Individual study: Effect of individual origin on migratory behaviour of captive-reared little bustards Tetrax tetrax released in Deux Sèvres, Poitou-Charentes, France
Villers A., Millon A., Jiguet F., Lett J.-M., Attie C., Morales M.B. & Bretagnolle V. (2010) Migration of wild and captive-bred little bustards Tetrax tetrax: releasing birds from Spain threatens attempts to conserve declining French populations. Ibis, 152, 254-261
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Use appropriate populations to source released populations
A small study in southern France and Spain in 1997-2007 (Villers et al. 2010) found that six little bustards Tetrax tetrax originating in Spain but hand-reared and released in France did not migrate to Spain (with the possible exception of one bird that could not be tracked). By contrast, 13 out of 21 wild adults from France (62%) and six of eight hand-reared French chicks (75%) migrated. The authors conclude that hand-rearing does not affect migration probability, but that genetic origin appears to.