Reduced predation by nest box relocation: differential effect on Tengmalm's owl nests and artificial nests

  • Published source details Sonerud G.A. (1993) Reduced predation by nest box relocation: differential effect on Tengmalm's owl nests and artificial nests. Ornis Scandinavica, 24, 249-253.


This study is summarised as evidence for the following.

Action Category

Reduce predation by translocating nest boxes

Action Link
Bird Conservation
  1. Reduce predation by translocating nest boxes

    A small, randomised and controlled cross-over study from 1975-1990 in boreal forest in southeast Norway (Sonerud 1993) found that relocated Tengmalm’s owl Aegolius funereus nest boxes were predated less by European pine martins Martes martes than unmoved boxes. Nest boxes moved in 1983 by 50-200 m suffered significantly lower predation in 1984-5, compared to before relocation (1975-83), or to control (unmoved) boxes (40% of five nests predated after relocation vs. 100% of 13 nests before and 83% of six controls). Treatments were reversed in 1988-90: the 14 control boxes moved by 110-370 m and previously moved boxes were kept in the same place. Predation rates on newly moved boxes fell (0% predation for four nests after relocation vs. 77% for 22 nests in 1975-85). No statistical comparison was possible with boxes moved in 1983, as only two nesting attempts were made in 1988-90 (of which one was predated).


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