![]() Jim Sheridan, a member of the Commons media select committee, said the experiment was intrusive. ![]() On Sunday evening, a senior British MP called for a parliamentary investigation into how Facebook and other social networks manipulated emotional and psychological responses of users by editing information supplied to them. Lawyers, internet activists and politicians said this weekend that the mass experiment in emotional manipulation was "scandalous", "spooky" and "disturbing". The study concluded: "Emotions expressed by friends, via online social networks, influence our own moods, constituting, to our knowledge, the first experimental evidence for massive-scale emotional contagion via social networks." Another test reduced exposure to "negative emotional content" and the opposite happened. One test reduced users' exposure to their friends' "positive emotional content", resulting in fewer positive posts of their own. ![]() I get to see everything and how it fits together because of eDNA,” Deeg said.In a study with academics from Cornell and the University of California, Facebook filtered users' news feeds – the flow of comments, videos, pictures and web links posted by other people in their social network. Researchers that work on whales only see the whales. Other researchers that work on plankton only see the plankton. “eDNA is great because I get to see the entire ecosystem. With eDNA you can almost always take a water sample, no matter how rough the sea is. It can be very challenging to catch salmon in the open water, especially in the winter. Some of these species include cows and pigs.ĮDNA is becoming an essential tool to explore salmon survival. According to Deeg, he was able to detect species that are clearly not present in the ocean. The contamination comes from all kinds of sources, but it’s mostly associated with human activities. With a glider it’s super cheap.”Ī main issues that is being dealt with during the research process is contamination. That is both super complex and takes a huge amount of money. “Now the robots are at a size where we can actually put them onto gliders and other remotely operated vehicles so that in the future we won’t need to send a boat with a crew out there anymore. According to Deeg, they are now using robots that are small and efficient that are able to collect samples automatically and preserve them. Technology for sampling eDNA is rapidly advancing. With eDNA, we can kind of fill these gaps that conventional surveys have in that kind of scenario,” Deeg said. “When we used conventional methods (trawl nets), we never caught salmon during the day. Now, it is easy to detect them at the same rates at both day and night. But during the day, they go down 400 meters to the deep ocean to hide from competitors. During the night, salmon come close to the surface, which is when the net is used to catch them. Because of this, scientists now use the cutting-edge technology to explain the challenges salmon face in the open water.īefore the use of eDNA, it was usually common to catch salmon at night using regular trawl nets. And so, again, with the eDNA, we can fill these gaps that conventional surveys have in that kind of scenario,” said Christoph Deeg, a researcher with the Pacific Salmon Foundation’s Salmon Health team and lead author of the study.Įnvironmental DNA, also known as eDNA, is released from an organism into the environment through feces, mucous, gametes, shed skin, hair and carcasses. ![]() “We were missing half of our data points with conventional gear, but with the eDNA, it sticks around long enough that we can detect them even during the day. study using salmon DNA to count annual runs Studies done through the use of eDNA have now changed that. Salmon survival is usually an uncommon research topic, due to the difficulties in collecting data on salmon. These include their prey, predators and competitors. A new study on eDNA shows the distribution of salmon and key organisms they share the seas with. Pacific salmon spend the bulk of their life in the open ocean, but there is not much known about the number of challenges to survival they face while navigating through the waters. New research shows that salmon scientists can now collect and analyze environmental DNA to better understand the ecosystem in which salmon navigate at sea.
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