House sparrow response to monofilament lines at nest boxes and adjacent feeding sites

  • Published source details Pochop P., Johnson R. & Eskridge K. (1993) House sparrow response to monofilament lines at nest boxes and adjacent feeding sites. The Wilson Bulletin, 105, 504-513.


This study is summarised as evidence for the following.

Action Category

Protect nest sites from competitors

Action Link
Bird Conservation
  1. Protect nest sites from competitors

    A replicated, controlled study in 1990-1991 in 73 experimental and 73 control nestboxes in Nebraska, USA (Pochop et al. 1993) found that, in 1990, house sparrows Passer domesticus (an introduced species) delayed nesting in nestboxes that had three monofilament wires (37 cm apart) held in front of nest boxes on wire ‘prongs’, resulting in a shorter breeding period (broods started an average of 25 days earlier in control boxes).  The modified nest boses also resulted in fewer successful clutches compared to control boxes (29% of experimental boxes with successful clutches vs. 53% of controls). However, in 1991, there were no such differences, (65% of 60 control clutches successful vs. 55-70% for 120 experimental boxes). All box types were used for roosting over winter.


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