Embryonic Sharks Freeze to Avoid Detection

Jane J. Lee


Although shark pups are born with all the equipment they'll ever need to defend themselves and hunt down food, developing embryos still stuck in their egg cases are vulnerable to predators. But a new study finds that even these baby sharks can detect a potential predator, and play possum to avoid being eaten.

Every living thing gives off a weak electrical field. Sharks can sense this with a series of pores—called the ampullae of Lorenzini—on their heads and around their eyes, and some species rely on this electrosensory ability to find food buried in the seafloor. (See pictures of electroreceptive fish.)

Two previous studies on the spotted catshark (Scyliorhinus canicula) and the clearnose skate (Raja eglanteria)—a relative of sharks—found similar freezing behavior in their young. But new research by shark biologist and doctoral student Ryan Kempster at the University of Western Australia has given scientists a more thorough understanding of this behavior.

It all started because Kempster wanted to build a better shark repellent. Since he needed to know how sharks respond to electrical fields, Kempster decided to use embryos. "It's very hard to test this in the field because you need to get repeated responses," he said. And you can't always get the same shark to cooperate multiple times. "But we could use embryos because they're contained within an egg case."

Cloaking Themselves

So Kempster got his hands on 11 brownbanded bamboo shark (Chiloscyllium punctatum) embryos and tested their reactions to the simulated weak electrical field of a predator. (Popular pictures: Bamboo shark swallowed whole—by another shark.)

In a study published today in the journal PLoS One, Kempster and his colleagues report that all of the embryonic bamboo sharks, once they reached later stages of development, reacted to the electrical field by ceasing gill movements (essentially, holding their breath), curling their tails around their bodies, and freezing.

A bamboo shark embryo normally beats its tail to move fresh seawater in and out of its egg case. But that generates odor cues and small water currents that can give away its position. The beating of its gills as it breathes also generates an electrical field that predators can use to find it.

"So it cloaks itself," said neuroecologist Joseph Sisneros, at the University of Washington in Seattle, who was not involved in the study. "[The embryo] shuts down any odor cues, water movement, and its own electrical signal."

Sisneros, who conducted the previous clearnose skate work, is delighted to see that this shark species also reacts to external electrical fields and said it would be great to see whether this is something all shark, skate, and ray embryos do.

Marine biologist Stephen Kajiura, at Florida Atlantic University, is curious to know how well the simulated electrical fields compare to the bamboo shark's natural predators—the experimental field was on the higher end of the range normally given off.

"[But] they did a good job with [the study]," Kajiura said. "They certainly did a more thorough study than anyone else has done."

Electrifying Protection?

In addition to the freezing behavior he recorded in the bamboo shark embryos, Kempster found that the shark pups remembered the electrical field signal when it was presented again within 40 minutes and that they wouldn't respond as strongly to subsequent exposures as they did initially.

This is important for developing shark repellents, he said, since some of them use electrical fields to ward off the animals. "So if you were using a shark repellent, you would need to change the current over a 20- to 30-minute period so the shark doesn't get used to that field."

Kempster envisions using electrical fields to not only keep humans safe but to protect sharks as well. Shark populations have been on the decline for decades, due partly to ending up as bycatch, or accidental catches, in the nets and on the longlines of fishers targeting other animals.

A 2006 study estimated that as much as 70 percent of landings, by weight, in the Spanish surface longline fleet were sharks, while a 2007 report found that eight million sharks are hooked each year off the coast of southern Africa. (Read about the global fisheries crisis in National Geographic magazine.)

"If we can produce something effective, it could be used in the fishing industry to reduce shark bycatch," Kempster said. "In [America] at the moment, they're doing quite a lot of work trying to produce electromagnetic fish hooks." The eventual hope is that if these hooks repel the sharks, they won't accidentally end up on longlines.


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Flu Kills 4 Seniors, Sickens 700 in Boston













An early and nasty flu season has prompted a public health emergency in Boston, where health officials say 700 people have been diagnosed with the cold-weather virus. Four Bostononians -- all elderly -- have died from flu.


"This is the worst flu season we've seen since 2009, and people should take the threat of flu seriously," Boston Mayor Thomas Menino said in a statement.


