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- W2520512022 abstract "Bird eggs lose -15% of fresh mass up to pipping, an amount presumed optimal for hatching and hatchling quality. We hypothesized that mallard (Anas platyrhynchos) eggs incubated in elevated structures lose more mass than those in ground nests because virtually all mass is lost as diffusive water vapor and structures are well ventilated. We weighed eggs in structure and ground nests repeatedly during incubation and assessed hatching success in these nests. We fit a mixed-effects repeated-measures analysis of covariance model to repeated measures of egg mass. Nest type and stage of incubation influenced mass simultaneously. Eggs in structure nests initiated early and late in the nesting season lost 20.6 and 20.7% of their fresh mass, respectively, versus 15.3% for eggs in ground nests initiated late in the nesting season. Whereas hatching success in nests where ≥1 egg hatched was unaffected by nest type, hatching success in structure nests with > 12 eggs was less than for smaller clutches in structures. Although the literature suggests that excessive egg moisture loss can harm embryos and hatchlings, we believe that high nest success in structures assures recruitment gains unless post-hatch mortality is much greater than is typical of broods hatching from other nest sites. Comparative duckling survival studies would be prudent, as would innovations to reduce nest ventilation in elevated structures." @default.
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- W2520512022 date "2003-01-01" @default.
- W2520512022 modified "2023-09-24" @default.
- W2520512022 title "Mass loss from mallard eggs incubated in nest structures" @default.
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