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Genetic structure and dispersion processes of an invasive plant,<em> Ambrosia artemisiifolia</em>, within an agricultural landscape

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HAL Id: hal-02738719

https://hal.inrae.fr/hal-02738719

Submitted on 2 Jun 2020

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Genetic structure and dispersion processes of an invasive plant, Ambrosia artemisiifolia, within an agricultural

landscape

Lucie Meyer, Géraldine Bailly, Christophe Delye, Valérie Le Corre

To cite this version:

Lucie Meyer, Géraldine Bailly, Christophe Delye, Valérie Le Corre. Genetic structure and dispersion processes of an invasive plant, Ambrosia artemisiifolia, within an agricultural landscape. Joint 2014 Annual Meeting British Ecological Society and Société Française d’Ecologie (BES & SFE ), Bristih Ecological Society - Société France d’Ecologie., Dec 2014, Lille, France. �hal-02738719�

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Title: Genetic structure and dispersion processes of an invasive plant, Ambrosia artemisiifolia, within an agricultural landscape.

Authors: Lucie Meyer

1

, Géraldine Bailly

2

, Christophe Délye

1

, Valérie Le Corre

1

.

1

INRA – UMR1347 Agroécologie – F-21000 DIJON

2

BASF Agro SAS, Sustainable Agriculture Department, F-69134 ECULLY

The common ragweed – Ambrosia artemisiifolia L. – is an annual herb that belongs to the Asteraceae family. It is known as an invasive plant originating from the USA. In France A. artemisiifolia is especially abundant in the Rhône-Alpes basin and currently spreads northwards. While patterns of colonization across continental and regional scales have been well described, little is known about the landscape-scale processes that influence the step-by- step dissemination of this species. Ragweed colonizes different types of habitats, such as railways or river sides, wastelands or farmlands and cultivated crops.

Genetic diversity and patterns of gene flow in A. artemisiifolia were investigated in an agricultural landscape using ten microsatellites markers. The agricultural landscape studied is located southeast of Dijon (Burgundy, France) and has a surface area of 28 km². All the patches of presence of ragweed within the landscape were recorded and sampled for genetic analyses, yielding a total of 17 populations. Most populations were located along cultivated field margins or within cultivated fields. Allelic richness was high and homogeneously distributed across the landscape. Genetic differentiation was low (F

ST

= 0.058) but significant.

Patterns of genetic structure as inferred from Bayesian analyses showed that populations from different cultivated fields were genetically differentiated and also revealed the presence of distinct colonization events. High values for the correlation of paternity estimated from maternal families indicated limited pollen flow. The spread of A. artemisiifolia in agricultural areas seems mainly due to human activities and farming (seeds transportation by machinery) and would be influenced by the fragmented, mosaic-like structure of cultivated landscapes.

(max: 300 mots)

Kind of presentation: poster Preferred session:

1

st

choice : Invasive species 2

nd

choice : Ecological genetics

Abstract submission deadline is 17.00 BST, Monday 15 September You may edit your abstract online until Sunday 28 September

- See more at: http://www.britishecologicalsociety.org/events/current_future_meetings/2014-

annual-meeting/abstract-submission/#sthash.qLTVeAzm.dpuf

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