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Reproductive Biology of Asteraceae on Oceanic Islands

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Abstract

Asteraceae are among the most abundant angiosperm families on oceanic islands. The reproductive biology of Asteraceae is reviewed and the attributes of the family contributing to their success on islands are discussed. Asteraceae are effective dispersers (the small, single-seeded fruits are moved great distances by wind and birds), and colonization is most likely limited by establishment. The pollinators of the colonizing ancestors rarely disperse with them to islands. Divorced from the pollinators of their ancestral habitats, the capitulum of aggregated small, shallow flowers typical of Asteraceae facilitates pollination of colonizers by various novel biotic visitors and by wind. Self-compatible (SC) colonizing ancestors are common, permitting establishment of sexual populations from one or few propagules. However, several large insular lineages of Asteraceae originated from functionally self-incompatible (SI) colonizers that may have also possessed the capacity to set some self-seed. Establishment may also be facilitated by dominance relationships among S-alleles in the sporophytic SI (SSI) system of Asteraceae, increasing cross-compatibility within small populations. Factors potentially promoting outcrossing in SC Asteraceae are: gynomonoecy, with temporal separation of receptive pistillate ray florets and pollen presentation in the hermaphroditic disc florets of a capitulum (interfloral protogyny); and intrafloral protandry where pollen presentation occurs before stigmata become receptive. Dioecy, gynodioecy, and monoecy are infrequent sexual systems in insular Asteraceae. Multiple paternity is similar in island composites to other Asteraceae, suggesting that neither compatible mates nor pollinators are typically limiting. Additional studies, particularly with genomic markers, are needed for more refined insights into mating systems and paternity in island Asteraceae as these results have important conservation implications.

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Acknowledgements

DJC and JKK were supported by The College of Liberal Arts and Sciences and the Department of Ecology and Evolutionary Biology at the University of Kansas for studies of island plants; GJA received multiple forms of support from the Department of Ecology and Evolutionary Biology at the Univ. of Connecticut for studies of the reproductive biology of plants from oceanic archipelagos; grants from NSF and NIH to JKK facilitated research on plant mating systems and paternity. We appreciate the constructive comments of two anonymous reviewers.

Attribution for figures: Gilbert Ortiz executed several figures. Unless otherwise indicated in figure captions, photos were supplied by the authors. We thank Jenny Archibald, David Eickhoff, John Game, Tod Stuessy and Pablo Vargas for kindly providing plant images.

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  1. Department of Ecology & Evolutionary Biology, University of Kansas and Biodiversity Institute, University of Kansas, Lawrence, KS, 66045-7534, USA

    Daniel J. Crawford

  2. Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, KS, 66045-7534, USA

    John K. Kelly

  3. Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, 06269-3043, USA

    Gregory J. Anderson

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DJC had conceived the article, did initial literature searches, and produced initial draft of manuscript. GJA and JKK read subsequent drafts of the manuscript, suggested substantive additions and revisions, and provided additional literature references. All authors approved the final version of the manuscript.

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Appendix

Appendix

Table 1 Reproductive attributes of endemic and native Asteraceae from selected oceanic archipelagos, with relevant references and websites
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Crawford, D.J., Kelly, J.K. & Anderson, G.J. Reproductive Biology of Asteraceae on Oceanic Islands. Bot. Rev. 90, 67–108 (2024). https://doi.org/10.1007/s12229-023-09295-9

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