| 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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| 3952 | San Diego angler still fishing at 90, catches giant yellowtail | petethomasoutdoors | 2013-07-25 | US |
| 3953 | Fish-farm firm awarded $75,000 in defamation ruling | theglobeandmail | 2013-07-22 | CA |
| 3954 | Cut Off From the Ocean by a Volcanic Eruption, These Fish Had to Learn to Live in a Lake | hakaimagazine | 2021-05-03 | US |
| 3955 | At least 3.8 million fish killed by winter weather on Texas coast | brownwood news | 2021-05-04 | US |
| 3956 | Seaspiracy Producer Demands Biden Shut Down Fish Factory Farms | vegnews | 2021-05-06 | US |
| 3957 | Does ocean acidification alter fish behavior? Fraud allegations create a sea of doubt | sciencemag | 2021-05-06 | AU |
| 3958 | Combined effort to protect rarest native fish | odt | 2013-07-08 | NZ |
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| 3960 | Trouts under threat as deadly pesticide devastates top fishing river | express | 2013-07-05 | UK |
| 3961 | In Northern Minnesota, 37-inch pike found dead with 3-pound sucker stuck in jaws | twincities | 2013-07-04 | CA |
| 3962 | Ancient rockfish caught in Alaska: Why nobody threw it back | latimes | 2013-07-03 | US |
| 3963 | Growing cold | Antarctic Sun | 2013-07-05 | US |
| 3964 | Fish in Louisiana lake left covered in sores and blisters after parasite attack | Daily Mail | 2013-06-26 | US |
| 3965 | Bubble-eyed goldfish has to swim on his own in case he bumps into others and BURSTS his eyes | dailymail | 2013-06-26 | UK |
| 3966 | Hydromea unveils the world’s first wireless compact underwater drone | | 2021-05-17 | CH |
| 3967 | This underwater hut acts as a nursery to help the renewal of marine species in the Mediterranean | malaymail | 2021-04-26 | MC |
| 3968 | A singing fish: it glows green during courtship and looks like Boris Johnson’s hardship face | theguardian | 2021-04-27 | LK |
| 3969 | Stinging scorpion fish among 10 ‘uncommon species’ recently found in Florida waters | miamiherald | 2021-04-28 | US |
| 3970 | The scale of fish waste sent to landfill could feed a community | stuff | 2021-04-30 | NZ |
| 3971 | Asian carp spawn in more areas than 1st thought | CBC News | 2013-06-24 | CA |
| 3972 | Eklutna, Snettisham hydro projects still haven't redressed fish and wildlife damages | adn | 2017-12-02 | US |
| 3973 | How Igor The Amazonian Pacu Fish Found A Place Called Home | wlrn | 2013-06-20 | US |
| 3974 | Man gets jail for cheating in fishing tournament | bemidjipioneer | 2013-06-18 | US |
| 3975 | Former cheerleader, 19, becomes the first woman to win competition where hopefuls catch catfish with their BARE HANDS | dailymail | 2013-06-25 | UK |
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