Anthelminthic treatment negatively affects chick survival in the Eurasian oystercatcher Haematopus ostralegus

  • Published source details Van Oers K., Heg D. & Le Drean Quenec'hdu S. (2002) Anthelminthic treatment negatively affects chick survival in the Eurasian oystercatcher Haematopus ostralegus. Ibis, 144, 509-517.


This study is summarised as evidence for the following.

Action Category

Remove/treat endoparasites and diseases

Action Link
Bird Conservation
  1. Remove/treat endoparasites and diseases

    A randomised, replicated and controlled trial in 1996 on an island in the northern Netherlands (Van Oers et al. 2002) found that fledging success of Eurasian oystercatcher Haematopus ostralegus broods was significantly lower when chicks were treated with anthelminthic drugs, compared to controls (18-20% success for treated broods vs. 29-38% for controls). This was despite there being no significant differences in clutch size or hatching success between groups and treated hatchlings having significantly lower incidence of gut parasites (41% of 17 treated chicks infected vs. 60% of 20 untreated chicks). The authors suggest that interference with chicks’ immune systems could have driven this pattern.


Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 18

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust