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

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2015
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Phillips, Ryan D.
Peakall, Rod
Retter, Bryony A.
Montgomery, Kirke
Davis, Belinda J.
Hayes, Christine
Brown, Graham R.
Swarts, Nigel D.
Dixon, Kingsley W.
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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.

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570 Biowissenschaften, Biologie
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habitat fragmentation, orchid, sexual deception
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ISO 690PHILLIPS, Ryan D., Rod PEAKALL, Bryony A. RETTER, Kirke MONTGOMERY, Myles MENZ, Belinda J. DAVIS, Christine HAYES, Graham R. BROWN, Nigel D. SWARTS, Kingsley W. DIXON, 2015. Pollinator rarity as a threat to a plant with a specialized pollination system. In: Botanical Journal of the Linnean Society. Oxford University Press. 2015, 179(3), pp. 511-525. ISSN 1095-8339. eISSN 0024-4074. Available under: doi: 10.1111/boj.12336
BibTex
@article{Phillips2015-11Polli-50636,
  year={2015},
  doi={10.1111/boj.12336},
  title={Pollinator rarity as a threat to a plant with a specialized pollination system},
  number={3},
  volume={179},
  issn={1095-8339},
  journal={Botanical Journal of the Linnean Society},
  pages={511--525},
  author={Phillips, Ryan D. and Peakall, Rod and Retter, Bryony A. and Montgomery, Kirke and Menz, Myles and Davis, Belinda J. and Hayes, Christine and Brown, Graham R. and Swarts, Nigel D. and Dixon, Kingsley W.}
}
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