Variation in Predispersal Losses in Reproductive Potential in Rowan (Sorbus aucuparia L. Rosaceae) in the NW Iberian Peninsula

We identified the principal factors causing losses in reproductive potential (i.e. quantity of potentially dispersable seeds) over the predispersal period of the reproductive cycle of Sorbus aucuparia L. (Rosaceae) in various populations in the NW Iberian Peninsula. Over the period 1999-2002 we exam...

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Bibliographic Details
Published in:Plant ecology 2007-02, Vol.188 (2), p.191-203
Main Authors: Pías, Beatriz, Salvande, Miguel, Guitián, Pablo
Format: Article
Language:English
Subjects:
Buds
Flower buds
Flowers
Fruit production
Fruit set
Fruits
Plant ecology
Plant-animal interactions
Plants
Pollen
Pollination
Predators
Predispersal biology
Reproductive cycle
Reproductive potential
Rosaceae
Seed predation
Seed production
Seeds
Sorbus aucuparia
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Summary:We identified the principal factors causing losses in reproductive potential (i.e. quantity of potentially dispersable seeds) over the predispersal period of the reproductive cycle of Sorbus aucuparia L. (Rosaceae) in various populations in the NW Iberian Peninsula. Over the period 1999-2002 we examined the magnitude and variability of losses observed in each stage from bud production to seed production (i.e. bud to flower, flower to initiated fruit, initiated to full-size fruit, and full-size to mature fruit). We also investigated spatial and temporal variation in these losses. Reproductive potential showed very significant losses over the predispersal period in all 4 years: in no case did the number of mature fruits available for dispersal exceed 20% of the initial number of flower buds. In all 4 years of study, we detected statistically significant variation among populations in total losses. The principal cause of loss of reproductive potential over the predispersal period in our Sorbus aucuparia populations was non-initiation of fruit. The plant's interactions with predispersal predators of buds and seeds show high spatial and temporal variability. Also, the proportions of loss due to the different components did not show within-individual consistency over time. It thus seems unlikely that the different factors contributing to predispersal losses in rowan are currently generating significant selective pressures in our study populations.
ISSN:1385-0237
1573-5052
DOI:10.1007/s11258-006-9156-x