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3743121422
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note
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To quantify departure schedules in the subsequent spring, we resighted color-banded redstarts on territory in both habitat types every 3 days from 1 April until 30 April in 1995 and until 15 May in 1996. If an individual was not relocated on a territory search, then that territory was revisited twice more within that 3-day period and once again in the next 3-day period with the use of song-chip playbacks.
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Boutton, T.W.2
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24
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3743127110
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note
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13C values of forest insects being more depleted [-25.8 ± 0.44 per mil (mean ± SE)] and insects from scrub territories more enriched (-24.2 ± 0.20 per mil).
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25
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27944469791
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3743122531
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note
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13C values of blood, muscle, and insect samples that were either treated with a 0.5 N HCl solution to remove carbonates or lipid extracted with a chloroform: methanol rinse, so we report here only those values based on replicate measurements of untreated blood, muscle, or insects.
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31
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3743069079
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note
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By controlling for the structural size of individuals and relating this to body mass, it is possible to assess the physical condition of birds. Redstarts with a body mass light for their structural size were considered in poor physical condition relative to those heavy for their structural size. To calculate mass corrected for structural size, we calculated the scores of a principal component analysis on the basis of wing chord, tarsus, and bill length, and then regressed body mass against these scores. The residuals from this regression estimate mass corrected for structural size and provide our index of physical condition.
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34
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Robbins, C.S.1
Sauer, J.R.2
Greenberg, R.3
Droege, S.4
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36
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3743132716
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note
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This research was funded through grants from the NSF and the Canadian Wildlife Service. We acknowledge the advice and suggestions of M. Ayres, J. Bates, D. Bolger, P. Chamberlain, R. Greenberg, S. Hackett, B. Kennedy, K. Marchetti, F. Moore, A. Perrault, T. Price, J. V. Remsen, T. Sherry, S. Sillett and two anonymous reviewers. S. van Wilgenburg assisted with sample preparation and G. Parry performed stable isotope analyses at the Department of Soil Science, University of Saskatchewan. We acknowledge the assistance and cooperation of the Natural Resources Conservation Authority of Jamaica, the Petroleum Corporation of Jamaica, and Pilar Thorn and the Corporation Hondurena de Desarrollo Forestal of Honduras.
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