Providing evidence to improve practice

Action: Alter artificial nest sites to discourage brood parasitism

Key messages

A replicated trial from Puerto Rico found that brood parasitism levels were extremely high across all nest box designs tested.

 

Supporting evidence from individual studies

1 

A replicated trial in 1980 in Puerto Rico (Wiley et al. 1991) found that, shiny cowbirds Molothrus bonariensis parasitised yellow-shouldered blackbird Agelaius xanthomus nests in all 16 nest box types tested with 96% of 103 nests parasitised. The effect of cowbird control is discussed in ‘Threat: Invasive and other problematic species - Remove/control brood parasites’.

 

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. (2017) Bird Conservation. Pages 95-244 in: W.J. Sutherland, L.V. Dicks, N. Ockendon & R.K. Smith (eds) What Works in Conservation 2017. Open Book Publishers, Cambridge, UK.