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

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Abstract

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.

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Acknowledgements

Carlos Herrera, José Guitián and Anna Traveset made useful comments on previous versions of the manuscript. Adrián Escudero helped with the statistical analysis. Two anonymous referees made useful comments to a previous version of the paper. During most of this work, B. Pías and M. Salvande were supported by predoctoral grant (FP98-78789092 to BP and AP97-33299901 to MS) by the Spanish Ministerio de Educación y Ciencia. All the investigations described here are included in projects PB97-0516 (1999–2001) by Spanish Ministerio de Educación y Ciencia and BOS2001-3267 (2002–2004) by Spanish Ministerio de Ciencia y Tecnología. We thank Guy Norman for English translation.

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Authors and Affiliations

  1. Departamento de Botánica, Facultade de Farmacia, Universidade de Santiago de Compostela, Campus sur s/n, E-15782, Santiago de Compostela, Spain

    Beatriz Pías & Pablo Guitián

  2. Departamento de Bioloxía Celular e Ecoloxía, Facultade de Bioloxía, Universidade de Santiago de Compostela, Campus sur s/n, E-15782, Santiago de Compostela, Spain

    Miguel Salvande

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  1. Beatriz Pías
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Correspondence to Beatriz Pías.

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Pías, B., Salvande, M. & Guitián, P. Variation in Predispersal Losses in Reproductive Potential in Rowan (Sorbus aucuparia L. Rosaceae) in the NW Iberian Peninsula. Plant Ecol 188, 191–203 (2007). https://doi.org/10.1007/s11258-006-9156-x

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