New research sheds light on South Pole dinosaurs

Friday, August 5, 2011

Dog-sized dinosaurs that lived near the South Pole, sometimes in the dark for months at a time, had bone tissue very similar to dinosaurs that lived everywhere on the planet, according to a doctoral candidate at Montana State University.

That surprising fact falsifies a 13-year-old study and may help explain why dinosaurs were able to dominate the planet for 160 million years, said Holly Woodward, MSU graduate student in the Department of Earth Sciences and co-author of a paper published Aug. 3 in the journal "PLoS ONE."

"If we were trying to find evidence of dinosaurs doing something much different physiologically, we would expect it to be found in dinosaurs from an extreme environment such as the South Pole," Woodward said. "But based on bone tissues, dinosaurs living within the Antarctic Circle were physiologically similar to dinosaurs living everywhere else.

"This tells us something very interesting; that basically from the very start, early dinosaurs, or even the ancestors of dinosaurs, evolved a physiology that allowed an entire group of animals to successfully exploit a multitude of environmental conditions for millions of years," Woodward said.

Jack Horner, Woodward's adviser and Regents Professor of Paleontology/Curator of Paleontology at MSU's Museum of the Rockies, said Woodward's findings are consistent with other results from the museum's histology lab.

"I think the most important finding is that polar dinosaurs don't seem to be any different than any other dinosaurs in respect to how their bones grew," Horner said. "Dinosaurs have annual growth lines and those that don't have them are simply not yet a year old."

Woodward said she conducted her research after reading a 1998 study about polar dinosaurs. Intrigued by the study, she decided to review the findings and received a National Science Foundation grant that allowed her to travel to Australia last summer, set up a histology laboratory and analyze bones in a rare collection in Australia's Melbourne Museum.

Woodward analyzed the bone tissue of 17 dinosaurs that lived 112 to 100 million years ago during the latter part of the Early Cretaceous Period. All but one of the dinosaurs in her study were plant eaters. All lived in the Antarctic Circle in what is now known as the Australian state of Victoria.

Also participating in the study were the authors of the original study: Anusuya Chinsamy at the University of Cape Town in South Africa, Tom Rich at the Melbourne Museum and Patricia Vickers-Rich at Monash University in Australia.

The three scientists who conducted the original study welcomed her analysis and didn't mind that she falsified their hypothesis, Woodward said. She added that the new study looked at more dinosaur bones than the original study because more bones from the polar dinosaurs were available. Paleontologists have been adding to the collection over the past 25 to 30 years.

The original study looked at the bone microstructure of the polar dinosaurs and concluded that the differences they saw indicated that some dinosaurs survived harsh polar conditions by hibernating, while others evolved in a way that allowed them to be active year-round, Woodward said.

The new study showed that all but the youngest dinosaurs had "Lines of Arrested Growth" or LAGs, Woodward said. Since the hibernation hypothesis was based on the presence or absence of LAGs, the new study falsified the hypothesis.

LAGSs, in a bone cross section, look like tree rings, Woodward said. Like tree rings, they are formed when growth temporarily stops.

"Research on animals living today suggests that LAGs form annually, regardless of latitude or climate," Woodward said. "Like tree rings, LAGs can be counted to age an animal, so that the absence of these marks likely indicates a dinosaur was less than a year old. These marks have also been found in dinosaurs that lived at much lower latitudes having no need to hibernate."

The new study doesn't mean there was nothing unique about polar dinosaurs, but those qualities aren't apparent in bone tissue, Woodward said.

"It is very likely that dinosaurs living in different environments evolved specific adaptations ? either physical or behavioral ? to cope with environmental conditions," she said. "Analysis of bone microstructure can tell us a great deal about growth, but some things just aren't recorded in bone tissue."

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Article: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0023339

Montana State University: http://www.montana.edu

Thanks to Montana State University for this article.

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Source: http://www.labspaces.net/112388/New_research_sheds_light_on_South_Pole_dinosaurs

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Source: http://cocachasqui.org/why-select-luxury-cruise-on-celebrity-cruise-line-constellation/

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Japan town retreats from nuclear project near Fukushima plant (Reuters)

TOKYO (Reuters) ? Japan's Minamisoma City, about 20 km north of the crisis-hit Fukushima nuclear plant, became the country's first city since the crisis to pull back from plans to host a future nuclear plant by giving up a windfall from government subsidies, as safety concerns cast doubts over nuclear power's future.

Minamisoma has decided not to request infrastructure subsidies offered by the central government to communities that agree to house new nuclear plants, which it has been receiving since 1986 in conjunction with Tohoku Electric Power's plan to build a plant on the city's southern border.

Communities have shown increasing wariness toward new nuclear power projects since the March 11 earthquake and tsunami in northeast Japan triggered a protracted radiation crisis at Tokyo Electric Power's Fukushima Daiichi plant, the worst nuclear disaster since Chernobyl 25 years ago.

Japan has yet to hammer out a new nuclear energy policy after Prime Minister Naoto Kan called for a clean-slate review and said Japan should wean itself from nuclear power.

Before the March 11 disaster, Minamisoma had planned to use 52 million yen ($680,000) of the subsidies in its budget for the fiscal year to March 2012. It has received about 500 million yen in nuclear power-related subsidies since 1986/87.

The subsidies are financed by electricity bills paid by end-users via a scheme in place since the 1970s to promote nuclear power, as Japan sought to reduce its dependence on foreign oil, boost energy security and lower electricity costs.

The mayor of Minamisoma, Katsunobu Sakurai, criticized the central government's initial evacuation directives during the Fukushima crisis as confusing and putting lives in danger. Nearly half the town's residents remain away from their homes due to the disaster and subsequent radiation leaks.

"Having confronted this accident, we've changed our policy so as to get rid of nuclear power, to ensure the safety and security of our residents," said Hiroyuki Ishikawa, a city official.

Minamisoma, as a shareholder in Tokyo Electric and Tohoku Electric, voted for proposals to abolish nuclear plants at the utilities' annual shareholder meetings in June.

The city has not yet notified Tohoku Electric of its decision, which still requires approval by a municipal assembly meeting to be held later this year, Ishikawa said.

A spokesman for Tohoku Electric, which had planned to start commercial operation of the Namie-Odaka nuclear plant on Minamisoma's southern border in 2021/22, said this was not an appropriate time to discuss the company's nuclear plant construction plans.

In 2009/10, Japan paid a total of 93.7 billion yen in subsidies upon request to local governments that are hosting or plan to host nuclear plants, to support infrastructure and other projects, a trade ministry official said.

($1 = 76.890 Japanese Yen)

(Reporting by Risa Maeda; Editing by Edmund Klamann)

Source: http://us.rd.yahoo.com/dailynews/rss/japan/*http%3A//news.yahoo.com/s/nm/20110804/wl_nm/us_japan_nuclear_rejection

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