The pollination ecology of an assemblage of grassland asclepiads in South Africa

Jeff Ollerton, Steven D. Johnson, Louise Cranmer, Sam Kellie

    Research output: Contribution to Book/Report typesChapter

    Abstract

    The KwaZulu‐Natal region of South Africa hosts a large diversity of asclepiads (Apocynaceae: Asclepiadoideae), many of which are endemic to the area. The asclepiads are of particular interest because of their characteristically highly evolved floral morphology. During 3 months of fieldwork (November 2000 to January 2001) the flower visitors and pollinators to an assemblage of nine asclepiads at an upland grassland site were studied. These observations were augmented by laboratory studies of flower morphology (including scanning electron microscopy) and flower colour (using a spectrometer). Two of the specialized pollination systems that were documented are new to the asclepiads: fruit chafer pollination and pompilid wasp pollination. The latter is almost unique in the angiosperms. Taxa possessing these specific pollination systems cluster together in multidimensional phenotype space, suggesting that there has been convergent evolution in response to similar selection to attract identical pollinators. Pollination niche breadth varied from the very specialized species, with only one pollinator, to the more generalized, with up to ten pollinators. Pollinator sharing by the specialized taxa does not appear to have resulted in niche differentiation in terms of the temporal or spatial dimensions, or with regards to placement of pollinaria. Nestedness analysis of the data set showed that there was predictability and structure to the pattern of plant‐pollinator interactions, with generalist insects visiting specialized plants and vice versa. The research has shown that there is still much to be learned about plant–pollinator interactions in areas of high plant diversity such as South Africa.
    Original languageEnglish
    Title of host publicationAnnals of Botany
    Pages807-834
    Number of pages28
    DOIs
    Publication statusPublished - 2003

    Publication series

    NameAnnals of Botany
    Volume92

    Fingerprint

    Pollination
    South Africa
    Ecology
    Apocynaceae
    Angiosperms
    Wasps
    Electron Scanning Microscopy
    Insects
    Fruit
    Color
    Grassland
    Phenotype
    Research

    Keywords

    • Apocynaceae
    • Asclepiadaceae
    • Community structure
    • Floral morphology
    • Grassland
    • Mutualism
    • Nestedness
    • Niche
    • Plant assemblage
    • Pollination
    • SEM
    • South Africa
    • Species interactions

    Cite this

    Ollerton, J., Johnson, S. D., Cranmer, L., & Kellie, S. (2003). The pollination ecology of an assemblage of grassland asclepiads in South Africa. In Annals of Botany (pp. 807-834). (Annals of Botany; Vol. 92). https://doi.org/10.1093/aob/mcg206
    Ollerton, Jeff ; Johnson, Steven D. ; Cranmer, Louise ; Kellie, Sam. / The pollination ecology of an assemblage of grassland asclepiads in South Africa. Annals of Botany. 2003. pp. 807-834 (Annals of Botany).
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    abstract = "The KwaZulu‐Natal region of South Africa hosts a large diversity of asclepiads (Apocynaceae: Asclepiadoideae), many of which are endemic to the area. The asclepiads are of particular interest because of their characteristically highly evolved floral morphology. During 3 months of fieldwork (November 2000 to January 2001) the flower visitors and pollinators to an assemblage of nine asclepiads at an upland grassland site were studied. These observations were augmented by laboratory studies of flower morphology (including scanning electron microscopy) and flower colour (using a spectrometer). Two of the specialized pollination systems that were documented are new to the asclepiads: fruit chafer pollination and pompilid wasp pollination. The latter is almost unique in the angiosperms. Taxa possessing these specific pollination systems cluster together in multidimensional phenotype space, suggesting that there has been convergent evolution in response to similar selection to attract identical pollinators. Pollination niche breadth varied from the very specialized species, with only one pollinator, to the more generalized, with up to ten pollinators. Pollinator sharing by the specialized taxa does not appear to have resulted in niche differentiation in terms of the temporal or spatial dimensions, or with regards to placement of pollinaria. Nestedness analysis of the data set showed that there was predictability and structure to the pattern of plant‐pollinator interactions, with generalist insects visiting specialized plants and vice versa. The research has shown that there is still much to be learned about plant–pollinator interactions in areas of high plant diversity such as South Africa.",
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    Ollerton, J, Johnson, SD, Cranmer, L & Kellie, S 2003, The pollination ecology of an assemblage of grassland asclepiads in South Africa. in Annals of Botany. Annals of Botany, vol. 92, pp. 807-834. https://doi.org/10.1093/aob/mcg206

    The pollination ecology of an assemblage of grassland asclepiads in South Africa. / Ollerton, Jeff; Johnson, Steven D.; Cranmer, Louise; Kellie, Sam.

