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Fledging Success in Experimentally Manipulated Broods of House Wrens

Todd W. Arnold
The Wilson Bulletin
Vol. 105, No. 3 (Sep., 1993), pp. 448-454
Stable URL: http://www.jstor.org/stable/4163319
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Fledging Success in Experimentally Manipulated Broods of House Wrens
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Abstract

I manipulated brood size in a population of box-nesting House Wrens (Troglodytes aedon) to determine if fledging success was limited by the ability of parents to provision nestlings. Enlarged broods produced significantly more fledged young than did control or reduced broods, but fledglings from enlarged broods weighed 6-7% less than fledglings from other broods. Fledging success was unrelated to original clutch size, but parents that laid large clutches fledged heavier offspring. These results do not support the brood-provisioning hypothesis. Brood size in House Wrens may be limited by post-fledging survival or interseasonal costs of reproduction, but I was unable to assess these factors in this study.

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