Mycorrhizal fungi influence global plant biogeography

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2019
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Delavaux, Camille S.
Weigelt, Patrick
Duchicela, Jessica
Essl, Franz
König, Christian
Pergl, Jan
Pyšek, Petr
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Nature Ecology & Evolution. 2019, 3(3), pp. 424-429. eISSN 2397-334X. Available under: doi: 10.1038/s41559-019-0823-4
Zusammenfassung

Island biogeography has traditionally focused primarily on abiotic drivers of colonization, extinction and speciation. However, establishment on islands could also be limited by biotic drivers, such as the absence of symbionts. Most plants, for example, form symbioses with mycorrhizal fungi, whose limited dispersal to islands could act as a colonization filter for plants. We tested this hypothesis using global-scale analyses of ~1.4 million plant occurrences, including ~200,000 plant species across ~1,100 regions. We find evidence for a mycorrhizal filter (that is, the filtering out of mycorrhizal plants on islands), with mycorrhizal associations less common among native island plants than native mainland plants. Furthermore, the proportion of native mycorrhizal plants in island floras decreased with isolation, possibly as a consequence of a decline in symbiont establishment. We also show that mycorrhizal plants contribute disproportionately to the classic latitudinal gradient of plant species diversity, with the proportion of mycorrhizal plants being highest near the equator and decreasing towards the poles. Anthropogenic pressure and land use alter these plant biogeographical patterns. Naturalized floras show a greater proportion of mycorrhizal plant species on islands than in mainland regions, as expected from the anthropogenic co-introduction of plants with their symbionts to islands and anthropogenic disturbance of symbionts in mainland regions. We identify the mycorrhizal association as an overlooked driver of global plant biogeographical patterns with implications for contemporary island biogeography and our understanding of plant invasions.

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570 Biowissenschaften, Biologie
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mycorrhizal fungi, global plant biogeography, ecology
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ISO 690DELAVAUX, Camille S., Patrick WEIGELT, Wayne DAWSON, Jessica DUCHICELA, Franz ESSL, Mark VAN KLEUNEN, Christian KÖNIG, Jan PERGL, Petr PYŠEK, Anke STEIN, 2019. Mycorrhizal fungi influence global plant biogeography. In: Nature Ecology & Evolution. 2019, 3(3), pp. 424-429. eISSN 2397-334X. Available under: doi: 10.1038/s41559-019-0823-4
BibTex
@article{Delavaux2019-03Mycor-45238,
  year={2019},
  doi={10.1038/s41559-019-0823-4},
  title={Mycorrhizal fungi influence global plant biogeography},
  number={3},
  volume={3},
  journal={Nature Ecology & Evolution},
  pages={424--429},
  author={Delavaux, Camille S. and Weigelt, Patrick and Dawson, Wayne and Duchicela, Jessica and Essl, Franz and van Kleunen, Mark and König, Christian and Pergl, Jan and Pyšek, Petr and Stein, Anke}
}
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