Variation in the structure of bird nests between northern Manitoba and southeastern Ontario.

Nests of Yellow Warblers ( t = −2.648, P = 0.01) in northern Manitoba had thicker walls than those in southeastern Ontario, and this pattern approached significance in Carduelis finches ( t = −1.749, P = 0.09).

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In all cases where we measured nests multiple times, repeated measures of individual nests were highly correlated and highly significant (intraclass correlation coefficient for consistency in repeated measures of nest-wall thickness for: American Robin 0.74, F 8,36 = 15.0; Carduelis 0.75, F 8,36 = 16.2, Yellow Warbler 0.97, F 9,40 = 182; P <0.00001 for all three groups [33] ), suggesting that our nest measures for each nests were highly consistent.

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Nest-wall thickness did not differ significantly between sites for American Robins ( t = −1.386, P = 0.18) and Savannah Sparrows ( t = 1.285, P = 0.21); robins showed a trend for thicker nest walls in northern Manitoba, while the sparrows showed the opposite pattern ( Fig. 3 ).

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