Naturalizations have led to homogenization of the Malesian flora in the Anthropocene

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2023
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Holmes, Rachael
Pelser, Pieter
Barcelona, Julie
Tjitrosoedirdjo, Sri Sudarmiyati
Wahyuni, Indah
Pysek, Petr
Essl, Franz
Kreft, Holger
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Journal of Biogeography. Wiley. 2023, 51(3), pp. 394-408. ISSN 0305-0270. eISSN 1365-2699. Available under: doi: 10.1111/jbi.14766
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Aim: Worldwide, floras are becoming homogenized at global scales, but regional patterns vary. Here, we present the first assessment for the Malesian phytogeographical region in terms of the timing of introductions, direction, magnitude and drivers of floristic change due to alien plant naturalizations. Location: Malesian phytogeographic region, including Southeast Asia and the Pacific. Taxon: Tracheophyta (vascular plants). Methods: We compiled data on first records of naturalized plants in Malesia to investigate temporal trends in the rate and origin of introductions. We then calculated β-diversity (including turnover and nestedness) for the native, naturalized and Anthropocene (native + naturalized) floras for each pair of island groups (36 pairs), and a homogenization index for the native and Anthropocene floras, using presence/absence data for 31,580 plant species. Mantel tests were used to investigate the geographic, climatic and anthropogenic correlates of dissimilarity and homogenization. Results: Around 75% of all naturalized species documented to date were already reported for the first time within Malesia prior to 1950. This has led to homogenization between the historic (native) and contemporary (Anthropocene) floras for all island group pairs. Turnover was the most important process for driving compositional dissimilarity between island groups in Malesia in the native and Anthropocene floras, but homogenization resulted from decreases in nestedness and turnover. Differences in average taxonomic homogenization for island groups were associated with differences in their level of anthropogenic modification. Main Conclusions: This study improves current understanding of the direction and drivers of floristic homogenization in one of the world's most diverse tropical regions. Alien plant introductions carry a long historical legacy in Malesia, and naturalizations of these plants have led to overall taxonomic homogenization of the region's flora. Expected increases in the magnitude of human modification, without appropriate policy, will likely lead to further reductions in the floristic uniqueness of island groups.

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ISO 690HOLMES, Rachael, Pieter PELSER, Julie BARCELONA, Sri Sudarmiyati TJITROSOEDIRDJO, Indah WAHYUNI, Mark VAN KLEUNEN, Petr PYSEK, Franz ESSL, Holger KREFT, Wayne DAWSON, 2023. Naturalizations have led to homogenization of the Malesian flora in the Anthropocene. In: Journal of Biogeography. Wiley. 2023, 51(3), pp. 394-408. ISSN 0305-0270. eISSN 1365-2699. Available under: doi: 10.1111/jbi.14766
BibTex
@article{Holmes2023-12Natur-68817,
  year={2023},
  doi={10.1111/jbi.14766},
  title={Naturalizations have led to homogenization of the Malesian flora in the Anthropocene},
  number={3},
  volume={51},
  issn={0305-0270},
  journal={Journal of Biogeography},
  pages={394--408},
  author={Holmes, Rachael and Pelser, Pieter and Barcelona, Julie and Tjitrosoedirdjo, Sri Sudarmiyati and Wahyuni, Indah and van Kleunen, Mark and Pysek, Petr and Essl, Franz and Kreft, Holger and Dawson, Wayne}
}
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Location: Malesian phytogeographic region, including Southeast Asia and the Pacific.
Taxon: Tracheophyta (vascular plants).
Methods: We compiled data on first records of naturalized plants in Malesia to investigate temporal trends in the rate and origin of introductions. We then calculated β-diversity (including turnover and nestedness) for the native, naturalized and Anthropocene (native + naturalized) floras for each pair of island groups (36 pairs), and a homogenization index for the native and Anthropocene floras, using presence/absence data for 31,580 plant species. Mantel tests were used to investigate the geographic, climatic and anthropogenic correlates of dissimilarity and homogenization.
Results: Around 75% of all naturalized species documented to date were already reported for the first time within Malesia prior to 1950. This has led to homogenization between the historic (native) and contemporary (Anthropocene) floras for all island group pairs. Turnover was the most important process for driving compositional dissimilarity between island groups in Malesia in the native and Anthropocene floras, but homogenization resulted from decreases in nestedness and turnover. Differences in average taxonomic homogenization for island groups were associated with differences in their level of anthropogenic modification.
Main Conclusions: This study improves current understanding of the direction and drivers of floristic homogenization in one of the world's most diverse tropical regions. Alien plant introductions carry a long historical legacy in Malesia, and naturalizations of these plants have led to overall taxonomic homogenization of the region's flora. Expected increases in the magnitude of human modification, without appropriate policy, will likely lead to further reductions in the floristic uniqueness of island groups.</dcterms:abstract>
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