This time last year the city had seen only 70 cases of influenza, The Associated Press reported. And with flu activity likely to extend into March or even April, the number will only grow.


Menino said the city is working with health care centers to offer free flu vaccines, and he urged anyone with flu-like symptoms to stay home from work or school.


"This is not only a health concern, but also an economic concern for families," he said in the statement. "I'm urging residents to get vaccinated if they haven't already."


Eighteen people have died from flu in Massachusetts, one of 41 states battling widespread influenza outbreaks. Emergency rooms across the country have been overwhelmed with flu patients, turning away some of them and others with non-life-threatening conditions for lack of space.


The proportion of people seeing their doctor for flu-like symptoms jumped to 5.6 percent from 2.8 percent in the past month, according to the CDC.








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Northwestern Memorial Hospital in Chicago reported a 20 percent increase in flu patients every day. Northwestern Memorial was one of eight hospitals on bypass Monday and Tuesday, meaning it asked ambulances to take patients elsewhere if they could do so safely.


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Most of the hospitals have resumed normal operations, but could return to the bypass status if the influx of patients becomes too great.


"Northwestern Memorial Hospital is an extraordinarily busy hospital, and oftentimes during our busier months, in the summer, we will sometimes have to go on bypass," Northwestern Memorial's Dr. David Zich said. "We don't like it, the community doesn't like it, but sometimes it is necessary."


A tent outside Lehigh Valley Hospital in Salisbury Township, Pa., was set up to tend to the overflowing number of flu cases.


A hospital in Ohio is requiring patients with the flu to wear masks to protect those who are not infected.


State health officials in Indiana have reported seven deaths. Five of the deaths occurred in people older than 65 and two younger than 18. The state will release another report later today.


Doctors are especially concerned about the elderly and children, where the flu can be deadly.


"Our office in the last two weeks has exploded with children," Dr. Gayle Smith, a pediatrician in Richmond, Va., said


It is the earliest flu season in a decade and, ABC News Chief Medical Editor Dr. Besser says, it's not too late to protect yourself from the outbreak.


"You have to think about an anti-viral, especially if you're elderly, a young child, a pregnant woman," Besser said.


"They're the people that are going to die from this. Tens of thousands of people die in a bad flu season. We're not taking it serious enough."



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GAO calls on Postal Service to prefund retiree benefits



But not everyone agrees that removing or substantially reducing the prefunding requirement is the best way out of the USPS hole.


A recent Government Accountability Office report says the “USPS should prefund its retiree health benefit liabilities to the maximum extent that its finances permit.”

The GAO said that deferring the prefunding payments “could increase costs for future ratepayers and increase the possibility that USPS may not be able to pay for some or all of its liability.”

The report said the Postal Service’s financial condition makes it difficult for the agency “to fully fund the remaining $48 billion unfunded liability over the remaining 44 years of the schedule” set up by the 2006 Postal Accountability and Enhancement Act.

USPS officials say they can pay $0.00. The Postal Service is losing $25 million a day.

“If Congress was to eliminate the requirement for USPS to pay down its unfunded liability on retiree health care, taxpayers would almost certainly pick up the bill,” said House Oversight and Government Reform Committee Chairman Darrell Issa (R-Calif.). “USPS needs to cut costs, not cheat taxpayers or its own employees.”

The GAO report gives something to both sides, saying that the USPS should prefund its retiree health benefits, while acknowledging that it currently is too broke to do it.

In a response included in the GAO report, Joseph Corbett, the USPS chief financial officer and executive vice president, said the Postal Service “does not have the financial resources to make the prefunding payments required by current law.”

He criticized the GAO for releasing a report that did not include the controversial USPS proposal to sponsor its own health-care plan, outside of the Federal Employees Health Benefits Plan that now covers postal workers.

“Allowing the Postal Service to gain control of its own health care program would save money, reduce or eliminate the current unfunded liability, and allow for better management of health care costs going forward,” Corbett said.

Fredric Rolando, president of the National Association of Letter Carriers, called on Congress to “reject the GAO’s policy myopia. . . . Government records show that 80 percent of all the USPS red ink stems directly from prefunding.”


Report: Close the digital divide

Uncle Sam needs to get with the digital program.

