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Scientists confirm birth of a virgin shark. Will be crowned king of the Jaws
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Scientists report virgin shark birth POSTED: 1354 GMT (2154 HKT), May 23, 2007 DUBLIN, Ireland (AP) -- Female sharks can fertilize their own eggs and give birth without sperm from males, according to a new study of the asexual reproduction of a hammerhead in a U.S. zoo. The joint Northern Ireland-U.S. research, being published Wednesday in the Royal Society's peer-reviewed Biology Letter journal, analyzed the DNA of a shark born in 2001 in the Henry Doorly Zoo in Omaha, Nebraska. The shark was born in a tank with three potential mothers, none of whom had contact with a male hammerhead for at least three years. The baby was killed within hours of its birth by a stingray in the same tank. Analysis of its DNA found no trace of any chromosomal contribution from a male partner. Shark experts said this was the first confirmed case in a shark of parthenogenesis, which is derived from Greek and means "virgin birth." Asexual reproduction is common in some insect species, rarer in reptiles and fish, and has never been documented in mammals. The list of animals documented as capable of the feat has grown along with the numbers being raised in captivity -- but until now, sharks were not considered a likely candidate. "The findings were really surprising because as far as anyone knew, all sharks reproduced only sexually by a male and female mating, requiring the embryo to get DNA from both parents for full development, just like in mammals," said marine biologist Paulo Prodohl of Queen's University of Belfast, Northern Ireland, a co-author of the report. "As is typical with scientists, we doubted our own results and so we did it again, and then a third time using a new technique with new genetic approaches. This confirmed there was no DNA of any male," said Prodohl, an expert in fish genetics with specific knowledge of hammerhead DNA. Before the study, many shark experts had presumed that the Nebraska birth involved a female shark's well-documented ability to store sperm for months. This seemed the most plausible scenario even though the sharks had arrived at the Nebraska zoo as immature pups. The lack of any paternal DNA in the baby shark ruled out this possibility. "This phenomenon has now been demonstrated in all major vertebrate groups except for mammals. Birds do it, reptiles do it, amphibians do it, fishes do it, and now sharks are known to do it," said Bob Hueter, director of the Center for Shark Research at the Mote Marine Laboratory in Sarasota, Florida, who was not involved in the project. The report's other co-author, Mahmood Shivji of the Guy Harvey Research Institute in Dania Beach, Flordia, said the finding explained growing numbers of anecdotal reports of male-free shark births in captivity. Shivji said the research "may have solved a general mystery about shark reproduction," because it suggests that sharks can "switch from a sexual to a non-sexual mode of reproduction." But he said this was not necessarily a positive ability because baby sharks produced only by the mother suffer from reduced genetic diversity. Genetic diversity makes living creatures better able to adapt to threats, such as disease and climate change. Prodohl said if self-impregnation was occurring in the wild because female sharks cannot find male partners amid rapidly declining shark populations, it would represent "an evolutionary dead end that compromises the survival of the species." He said he suspected this was "already a problem in the real world," and noted the population of blue sharks off the west coast of Ireland had fallen by 90 percent in the past 12 years. But Hueter said he doubted it was happening anywhere besides in captivity. He also argued that the power to self-impregnate represents "an evolutionary strategy to keep the population and species going when all else fails. Genetically, it's a last resort tactic because it leads to genetic uniformity, and eventually that will catch up with the population and make it less fit. "But as a short-term alternative to extinction, it has its benefits," he said. Copyright 2007 The Associated Press. All rights reserved.This material may not be published, broadcast, rewritten, or redistributed. http://edition.cnn.com/2007/TECH/sc...s.ap/index.html |
Re: Scientists confirm birth of a virgin shark. Will be crowned king of the Jaws
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| Originally posted by occrider Gods definetely mad at us when he sends Jesus back as a shark. I blame the gays. |
Re: Re: Scientists confirm birth of a virgin shark. Will be crowned king of the Jaws
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| Originally posted by Jake Benson On the contrary, maybe this is a sign that for the future you won't need the opposite sex to reproduce. Therefore, god loves the gays. |
Hallolujah!
Did you make up the 'King of the Jaws' part?
Because that is funny.
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| Originally posted by Ygrene Did you make up the 'King of the Jaws' part? Because that is funny. |
I'm more impressed that there's a fish geneticist with a specialty in hammerhead sharks.
they are going to have to build one hell of a cross
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| The baby was killed within hours of its birth by a stingray in the same tank. |
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| Originally posted by weymouth Owned! |
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| Originally posted by weymouth Owned! |
lol, so much funny to be had in this thread
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| Originally posted by josh4 Do you just like do a daily search for 'gay' in the COR and jump on the threads that turn up? |
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| Originally posted by Halcyon+On+On No, he just does a search on your name and finds all the gay he could ever need. LAWL OWNED OMFGGGGGGGGGGGBUDWEISER LOOOOOOLOASDLOL!!! |
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| Originally posted by all-nite-freak they are going to have to build one hell of a cross |
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| Originally posted by Halcyon+On+On Quick, somebody make a Steve Irwin joke! |
Damn females, they think they can do everything these days!!
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| Originally posted by josh4 Do you just like do a daily search for 'gay' in the COR and jump on the threads that turn up? |
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| Originally posted by Jake Benson No faggot |
lol @ king of the jaws.
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| Originally posted by MrSquirrel At least they don't need to worry about how they are going to drive in the spikes. |
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| Originally posted by Lilith Not to mention the irony of being a hammerhead. |
man this sucks imagine when mamals evolved there won't be a need for males anymore 
lol THE END IS NEAR!
The Title of this Thread makes me want to riot and send out Fatwas on OCC.... how dare you make fun of this.... blasphemy!!! Heretic!! I want to blame the West and Burn my own house and burn the American flag and oh yeah, and post about how bad it is to be an American Hammer Head Shark going to University and then post pics of new room mate and then realize that the fat Latino was right about how immature I was and then try to edit my earlier posts and then get mad at the fat Latino for pointing out that how wrong it is to have a Mod fix another posters post and then act like nothing happened and I am so right ...... oh its the wrong religion 
off my bitch mode now.....
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