Pollinator rarity as a threat to a plant with a specialized pollination system

Ryan Phillips, Rod Peakall, Bryony Retter, Kirke Montgomery, Myles Menz, Belinda Davis, Christine Hayes, Graham Brown, Nigel Swarts, K Dixon

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    An increasing diversity of highly specialized pollination systems are being discovered, many of which are likely to be vulnerable to anthropogenic landscape modification. Here, we investigate if a specialized pollination system limits the persistence of Caladenia huegelii (Orchidaceae), an endangered species pollinated by sexual deception of thynnine wasps. Once locally common in part of its geographical range, C.huegelii is now largely restricted to small habitat remnants in urban areas. Pollinator surveys coupled with DNA barcoding detected a single pollinator taxon, a small form of Macrothynnus insignis. Phylogenetic analysis revealed that small M.insignis from within the range of C.huegelii are strongly divergent from other wasp populations, suggesting that some reproductive isolation may exist. Although common in intact landscapes outside the range of C.huegelli, small M.insignis individuals were recorded at only 4% of sites in suitable C.huegelii habitat. Accordingly, reproductive success in C.huegelii was low compared with related Caladenia spp., with 33-60% of populations failing to set fruit in any given year. As such, populations are likely to now persist primarily through individual plant longevity rather than reproduction. Due to the low reproductive success of C.huegelii, ongoing human intervention will almost certainly be needed to sustain the species. Future research will need to focus on optimizing hand pollination to maintain reproduction and high seed fitness.
    Original languageEnglish
    Pages (from-to)511-525
    Number of pages15
    JournalBotanical Journal of the Linnean Society
    Volume179
    Issue number3
    DOIs
    Publication statusPublished - Nov 2015

    Fingerprint

    rarity
    Caladenia
    pollinator
    pollination
    pollinators
    wasp
    reproductive success
    fruit set
    reproductive isolation
    DNA barcoding
    habitat
    habitats
    Orchidaceae
    endangered species
    urban areas
    fitness
    persistence
    urban area
    phylogenetics
    seed

    Cite this

    Phillips, R., Peakall, R., Retter, B., Montgomery, K., Menz, M., Davis, B., ... Dixon, K. (2015). Pollinator rarity as a threat to a plant with a specialized pollination system. Botanical Journal of the Linnean Society, 179(3), 511-525. https://doi.org/10.1111/boj.12336
    Phillips, Ryan ; Peakall, Rod ; Retter, Bryony ; Montgomery, Kirke ; Menz, Myles ; Davis, Belinda ; Hayes, Christine ; Brown, Graham ; Swarts, Nigel ; Dixon, K. / Pollinator rarity as a threat to a plant with a specialized pollination system. In: Botanical Journal of the Linnean Society. 2015 ; Vol. 179, No. 3. pp. 511-525.
    @article{e239e88a1b0d44e191fa383ba20813c3,
    title = "Pollinator rarity as a threat to a plant with a specialized pollination system",
    abstract = "An increasing diversity of highly specialized pollination systems are being discovered, many of which are likely to be vulnerable to anthropogenic landscape modification. Here, we investigate if a specialized pollination system limits the persistence of Caladenia huegelii (Orchidaceae), an endangered species pollinated by sexual deception of thynnine wasps. Once locally common in part of its geographical range, C.huegelii is now largely restricted to small habitat remnants in urban areas. Pollinator surveys coupled with DNA barcoding detected a single pollinator taxon, a small form of Macrothynnus insignis. Phylogenetic analysis revealed that small M.insignis from within the range of C.huegelii are strongly divergent from other wasp populations, suggesting that some reproductive isolation may exist. Although common in intact landscapes outside the range of C.huegelli, small M.insignis individuals were recorded at only 4{\%} of sites in suitable C.huegelii habitat. Accordingly, reproductive success in C.huegelii was low compared with related Caladenia spp., with 33-60{\%} of populations failing to set fruit in any given year. As such, populations are likely to now persist primarily through individual plant longevity rather than reproduction. Due to the low reproductive success of C.huegelii, ongoing human intervention will almost certainly be needed to sustain the species. Future research will need to focus on optimizing hand pollination to maintain reproduction and high seed fitness.",
    keywords = "endangered species, fitness, geographical distribution, habitat fragmentation, herb, human activity, longevity, phylogenetics, pollination, pollinator, reproductive isolation, reproductive success, research, Caladenia, Orchidaceae",
    author = "Ryan Phillips and Rod Peakall and Bryony Retter and Kirke Montgomery and Myles Menz and Belinda Davis and Christine Hayes and Graham Brown and Nigel Swarts and K Dixon",
    year = "2015",
    month = "11",
    doi = "10.1111/boj.12336",
    language = "English",
    volume = "179",
    pages = "511--525",
    journal = "Botanical Journal of the Linnean Society",
    issn = "0024-4074",
    publisher = "Wiley-Blackwell",
    number = "3",