That’s the takeaway from a report — with the appropriate title #ConnectedGov — on the government’s use of technology and social media. It is being released Wednesday by the Partnership for Public Service, in collaboration with the Booz Allen Hamilton consulting firm.

The report identifies innovative digital programs in seven agencies, demonstrating that “there are places in government that are doing immensely creative and impactful things,” said Max Stier, president and chief executive of the Partnership.

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Cool change aids Australia firefighters






SYDNEY: Cooler conditions helped firefighters battling blazes across Australia Wednesday but up to 30 were still out of control, destroying a handful of homes and killing thousands of livestock.

After facing one of the highest-risk fire days in its history on Tuesday, residents in hard-hit New South Wales state woke to shifting winds that caused temperatures to drop significantly.

While the mercury topped 42 degrees Celsius (107.6 F) in Sydney on Tuesday, it was forecast to peak at just 25 degrees Wednesday, while the Victorian capital Melbourne was down to 20.

The ratings on many bushfires were downgraded with none now at the "catastrophic" level which signifies fires will be uncontrollable, unpredictable and fast-moving, and evacuation the only safe option.

But NSW Rural Fire Service commissioner Shane Fitzsimmons warned against complacency, with new fronts breaking out despite the colder weather and a total fire ban still in place.

"It is far from over when it comes to the threat to New South Wales," he told reporters in Bookham, a small village in Yass Shire west of Canberra where a fire has so far burnt out 16,000 hectares (40,000 acres).

"We need to sustain the vigilance today. We are not out of the woods yet, the risk is very real and there's a long day ahead and a forecast for a return to hot conditions toward the weekend and into next week."

More than 2,000 firefighters worked through the night tackling more than 140 blazes across New South Wales, Australia's most populous state, with 30 of those uncontained.

One home was earlier believed to have been lost in the state, at Jugiong, but Fitzsimmons said it now appeared to be an outbuilding or shed.

"It's a tribute to firefighters across the state that we haven't got any homes destroyed," he said.

"But we've seen significant agricultural losses already been tallied up, thousands of hectares of pasture and crops, and stock in the thousands lost."

New South Wales Premier Barry O'Farrell said an estimated 10,000 sheep had perished in the Yass area alone.

Wildfires are a fact of life in arid Australia, where 173 people perished in the 2009 Black Saturday firestorm, the nation's worst natural disaster of modern times.

Most are ignited naturally, but in Sydney's west three teenage boys were charged with deliberately lighting a fire in bushland on Tuesday.

Victoria state has also been experiencing extreme conditions with four homes destroyed and six people treated for minor burns or smoke inhalation in a bushfire in the farming community of Carngham, which was evacuated.

Authorities said the fire was now under control.

Prime Minister Julia Gillard said the federal and state governments were working together in the recovery effort and to support victims.

"Firstly, it's all hands on deck fighting the fires, dealing with the emergency, and then we move into the recovery phase," she said.

No deaths have so far been reported.

While it was initially believed as many as 100 people could be missing in the southern island of Tasmania after wildfires razed more than 100 homes over the weekend, police said there was confusion about movements during the crisis.

"We know there have been no significant injuries, which is amazing, and we are encouraged that we haven't found any human remains at this stage," Tasmanian acting police commissioner Scott Tilyard told Sky News.

Much of southern Australia has been enduring a summer heatwave and in the nation's arid centre the popular tourist resort of Kings Canyon south of Alice Springs was damaged after a blaze spread from the Watarrka National Park.

-AFP/ac



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Earthquake hits India's northeast

SHILLONG: An earthquake of moderate intensity jolted India's northeast Wednesday morning. Officials said there were no immediate reports of casualties or damage to property.

The quake measured 5.9 on the Richter scale and was felt at 7.11 am.

According to the Regional Seismological Centre here, the epicentre lay in the India-Myanmar border.

Besides Meghalaya and Nagaland, the other states which felt the tremors included Manipur, Assam and Arunachal Pradesh, an official said.

India's northeast is considered to be the sixth most earthquake-prone belt in the world.

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Pictures: Wildfires Scorch Australia Amid Record Heat

Photograph by Jo Giuliani, European Pressphoto Agency

Smoke from a wildfire mushrooms over a beach in Forcett, Tasmania, on January 4. (See more wildfire pictures.)

