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Tag: "temperatures" at biology news

Some like it hot: Worms at deep-sea vents favor a fiery 45-55°C

...ms dwelling at deep-sea hydrothermal vents opt for temperatures of 45-55 degrees Celsius (113-131 degrees Fahrenhe...tudied to date. This unique preference for extreme temperatures may be the undersea worms' meal ticket, since they are apparently the only animals able to access --...

Sex: It's costly but worth it. Just ask a microbe

...s, inhospitable conditions, lack of water, extreme temperatures and fewer nutrients," says Xu. There may be other benefits, too. "Every time DNA replicates and the microbes reproduce, mutations are introduced. While some mutations may be beneficial, most have no effect or are deleterious," says Xu. "Through mat...

El Nino events affect whale breeding

...her studies that following El Nino, changes in sea temperatures affect the availability of krill, a shrimp-like cr...re showing signs of recovery, however, sea surface temperatures in parts of the Southern Ocean have increased by 1°C over the last 50 years and if they continue to ...

Climate change drives widespread amphibian extinctions

...e. According to the scientists, the Earth's rising temperatures enhance cloud cover on tropical mountains, leading... fungus. The organism grows and reproduces best at temperatures between 63 to 77 degrees Fahrenheit (17 to 25 degrees centigrade). The fungus kills frogs mostly in...

Deep-rooted plants have much greater impact on climate than experts thought

...ch takes heat with it. Thus, the summer dry-season temperatures are cooler than would be expected. "When Jung-Eun incorporated this into the global climate model, we were better able to explain our observations and may be able to even predict future climate behavior," Dawson said. Because these plants store wat...

Australian first to save sight

... whole month. Previously, corneas were held at low temperatures and had to be transplanted within one week of the donation. Dr Graeme Pollock, Director of the Lions Corneal Donation Service, said no other corneal donation facility in Australia offered this kind of service. "Our ability to store the corneas for ...

Study finds evolution doesn't always favor bigger animals

...nly when the global ocean temperature cooled. When temperatures remained stable, not much happened to body size. ...es," said Hunt. Hunt and Roy found that as ocean temperatures declined by some 10 degrees centigrade, from 40 million years ago to the present day, the overall si...

Warming trend may contribute to malaria's rise

...ome scientists have speculated that rising average temperatures may be making conditions more favorable for mosquitoes and pathogen development, leading in turn to the surge in malaria cases. But a 2002 study found no significant changes in average temperature in the highlands of East Africa, where malaria has b...

Next good dinosaur news likely to come from small packages

...been resting in a swamp) can last for 200 hours at temperatures of 100 degrees Celsius. "If we have a protein sequence from bone, we can tell if the material is an original part of the organism that will provide interesting information about its past. We can know where it came from." Ostrom said. "Our goal is t...

Marine mammals are on the frontline of failing ocean health

...n Alaska as a result of climate change." Warming temperatures are likely to increase rainfall in the North, leading to increased run-off to ocean systems and melting of ice. These changes affect how contaminants are delivered to the food web, and thus to people. Habitat loss and increases in water temperature...

Climate change: The rice genome to the rescue

...ll make rice crops less productive with increasing temperatures decreasing yields. "Clearly, climate change is go...developing rice varieties that can tolerate higher temperatures and other aspects of climate change right now," he said. "Fortunately, the recent sequencing of the...

Tiny polyps gorge themselves to survive coral bleaching

...range centered about 26 degrees C. While the exact temperatures vary with individual species from location to loca... tanks, the water was heated, mimicking the rising temperatures leading to a bleaching event. After a month, fragments of the coral were gathered from all of the ...

Hot-spring bacteria flip a metabolic switch

...hile other microbes in the hot spring can tolerate temperatures that exceed 175°F. But until now, it was unclear w...he single-celled cyanobacteria growing at elevated temperatures were specialized for photosynthesis, but it looks like they have a more complicated metabolism than ...

Tropical Atlantic cooling and African deforestation correlate to drought, report scientists

...effects of global climate change. Tropical ocean temperatures and land vegetation have an important effect on Af...azing in equatorial Africa and increases in global temperatures through the emission of greenhouse gases will likely strongly affect the African monsoon system in t...

Scientist measures role of science's coolest player: The snow

...us found that in the absence of snow cover, global temperatures would likely spike by about eight-tenths of a degree Celsius. That increase represents as much as a third of the warming that climate change experts have predicted, should levels of heat-trapping greenhouse gases double. "This was not just a what-if...

NASA's AURA satellite peers into Earth's ozone hole

...erature of the air high in the atmosphere. As with temperatures on the ground, some years are colder than others. When it's colder in the stratosphere, more ozone is destroyed. The 2005 ozone hole was approximately 386,000 square miles larger than it would have been in a year with normal temperatures, because it ...

UCR environmental scientists propose chemical solution to cleaning California's Salton Sea

... hydrogen sulfide and ammonia concentrations, high temperatures and an increasing level of salinity. Due to noxious odors emanating from the Salton Sea, a 32 kilometer-long State Recreation Area on the northeast shore remains under-used. "The Salton Sea at one time attracted more visitors than Yellowstone Natio...

Health of coral reefs detected from orbit

...astal protection. Coral bleaching is linked to sea temperatures above normal summer maxima and to solar radiation. Bleaching may take place on localised and mass scales ?there was an extensive bleaching event in 1998 and 2002 likely linked to El Ni�o events. "An increase in frequency of coral bleaching may be ...

Missing fossil link 'Dallasaurus' found

...The Late Cretaceous period was a time of hot house temperatures and rising sea levels. "As the earth warmed and the seas rose, small land-dwelling lizards took to the oceans and developed increasing levels of seagoing capabilities, and over 30 million years, eventually evolving into the top predator of their dom...

Breaking the mold: Research teams sequence three fungus genomes

...home in the compost heap, A. fumigatus tolerates temperatures up to 70 degrees Celsius. The fungus becomes a hum...t body temperature, 37 degrees C. Altering ambient temperatures in the lab, TIGR scientists tracked gene activity, documenting different A. fumigatus genes that t...

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