An external expert has evaluated our Action, based on the Final Action Report that we submitted concerning the entire duration of the Action.
Our Action was valued a lot: “This was a highly successful action that contributed new understanding to the general problem of aggressive invasive species and more particularly proposed management schemes to limit the damage and spread of a particularly aggressive European invader. This combination of basic scientific knowledge and applied management schemes is one of the great strengths of this action.”
Find here the Full Summary (a single-page pdf, 135 kb).
Working Group 2 produced this manual on the Ambrosia soil seed bank. It is aimed at researchers and stakeholders that want to know how to assess the number of Ambrosia seeds in the soil.
manual soil-seed-bank-of-ambrosia (pdf)
The SMARTER Taxonomy Group produced a brochure on the identification of 6 ragweed species in Europe for scientists, stakeholders and the general public. It contains pictures of plants, leaves, and seeds and an up-to-date overview of their biological characteristics.
Leaflet of 6 Ambrosia Species (low quality pdf)
Science documentation on the Italian TV station (RAI: Leonardo on 17 November 2016) on our Ambrosia-Ophralla field experiments in Northern Italy.
See from minute 10:20 at this link.
Citation: Scalone, R., Lemke, A., Štefanić, E., Kolseth, A.-K., Rašić, S. and Andersson, L. (2016). Phenological Variation in Ambrosia artemisiifolia L. Facilitates Near Future Establishment at Northern Latitudes. PLoS ONE 11(11), e0166510.
PLOSONE Open Access
Abstract: The invasive weed Ambrosia artemisiifolia (common ragweed) constitutes a great threat to public health and agriculture in large areas of the globe. Climate change, characterized by higher temperatures and prolonged vegetation periods, could increase the risk of establishment in northern Europe in the future. However, as the species is a short-day plant that requires long nights to induce bloom formation, it might still fail to produce mature seeds before the onset of winter in areas at northern latitudes characterized by short summer nights. To survey the genetic variation in flowering time and study the effect of latitudinal origin on this trait, a reciprocal common garden experiment, including eleven populations of A. artemisiifolia from Europe and North America, was conducted. The experiment was conducted both outside the range limit of the species, in Sweden and within its invaded range, in Croatia. Our main hypothesis was that the photoperiodic-thermal requirements of A. artemisiifolia constitute a barrier for reproduction at northern latitudes and, thus, halts the northern range shift despite expected climate change. Results revealed the presence of a north-south gradient in flowering time at both garden sites, indicating that certain European populations are pre-adapted to photoperiodic and thermal conditions at latitudes up to, at least, 60° N. This was confirmed by phenological recordings performed in a region close to the northern range limit, the north of Germany. Thus, we conclude that there exists a high risk for establishment and spread of A. artemisiifolia in FennoScandinavia in the near future. The range shift might occur independently of climate change, but would be accelerated by it.