Abstract
Darwin’s naturalization hypothesis predicts successful alien invaders to be distantly related to native species, whereas his pre-adaptation hypothesis predicts the opposite. It has been suggested that depending on the invasion stage (that is, introduction, naturalization and invasiveness), both hypotheses, now known as Darwin’s naturalization conundrum, could hold true. We tested this by analysing whether the likelihood of introduction for cultivation, as well as the subsequent stages of naturalization and spread (that is, becoming invasive) of species alien to Southern Africa are correlated with their phylogenetic distance to the native flora of this region. Although species are more likely to be introduced for cultivation if they are distantly related to the native flora, the probability of subsequent naturalization was higher for species closely related to the native flora. Furthermore, the probability of becoming invasive was higher for naturalized species distantly related to the native flora. These results were consistent across three different metrics of phylogenetic distance. Our study reveals that the relationship between phylogenetic distance to the native flora and the success of an alien species changes from one invasion stage to the other.
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Data availability
The core dataset of this study is available at (https://doi.org/10.6084/m9.figshare.19597093.v1). We also used the GloNAF dataset available at (https://idata.idiv.de/DDM/Data/ShowData/257), The Global Inventory of Floras and Traits database available up on request at (https://gift.uni-goettingen.de/home), The Plant List available at (http://www.theplantlist.org/), and the phylogeny of Smith and Brown (2018) available at (https://github.com/FePhyFoFum/big_seed_plant_trees).
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Acknowledgements
A.O. thanks the Ministry of Higher Education of Sudan and the University of Konstanz for funding, and the International Max Planck Research School for Quantitative Behaviour, Ecology and Evolution for support. M.v.K. thanks the German Research Foundation DFG for funding (grants 264740629 and 432253815). M.R. thanks the DFG for funding (grant RA 3009/1-1). P.P. and J.P. were supported by EXPRO grant no. 19-28807X (Czech Science Foundation) and long-term research development project RVO 67985939 (Czech Academy of Sciences). F.E. appreciates funding from the Austrian Science Foundation FWF (grant I 3757-B29). We thank C. Gommel, K. Mamonova, V. Pasqualetto and B. Rüter for help with data extraction, and L. Henderson for providing lists of naturalized species for South Africa.
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A.O. and M.v.K. conceived and desidned the study. A.O., Q.Y. and M.v.K. compiled data used in this study. A.O. led the analysing with major inputs from M.v.K. and further inputs from P.P., S.D., T.F. and Q.Y. A.O. led the writing with major inputs from M.v.K. and further inputs from T.F., Q.Y., M.R., P.W., H.K., W.D., S.D., F.E., J.P. and P.P.
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Omer, A., Fristoe, T., Yang, Q. et al. The role of phylogenetic relatedness on alien plant success depends on the stage of invasion. Nat. Plants 8, 906–914 (2022). https://doi.org/10.1038/s41477-022-01216-9
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DOI: https://doi.org/10.1038/s41477-022-01216-9
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