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Tamarix (Tamaricaceae) hybrids: the dominant invasive genotype in southern Africa

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Abstract

Hybridization is regarded as a rapid mechanism for increasing genetic variation that can potentially enhance invasiveness. Tamarix hybrids appear to be the dominant genotypes in their invasions. Exotic Tamarix are declared invasive in South Africa and the exotic T. chinensis and T. ramosissima are known to hybridize between themselves, and with the indigenous T. usneoides. However, until now, it was not known which species or hybrid is the most prevalent in the invasion. With a biocontrol programme being considered as a way of suppressing the alien Tamarix populations, it is important to document the population genetic dynamics of all species in the region. This investigation sought to identify Tamarix species in southern Africa and their hybrids, describe their population structure, and reveal the geographic origin of the invasive species. To achieve this, nuclear Internal Transcribed Spacer (ITS) sequence data and the multilocus Amplified Fragment Length Polymorphisms (AFLPs) markers were used. Phylogenetic analysis and population genetic structure confirmed the presence of three species in South Africa (T. chinensis, T. ramosissima and T. usneoides) with their hybrids. The indigenous T. usneoides is clearly genetically distant from the alien species T. chinensis and T. ramosissima. Interestingly, the Tamarix infestation in South Africa is dominated (64.7 %) by hybrids between T. chinensis and T. ramosissima. The exotic species match their counterparts from their places of origin in Eurasia, as well as those forming part of the invasion in the US.

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Acknowledgments

This work was funded by the Department of Trade and Industries (DTI) and National Research Foundation (NRF) “THRIP” awards to Isabel Weiersbye and Edward Witkowski (University of Witwatersrand, Johannesburg) for research with AngloGold Ashanti, South Africa (SA) Region Ltd and Ashanti Goldfields Kilo. Special thanks to Ms Kimberley Mann and the Molecular Ecology lab at the United States Department of Agriculture, Agriculture Research Service, Sidney, Montana, USA for her assistance in developing the AFLP markers. We are grateful to the C.E. Moss Herbarium staffs at the School of Animal Plant and Environmental Sciences, Wits University, Johannesburg for providing the facilities and the assistance needed, and to Ruvimbo Mapaya for assistance with the Bayesian analysis.

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Authors and Affiliations

  1. University of the Witwatersrand, Johannesburg, Gauteng, South Africa

    Samalesu G. Mayonde, Glynis V. Cron & Marcus J. Byrne

  2. USDA, Agricultural Research Service, 1500 N. Central Avenue, Sidney, MT, 59270, USA

    John F. Gaskin

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  1. Samalesu G. Mayonde
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  2. Glynis V. Cron
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  3. John F. Gaskin
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  4. Marcus J. Byrne
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Correspondence to Samalesu G. Mayonde.

Appendix 1

Appendix 1

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Table 3 Voucher and locality information for the Tamarix specimens included in this study
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Mayonde, S.G., Cron, G.V., Gaskin, J.F. et al. Tamarix (Tamaricaceae) hybrids: the dominant invasive genotype in southern Africa. Biol Invasions 18, 3575–3594 (2016). https://doi.org/10.1007/s10530-016-1249-4

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