Effects of insecticide treatment on tick numbers and nesting success of brown pelicans Pelecanus occidentalis at two breeding colonies in Charleston County, South Carolina, USA

  • Published source details Eggert L.M.F. & Jodice P.G.R. (2008) Growth of brown pelican nestlings exposed to sublethal levels of soft tick infestation. The Condor, 110, 134-142


This study is summarised as evidence for the following.

Action Category

Remove ectoparasites from nests to increase survival or reproductive success

Action Link
Bird Conservation
  1. Remove ectoparasites from nests to increase survival or reproductive success

    A randomised, replicated and controlled trial at two brown pelican Pelecanus occidentalis colonies in South Carolina, USA (Eggert & Jodice 2008) found that treating pelican nests with insecticide (175 ml of a 0.5% dilution of Rabon® 50 WP sprayed on to nests) significantly reduced the number of ticks Carios capensis on pelican chicks compared to control nests at one colony in 2004 but not on the other (Marsh Island: 1.1 ticks/chick for 45 treated chicks vs. 10.4 ticks/chick for 50 untreated chicks; Crab Bank: 0.01 ticks/chick for 48 treated chicks vs. 0.1 ticks/chick for 50 untreated nests). There were no differences in tick burden between treatment and control nests in 2005. There were also no differences between treatment and control nests in terms of survival of chicks to 21 days or chick growth rates.


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