Nestbox spacing (solitary versus crowded) affects the reproductive patterns of tree sparrows
Published source details
Sasvari L. & Hegyi Z. (2000) Sex-related local recruitment in colonial and solitary breeding European Tree Sparrows Passer montanus L.. Ibis, 142, 119-122
Published source details Sasvari L. & Hegyi Z. (2000) Sex-related local recruitment in colonial and solitary breeding European Tree Sparrows Passer montanus L.. Ibis, 142, 119-122
This study is summarised as evidence for the following.
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Provide artificial nesting sites for songbirds
A replicated, randomised study from March-August in 1986-93 in five sites within a suburban park containing 25 solitary (spaced 50 m apart) nest boxes and 25 colonial nest boxes (3-5 m apart) in Budapest, Hungary (Sasvari & Hegyi 2000), found that the reproductive patterns of tree sparrows Passer montanus were affected by nest box spacing. Most fledglings were produced by females that moved from colonial to solitary nests (an average of 0.2 fledglings/brood) and fewest by females that retained colonial nests in subsequent seasons (0.07 fledglings/brood). Overall, female fledglings were significantly more likely to have been hatched from solitary nests (65% of all females) whereas males were more frequent in colonial nest broods (67% of all males). Both female and male recruits were most likely to breed for the first time in colonial nests. The distance between colonial and solitary nest boxes within each study plot was 100 m. The distance between neighbouring study plots was 500 m.