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Tag: "seawater" at biology news

New research shows sharks use their noses and bodies to locate smells

...umes – one using squid scent and the other a plain seawater control. Minimally turbulent ‘oozing’ sources of squid odor and seawater control were physically separated from sources of major turbulence by placing a brick downstream fro...

Scientists uncover link between ocean's chemical processes and microscopic floating plants

...ink about, effects beyond acidification of surface seawater and greenhouse warming," said Donald Rice, director of NSF's Chemical Oceanography Program. Combining future experimental and modeling efforts will lead to a better understanding of the feedback systems between the atmosphere and ocean, believes Wi...

Darwin's famous finches and Venter's marine microbes

...and on to French Polynesia. Venter’s crew siphoned seawater through a series of increasingly fine filters to collect the microbes, which they sent back to the J. Craig Venter Institute in Maryland. In the lab, the scientists shredded the collected genetic material in millions of random snippets and then d...

How fish conquered the ocean

...rting from a fresh water environment to the saline seawater is demanding for the water balance of fishes", says professor Hans Jørgen Fyhn, a colleague of Dr. Finn, and adds, "This is especially so for their newly spawned eggs since they lack the adult organs and mechanisms responsible for coping with these p...

Microbes compete with animals for food by making it stink

...n two different pools for two days -- one group in seawater where microbes were allowed to grow naturally and the other in seawater with the antibiotic chloramphenicol added to suppress microbe growth. In the lab, stone crabs readil...

Hundreds of thousands of viral species present in the world's oceans

...ant with about as many of them in a bucket full of seawater as there are humans on the planet. As a result, they can have a huge impact ecologically. In a new study published online this week in the open access journal PLoS Biology, Florent Angly, Forest Rohwer, and colleagues detail their metagenomic study...

Special chip provides better picture of salmon health

..., bacterial and viral infection, and freshwater to seawater adaptation. The DNA chip will be able to identify changes in the activity of these genes and so alert us to any potential problems. It is too early to tell whether this chip will be a commercial success, but it certainly has the potential to be extre...

Report warns about carbon dioxide threats to marine life

...ning the extent of the impacts. "It is clear that seawater chemistry will change in coming decades and centuries in ways that will dramatically alter marine life," says Joan Kleypas, the report's lead author and a scientist at the National Center for Atmospheric Research (NCAR) in Boulder. "But we are only b...

Corals switch skeleton material as seawater changes

...erals depending on the chemical composition of the seawater around them. That's the startling conclusion draw...at it builds, Ries said, especially at a time when seawater is changing in response to global warming and the buildup of carbon dioxide in the atmosphere. A 20...

Researchers discover which organs in Antarctic fish produce antifreeze

...rom being frozen by ice crystals that come in with seawater and food. Internal fluids in notothenioids are about one-half as salty as seawater. While seawater reaches its freezing point at ?.91 degrees Celsius, fish fluids freeze at about ? degree Celsius. Th...

Ocean acidification threatens cold-water coral ecosystems

...hem to become slightly more acidic. This change in seawater chemistry could harm deep-sea calcifying animals l...ned by both warming oceans and chemical changes in seawater caused by the build-up of CO2 in the atmosphere. Above-average seawater temperatures have caused cor...

Secrets of the sea yield stronger artificial bone

...l Laboratory (Berkeley Lab) have harnessed the way seawater freezes to develop a porous, scaffolding-like mate...e, Tomsia and colleagues turned to the ocean. When seawater freezes, crystals of pure ice form layers, while impurities such as salt and microorganisms are expe...

The diversity of marine life in the Gulf of Maine region is much greater than previously thought

...rine food chain). Most are tiny. One teaspoon of seawater can hold more than a million phytoplankton (tiny plants that float with currents). Phytoplankton also are the species that give otherwise blue oceans (reflecting the color of the sky) their varying colors. Two of the microscopic plant species are ...

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

...archers placed them within a special high-pressure seawater aquarium with a sharp temperature gradient, these ... (662 degrees Fahrenheit). Because the surrounding seawater is barely above freezing, a steep and variable temperature gradient exists around the thermal vents,...

Thin tough skin, slow-growing gills protect larval Antarctic fish

...enioids are about half as salty as seawater. While seawater reaches its freezing point at -1.91 degrees Celsius, fish fluids will freeze at about -1 degree Celsius. The water where these species dwell rarely rises above the freezing point and is regularly filled with ice crystals. "The way that we've underst...

Too much sugar not good for coral reefs

...ow out of control as the level of simple sugars in seawater increases. "I set up a seawater system at the Smithsonian station in Bocas del Toro, Panama so that I could test individual componen...

MIT: Oceans are a major gene swap-meet for plankton

...er two." Such work is based on the discovery that seawater is absolutely loaded with invisible microbes. In trying to understand how this microbial system works, the MIT team has focused on Prochlorococcus as a model. The team's studies are showing that all Prochlorococcus strains "are very closely related...

High-tech tags on marine animals yield valuable data for biologists and oceanographers

...es, as well as the temperature and salinity of the seawater and how that changes with depth. As the sea lions travel along the coast diving for food, their tags transmit data back to the researchers via satellite. "They are a great animal for collecting oceanographic data and giving us updates on ocean condi...

Tiny polyps gorge themselves to survive coral bleaching

...fs sustained serious bleaching due to increases in seawater temperature and the animals died. "If the rain forests were dying off at this rate, we would all be panicking," explained Andrea Grottoli, an assistant professor of geological sciences at Ohio State and lead author of the study. "The problem is t...

Embryos tell story of Earth's earliest animals

...ad spherical embryos do not last long under normal seawater conditions. If the cell's own degradation processes don't destroy it, nearby bacteria will. The embryos must die in the presence of a so-called "reducing" substance, such as hydrogen sulfide. Such reducing substances slow or stop the internal degrada...

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