Tag Archives: lake huron

Prehistoric caribou hunting structure discovered beneath Lake Huron

ANN ARBOR — Underwater archaeologists have discovered evidence of prehistoric caribou hunts that provide unprecedented insight into the social and seasonal organization of early peoples in the Great Lakes region.

An article detailing the discovery of a 9,000-year-old caribou hunting drive lane under Lake Huron appears in today’s issue of the Proceedings of the National Academy of Sciences. (more…)

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Limited food may be significantly changing Great Lakes ecosystems

ANN ARBOR — Declines of the food resources that feed lake organisms are likely causing dramatic changes in the Great Lakes, according to a new study.

The study, led by the U.S. Geological Survey and co-authored by three University of Michigan researchers, found that since 1998, water clarity has been increasing in most Great Lakes, while phytoplankton (the microscopic water organisms that feed all other animals), native invertebrates and prey fish have been declining. These food web changes fundamentally affect the ecosystem’s valuable resources and are likely caused by decreasing levels of lake nutrients, and by growing numbers of invasive species such as zebra and quagga mussels. (more…)

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Forecast for Titan: Wild Weather Could be Ahead

Saturn’s moon Titan might be in for some wild weather as it heads into its spring and summer, if two new models are correct. Scientists think that as the seasons change in Titan’s northern hemisphere, waves could ripple across the moon’s hydrocarbon seas, and hurricanes could begin to swirl over these areas, too. The model predicting waves tries to explain data from the moon obtained so far by NASA’s Cassini spacecraft. Both models help mission team members plan when and where to look for unusual atmospheric disturbances as Titan summer approaches.

“If you think being a weather forecaster on Earth is difficult, it can be even more challenging at Titan,” said Scott Edgington, Cassini’s deputy project scientist at NASA’s Jet Propulsion Laboratory, Pasadena, Calif. “We know there are weather processes similar to Earth’s at work on this strange world, but differences arise due to the presence of unfamiliar liquids like methane. We can’t wait for Cassini to tell us whether our forecasts are right as it continues its tour through Titan spring into the start of northern summer.” (more…)

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U-M Divers Retrieve Prehistoric Wood from Lake Huron

ANN ARBOR, Mich.— Under the cold clear waters of Lake Huron, University of Michigan researchers have found a five-and-a-half foot-long, pole-shaped piece of wood that is 8,900 years old. The wood, which is tapered and beveled on one side in a way that looks deliberate, may provide important clues to a mysterious period in North American prehistory.

“This was the stage when humans gradually shifted from hunting large mammals like mastodon and caribou to fishing, gathering and agriculture,” said anthropologist John O’Shea. “But because most of the places in this area that prehistoric people lived are now under water, we don’t have good evidence of this important shift itself– just clues from before and after the change. (more…)

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Woods Hole Oceanographic Institution’s Advanced Imaging Lab Assists in Location of Thunder Bay Shipwrecks

When a group of five high school students embarked on Project Shiphunt, an expedition in search of lost shipwrecks, in May in Lake Huron, the Woods Hole Oceanographic Institution’s Advanced Imaging and Visualization Lab (AIVL) was there, surveying and capturing 3D footage of the finds. The work was conducted as part of Project Shiphunt, an initiative developed by Sony and Intel Corp and led by National Oceanic and Atmospheric Association (NOAA).

“It was gratifying to be a part of a project that engages kids in the excitement of exploration and discovery,” said Bill Lange, director of AIVL. Lange led a crew of videographers, divers and pilots of two remotely operated vehicles (ROV) during the expedition. “Our Sony cameras gave the students the ability to have that experience in real time and in some cases to direct the cameras to investigate specific features of the wreck.  The high-definition footage we collected will be invaluable to scientists and marine archaeologists working to learn from the wrecks.” (more…)

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Invasive Mussels Causing Massive Ecological Changes in Great Lakes

ANN ARBOR, Mich. — The ongoing spread of non-native mussels in the Great Lakes has caused “massive, ecosystem-wide changes” throughout lakes Michigan and Huron, two of the planet’s largest freshwater lakes, according to a new University of Michigan-led study.

The blitzkrieg advance of two closely related species of mussels—the zebra and quagga—is stripping the lakes of their life-supporting algae, resulting in a remarkable ecological transformation and threatening the multibillion-dollar U.S. commercial and recreational Great Lakes fisheries. (more…)

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