Study

Movements and establishment of reintroduced European otters Lutra lutra,/i>

  • Published source details Sjöåsen T. (1997) Movements and establishment of reintroduced European otters Lutra lutra,/i>. Journal of Applied Ecology, 34, 1070-1080

Actions

This study is summarised as evidence for the following.

Action Category

Release captive-bred individuals to re-establish or boost populations in native range

Action Link
Terrestrial Mammal Conservation

Translocate to re-establish or boost populations in native range

Action Link
Terrestrial Mammal Conservation
  1. Release captive-bred individuals to re-establish or boost populations in native range

    A study in 1989–1992 at seven lakes in boreal forest in Sweden (Sjöåsen 1997; same experimental set-up as Sjöåsen 1996) found that following release, at least 14 of 36 captive-bred or wild-born translocated European otters Lutra lutra survived for at least one to two years. Fourteen otters had established home ranges and were still alive when last recorded, 362–702 days after release. Eight further otters were monitored until their transmitters failed or they moved out of radio contact, 89–219 days after release. Fourteen were known to have died, 18–750 days after release. Otter origin (captive-bred or wild-caught) did not affect movement distance. In 1989–1992, thirty-six otters (25 captive-bred and 11 wild-born, translocated otters) were released in lakes and rivers in southern Sweden. Otters were fitted with radio-transmitters. Radio-tracking was carried out at least monthly, in 1989–1992.

  2. Translocate to re-establish or boost populations in native range

    A study in 1989–1992 at seven lakes in boreal forest in Sweden (Sjöåsen 1997; same experimental set-up as Sjöåsen 1996) found that following release of European otters Lutra lutra (a mix of wild-caught translocated and captive-bred animals), at least 38% survived for almost a year or longer. Fourteen otters established home ranges and were still alive when last recorded, 362–702 days after release. Eight further otters were monitored until their transmitters failed or they moved out of radio contact, 89–219 days after release. Fourteen were known to have died, 18–750 days after release. Otter origin (wild-caught or captive-bred) did not affect movement distance. In 1989–1992 thirty-six otters (11 wild-caught, translocated animals and 25 captive-bred) were released in lakes and rivers in southern Sweden. Otters were fitted with radio-transmitters. Radio-tracking was carried out at least monthly, in 1989–1992.

Output references

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, terrestrial mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read latest volume: Volume 17

Go to the CE Journal

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust