Abstract
Water-vapor conductance was determined for 78 eggs of Black-billed Magpies (Pica pica) collected along an altitudinal gradient in north-central Colorado and south-eastern Wyoming (range 1,486-2,896 m). Conductance of magpie eggs to water vapor is a function of the number of eggs in nests at the time of collection, indicating that conductance may be related to the order in which an egg is laid. A statistical relationship between altitude and conductance of eggs in our samples probably is spurious, and we conclude that water-vapor conductance of eggs does not vary altitudinally within the geographic area encompassed by our study. The altitudinal decline in water-vapor conductance that has been reported for eggs of several other species of birds seems not to characterize eggs of magpies.
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