Study

Supplementary feeding appears to promote early laying and larger clutch sizes in European kestrels Falco tinnunculus in the Netherlands

  • Published source details Dijkstra C., Vuursteen L., Daan S. & Masman D. (1982) Clutch size and laying date in the kestrel Falco tinnunculus: effect of supplementary food. Ibis, 124, 210-213

Actions

This study is summarised as evidence for the following.

Action Category

Provide supplementary food for raptors to increase reproductive success

Action Link
Bird Conservation
  1. Provide supplementary food for raptors to increase reproductive success

    A replicated controlled trial near wetlands in the northern Netherlands in 1978-80 (Dijkstra et al. 1982) found that European kestrel Falco tinnunculus pairs that were provided with supplementary food initiated clutches earlier and laid larger clutches than control (unfed) pairs in two out of three years (six fed pairs started laying on 6-17th April, average of 5.0-5.7 eggs/clutch vs. 8-10th May and 4.5-4.6 eggs/clutch for 30 controls). In 1980, the differences were far smaller (23rd April and 6 eggs/clutch for three fed pairs vs. 25th April and 5.6 eggs/clutch for 18 controls), possibly due to it being a peak vole year. Significance levels were not provided. Supplementary feeding consisted of 100-120 g of mouse meat every daily (approximately twice the daily needs of captive kestrels), provided from late January (1978) or early March (1979 and 1980) until the start of incubation in late April or early May.

     

Output references

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, terrestrial 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

Subscribe to our newsletter

Please add your details if you are interested in receiving updates from the Conservation Evidence team about new papers, synopses and opportunities.

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