Study

Nest boxes enhance yellow-shouldered blackbird Agelaius xanthomus fledging success at Boquerón Forest, Puerto Rico

  • Published source details Wiley J.W., Post W. & Cruz A. (1991) Conservation of the yellow-shouldered blackbird Agelaius xanthomus, an endangered West Indian species. Biological Conservation, 55, 119-138

Actions

This study is summarised as evidence for the following.

Action Category

Alter artificial nest sites to discourage brood parasitism

Action Link
Bird Conservation

Remove/control adult brood parasites

Action Link
Bird Conservation
  1. Alter artificial nest sites to discourage brood parasitism

    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’.

     

  2. Remove/control adult brood parasites

    A replicated trial in 1980 in Puerto Rico (Wiley et al. 1991) as part of the same study as in (López-Ortiz et al. 2002 and López-Ortiz et al. 2006) found that parasitism of yellow-shouldered blackbird Agelaius xanthomus nests was significantly lower in two mangrove forest sites where shiny cowbirds Molothrus bonariensis were removed, compared to sites where cowbirds were not removed (45% of 11 nests parasitized where all cowbirds were removed vs. 30% of ten where female cowbirds were removed; 67% of nine where males were removed and 92%  of 12 in control sites). This study also investigated the impact of different nest boxes on parasitism, discussed in ‘General responses to small/declining populations - Provide artificial nesting sites’.

     

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 17

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