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- W2330565558 abstract "In the boreal forest of northeastern Alberta, Canada, we investigated the contention that, during winter, river otters (Lutra canadensis) lower water levels in ponds created by beavers (Castor canadensis). Ponds not visited by otters (control ponds) and ponds visited by unmarked otters or otters instrumented with implanted radio transmitters, were investigated for sites of water loss through dams. Both otters' ability to enter ponds through ice and pass through dams under ice, as evidenced by radiotelemetry and snow-tracking, were significantly associated with net water loss from ponds and with distinctive sites of water loss—trenches cut through dams. Trenches were not found in control ponds. Sticks exposed in dam passages penetrated by otters had parallel grooves separated by distances similar to those separating canine teeth on otter skulls. We conclude that otters dig passages through dams to insure under-ice access between adjacent water bodies. Possible secondary benefits may include increased access to air under ice, and more highly concentrated prey. Beavers repair most passages during times of open water. A partial commensalism appears to exist with otters benefitting from creation and maintenance of fish habitats by beavers." @default.
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- W2330565558 date "1988-02-25" @default.
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- W2330565558 title "River Otters as Agents of Water Loss from Beaver Ponds" @default.
- W2330565558 doi "https://doi.org/10.2307/1381752" @default.
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