Wildfires have engulfed southeastern Australia, including the island state of Tasmania, in recent days, fueled by dry conditions and temperatures as high as 113ºF (45ºC), the Associated Press reported. (Read "Australia's Dry Run" inNational Geographic magazine.)

No deaths have been reported, though a hundred people are unaccounted for in the town of Dunalley, where the blazes destroyed 90 homes.

"You don't get conditions worse than this," New South Wales Rural Fire Service Commissioner Shane Fitzsimmons told the AP.

"We are at the catastrophic level, and clearly in those areas leaving early is your safest option."

Published January 8, 2013

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Holmes Played Childish Games After Aurora Carnage













As police confronted the movie theater carnage and a massive booby trap left behind by accused Aurora gunman James Holmes, the suspect loopily played with hand puppets, tried to stick a metal staple in an electrical socket and clamly flipped a styrofoam cup, according to court testimony today.


Holmes, 25, displayed the bizarre behavior once he was in custody and taken to Aurora police headquarters after the shooting that left 12 people dead and dozens injured, the lead investigator in the case testified today.


While being cross examined by Colorado public defender Daniel King, Police Detective Craig Appel was asked about the observations of two Aurora officers assigned to watch over Holmes in an interrogation room.


Appel said that to preserve possible gunshot residue, police had placed paper bags over Holmes' hands. One officer, King said, noted in a report that Holmes began moving his hands "in a talking puppet motion."


Click here for full coverage of the Aurora movie theater shooting.


King asked if Appel was also aware that the officer "observed Holmes take a staple out of the table and tried to stick it in an electrical socket?" Appel confirmed Holmes' actions.








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The officers also noted that they watched as Holmes began playing with an empty styrofoam cup, trying to "flip it" on the table.


While Holmes was carrying out his childish antics, police were puzzling over a complex booby trap Holmes had left behind in his apartment, according to testimony.


A gasoline-soaked carpet, loud music and a remote control car were part of Holmes' plan to trick someone into triggering a blast that would destroy his apartment and lure police to the explosion while he shot up a movie theater in Aurora, Colo., according to court testimony.


FBI agent Garrett Gumbinner told the court that he interviewed Holmes on July 20, hours after he killed 12 and wounded 58 during the midnight showing of "The Dark Knight Rises."


"He said he rigged the apartment to explode to get law enforcement to send resources to his apartment instead of the theater," Gumbinner said.


His plan failed to prompt someone into triggering the bombs.


Gumbinner said Holmes had created two traps that would have set off the blast.


The apartment was rigged with a tripwire at the front door connected to a mixture of chemicals that would create heat, sparks and flame. Holmes had soaked the carpet with a gasoline mixture that was designed to be ignited by the tripwire, Gumbinner said.


"It would have caused fire and sparks," the agent said, and "would have made the entire apartment explode or catch fire."


Holmes had set his computer to play 25 minutes of silence followed by loud music that he hoped would cause a disturbance loud enough that someone would call police, who would then respond and set off the explosion by entering the apartment.


Gumbinner said Holmes also told him he rigged a fuse between three glass jars that would explode. He filled the jars with a deadly homemade chemical mixture that would burn so hot it could not be extinguished with water.






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Obama’s failure to nominate women for two top Cabinet posts questioned



Obama, who made women’s issues a core of his reelection bid, has nominated men to serve in three of his most prominent national security positions, including secretary of state, where Sen. John F. Kerry (D) was named last month to replace Hillary Rodham Clinton. The president on Monday announced former senator Chuck Hagel for the defense job and counterterrorism adviser John O. Brennan to head the CIA.


The moves have disappointed some supporters who said they fear, with Clinton’s departure, a paucity of females among Obama’s top advisers, particularly in the traditionally male-dominated field of defense and security.

Thomas Donilon, the president’s national security adviser, was in the audience, as outgoing Defense Secretary Leon E. Panetta and acting CIA director Michael J. Morrell joined their possible successors and the president.

The pattern is particularly striking for a president who was elected with majority support from women and racial minorities and focused heavily during his reelection campaign on women’s health concerns and equal pay in the workplace. Obama won 55 percent of the female vote to Republican rival Mitt Romney’s 44 percent.

