Whitening of the last eggs to be laid in Russet Sparrow clutches. a, b, and c are three clutches of Russet Sparrow eggs, respectively, placed from left to right according to their laying orders. Photo by Juan Huo

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Whitening of the last eggs to be laid in Russet Sparrow clutches. a, b, and c are three clutches of Russet Sparrow eggs, respectively, placed from left to right according to their laying orders. Photo by Juan Huo

2018, 9(1): 21.

Last but not the least: effects of laying sequence on egg color variation and embryonic development of Russet Sparrow (Passer cinnamomeus) .

Figures of the Article

The nest box used and a male Russet Sparrow. Photo by Bruce Lyon
Whitening of the last eggs to be laid in Russet Sparrow clutches. a, b, and c are three clutches of Russet Sparrow eggs, respectively, placed from left to right according to their laying orders. Photo by Juan Huo
Background reflectance of Russet Sparrow eggs. G1 refers to first group, the first eggs to be laid, G2 to middle group, the intermediate eggs in the sequence, and G3 to last group, the last eggs in each clutch. Back means eggshell background color, spot means eggshell spot color
Embryonic heart rates of Russet Sparrow. Linear and cubic models were used in regression analysis showing that a regression curve was the best fit for the heart rate change in the first egg group and the poorest in the last egg group
Incubation period and development time of Russet Sparrow. Development time was a subset of incubation period and was the interval between the first detection of a heart beat and hatching. The lower case letters a and b refer to the results of the LSD (Least Significant Difference) test. The difference between first and last groups was highly significant

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