Clipmarks | Sharks Clips

Second case of virgin birth found in sharks

Sat, 11 Oct 2008 17:11:48 GMT

clipped by: willhelm

Scientists have confirmed the second case of a "virgin birth" in a shark.

In a study reported Friday in the Journal of Fish Biology, scientists said DNA testing proved that a pup carried by a female blacktip shark in a Virginia aquarium contained no genetic material from a male.

The first documented case of asexual reproduction, or parthenogenesis, among sharks involved a pup born to a hammerhead at an Omaha, Neb., zoo.

Scientists confirm shark's ‘virgin birth’

Sat, 11 Oct 2008 10:29:18 GMT

clipped by: tabsey
clipper's remarks: Interesting anti-extinction ability.

Clip Source: www.msnbc.msn.com

RICHMOND, Va. - Scientists have confirmed the second case of a "virgin birth" in a shark.

In a study reported Friday in the Journal of Fish Biology, scientists said DNA testing proved that a pup carried by a female Atlantic blacktip shark in the Virginia Aquarium & Marine Science Center contained no genetic material from a male.

The first documented case of asexual reproduction, or parthenogenesis, among sharks involved a pup born to a hammerhead at an Omaha, Neb., zoo.

"This first case was no fluke," Demian Chapman, a shark scientist and lead author of the second study, said in a statement. "It is quite possible that this is something female sharks of many species can do on occasion."

The aquarium sharks that reproduced without mates each carried only one pup, while some shark species can produce litters numbering in the dozen or more. The scientists cautioned that the rare asexual births should not be viewed as a possible solution to declining global shark populations.

Tags: nature

NOT Science Fiction

Sat, 11 Oct 2008 08:10:37 GMT

clipped by: AainaA
clipper's remarks: Virgin birth confirmed second case in Sharks

Clip Source: www.aainaa.info

Of Virgin-Birth

“It is now clear that parthenogenesis occurs in sharks other than just hammerheads,” Chapman said. “The first case was no fluke. It is quite possible that this is something female sharks of many species can do on occasion.”

Scientists have confirmed the second-ever case of a “virgin birth” in a shark, indicating once again that female sharks can reproduce without mating and raising the possibility that many female sharks have this incredible capacity. This compelling new study will be published today in the latest issue of the Journal of Fish Biology, a leading international journal.

The new paper is entitled “Parthenogenesis in a large-bodied requiem shark, the blacktip Carcharhinus limbatus.” Tidbit was an Atlantic blacktip shark whom Virginia Aquarium biologists believe had only just reached sexual maturity.

Tags: birth, chapman, demian, discovery, dna, education, mahmood, parthenogenesis

'Virgin Birth' By Shark Confirmed: Second Case Ever

Sat, 11 Oct 2008 00:27:54 GMT

clipped by: invictus
clipper's remarks: The "Jaws Messiah"?

Clip Source: www.sciencedaily.com

ScienceDaily (Oct. 10, 2008) — Scientists have confirmed the second-ever case of a “virgin birth” in a shark, indicating once again that female sharks can reproduce without mating and raising the possibility that many female sharks have this incredible capacity.

Tags: biology, genetics, marine life, sharks, virgin birth, science

Vigrin Birth

Fri, 10 Oct 2008 21:53:50 GMT

clipped by: balthazarus
clipper's remarks: Very intriguing.

Clip Source: www.latimes.com

Scientists: DNA testing proves Virginia shark's pup a 'virgin birth'; 2nd case ever confirmed

scientists said DNA testing proved that a pup carried by a female Atlantic blacktip shark in the Virginia Aquarium & Marine Science Center contained no genetic material from a male.

The scientists cautioned that the rare asexual births should not be viewed as a possible solution to declining global shark populations.

Virgin birth has been proven in some bony fish, amphibians, reptiles and birds, and has been suspected among sharks in the wild. The scientists who studied the Virginia and Nebraska sharks said the newly formed pups acquired one set of chromosomes when the mother's chromosomes split during egg development, then united anew.

"It is very unlikely that a small number of female survivors could build their numbers up very quickly by undergoing virgin birth," Chapman said

their findings offer "intriguing questions" about how frequently automictic parthenogenesis occurs in the wild

Tags: sharks, birth, stress

Real Life Jaws

Fri, 10 Oct 2008 20:26:36 GMT

clipped by: randyvild
clipper's remarks: Was this shark a Hollywood actor?

