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MessagePosté le: Mer 1 Aoû - 06:58 (2018)    Sujet du message: Cheap New York Yankees Hats Répondre en citant

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While there is no easy method for detecting sea creatures' presence in the vast watery realm, researchers at Stanford University show progress in using deoxyribonucleic acid (DNA) analysis to detect ocean animals in locations where the water can be over 7,200 feet, or nearly 2,200 meters Ronald Leary Limited Jersey , deep.

"We want to know what's out there," said Elizabeth A. Andruszkiewicz, a graduate student in Stanford's Department of Civil and Environmental Engineering and lead author of a paper published in PLOS ONE. "Eventually, this technology may answer bigger questions, such as how communities of organisms have adapted to environmental changes over time."

Of the few previous environmental DNA, or eDNA, studies of ocean animals Menelik Watson Limited Jersey , all were done in relatively shallow nearshore environments. Most were done in controlled systems such as saltwater tanks. The Stanford-led study was done in the deep waters of Monterey Bay, an important ecosystem in the California Current, which flows southward along the western coast of North America.

Collecting eDNA is fairly straightforward, as a basic water sample does the trick, and researchers can archive these samples for long periods by freezing them. The approach promises a faster and less invasive way to measure abundance and distribution of organisms. "This could revolutionize the way we keep track of animals," said study co-author Alexandria Boehm, professor of civil and environmental engineering at Stanford.

The eDNA survey identified 72 species of vertebrates Shaquil Barrett Limited Jersey , namely marine fishes, mammals such as elephant seals, humpback whales, sharks and rockfishes, at study sites across 28 miles, or 45 kilometers, of the Monterey Bay National Marine Sanctuary. The researchers found DNA of some creatures Shelby Harris Limited Jersey , such as sunfishes, salmon, seahorses and mackerel sharks, only in locations where the water was less than 600 feet, or about 183 meters, deep. DNA of other animals, such as dolphins and marine smelts Justin Simmons Limited Jersey , turned up only in waters more than 600 feet deep.

The shallowest waters held the greatest biodiversity.

Taken as a whole, the findings provide a proof of concept for eDNA as an ocean sleuthing tool.

"It is a remarkably powerful way to answer a simple question: What species are present in space and time in our oceans?" co-author Barbara Block, the Charles and Elizabeth Prothro Professor in Marine Sciences at Stanford, was quoted as saying in a news release "It could change how we view our planet's marine biodiversity."

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