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NOAA Great Lakes Food Web Diagrams direct Author NOAA, Great Lakes Environmental Research Laboratory: Mason, Krause, and Ulanowicz, 2002 - Modifications for Lake Superior, 2009.
Lake Superior deepest point [4] on the bathymetric map. [1] Lake Superior has a surface area of 31,700 square miles (82,103 km 2), [7] which is approximately the size of South Carolina or Austria. It has a maximum length of 350 statute miles (560 km; 300 nmi) and maximum breadth of 160 statute miles (257 km; 139 nmi). [8]
Siskiwit Lake [1] is the largest lake on Isle Royale in Lake Superior. 4,150 acres (16.8 km 2) in area, [2] the lake has cold, clear water which is relatively low in nutrients. [3] Tributaries include the Little Siskiwit River , and the lake's outlet is the Siskiwit River which flows into Lake Superior.
A freshwater aquatic food web. The blue arrows show a complete food chain (algae → daphnia → gizzard shad → largemouth bass → great blue heron). A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
In Lake Michigan the sea lamprey began to decimate indigenous fish populations in the 1930s and 1940s. It may have entered the Great Lakes region through the Erie Canal which opened in 1825. [11] and spread even further in 1919 with improvements to the Welland Canal from Lake Ontario to Lake Erie, Lake Michigan, Lake Huron, and Lake Superior.
In early winter Lake Superior's waves splashing against the stone tower of the Stannard Rock Light built a layer of ice that forced maintenance crews to hack away the ice around the door to reach the men. If an illness, accident, or fire occurred at the Stannard Rock Light it could be days or even weeks before the keepers got assistance.
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The rainbow smelt (Osmerus mordax) is a North American species of fish of the family Osmeridae. Walleye, trout, and other larger fish prey on these smelt.The rainbow smelt prefer juvenile ciscoes, zooplankton such as calanoid copepods (Leptodiaptomus ashlandi, L. minutus, L. sicilis), and other small organisms, but are aggressive and will eat almost any fish they find.