Clip Source: popularemails.com

"Real Life Jaws"

OCEAN SHORES, WA

While the ocean vessel 'Dawn Raider' was commercial fishing for dogfish,
this Great White was hooked in the mouth but only resisted slightly for 15 minutes
before it came up alongside the boat to have a look; long enough for one of the crew members to slip a rope
around it's tail!!! 'And that's when the s**t hit the fan!!. The Shark took off towing the 42 foot fishing boat backwards
through the water at about 7 Knots. Just like in JAWS, the boat was taking on water over the stern
and the crew watched in horror as the shark would actually jump completely out of the water at times.
This went on for an hour before the shark finally drowned.

She weighed in at 1035 LBS. It is suspected she followed a weak El Nino current into local waters
in search of food. Although mid 60 deg. water is considered ideal for these sharks,
the larger ones can tolerate water in the low 50s.

Tags: shark, jaws, ocean, great white, attack

DNA test proves it--baby shark has no father

Fri, 10 Oct 2008 19:41:23 GMT

clipped by: LisbethJ
clipper's remarks: This is wild!

Clip Source: www.cnn.com

updated 2:52 a.m. EDT, Fri October 10, 2008

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DNA test proves it -- baby shark has no father

Story Highlights
Pup carried by a female blacktip shark contains no male genetic material
Scientist: "This is something female sharks of many species can do on occasion."
Virgin birth has been proven in some bony fish, amphibians, reptiles, birds
Virginia aquarium case is nation's second; first was in Nebraska
Next Article in U.S. »

RICHMOND, Virginia (AP) -- Scientists have confirmed the second case of a "virgin birth" in a shark.

The first documented case of asexual reproduction, or parthenogenesis, among sharks involved a pup born to a hammerhead at an Omaha, Nebraska, zoo.

Tags: baby, asexual, shark

DNA test proves it -- baby shark has no father

Fri, 10 Oct 2008 15:11:34 GMT

clipped by: deadcowkid
clipper's remarks: Watch out guys, soon we may not be needed.

Clip Source: www.cnn.com

DNA test proves it -- baby shark has no father

RICHMOND, Virginia (AP)

Scientists have confirmed the second case of a "virgin birth" in a shark.

A blacktip shark in the wild patrols the vast expanse of the Indian Ocean.

The first documented case of asexual reproduction, or parthenogenesis, among sharks involved a pup born to a hammerhead at an Omaha, Nebraska, zoo.

"It is very unlikely that a small number of female survivors could build their numbers up very quickly by undergoing virgin birth," Chapman said.

Tags: virgin births, sharks, birth, virgins, dna

Obscene Profits--and Now a Free Ride?

Wed, 01 Oct 2008 12:12:41 GMT

clipped by: papananook
clipper's remarks: I's such a scam...and we'll be forced to accept their terms of a Bailout.

Clip Source: www.brasschecktv.com

Predatory lending in America

[Video]

Interview with the filmmaker

[Video]

It wasn't an accident

Guess who the biggest campaign contributor to George W. Bush is?

MBNA, a big credit card company.

MBNA wrote the legislation that radically changed the bankruptcy laws in the US.

Predatory lending, which used to be the province of criminal loan sharks, is now the norm in the lending industry in the US.

Kissing Balance: The Best OCD Ever!

Tue, 30 Sep 2008 20:57:50 GMT

clipped by: carrerinyes
clipper's remarks: I'd be willing to spend many a year working with Mr. Insanity #348!!

Clip Source: www.saneorinsane.com

Post your cute quirks, habits and OCDs...
And we'll tell you if you're insane!
Also enjoy, rate, sympathize and discuss
other people's craziness.

Kissing Balance (Insanity #348)

I have to kiss in equal parts. If i spend x amount of time kissing one side of a woman's face, I then have to by some decree spend that amount of time equally on the other side. Its some cosmic fairness principal. It annoys me to only half-do the one side. Weird. I'm keeping up with the balance in my mind. Its OCD I swear. but since its an internal thing no one seems to notice or mind.

Clip Source: www.saneorinsane.com

toilet sharks (Insanity #360)

i have a weird fear of sharks coming up the toilet, i know that this is virtually impossible but maybe just by chance it happens, im stuck and there is a shark in my toilet, scary.

Comments (Newest First)

Holy crap! I saw that X Files episode too, and was afraid of a hand coming up out of the toilet and giving me an involuntary hysterectomy.

