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Details van artikel 22 van 76 gevonden artikelen
| Titel: |
Deep sediment mixing by burbot (Lota lota), Caribou Island Basin, lake superior, USA |
| Auteur: |
Boyer, Larry F. McCall, Peter L. Soster, Frederick M. Whitlatch, Robert B. |
| Verschenen in: |
Ichnos |
| Paginering: | Jaargang 1 (1990) nr. 2 pagina's 91-95 |
| Jaar: |
1990 |
| Inhoud: |
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 locally mixed by Lota lota. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 22 van 76 gevonden artikelen
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