up to 2,000 tick clones parthenogenetically—that is, without mating—in a matter of weeks. And unlike other ticks that tend to feast on a victim for no more than seven days, mobs of H. longicorni can latch on for up to 19 days.

#tiques #États-Unis #it_has_begun #parthénogenèse