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- W2328857778 abstract "The purpose of this study was to examine Lack's (1947, 1954) brood-reduction hypothesis concerning hatching asynchrony, and its importance in explaining the evolution of hatching asynchrony in Yellow Warblers (Dendroica petechia). The study was conducted during the summers of 1988-1990 on a population of Yellow Warblers breeding in the dune-ridge forest at Delta Marsh, Manitoba, Canada (58°11′N, 98°19′W). I examined the brood-reduction hypothesis experimentally by inducing a sample of females to delay incubation until clutch completion. This was achieved by removing eggs as they were laid, and placing them in a cooler at 20°C until clutch completion. As a result, eggs in each manipulated clutch hatched synchronously (hatch spread between first- and last-hatched nestling ≤24 hr). Subsequently, I compared the fledging mass and survival rate of nestlings in asynchronously (unmanipulated broods, hatch spread >24 hr) and synchronously (manipulated) hatching broods. Consistent with the hypothesis, nestling mortality was concentrated in last-hatched nestlings in asynchronous broods and random with respect to hatch order in synchronous broods. Also in agreement with the hypothesis, fledging mass and survival rates of first-hatched chicks were generally higher in asynchronous broods. However, contrary to the hypothesis, fledging mass and survival rates were similar for last-hatched chicks in asynchronous and synchronous broods. Also consistent with the hypothesis, fledging success (no. fledged/clutch) in broods of five tended to be higher in asynchronously hatched broods, regardless of food availability. Finally, fledging rate (no. fledged/no. hatched) was significantly greater in asynchronous broods (four and five nestlings combined) when compared to synchronous broods, especially when food was limiting." @default.
- W2328857778 created "2016-06-24" @default.
- W2328857778 creator A5019122204 @default.
- W2328857778 date "1993-05-01" @default.
- W2328857778 modified "2023-10-17" @default.
- W2328857778 title "An Experimental Study of Brood Reduction and Hatching Asynchrony in Yellow Warblers" @default.
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- W2328857778 doi "https://doi.org/10.2307/1369358" @default.
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