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Plant–pollinator interactions in a Mexican Acacia community

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Abstract

Competition for pollination is thought to be an important factor structuring flowering in many plant communities, particularly among plant taxa with morphologically similar and easily accessible flowers. We examined the potential for heterospecific pollen transfer (HPT) in a community of four Acacia species in a highly seasonal tropical habitat in Mexico. Partitioning of pollen flow among sympatric species appears to be achieved, in part, through segregation of flowering in seasonal time, and interspecific differences in pollinator guilds. However, two coflowering species (Acacia macracantha and Acacia angustissima) shared multiple flower visitors, raising the possibility of HPT. Each of these coflowering species showed high intraspecific daily synchrony in pollen release, but dehisce at different times of day. Pollinators rapidly harvested available pollen from one species before abandoning it to visit the flowers of the second later in the day. The activity of shared pollinators, predominantly bees, is thus structured throughout the day, and potential for HPT reduced. Suggestive evidence in favour of a resource partitioning explanation for this pattern is provided by the fact that A. macracantha showed significantly greater intraspecific synchrony when coflowering with a potential competitor (A. angustissima) than when flowering alone. We discuss our results in light of previous work on coflowering acacia assemblages in Tanzania and Australia.

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Notes

  1. Recent evidence suggesting the genus Acacia is polyphyletic has lead to calls for a significant taxonomic revision (Maslin 2006). The names (Vachellia and Acaciella) given in parentheses indicate the genera to which these species would be assigned under the proposed revision (Maslin et al. 2003)

  2. Flower heads have often been termed ‘inflorescences’, although as defined by the Flora of Australia (vol. 11A, Mimosaceae, Acacia), the term ‘inflorescence’ more properly applies to groups of flower heads on a floral shoot. For clarity we use the term flower head throughout.

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Acknowledgements

We would like to thank Miguel Franco, Graham Floater, Tim Jones, Rubén Pérez, and Juan Ramón Zárate for their considerable help in México, Paul Johnson, George McGavin, David Raubenheimer, David Roberts and Steve Simpson for their assistance in Oxford, and the Estación de Biologia de Chamela IBUNAM for permission to conduct research. Thanks to Ricardo Ayala-Barajas, Felipe Noguera-Martínez, Alicia Rodriguez-Palafox and Arturo Solís-Magallanes for their invaluable taxonomic expertise, and to Mike Raine and two anonymous referees for comments on earlier versions of this manuscript. We are particularly grateful to Rosario ‘Chayo’ Velasco-Aceuedo and everyone at El Tejaban for sustaining the project. NER was supported by a postgraduate studentship from the William Edward’s Educational Charity, Kenilworth, a Varley-Gradwell fellowship from the Department of Zoology, University of Oxford, and Magdalen College, Oxford. GNS was supported by grants from the NERC (GR9/03553) and the Royal Society. This work was supported by the E.P.A. Cephalosporin Fund, the Percy Sladen Memorial Fund c/o Linnean Society of London and Acacia Bank California.

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Raine, N.E., Pierson, A.S. & Stone, G.N. Plant–pollinator interactions in a Mexican Acacia community. Arthropod-Plant Interactions 1, 101–117 (2007). https://doi.org/10.1007/s11829-007-9010-7

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