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- W2029811209 abstract "Researchers have often assumed that the reproductive success of a plant increases with flower production. However, if predispersal seed predation also increases with flower production, this may counteract the increase in re - productive success expected with such increased flower production. To investigate this, we examined the effect of flower number and predispersal seed predation on seed production in two field populations of Cirsium purpuratum (Maxim.) Matsum. At both sites, the proportion of seeds or heads preyed upon per plant increased with the number of flowers (florets or heads) on each plant, while the proportion of mature seeds per plant was independent of flower number per plant. Based on these results, we predicted that an increased level of seed predation at the population level would reduce the annual flower production of each plant. The observed pattern of flower production supported this pre- diction. Our results suggest that increased flower production may not always improve plant reproductive success under the influence of predispersal seed predation. Resume : Les chercheurs ont souvent pris pour acquis que les succes de reproduction d'une plante augmentent avec la production de fleurs. Cependant, si la predation des graines avant dispersion augmente egalement avec la production de fleurs, ceci pourrait contrer l'augmentation du succes de reproduction attendu d'une telle augmentation de fleurs. Pour etudier cette question, les auteurs ont examine l'effet du nombre de fleurs et de la predation des graines avant disper- sion sur la production de graines, dans deux populations de Cirsium purpuratum (Maxim.) Matsum, sur le terrain. Sur les deux sites, la proportion de graines ou d'inflorescences subissant la predation par plante augmente avec le nombre de fleurs (fleurons ou inflorescences) sur chaque plante, alors que la proportion de graines matures par plante est inde- pendante du nombre de fleurs par plante. Sur la base de ces resultats, les auteurs predisent qu'un augmentation de l'intensite de la predation des graines au niveau de la population reduira la production annuelle de fleur par plant. Le patron de production des fleurs observe supporte cette prediction. Les resultats suggerent qu'une augmentation de la production des fleurs n'ameliore pas toujours le succes de reproduction, sous l'influence d'une predation des graines avant la dispersion. Mots cles : succes reproductif des plantes, predation des graines avant dispersion, Cirsium purpuratum, production de fleurs, interaction plantes-animaux. (Traduit par la Redaction) Ohashi and Yahara 236" @default.
- W2029811209 created "2016-06-24" @default.
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- W2029811209 date "2000-01-01" @default.
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- W2029811209 title "Effects of flower production and predispersal seed predation on reproduction in <i>Cirsium purpuratum</i>" @default.
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