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Providing evidence to improve practice

Action: Physically protect nests with individual exclosures/barriers or provide shelters for chicks of storks and ibises Bird Conservation

Key messages

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A randomised, replicated and controlled study from Cambodia found that giant ibis Thaumatibis gigantean fledgling rates were higher for nests in protected trees than controls.

 

Supporting evidence from individual studies

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A randomised, replicated and controlled study from 2004-2006 in northern Cambodia (Keo et al. 2009) found daily survival rates of nests during the nestling period and average fledging rates were significantly higher for 24 giant ibis Thaumatibis gigantea nests in trees fitted with predator exclusion devices (an 80 cm wide strip of hard, smooth plastic, fitted at least 1.5 m from the ground) than for 28 nests in unprotected trees (daily survival rates of 99.9% for protected vs. 99.3% for unprotected nests, leading to overall survival rates of 90% vs. 61% respectively; and average fledging rates of 1.9 chicks/nest vs. 1.25 chicks/nest respectively). Protected trees were also more likely to be re-used in the next year (73% vs. 9%, 22 trees monitored).

 

Referenced papers

Please cite as:

Williams, D.R., Child, M.F., Dicks, L.V., Ockendon, N., Pople, R.G., Showler, D.A., Walsh, J.C., zu Ermgassen, E.K.H.J. & Sutherland, W.J. (2019) Bird Conservation. Pages 141-290 in: W.J. Sutherland, L.V. Dicks, N. Ockendon, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2019. Open Book Publishers, Cambridge, UK.