Abstract
Video sediment‐profile images and cores were collected from a site 300 m deep in southeastern Lake Superior (47° 12.03'N, 86° 04.80'W) using a submersible. These observations revealed additional large linear trenches in bottom sediments made by the burbot Lota lota, first seen in 1985, and facilitated accurate measurement of their dimensions. Trench complexes have a U‐ to V‐shaped profile and are 3 to 5 m long, 15 cm wide for much of their length, and 10 to 25 cm deep. A V‐shaped incision observed in one trench cut as much as 8 to 12 cm below the base of the trench, into stiff light gray clay, and was filled with fluid dark‐gray surface muds. Burbot are thus capable of mixing surface sediments to a depth at least 30 cm below the sediment‐water interface. This datum is the deepest biogenic sediment mixing measured in the Great Lakes. Assuming average sedimentation rates of 0.01 to 0.03 cm/yr in this region of Lake Superior, we estimate that the last 3,000 yr of the postglacial sedimentary record may be loc...
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