Obama is committed to “finding the very best people for each job,” White House press secretary Jay Carney said Monday, when asked about the lack of women among the second-term appointments. “And that’s what he’s done today, and that’s what he’ll continue to do.”

Among those passed over to lead the Pentagon was Michele Flournoy, who became the highest-ranking woman to serve in the Defense Department when she was confirmed as undersecretary of defense for policy in 2009. Flournoy, 52, resigned from the role last February, citing a desire to spend more time with her family. But she also served as an adviser to Obama’s reelection campaign and was considered a top candidate.

Instead, Obama chose Hagel — who got to know Obama when he was a senator — though the Nebraska Republican has been criticized by GOP leaders and some Democrats for statements on Israel.

“I think he’s blowing a huge opportunity here for reasons I don’t even get,” said Rosa Brooks, a professor on national security at Georgetown University who spent two years working for Flournoy at the Pentagon.

“It would have been fantastic for this president to appoint the first woman secretary of defense,” Brooks said, “particularly given we are so embroiled at this moment in the ongoing conflict in the Islamic world, where the suppression of women is such a major issue. It was a chance for us to show we’re leading by example.”

Carney noted that Janet Napolitano, head of the Department of Homeland Security, and U.N. Ambassador Susan E. Rice are in top national security roles.

He added that Obama “insists on diversity on the lists that he considers for the job because he believes that in casting a broader net, you increase the excellence of the pool of potential nominees for these positions. But in the end he’ll make the choice that he believes is best for the United States.”

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Japan summons China envoy over islands dispute






TOKYO: Tokyo summoned the Chinese ambassador for the first time under the new nationalist government to "strongly protest" against the presence of official ships in waters around disputed islands.

The foreign ministry said it told China to stop sending the vessels to the area around a chain controlled by Japan under the name Senkakus, but claimed by China as the Diaoyus.

Deputy minister for foreign affairs Akitaka Saiki met with Chinese ambassador Cheng Yonghua from around 11:00am (0200 GMT) on Tuesday to protest against Beijing's dispatching of four ships Monday, the ministry said in a statement.

The ministry on Monday lodged a protest with the Chinese embassy by telephone.

It summoned Cheng on Tuesday for the first time since conservative Prime Minister Shinzo Abe came to power on December 26 with promises of assertive diplomacy to confront a confident China.

The ministry last summoned acting Chinese ambassador Han Zhiqiang on December 13 to file a strong protest after Beijing sent an airplane to the area. Japan scrambled fighter jets in response.

It was the first incursion by a Chinese state aircraft into Japanese airspace anywhere since Tokyo's military began monitoring in 1958.

In the meeting on Tuesday, Saiki "strongly protested over the Chinese public vessels' entry and staying for a long time inside Japanese territorial waters, as well as strongly demanded that such incidents do not happen again," the foreign ministry statement said.

Cheng responded by reiterating China's claim over the islands, but said he will report Japan's protest to Beijing, the foreign ministry said.

- AFP/al



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Hate speech: Akbaruddin Owaisi to go for medical test today

HYDERABAD: Police teams arrived at Majlis-e-Ittehadul Muslimeen (MIM) MLA Akbaruddin Owaisi's residence here on Tuesday morning, a day after the leader avoided arrest citing medical reasons. Owaisi had sought four days time to appear before the police.

According to reports, Owaisi will be taken for a medical test for determining whether he is fit for further questioning or not.

Owaisi, who returned from London on Monday, is facing a slew of cases for his alleged hate speeches that he delivered in December last year.

Akbaruddin arrived in Hyderabad via a Qatar Airways flight from London in the early hours of Monday. He was received by MIM legislators and hundreds of party supporters. The MLA then directly came to his residence located at Road Number 12 of Banjara Hills.

Earlier, BJP activists carried out protests and burnt effigies of Akbaruddin Owaisi at Nagulchinta, Moaza Jahi Market, Karbala Maidan, Ram Nagar and Musheerabad X Roads on Monday morning. Police arrested 43 BJP activists including their senior leader, Bandaru Dattatreya at Moazam Jahi Market and 10 more activists have been nabbed at Nagulchinta. Heavy bandobust has been provided at Akbaruddin's house to prevent untoward incidents.

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