fig 1 - Protein Requirements of an Omnivorous and a Granivorous Songbird Decrease During Migration

Average changes in body mass, food intake, and nitrogen (N) balance in Hermit Thrushes and White-throated Sparrows in the nonmigratory state (n = 20 and n = 22, respectively) that ingested different amounts of protein. Brackets along the x-axis show the four dietary protein groups (3.6%, 6.7%, 9.7%, and 12.8%) that were used to produce this range in dietary N intake. Changes in N balance as a function of N intake by Hermit Thrushes and White-throated Sparrows are described by the equations y = 0.430x − 22.82 (R 2 = 0.75, n = 20) and y = 0.358x − 16.44 (R 2 = 0.63, n = 22), respectively. (A) Horizontal shaded area depicts the average (± 90% confidence interval [CI]) change in body mass of birds in steady state (Hermit Thrush, n = 20; White-throated Sparrow, n = 22) during the 14 days prior to the start of total-collection trials. Horizontal dashed lines and surrounding shaded area depict (B and E) food intake and (C and F) N balance (± 90% CI) of birds in the nonmigratory state that consumed adequate dietary protein (≥9.7% protein) during the total-collection trials.

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Protein Requirements of an Omnivorous and a Granivorous Songbird Decrease During Migration - Scientific Figure on ResearchGate. Available from: https://www.researchgate.net/figure/Average-changes-in-body-mass-food-intake-and-nitrogen-N-balance-in-Hermit-Thrushes_fig2_239732176 [accessed 21 May 2025]

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fig. 1. Average changes in body mass, food intake, and nitrogen (N) balance in Hermit Thrushes and White-throated Sparrows in the nonmigratory state (n = 20 and n = 22, respectively) that ingested different amounts of protein. Brackets along the x-axis show the four dietary protein groups (3.6%, 6.7%, 9.7%, and 12.8%) that were used to produce this range in dietary N intake. Changes in N balance as a function of N intake by Hermit Thrushes and White-throated Sparrows are described by the equations y = 0.430x − 22.82 (R 2 = 0.75, n = 20) and y = 0.358x − 16.44 (R 2 = 0.63, n = 22), respectively. (A) Horizontal shaded area depicts the average (± 90% confidence interval [CI]) change in body mass of birds in steady state (Hermit Thrush, n = 20; White-throated Sparrow, n = 22) during the 14 days prior to the start of total-collection trials. Horizontal dashed lines and surrounding shaded area depict (B and E) food intake and (C and F) N balance (± 90% CI) of birds in the nonmigratory state that consumed adequate dietary protein (≥9.7% protein) during the total-collection trials.

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<a href="https://www.researchgate.net/figure/Average-changes-in-body-mass-food-intake-and-nitrogen-N-balance-in-Hermit-Thrushes_fig2_239732176"><img src="https://www.researchgate.net/profile/Scott-Mcwilliams-2/publication/239732176/figure/fig2/AS:667857302061063@1536240997561/Average-changes-in-body-mass-food-intake-and-nitrogen-N-balance-in-Hermit-Thrushes.png" alt="Average changes in body mass, food intake, and nitrogen (N) balance in Hermit Thrushes and White-throated Sparrows in the nonmigratory state (n = 20 and n = 22, respectively) that ingested different amounts of protein. Brackets along the x-axis show the four dietary protein groups (3.6%, 6.7%, 9.7%, and 12.8%) that were used to produce this range in dietary N intake. Changes in N balance as a function of N intake by Hermit Thrushes and White-throated Sparrows are described by the equations y = 0.430x − 22.82 (R 2 = 0.75, n = 20) and y = 0.358x − 16.44 (R 2 = 0.63, n = 22), respectively. (A) Horizontal shaded area depicts the average (± 90% confidence interval [CI]) change in body mass of birds in steady state (Hermit Thrush, n = 20; White-throated Sparrow, n = 22) during the 14 days prior to the start of total-collection trials. Horizontal dashed lines and surrounding shaded area depict (B and E) food intake and (C and F) N balance (± 90% CI) of birds in the nonmigratory state that consumed adequate dietary protein (≥9.7% protein) during the total-collection trials."/></a>