Floral isolation betweenAquilegia formosaandAquilegia pubescens

Abstract

Restricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Fulton Michelle and Hodges Scott A 1999Floral isolation between Aquilegia formosa and Aquilegia pubescensProc. R. Soc. Lond. B.2662247–2252http://doi.org/10.1098/rspb.1999.0915SectionRestricted accessFloral isolation between Aquilegia formosa and Aquilegia pubescens Michelle Fulton Michelle Fulton Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106, USA Google Scholar Find this author on PubMed Search for more papers by this author and Scott A Hodges Scott A Hodges Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106, USA [email protected] Google Scholar Find this author on PubMed Search for more papers by this author Michelle Fulton Michelle Fulton Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106, USA Google Scholar Find this author on PubMed Search for more papers by this author and Scott A Hodges Scott A Hodges Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106, USA [email protected] Google Scholar Find this author on PubMed Search for more papers by this author Published:22 November 1999https://doi.org/10.1098/rspb.1999.0915AbstractThe acquisition of floral nectar spurs is correlated with increased species diversity across multiple clades. We tested whether variation in nectar spurs influences reproductive isolation and, thus, can potentially promote species diversity using two species of Aquilegia, Aquilegia formosa and Aquilegia pubescens, which form narrow hybrid zones. Floral visitors strongly discriminated between the two species both in natural populations and at mixed-species arrays of individual flowers. Bees and hummingbirds visited flowers of A. formosa at a much greater rate than flowers of A. pubescens. Hawkmoths, however, nearly exclusively visited flowers of A. pubescens. We found that altering the orientation of A. pubescens flowers from upright to pendent, like the flowers of A. formosa, reduced hawkmoth visitation by an order of magnitude. In contrast, shortening the length of the nectar spurs of A. pubescens flowers to a length similar to A. formosa flowers did not affect hawkmoth visitation. However, pollen removal was significantly reduced in flowers with shortened nectar spurs. These data indicate that floral traits promote floral isolation between these species and that specific floral traits affect floral isolation via ethological isolation while others affect floral isolation via mechanical isolation. Previous ArticleNext Article VIEW FULL TEXT DOWNLOAD PDF FiguresRelatedReferencesDetailsCited by Zhang W, Liu Y, Nie T, Guo C, Qiu L, Yang G, Jabbour F and Wang W (2021) Floral ontogeny of Delphinium anthriscifolium (Ranunculaceae) and development of intrafloral and symmetrical resupinated organs , Botanical Journal of the Linnean Society, 10.1093/botlinnean/boab041, 198:1, (86-98), Online publication date: 1-Jan-2022. Balbuena M, Broadhead G, Dahake A, Barnett E, Vergara M, Skogen K, Jogesh T and Raguso R (2022) Mutualism has its limits: consequences of asymmetric interactions between a well-defended plant and its herbivorous pollinator, Philosophical Transactions of the Royal Society B: Biological Sciences, 377:1853, Online publication date: 20-Jun-2022. 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