Genetic analysis of native and introduced populations of the aquatic weed Sagittaria platyphylla – implications for biological control in Australia and South Africa

Kwong, Raelene M; Broadhurst, Linda M; Keener, Brian R; Coetzee, Julie A; Knerr, Nunzio; Martin, Grant D

Title: Genetic analysis of native and introduced populations of the aquatic weed Sagittaria platyphylla – implications for biological control in Australia and South Africa
Creator: Kwong, Raelene M
Creator: Broadhurst, Linda M
Creator: Keener, Brian R
Creator: Coetzee, Julie A
Creator: Knerr, Nunzio
Creator: Martin, Grant D
Date Issued: 2017
Date: 2017
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/76991
Identifier: vital:30653
Identifier: https://doi.org/10.1016/j.biocontrol.2017.06.002
Description: Sagittaria platyphylla (Engelm.) J.G. Sm. (Alismataceae) is an emergent aquatic plant native to southern USA. Imported into Australia and South Africa as an ornamental and aquarium plant, the species is now a serious invader of shallow freshwater wetlands, slow-flowing rivers, irrigation channels, drains and along the margins of lakes and reservoirs. As a first step towards initiating a classical biological control program, a population genetic study was conducted to determine the prospects of finding compatible biological control agents and to refine the search for natural enemies to source populations with closest genetic match to Australian and South African genotypes. Using AFLP markers we surveyed genetic diversity and population genetic structure in 26 populations from the USA, 19 from Australia and 7 from South Africa. Interestingly, we have established that populations introduced into South Africa and to a lesser extent Australia have maintained substantial molecular genetic diversity comparable with that in the native range. Results from principal coordinates analysis, population graph theory and Bayesian-based clustering analysis all support the notion that introduced populations in Australia and South Africa were founded by multiple sources from the USA. Furthermore, the divergence of some Australian populations from the USA suggests that intraspecific hybridization between genetically distinct lineages from the native range may have occurred. The implications of these findings in relation to biological control are discussed.
Format: 20 pages
Format: pdf
Language: English
Relation: Biological control
Relation: Kwong, R.M., Broadhurst, L.M., Keener, B.R., Coetzee, J.A., Knerr, N. and Martin, G.D., 2017. Genetic analysis of native and introduced populations of the aquatic weed Sagittaria platyphylla–Implications for biological control in Australia and South Africa. Biological control, 112, pp.10-19.
Relation: Biological control volume 112 10 19 September 2017 1090-2112
Rights: Authors
Rights: Use of this resource is governed by the terms and conditions of the Elsevier Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)

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