    Annals of Botany. 2003. p. 807-834 (Annals of Botany; Vol. 92).

    Research output: Contribution to Book/Report typesChapter

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    AU - Ollerton, Jeff

    AU - Johnson, Steven D.

    AU - Cranmer, Louise

    AU - Kellie, Sam

    PY - 2003

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    N2 - The KwaZulu‐Natal region of South Africa hosts a large diversity of asclepiads (Apocynaceae: Asclepiadoideae), many of which are endemic to the area. The asclepiads are of particular interest because of their characteristically highly evolved floral morphology. During 3 months of fieldwork (November 2000 to January 2001) the flower visitors and pollinators to an assemblage of nine asclepiads at an upland grassland site were studied. These observations were augmented by laboratory studies of flower morphology (including scanning electron microscopy) and flower colour (using a spectrometer). Two of the specialized pollination systems that were documented are new to the asclepiads: fruit chafer pollination and pompilid wasp pollination. The latter is almost unique in the angiosperms. Taxa possessing these specific pollination systems cluster together in multidimensional phenotype space, suggesting that there has been convergent evolution in response to similar selection to attract identical pollinators. Pollination niche breadth varied from the very specialized species, with only one pollinator, to the more generalized, with up to ten pollinators. Pollinator sharing by the specialized taxa does not appear to have resulted in niche differentiation in terms of the temporal or spatial dimensions, or with regards to placement of pollinaria. Nestedness analysis of the data set showed that there was predictability and structure to the pattern of plant‐pollinator interactions, with generalist insects visiting specialized plants and vice versa. The research has shown that there is still much to be learned about plant–pollinator interactions in areas of high plant diversity such as South Africa.

    AB - The KwaZulu‐Natal region of South Africa hosts a large diversity of asclepiads (Apocynaceae: Asclepiadoideae), many of which are endemic to the area. The asclepiads are of particular interest because of their characteristically highly evolved floral morphology. During 3 months of fieldwork (November 2000 to January 2001) the flower visitors and pollinators to an assemblage of nine asclepiads at an upland grassland site were studied. These observations were augmented by laboratory studies of flower morphology (including scanning electron microscopy) and flower colour (using a spectrometer). Two of the specialized pollination systems that were documented are new to the asclepiads: fruit chafer pollination and pompilid wasp pollination. The latter is almost unique in the angiosperms. Taxa possessing these specific pollination systems cluster together in multidimensional phenotype space, suggesting that there has been convergent evolution in response to similar selection to attract identical pollinators. Pollination niche breadth varied from the very specialized species, with only one pollinator, to the more generalized, with up to ten pollinators. Pollinator sharing by the specialized taxa does not appear to have resulted in niche differentiation in terms of the temporal or spatial dimensions, or with regards to placement of pollinaria. Nestedness analysis of the data set showed that there was predictability and structure to the pattern of plant‐pollinator interactions, with generalist insects visiting specialized plants and vice versa. The research has shown that there is still much to be learned about plant–pollinator interactions in areas of high plant diversity such as South Africa.

    KW - Apocynaceae

    KW - Asclepiadaceae

    KW - Community structure

    KW - Floral morphology

    KW - Grassland

    KW - Mutualism

    KW - Nestedness

    KW - Niche

    KW - Plant assemblage

    KW - Pollination

    KW - SEM

    KW - South Africa

    KW - Species interactions

    UR - http://www.mendeley.com/research/pollination-ecology-assemblage-grassland-asclepiads-south-africa

    U2 - 10.1093/aob/mcg206

    DO - 10.1093/aob/mcg206

    M3 - Chapter

    C2 - 14612378

    SN - 0305-7364 (Print)\r0305-7364 (Linking)

    T3 - Annals of Botany

    SP - 807

    EP - 834

    BT - Annals of Botany

    ER -

    Ollerton J, Johnson SD, Cranmer L, Kellie S. The pollination ecology of an assemblage of grassland asclepiads in South Africa. In Annals of Botany. 2003. p. 807-834. (Annals of Botany). https://doi.org/10.1093/aob/mcg206