    }

    Phillips, R, Peakall, R, Retter, B, Montgomery, K, Menz, M, Davis, B, Hayes, C, Brown, G, Swarts, N & Dixon, K 2015, 'Pollinator rarity as a threat to a plant with a specialized pollination system', Botanical Journal of the Linnean Society, vol. 179, no. 3, pp. 511-525. https://doi.org/10.1111/boj.12336

    Pollinator rarity as a threat to a plant with a specialized pollination system. / Phillips, Ryan; Peakall, Rod; Retter, Bryony; Montgomery, Kirke; Menz, Myles; Davis, Belinda; Hayes, Christine; Brown, Graham; Swarts, Nigel; Dixon, K.

    In: Botanical Journal of the Linnean Society, Vol. 179, No. 3, 11.2015, p. 511-525.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Pollinator rarity as a threat to a plant with a specialized pollination system

    AU - Phillips, Ryan

    AU - Peakall, Rod

    AU - Retter, Bryony

    AU - Montgomery, Kirke

    AU - Menz, Myles

    AU - Davis, Belinda

    AU - Hayes, Christine

    AU - Brown, Graham

    AU - Swarts, Nigel

    AU - Dixon, K

    PY - 2015/11

    Y1 - 2015/11

    N2 - An increasing diversity of highly specialized pollination systems are being discovered, many of which are likely to be vulnerable to anthropogenic landscape modification. Here, we investigate if a specialized pollination system limits the persistence of Caladenia huegelii (Orchidaceae), an endangered species pollinated by sexual deception of thynnine wasps. Once locally common in part of its geographical range, C.huegelii is now largely restricted to small habitat remnants in urban areas. Pollinator surveys coupled with DNA barcoding detected a single pollinator taxon, a small form of Macrothynnus insignis. Phylogenetic analysis revealed that small M.insignis from within the range of C.huegelii are strongly divergent from other wasp populations, suggesting that some reproductive isolation may exist. Although common in intact landscapes outside the range of C.huegelli, small M.insignis individuals were recorded at only 4% of sites in suitable C.huegelii habitat. Accordingly, reproductive success in C.huegelii was low compared with related Caladenia spp., with 33-60% of populations failing to set fruit in any given year. As such, populations are likely to now persist primarily through individual plant longevity rather than reproduction. Due to the low reproductive success of C.huegelii, ongoing human intervention will almost certainly be needed to sustain the species. Future research will need to focus on optimizing hand pollination to maintain reproduction and high seed fitness.

    AB - An increasing diversity of highly specialized pollination systems are being discovered, many of which are likely to be vulnerable to anthropogenic landscape modification. Here, we investigate if a specialized pollination system limits the persistence of Caladenia huegelii (Orchidaceae), an endangered species pollinated by sexual deception of thynnine wasps. Once locally common in part of its geographical range, C.huegelii is now largely restricted to small habitat remnants in urban areas. Pollinator surveys coupled with DNA barcoding detected a single pollinator taxon, a small form of Macrothynnus insignis. Phylogenetic analysis revealed that small M.insignis from within the range of C.huegelii are strongly divergent from other wasp populations, suggesting that some reproductive isolation may exist. Although common in intact landscapes outside the range of C.huegelli, small M.insignis individuals were recorded at only 4% of sites in suitable C.huegelii habitat. Accordingly, reproductive success in C.huegelii was low compared with related Caladenia spp., with 33-60% of populations failing to set fruit in any given year. As such, populations are likely to now persist primarily through individual plant longevity rather than reproduction. Due to the low reproductive success of C.huegelii, ongoing human intervention will almost certainly be needed to sustain the species. Future research will need to focus on optimizing hand pollination to maintain reproduction and high seed fitness.

    KW - endangered species

    KW - fitness

    KW - geographical distribution

    KW - habitat fragmentation

    KW - herb

    KW - human activity

    KW - longevity

    KW - phylogenetics

    KW - pollination

    KW - pollinator

    KW - reproductive isolation

    KW - reproductive success

    KW - research

    KW - Caladenia

    KW - Orchidaceae

    UR - http://www.scopus.com/inward/record.url?scp=84983095915&partnerID=8YFLogxK

    U2 - 10.1111/boj.12336

    DO - 10.1111/boj.12336

    M3 - Article

    VL - 179

    SP - 511

    EP - 525

    JO - Botanical Journal of the Linnean Society

    JF - Botanical Journal of the Linnean Society

    SN - 0024-4074

    IS - 3

    ER -