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- W2328441423 abstract "To examine the hypothesis that the growth rates of emberizines are physiologically maximized and hence geographically invariant, we weighed the eggs and nestlings of White-crowned Sparrows (Zonotrichia leucophrys) from subarctic, subalpine, and low-altitude montane populations. We augmented these data with published information on another subalpine population and a Pacific maritime population. Clutch sizes ranged from a mode of three in the south to five in the north. Geographic variation in fresh egg weight was closely correlated with the size of the adult female. Other sources of variation, if any, were small. The mean incubation period was geographically invariant (about 12.2 d). The weight (water) loss of eggs during incubation averaged 18.4%, without statistically significant differences among four localities. There were no consistent differences in the synchrony of hatching in clutches of three, four or five eggs. Runt nestlings resulting from late hatching were atypical in the mainly five-egg clutches in the subarctic, but were more common in the unusual five-egg clutches of subalpine populations. The postnatal growth curves of nestlings in all six sample populations were virtually congruent, and thus independent of mean brood size and locality. We believe that it is unlikely that this would occur in such diverse populations unless growth rate were physiologically maximized. We would expect to find greater diversity if growth rates were submaximal and optimized in relation to the local environment." @default.
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- W2328441423 date "1981-11-01" @default.
- W2328441423 modified "2023-10-14" @default.
- W2328441423 title "Comparative Patterns of Nestling Growth in White-Crowned Sparrows" @default.
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- W2328441423 doi "https://doi.org/10.2307/1367507" @default.
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