0000000000075471
AUTHOR
Beryl Laitung
Invasive and native populations of common ragweed exhibit strong tolerance to foliar damage.
8 pages; International audience; Tolerance and resistance are defence strategies evolved by plants to cope with damage due to herbivores. The introduction of exotic species to a new biogeographical range may alter the plant herbivore interactions and induce selection pressures for new plant defence strategies with a modified resource allocation. To detect evolution in tolerance to herbivory in common ragweed, we compared 3 native (North America) and 3 introduced (France) populations, grown in a common garden environment. We explored the effect of leaf herbivory on plant vegetative and reproductive traits. Plants were defoliated by hand, simulating different degrees of insect grazing by remo…
Mise en garde des scientifiques du monde à l'humanité : deuxième avertissement [french translation of Ripple et al., 2017. World Scientists’ Warning to Humanity: A Second Notice. BioScience, 67 (12):1026-1028]
Traduction Française de l'article: Ripple et al., 2017. World Scientists’ Warning to Humanity: A Second Notice. BioScience, 67 (12):1026-1028Cette traduction est publiée sur le site: http://scientistswarning.forestry.oregonstate.edu/; En 1992, l'Union of Concerned Scientists a appelé à une meilleure gestion de l'environnement. Vingt-cinq ans plus tard, face à l’urgence de l’état environnemental de la planète, plus de 15 000 scientifiques internationaux engagés dans l’Alliance of Word Scientists émettent un deuxième avertissement à l'humanité. Cette mise en garde scientifique a été publiée sous la forme d’un article exceptionnel dans la revue BioScience (Ripple et al., 2017. World Scientists…
Gene flow and population admixture as the primary post-invasion processes in common ragweed (Ambrosia artemisiifolia) populations in France
*An improved inference of the evolutionary history of invasive species may be achieved by analyzing the genetic variation and population differentiation of recently established populations and their ancestral (historical) populations. Employing this approach, we investigated the role of gene flow in the post-invasion evolution of common ragweed (Ambrosia artemisiifolia). *Using eight microsatellite loci, we compared genetic diversity and structure among nine pairs of historical and recent populations in France. Historical populations were reconstructed from herbarium specimens dated from the late 19th to early 20th century, whereas recent populations were collected within the last 5 yr. *Re…
Biological Flora of the British Isles: Ambrosia artemisiifolia
This account presents information on all aspects of the biology of Ambrosia artemisiifolia L. (Common ragweed) that are relevant to understanding its ecology. The main topics are presented within the standard framework of the Biological Flora of the British Isles: distribution, habitat, communities, responses to biotic factors, responses to environment, structure and physiology, phenology, floral and seed characters, herbivores and disease, and history, conservation, impacts and management. Ambrosia artemisiifolia is a monoecious, wind-pollinated, annual herb native to North America whose height varies from 10 cm to 2.5 m, according to environmental conditions. It has erect, branched stems …