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Université de Fribourg

Host Impact and Specificity of Tortoise Beetle (Cassida rubiginosa) on Canada Thistle (Cirsium arvense) in Iran

Asadi, Ghorbanali ; Ghorbani, Reza ; Karimi, Javad ; Bagheri, Alireza ; Müller-Schärer, Heinz

In: Weed Technology, 2013, vol. 27, no. 2, p. 405–411

This study determined the potential of the tortoise beetle (Coleoptera: Chrysomelidae) to control Canada thistle (Asteraceae) in Iran. Genetic analysis of the tortoise beetle, based on mitochondrial DNA, confirmed the presence of the species in Iran. A field experiment using five insect densities (0 to 20 larvae plant−1) showed a positive correlation between the number of larvae transferred and...

Université de Fribourg

Seed provenance matters — Effects on germination of four plant species used for ecological restoration

Bischoff, Armin ; Vonlanthen, Beatrice ; Steinger, Thomas ; Müller-Schärer, Heinz

In: Basic and Applied Ecology, 2006, vol. 7, no. 4, p. 347-359

The use of local seed provenances is often recommended in restoration and habitat creation because they are thought to be better adapted to local habitat conditions. However, spatial scales and the degree of population differentiation are not well known and germination is often not included in comparisons between provenances. We analysed germination as a key trait of plant development in five...

Université de Fribourg

Detecting local adaptation in widespread grassland species – the importance of scale and local plant community

Bischoff, Armin ; Crémieux, Lisèle ; Smilauerova, Marie ; Lawson, Clare S. ; Mortimer, Simon R. ; Dolezal, Jiri ; Lanta, Vojtech ; Edwards, Andrew R. ; Brook, Alex J. ; Macel, Mirka ; Leps, Jan ; Steinger, Thomas ; Müller-Schärer, Heinz

In: Journal of Ecology, 2006, vol. 94, p. 1130-1142

1 Adaptation of plant populations to local environments has been shown in many species but local adaptation is not always apparent and spatial scales of differentiation are not well known. In a reciprocal transplant experiment we tested whether: (i) three widespread grassland species are locally adapted at a European scale; (ii) detection of local adaptation depends on competition with the...

Université de Fribourg

The importance of plant provenance and genotypic diversity of seed material used for ecological restoration

Bischoff, Armin ; Steinger, Thomas ; Müller-Schärer, Heinz

In: Restoration Ecology, 2009///doi:10.1111/j.1526-100X.2008.00454.x

The increased translocation of plant species for biodiversity restoration and habitat creation has provoked a debate on provenance and genotypic diversity of the used plant material. Nonlocal provenances are often not adapted to the local environmental conditions, and low population genotypic diversity may result in genetic bottlenecks hampering successful establishment. We tested provenance...

Université de Fribourg

Testing population differentiation in plant species – how important are environmental maternal effects

Bischoff, Armin ; Müller-Schärer, Heinz

In: Oikos, 2010, vol. 119, no. 3, p. 445-454

The maternal environment may contribute to population differentiation in offspring traits if growing conditions of mother plants are different. However, the magnitude of such environmental maternal effects compared with genetic differentiation is often not clear. We tested the importance of environmental maternal effects by comparing population differentiation in parental seed directly collected...

Université de Fribourg

Is the recent decrease in airborne Ambrosia pollen in the Milan area due to the accidental introduction of the ragweed leaf beetle Ophraella communa?

Bonini, Maira ; Šikoparija, B. ; Prentović, M. ; Cislaghi, G. ; Colombo, P. ; Testoni, C. ; Grewling, L. ; Lommen, Suzanne T. E. ; Müller-Schärer, Heinz ; Smith, M.

In: Aerobiologia, 2015, vol. 31, no. 4, p. 499–513

This study aims to determine whether a significant decrease in airborne concentrations of Ambrosia pollen witnessed in the north-west of the Province of Milan in Northern Italy could be explained by environmental factors such as meteorology, or whether there is evidence to support the hypothesis that the decrease was related to the presence of large numbers of the oligophagous Ophraella communa...

Université de Fribourg

Contrasting spatio-temporal climatic niche dynamics during the eastern and western invasions of spotted knapweed in North America

Broennimann, Olivier ; Mráz, Patrik ; Petitpierre, Blaise ; Guisan, Antoine ; Müller-Schärer, Heinz

In: Journal of Biogeography, 2013///n/a–n/a

Aim: The spotted knapweed (Centaurea stoebe), a plant native to south-east and central Europe, is highly invasive in North America. We investigated the spatio-temporal climatic niche dynamics of the spotted knapweed in North America along two putative eastern and western invasion routes. We then considered the patterns observed in the light of historical, ecological and evolutionary...

Université de Fribourg

Evidence of climatic niche shift during biological invasion

Broennimann, Olivier ; Treier, Urs A. ; Müller-Schärer, Heinz ; Thuiller, W. ; Peterson, A. T. ; Guisan, Antoine

In: Ecology Letters, 2007, vol. 10, no. 8, p. 701-709

Niche-based models calibrated in the native range by relating species observations to climatic variables are commonly used to predict the potential spatial extent of species’ invasion. This climate matching approach relies on the assumption that invasive species conserve their climatic niche in the invaded ranges. We test this assumption by analysing the climatic niche spaces of Spotted...

Université de Fribourg

Plant origin and ploidy influence gene expression and life cycle characteristics in an invasive weed

Broz, Amanda K ; Manter, Daniel K ; Bowman, Gillianne ; Müller-Schärer, Heinz ; Vivanco, Jorge M

In: BMC Plant Biology, 2009, vol. 9, p. 33

Background: Ecological, evolutionary and physiological studies have thus far provided an incomplete picture of why some plants become invasive; therefore we used genomic resources to complement and advance this field. In order to gain insight into the invasive mechanism of Centaurea stoebe we compared plants of three geo-cytotypes, native Eurasian diploids, native Eurasian tetraploids and...