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- W2331025023 abstract "(1) Broods of the magpie Pica pica (L.), in an urban habitat in Norway, were manipulated to test the brood reduction hypothesis. According to this theory parents adjust their brood size to the maximum number of young which they are capable of rearing by allowing the smallest nestlings to die. (2) I created three groups of nests: (i) nests where all nestlings that died between hatching and 7 days of age were replaced (n = 10), (ii) unmanipulated control nests (n = 26), and (iii) nests with nestlings experimentally removed (n = 5). (3) During the period between the time of nest manipulation and just before fledging (nestlings about 24 days old) no differences were found in either growth or survival rates in the three groups of nests. (4) After fledging the mortality rate was higher in the nests in which nestlings were replaced (mean brood size declined from 4-0 fledglings to 1.1 young when they were independent of their parents, at about 80 days old) than in either the control group (3-2 declined to 1.6 young) or the nests where nestlings were removed (2-2 declined to 1.4 young). (5) No correlation was found between brood size at 24 days of age and the survival rate during the subsequent period up to the time of parental independence either in control nests or in nests with nestlings removed. In nests with dead nestlings experimentally replaced there was a significantly lower after-fledging rate in the larger broods (r = -0.60, n = 9, P = 0-05). (6) Thus, the results support the brood reduction hypothesis that early nestling mortality is an adaptive strategy." @default.
- W2331025023 created "2016-06-24" @default.
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- W2331025023 date "1986-02-01" @default.
- W2331025023 modified "2023-09-27" @default.
- W2331025023 title "On the Adaptive Value of Brood Reduction in Birds: Experiments with the Magpie Pica pica" @default.
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- W2331025023 doi "https://doi.org/10.2307/4693" @default.
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