Study

Survival rates and range sizes of aplomado falcons Falco femoralis hacked at a wetland site in Texas, USA

  • Published source details Perez C.J. & Zwank P. (1996) Survival, movements and habitat use of aplomado falcons released in southern Texas. Journal of Raptor Research, 30, 175-182

Actions

This study is summarised as evidence for the following.

Action Category

Release captive-bred individuals into the wild to restore or augment wild populations of raptors

Action Link
Bird Conservation
  1. Release captive-bred individuals into the wild to restore or augment wild populations of raptors

    A replicated study in 1993-4 (Perez & Zwank 1996) found that four-week survival rates of captive-bred aplomado falcons Falco femoralis hacked at a wetland site in southern Texas, USA, ranged from 58% (five known mortalities from 12 birds released in 1994) to 85% (four known mortalities from 26 birds released in 1993). Predation by great horned owls Bubo virginianus and coyotes were the main causes of mortality. Released birds had larger range sizes than predicted, which the authors suggest is due to birds having expanded ranges before pairing up. Birds were transported to the release site when four weeks old and fed there before being released at 37 days old. Food was then provided until birds no longer returned to feed.

     

Output references

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