| Ice Age Canadian Lakes | |
|
Source: earthobservatory |
1/21/2022 |
|
|
|
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. |
|
|
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. |
|
|
|
|
| News Id | | Source | Stamp | country |
| 3626 | Norwegian fish farms fight sea lice with 'Star Wars' | dw | 2016-02-05 | NO |
| 3627 | Oregon biologists won't condone end to catch-and-release fishing for sturgeon in lower Columbia River | oregonlive | 2016-01-09 | US |
| 3628 | Britain's finest chefs hunt for Norway's most prized fish in icy Arctic waters | independent | 2016-01-31 | UK |
| 3629 | Print an Army of Giant, Articulated Fish From This 3-D Database | wired | 2016-01-28 | US |
| 3630 | The Parrot: What other celebrity fish are in the giant carp's league? | independent | 2016-01-27 | UK |
| 3631 | Tui chub alert: Why one single fish has wildlife experts in Oregon scrambling | csmonitor | 2016-01-27 | US |
| 3632 | This enormous catch broke an ice fishing record in Lapland | thelocal | 2016-01-25 | SE |
| 3633 | Для чего в России создают робота-тунца? | aif | 2021-07-06 | RU |
| 3634 | Emperor Emeritus Akihito discovers 2 new types of goby fish | asahi | 2021-06-25 | JP |
| 3635 | Lice, infectious disease and taking reef fish: The impact of salmon farms on marine biodiversity | thejournal | 2021-06-26 | UK |
| 3636 | Girl, 15, lands big Chinook: ‘If you are a fish, you should definitely fear her.’ | chicago.suntimes | 2021-06-22 | US |
| 3637 | To Save Its Salmon, California Calls In the Fish Matchmaker | The New York Times | 2016-01-15 | US |
| 3638 | Scientists sound alarm over hydropower’s impacts on tropical fish biodiversity | mongabay | 2016-01-12 | CA |
| 3639 | Strange 6ft deep-sea fish washes up in Alaska | Earth Touch News | 2016-01-11 | US |
| 3640 | Asian carp could become most common fish in Lake Erie, study finds | kitchener.ctvnews | 2016-01-04 | CA |
| 3641 | How satellite technology is helping to fight illegal fishing | theguardian | 2016-01-04 | UK |
| 3642 | Family says parasites were in fish bought at California Costco | fox5sandiego | 2015-12-31 | US |
| 3643 | Farage fury at EU ban on anglers keeping fish | express | 2015-12-29 | UK |
| 3644 | Fish rage: Locals block wharf after fishermen filmed with 'thousands' of pink maomao in bins in Tairua | nzherald | 2021-06-25 | NZ |
| 3645 | Spanish mackerel stocks under threat from overfishing, government says | ABC Rural | 2021-06-13 | SP |
| 3646 | NSW man gets $11k penalty for making more than $200k selling protected fish | ABC Broken Hill | 2021-06-16 | AU |
| 3647 | New fish scale determines weight based on tail size | dailyamerican | 2015-12-29 | US |
| 3648 | These Fish Went From Saltwater To Freshwater In Just Fifty Years | gizmodo | 2015-12-18 | US |
| 3649 | Record fish haul confirms recovery of North Sea stocks, say industry figures | heraldscotland | 2015-12-18 | UK |
| 3650 | Salmon lovers rejoice, you may be allowed to ‘suspiciously handle’ the fish soon | metro | 2015-12-15 | UK |
|
|
|
|
|
|