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Survivorship of captive-bred and wild-caught reintroduced European otters Lutra lutra in Sweden

Survivorship of captive-bred and wild-caught reintroduced European otters Lutra lutra in Sweden,10.1016/0006-3207(95)00097-6,Biological Conservation,T

Survivorship of captive-bred and wild-caught reintroduced European otters Lutra lutra in Sweden   (Citations: 12)
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Eleven wild-caught otters from Norway and 25 captive-bred otters from Sweden equipped with radio transmitters were reintroduced in an area in south central Sweden between 1989 and 1992. The objectives of the study were to compare the survival rate in the two groups, and to examine possible factors associated with differences in the survival rate. The survival rate one year after release was 79% in wild-caught otters and 42% in captive-bred otters. In captive-bred otters the period between removal from their mother and their release varied from 5 to 98 days. The offspring with short separation release periods had a significantly higher survival rate than those with long separation periods.
Journal: Biological Conservation - BIOL CONSERV , vol. 76, no. 2, pp. 161-165, 1996
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    • ...The fate of the 47 otters released at Release site 1 (Figure 1) was monitored by telemetry (Sjöåsen 1996a) and field surveys (Sjöåsen 1996b)...
    • ...These otters originally were from the north of Norway, either wild-caught or captive-bred (Sjöåsen 1996a)...
    • ...Telemetric data have shown that the survivorship of the released otters one year later was 54% (Sjöåsen 1996a)...
    • ...There were also strong indications of two released females reproducing (Sjöåsen 1996a)...
    • ...Although half of the group of released otters survived after one year and some reproduced successfully (Sjöåsen 1996a), the genetic effects are restricted to areas directly surrounding the release site, such as SA2, yet even in these regions the releases may not have been able to completely stop the loss of genetic diversity by drift (Table 3). In regions more distant from the release sites, such as SA1, the loss of genetic ...

    Johanna Arrendalet al. Genetic evaluation of an otter translocation program

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