| Ice Age Canadian Lakes | |
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Source: earthobservatory |
1/21/2022 |
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The Manitoba Great Lakes—Winnipeg, Winnipegosis, and Manitoba— are smaller than their more famous Great Lake neighbors to the south, but they can claim more wetlands along their shores. Forty-three percent of the land area of the province of Manitoba, Canada, is covered by bogs, fens, marshes, swamps, and open shallow water.
The origins of the lakes and the wetlands can both be traced to the last ice age. The modern wetlands result from the region’s low-lying topography, which was leveled by advancing and retreating ice sheets. The three Manitoba Great Lakes, however, are actual remnants of glacial Lake Agassiz. This was an ice-dammed lake that formed south of the Laurentide Ice Sheet about 14,500 years ago. At its largest, Lake Agassiz was 1,125 kilometers (700 miles) long and 400 kilometers (250 miles) wide. As the ice dams melted and receded at the end of the ice age, about 8,000 years ago, outlets to the sea opened and the lake drained, leaving behind the deeper lakes we now call great. |
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The above image, acquired by the Operational Land Imager (OLI) on Landsat 8 on November 3, 2021, shows two of the three great lakes, along with Cedar Lake, in south-central Manitoba. (Note that Norman Kuring, a retired researcher from NASA’s Ocean Biology group applied color-filtering techniques to the image to draw out the fine details in the water. Those features are real but might not be as apparent to the unaided human eye.)
The colorful swirls in the relatively clear and shallow lakes—Lake Cedar’s maximum depth is about 10 meters (32 feet)—are likely due to suspended sediment and phytoplankton. The lakebeds are covered in fine-grained silt, clay, and calcium-carbonate sediments, which give some of the lakes their chalky blue hues. (Little Limestone Lake stands out.) The region is underlain by dolomite, a calcium-magnesium-carbonate rock similar to limestone that was deposited during the Paleozoic Era when the landmass was under a shallow, tropical sea. |
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| News Id | | Source | Stamp | country |
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| 3502 | From hake to skate: Behind the push to bring 'unknown' fish to New England's dinner table | providencejournal | 2021-07-29 | US |
| 3503 | Seven-foot-long fish is 'largest ever seen in Manchester' | telegraph | 2016-12-13 | UK |
| 3504 | Eel not be right: Mass fish deaths at lake under investigation | stuff | 2016-12-16 | NZ |
| 3505 | New species of fish in Hawaii waters named after Obama | hawaii news now | 2016-12-21 | US |
| 3506 | This Russian fisherman has been showing off the nightmarish fish he finds | irish examiner | 2016-12-21 | RU |
| 3507 | Holy carp: how fish farming saved a Polish nunnery | the guardian | 2016-12-24 | UK |
| 3508 | Caviar, climate change and a Great Lakes fish | michigan radio | 2016-12-16 | US |
| 3509 | Pollution and climate change threaten fish in Ecuador’s Amazon region | Latin America News | 2021-07-31 | BR |
| 3510 | Fish managers say salmon runs ‘could have been worse,’ after underwater video shows heat-stressed salmon | NWNews | 2021-07-28 | US |
| 3511 | Massive and mysterious, a 100-pound fish washed ashore in Oregon. Scientists hope to learn its secrets | The Washington Post | 2021-07-18 | US |
| 3512 | 'Largest' recorded chum salmon run: 2 million fish overload nets, burden boats | CBC News | 2016-11-04 | CA |
| 3513 | North Carolina man hooks massive 112-pound catfish while fishing | cbsnews | 2016-12-02 | US |
| 3514 | New England fish believed to be spotted feeding in Nova Scotia's Clyde River | CBC News | 2021-07-23 | CA |
| 3515 | St. Louis teen breaks dad’s state record fish; Reels in 7th record for 2021 | wsiltv | 2021-07-20 | US |
| 3516 | Angler smashes British record when he takes 15 minutes, two broken nets and one maggot to land 34lb fish | dailymail | 2016-10-26 | UK |
| 3517 | 7,800 lake sturgeon, a 'culturally significant fish species,' released into Michigan waters | mlive | 2019-01-19 | US |
| 3518 | Вылов лосося в России в 2021 году вырос на 14% | tass | 2021-08-17 | RU |
| 3519 | 350-pound fish shocks anglers when it leaps out of the water | foxnews | 2021-07-23 | CA |
| 3520 | How Scientists Are Bringing Back Sturgeons, Fish That Once Swam With Dinosaurs | discovermagazine | 2021-07-23 | CA |
| 3521 | Montana’s Famed Trout Under Threat as Drought Intensifies | dnyuz | 2021-07-23 | US |
| 3522 | Climate crisis threatens access to nutrients in fish, study finds | theguardian | 2021-07-20 | UK |
| 3523 | Britain's rarest freshwater fish flourishing in southern Scotland | itv | 2016-10-21 | UK |
| 3524 | Dam Operator Accused of Killing Thousands of Fish in Maine | mainepublic | 2016-10-19 | US |
| 3525 | Danish anglers enlisted to catch rainbow trout accidentally released from fish farm | abc | 2016-10-12 | DM |
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