Mieux encore : un article où Goldman donne son avis sur Tessie !
Citer:
UC Davis in the News
1.15.2004
Tahoe World
On the trail of Tahoe Tessie: Dr. Goldman gives lowdown on lake monsters
by Melissa Siig, Tahoe World
Since man first started navigating earth's waters, tales of sea monster sightings put fear in the hearts of sailors. But reports of these creatures have not been limited to the world's vast oceans - they have also been seen in lakes.
Shaped like a giant serpent or water-borne dinosaur, these mythical beasts have brought fame to places such as Scotland's Loch Ness and Lake Champlain, which borders New York, Vermont and Quebec. Even Lake Tahoe reportedly has its own sea monster, Tahoe Tessie.
But do these creatures really exist? Dr. Charles Goldman, a limnologist and the foremost expert on Lake Tahoe, attempted to answer this question at the Resort at Squaw Creek last Thursday in a lecture, "USOs: Unidentified Swimming Objects." Presented by the Squaw Valley Institute, Goldman discussed his recent trip to Loch Ness and possible explanations for such mysterious sightings.
Last August, Goldman was invited to study Loch Ness by Professor Robert Rains, head of the Applied Science Institute at the Massachusetts Institute of Technology. Rains, a firm believer in the existence of the Loch Ness Monster, used sonar in the 1970s to take strobed photographs of "Nessie." These photographs determined the creature was 20 to 30 feet long and had humps. While other photos of Nessie, such as the famous one showing a long-necked creature rising out of the water, have been determined to be hoaxes, Goldman said Rains' photos are more difficult to discount. One is of a flipper "that looks terribly authentic," according to Goldman, and another shows a 20-foot-long body and head.
Nevertheless, Goldman said, as with Loch Ness, most sea monster sightings tend to be in deep, cold lakes which produce mirages brought on by temperature changes in the lake.
"That is why people see things that really don't exist," he said.
Other mysterious sightings have occurred at Lake Manitoba and Lake Okanagan in Canada, Lake Van in Turkey and Nahuel Huapi Lake in Argentina's Patagonia region.
The difficulty with verifying the existence of lake monsters, said Goldman, "is that you can prove something is there, but you can't prove something is not there." Thus far, the search for a lake creature has yet to produce any concrete evidence, he said.
Twenty years ago, Goldman held a conference at the University of Nevada, Reno on the subject of USOs. A number of scientists there testified they had seen Tahoe Tessie. All Tessie sightings have one thing in common, said Goldman - no one ever sees the head or tail, only dark objects in the water. Based on this, Goldman decided to conduct a number of experiments. He created a photo of "Tessie" by capturing the splash from rocks thrown in the water. Another photo shows what looks like a series of humps in the lake, but in reality are only waves.
"You have a flat lake with no boats visible, but boats did pass hours before, and the waves come back and amplify," explained Goldman.
However, Goldman also gave another possible explanation for Tessie spottings. While the 11,000-year old Lake Tahoe is too young to have a prehistoric creature swimming in its waters, it could be the home of a very large sturgeon.
Sturgeon have been known to reach 1,500 pounds and live for up to 100 years, and could have been introduced into the lake with fish stockings over the years, said Goldman. With more than 5,600 prey fish in Lake Tahoe, a massive sturgeon would have plenty of food supply to sustain it. Just in case the existence of a giant Tahoe sturgeon turns out to be true, Goldman has given it a scientific name - Acipenser Tahoensis.
On the other hand, "Tessie" may just be a mistaken river otter or beaver, Goldman told the audience.
Goldman would most likely be the one to know if Tessie is real, since he is the only person to have been to the bottom of Lake Tahoe. In 1979, he descended 1,000-feet below lake level in a submersible vessel. All he spotted were 400-year-old tree stumps left over from a serious drought. Goldman said he hopes to get a better look at Tahoe's depths next summer in "Project Deep Blue." If funding is available, Goldman would use the same remote-operated sub employed by Rains in Scotland to explore Lake Tahoe's bottom.
While the existence of Tahoe Tessie is unlikely, the Loch Ness Monster is more probable. Since the Irish Sea is connected to the Atlantic Ocean through a series of lochs, technically something could swim in from the ocean, explained Goldman. Oarfish, the longest of all fish, is a ribbon-like fish that has reached 20 to 30 feet and 400 pounds. Although it lives at 700 feet, Oarfish have occasionally been spotted on the surface and been mistaken for sea serpents. However, this summer Rains flew Goldman over Loch Ness to look for Nessie's remains. The monster, who has not been seen in a while, is believed to be dead.
Là encore, c'est la date de 1979 qui est citée.
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