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Université de Fribourg

Assessing the risks of non-target feeding by the accidentally introduced ragweed leaf beetle, Ophraella communa, to native European plant species

Augustinus, Benno Andreas ; Gentili, Rodolfo ; Horvath, David ; Naderi, Ruhollah ; Sun, Yan ; Tournet, Anne-Marth Truce Eleonoor ; Schaffner, Urs ; Müller-Schärer, Heinz

In: Biological Control, 2020, vol. 150, p. 104356

In 2013, the North American oligophagous leaf beetle, Ophraella communa LeSage (Coleoptera: Chrysomelidae), was found in Europe for the first time. Recent studies in Northern Italy and Southern Switzerland record extensive defoliation by O. communa on its preferred host, common ragweed, Ambrosia artemisiifolia L. (Asteraceae, Tribe Heliantheae), and reductions in its flowering and seeding. In...

Université de Fribourg

Areas of high conservation value at risk by plant invaders in Georgia under climate change

Slodowicz, Daniel ; Descombes, Patrice ; Kikodze, David ; Broennimann, Olivier ; Müller?Schärer, Heinz

In: Ecology and Evolution, 2018, vol. 8, no. 9, p. 4431–4442

Invasive alien plants (IAP) are a threat to biodiversity worldwide. Understanding and anticipating invasions allow for more efficient management. In this regard, predicting potential invasion risks by IAPs is essential to support conservation planning into areas of high conservation value (AHCV) such as sites exhibiting exceptional botanical richness, assemblage of rare, and threatened and/or...

Université de Fribourg

The alien vascular flora of Linosa (Pelagie Islands, Strait of Sicily): update and management proposals

Pasta, Salvatore ; Ardenghi, Nicola M. G. ; Badalamenti, Emilio ; Mantia, Tommaso La ; Console, Salvatore Livreri ; Parolo, Gilberto

In: Willdenowia, 2017, vol. 47, no. 2, p. 135–144

This paper provides an up-to-date overview of the naturalized alien plants of Linosa (Pelagie Archipelago, Sicily), which includes 83 taxa and accounts for 29 % of the total island's flora. Among these plants, 6 are invasive, 49 are naturalized and 28 are casual. With respect to previous available data, our field investigations resulted in the addition of 31 new xenophytes (21 casual and 10...

Université de Fribourg

Assessing the ecological risk posed by a recently established invasive alien predator: Harmonia axyridis as a case study

Kenis, Marc ; Adriaens, Tim ; Brown, Peter M. J. ; Katsanis, Angelos ; Martin, Gilles San ; Branquart, Etienne ; Maes, Dirk ; Eschen, René ; Zindel, Renate ; Vlaenderen, Johan Van ; Babendreier, Dirk ; Roy, Helen E. ; Hautier, Louis ; Poland, Remy L.

In: BioControl, 2017, vol. 62, no. 3, p. 341–354

Invasive alien predators are a serious threat to biodiversity worldwide. However, there is no generic method for assessing which local species are most at risk following the invasion of a new predator. The harlequin ladybird, Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), is an alien in Europe and many other parts of the world where it affects other species of ladybirds through...

Université de Fribourg

Areas of high conservation value in Georgia: present and future threats by invasive alien plants

Thalmann, Daniela Julia Klara ; Kikodze, David ; Khutsishvili, Manana ; Kharazishvili, David ; Guisan, Antoine ; Broennimann, Olivier ; Müller-Schärer, Heinz

In: Biological Invasions, 2015, vol. 17, no. 4, p. 1041–1054

Georgia is known for its extraordinary rich biodiversity of plants, which may now be threatened due to the spread of invasive alien plants (IAP). We aimed to identify (1) the most prominent IAP out of 9 selected potentially invasive and harmful IAP by predicting their distribution under current and future climate conditions in Georgia as well as in its 43 Protected Areas, as a proxy for areas of...

Université de Fribourg

Allopolyploid origin of highly invasive Centaurea stoebe s.l. (Asteraceae)

Mráz, Patrik ; Garcia-Jacas, Núria ; Gex-Fabry, Emilie ; Susanna, Alfonso ; Barres, Laia ; Müller-Schärer, Heinz

In: Molecular Phylogenetics and Evolution, 2012, vol. 62, no. 2, p. 612–623

Spotted knapweed (Centaurea stoebe) occurs from Western Asia to Western Europe both as diploid and tetraploid cytotypes, predominantly in single-cytotype populations with higher frequency of diploid populations. Interestingly, only tetraploids have been recorded so far from its introduced range in North America where they became highly invasive. We performed phylogenetic and network analyses of...

Université de Fribourg

Aboveground environment type, soil nutrient content and arbuscular mycorrhizal fungi explain establishment success of Centaurea jacea on ex-arable land and in late-successional grasslands

Eschen, René ; Müller-Schärer, Heinz ; Schaffner, Urs

In: Plant and Soil, 2009, vol. 322, no. 1-2, p. 115-123

We studied the relative importance of the aboveground and belowground environment for survival and growth of emerged seedlings of Centaurea jacea to better understand the general difficulty of establishing late-successional species at restoration sites on ex-arable land. Potted seedlings growing on soil from six late-successional grasslands and from six ex-arable (restoration) sites were...

Université de Fribourg

Alien species in a warmer world: risks and opportunities

Walther, Gian-Reto ; Roques, Alain ; Hulme, Philip E. ; Sykes, Martin T. ; Pyšek, Petr ; Kühn, Ingolf ; Zobel, Martin ; Bacher, Sven ; Botta-Dukát, Zoltán ; Bugmann, Harald ; Czúcz, Bálint ; Dauber, Jens ; Hickler, Thomas ; Jarošík, Vojtěch ; Kenis, Marc ; Klotz, Stefan ; Minchin, Dan ; Moora, Mari ; Nentwig, Wolfgang ; Ott, Jürgen ; Panov, Vadim E. ; Reineking, Björn ; Robinet, Christelle ; Semenchenko, Vitaliy ; Solarz, Wojciech ; Thuiller, Wilfried ; Vilà, Montserrat ; Vohland, Katrin ; Settele, Josef

In: Trends in Ecology & Evolution, 2009, vol. 24, no. 12, p. 686-693

Climate change and biological invasions are key processes affecting global biodiversity, yet their effects have usually been considered separately. Here, we emphasise that global warming has enabled alien species to expand into regions in which they previously could not survive and reproduce. Based on a review of climate-mediated biological invasions of plants, invertebrates, fishes and birds, we...