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- W1964448009 abstract "Floral display (the size, number, and arrangement of open flowers) influences pollinator visitation to animal‐pollinated plants and should be an important determinant of reproductive success. We examined variation in the size and number of open flowers in wild daffodils (Narcissus). Our analysis of published data on 45 taxa showed that flower number varied negatively with flower diameter among Narcissus species, which supports the widespread assumption that there is a trade‐off between these traits. In contrast, field measurements indicated a positive relation between flower number and diameter within two populations of Narcissus dubius, and no relation was evident after we controlled for variation in bulb size. The discrepancy between inter‐ and intraspecific patterns may have occurred because variable resource levels obscure trade‐offs when variation in flower size is low (e.g., within species). Size‐related increases in floral tube length were half as great as corresponding increases in flower diameter, a result that is consistent with stronger stabilizing selection on tube length. Staggered flowering within N. dubius inflorescences limited the mean number of open flowers to <66% of total flower number, and slow expansion by later opening flowers resulted in significant differences in flower size throughout flowering. Although pollinators preferred large flowers, experimental reductions in flower diameter did not affect seed production. Our results illustrate how the relative importance of the factors influencing floral display can vary among levels of biological organization. Interspecific variation in flower size and number appeared to be constrained by allocation trade‐offs, but intraspecific variation in both traits was more greatly influenced by plant resource status. Within plants, the size and number of open flowers reflected the relative age of individual flowers and floral longevity." @default.
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- W1964448009 date "2000-01-01" @default.
- W1964448009 modified "2023-10-17" @default.
- W1964448009 title "Floral Display in<i>Narcissus</i>: Variation in Flower Size and Number at the Species, Population, and Individual Levels" @default.
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- W1964448009 doi "https://doi.org/10.1086/314225" @default.
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