Hallmann, Caspar A.Institute For Water And Wetland Research, Radboud University, Nijmegen, The Netherlands
Jongejans, EelkeInstitute For Water And Wetland Research, Radboud University, Nijmegen, The Netherlands
Chauvel, BrunoAgroécologie, AgroSup Dijon, INRAUniv. Bourgogne Franche-Comté, Dijon, France
Leitsch-Vitalos, MelindaInstitute of Botany, University Of Natural Resources And Life Sciences, Vienna, Austria
Aleksanyan, AllaDepartment of Geobotany And Eco-Physiology, Institute of Botany, National Academy of Sciences of Armenia, Yerevan, Armenia
Tóth, PeterDepartment of Plant Protection, Slovak University of Agriculture, Nitra, Slovakia
Preda, CristinaAgricultural Institute Of Slovenia, Ljubljana, Slovenia
Šćepanović, MajaFaculty of AgricultureUniversity Of Zagreb, Croatia
Onen, HuseyinDepartment of Plant Protection, Faculty Of Agriculture, Gaziosmanpasa University, Tokat, Turkey
Tokarska-Guzik, BarbaraDepartment of Botany And Nature Protection, Faculty Of Biology and Environmental Protection, University of Silesia in Katowice, Poland
Anastasiu, PaulinaDepartment of Botany And Microbiology & Botanic Garden “D. Brandza”, University of Bucharest, Bucharest, Romania
Dorner, ZitaPlant Protection Institute, Szent István University, Gödöllő, Hungary
Fenesi, AnnamáriaHungarian Department of Biology And Ecology, Babeş-Bolyai University, Cluj-Napoca, Romania
Karrer, GerhardInstitute of Botany, University Of Natural Resources And Life Sciences, Vienna, Austria
Nagy, KatalinFaculty of Agricultural And Food SciencesSzéChenyi István University, Mosonmagyaróvár, Hungary
Pinke, GyulaFaculty of Agricultural And Food SciencesSzéChenyi István University, Mosonmagyaróvár, Hungary
Tiborcz, ViktorInstitute of Botany And Nature Conservation, Faculty Of Forestry, University Of West Hungary, Sopron, Hungary
Zagyvai, GergelyInstitute of Botany And Nature Conservation, Faculty Of Forestry, University Of West Hungary, Sopron, Hungary
Zalai, MihályPlant Protection Institute, Szent István University, Gödöllő, Hungary
Kazinczi, GabriellaInstitute of Plant Science, Faculty Of Agricultural And Environmental Sciences, Kaposvár University, Kaposvár, Hungary
Leskovšek, RobertAgricultural Institute Of Slovenia, Ljubljana, Slovenia
Stešević, DanijelaBiology Department, Faculty of Natural Sciences And Mathematics, University Of Montenegro, Podgorica, Montenegro
Fried, GuillaumeLaboratoire de la Santé des Végétaux, Unité Entomologie et Plantes Invasives, Anses Monferrier-sur-Lez, France
English
To better manage invasive populations, it is vital to understand the environmental drivers underlying spatial variation in demographic performance of invasive individuals and populations. The invasive common ragweed, Ambrosia artemisiifolia, has severe adverse effects on agriculture and human health, due to its vast production of seeds and allergenic pollen. Here, we identify the scale and nature of environmental factors driving individual performance of A. artemisiifolia, and assess their relative importance. We studied 39 populations across the European continent, covering different climatic and habitat conditions. We found that plant size is the most important determinant in variation of per-capita seed and pollen production. Using plant volume as a measure of individual performance, we found that the local environment (i.e. the site) is far more influential for plant volume (explaining 25% of all spatial variation) than geographic position (regional level; 8%) or the neighbouring vegetation (at the plot level; 4%). An overall model including environmental factors at all scales performed better (27%), including the weather (bigger plants in warm and wet conditions), soil type (smaller plants on soils with more sand), and highlighting the negative effects of altitude, neighbouring vegetation and bare soil. Pollen and seed densities varied more than 200-fold between sites, with highest estimates in Croatia, Romania and Hungary. Pollen densities were highest on arable fields, while highest seed densities were found along infrastructure, both significantly higher than on ruderal sites. We discuss implications of these findings for the spatial scale of management interventions against A. artemisiifolia.