VIDEO: Odd Sharks Bred in Captivity

Mon, 29 Sep 2008 03:49:36 GMT

clipped by: A53GG4

Clip Source: news.nationalgeographic.com

VIDEO: Odd Sharks Bred in Captivity

[Video]

September 23, 2008—Looking like a cross between a catfish and a stingray, the rare wobbegong shark species has been bred in captivity in Australia. Some of the sharks have now been tagged and released to aid researchers.

Tags: animals

Odyssey IV -- MIT's Robotic Underwater Helicopter

Sun, 28 Sep 2008 18:17:04 GMT

clipped by: rj3sp

Clip Source: www.physorg.com

New underwater robot can hover in place

(PhysOrg.com) -- MIT researchers have designed a new robotic underwater vehicle that can hover in place like a helicopter -- an invaluable tool for deepwater oil explorers, marine archaeologists, oceanographers and others.

The new craft, called Odyssey IV, is the latest in a series of small, inexpensive artificially intelligent submarines developed over the last two decades by the MIT Sea Grant College Program's Autonomous Underwater Vehicles Laboratory. The Odyssey series revolutionized underwater research in the 1990s by introducing the thrifty and highly capable underwater robots. But the previous Odyssey vehicles still had one significant limitation: Like sharks, they could only operate while continuously moving forward.

Clip Source: web.mit.edu

[Video]

The Odyssey IV AUV, temporarily tethered, is driven around by a joystick. Video courtesy MIT AUV Lab.
View more Odyssey IV videos on YouTube

Clip Source: scripts.mit.edu

Tags: mit, robot, underwater, vehicle, helicopter, submarine

Over 100 new sharks, rays in Australia

Thu, 25 Sep 2008 22:41:06 GMT

clipped by: RecordSage

Clip Source: news.nationalgeographic.com

PHOTOS: 100+ New Sharks, Rays Named in Australia

The skate--a type of ray--is among 113 new species of Australian sharks and rays discovered during a study of museum specimens, scientists at the Australian Commonwealth Scientific and Research Organization (CSIRO) announced this week. (Read full story.)

100+ New Sharks, Rays Discovered in Australia

Wed, 24 Sep 2008 22:05:54 GMT

clipped by: JohnWaterman

Clip Source: news.nationalgeographic.com

September 19, 2008--The newly named maugean skate may go extinct before scientists have a chance to fully document it.

Clip Source: news.nationalgeographic.com

The newfound tropical saw shark Pristiophorus delicatus, which sports a long, bladelike snout, scissors through waters off the Australian state of Queensland.

Clip Source: news.nationalgeographic.com

Sharks--such as the new Australian reticulate swell shark Cephaloscyllium hiscosellum--play an important role as top predators

Clip Source: news.nationalgeographic.com

In northern Australia, a group of rare freshwater sharks stalk their prey through tropical rivers, including the speartooth shark Glyphis glyphis.

Clip Source: news.nationalgeographic.com

The southern dogfish's choice of coastal living may be its undoing.

Clip Source: news.nationalgeographic.com

The northern river shark is one of two freshwater species discovered during a recent research effort

shark bites

Wed, 24 Sep 2008 17:24:36 GMT

clipped by: redheadplantguy

Clip Source: www.great-goofy-gadgets.com

Sharks can be dangerous even before they are born. One scientist was bitten by a sand tiger shark embryo while he was examining its pregnant mother.

Clipmarks | Sharks Clips

Second case of virgin birth found in sharks

Scientists confirm shark's ‘virgin birth’

NOT Science Fiction

Of Virgin-Birth

'Virgin Birth' By Shark Confirmed: Second Case Ever

Vigrin Birth

Real Life Jaws

DNA test proves it--baby shark has no father

Share this on:

DNA test proves it -- baby shark has no father

DNA test proves it -- baby shark has no father

DNA test proves it -- baby shark has no father

Obscene Profits--and Now a Free Ride?

Interview with the filmmaker

Kissing Balance: The Best OCD Ever!

Kissing Balance (Insanity #348)

toilet sharks (Insanity #360)

VIDEO: Odd Sharks Bred in Captivity

VIDEO: Odd Sharks Bred in Captivity

Odyssey IV -- MIT's Robotic Underwater Helicopter

New underwater robot can hover in place

Over 100 new sharks, rays in Australia

PHOTOS: 100+ New Sharks, Rays Named in Australia

100+ New Sharks, Rays Discovered in Australia

shark bites