000023208 001__ 23208
000023208 005__ 20131002113938.0
000023208 0248_ $$aoai:doc.rero.ch:20110609102841-OY$$punifr$$ppostprint$$prero_explore$$zcdu34$$zthesis_urn$$zreport$$zthesis$$zbook$$zjournal$$zcdu574$$zcdu16$$zpreprint$$zcdu1$$zdissertation
000023208 041__ $$aeng
000023208 080__ $$a574
000023208 100__ $$aThébault, Aurélie$$uEcole Polytechnique Fédérale de Lausanne EPFL, Laboratory of Ecological Systems, Lausanne, Switzerland - Swiss Federal Research Institute WSL, Group Restoration Ecology, co EPFL, Lausanne, Switzerland
000023208 245__ $$9eng$$aPolyploidy and invasion success: trait trade-offs in native and introduced cytotypes of two Asteraceae species
000023208 269__ $$c2010-08-04
000023208 520__ $$9eng$$aInvasion success is favoured by the introduction of pre-adapted genotypes. In addition, novel pressures in the introduced range may lead to phenotypic changes related to fitness or competitive ability of introduced plants. Polyploidy appears to be over-represented in invasive plants, but differences between cytotypes in growth strategies including trade-offs among plant traits have received little attention so far in the context of biological invasions. We grew Centaurea stoebe L. and Senecio inaequidens D.C. in a greenhouse experiment to test for differences in fitness (shoot biomass, reproductive output) and competitive ability (vegetative size, specific leaf area, leaf dry matter content, root–shoot ratio) between diploid and polyploid cytotypes as well as between native and introduced plants. For both species, diploid and tetraploid genotypes occur in the native range, whereas only tetraploids are present in the introduced range. In the native range of both species, diploid and tetraploid genotypes had different growth strategies. Tetraploid genotypes of C. stoebe and S. inaequidens had, respectively, higher specific leaf area and stem height than diploid ones. Thus, for both species, native tetraploids appeared more competitive than native diploids, which could explain, at least partially, the invasion success of the pre-adapted tetraploid genotypes. The comparison of native and introduced tetraploid genotypes revealed differences in traits linked to competitive ability, which could be linked to novel selection in the new environment. In S. inaequidens, we found evidence for a competition-colonisation trade-off, whereas persistence of C. stoebe in the new range seemed to be linked to a competition-defence trade-off.
000023208 695__ $$9eng$$aCentaurea stoebe ; Evolutionary processes ; Invasiveness ; Plant traits ; Polyploidy ; Senecio inaequidens
000023208 700__ $$aGillet, François$$uEcole Polytechnique Fédérale de Lausanne EPFL, Laboratory of Ecological Systems, Lausanne, Switzerland - Université de Franche-Comté, CNRS, UMR 6249 Chrono-Environnement, Besançon, France
000023208 700__ $$aMüller-Schärer, Heinz$$uUnit of Ecology and Evolution, Department of Biology, University of Fribourg, Switzerland
000023208 700__ $$aButtler, Alexandre$$uEcole Polytechnique Fédérale de Lausanne EPFL, Laboratory of Ecological Systems, Lausanne, Switzerland - Swiss Federal Research Institute WSL, Group Restoration Ecology, co EPFL, Lausanne, Switzerland - Université de Franche-Comté, CNRS, UMR 6249 Chrono-Environnement, Besançon, France
000023208 773__ $$g2010/212/2/315-325$$tPlant Ecology
000023208 775__ $$ghttp://dx.doi.org/10.1007/s11258-010-9824-8
000023208 8564_ $$fthe_pis.pdf$$qapplication/pdf$$s101512$$uhttp://doc.rero.ch/record/23208/files/the_pis.pdf$$yorder:1$$zpdf
000023208 8564_ $$ftre_deh_sm.pdf$$qapplication/pdf$$s822753$$uhttp://doc.rero.ch/record/23208/files/tre_deh_sm.pdf$$yorder:2$$zSupplementary material
000023208 918__ $$aFaculté des sciences$$bDécanat, Ch. du Musée 6A, 1700 Fribourg$$cBiologie
000023208 919__ $$aUniversité de Fribourg$$bFribourg$$ddoc.support@rero.ch
000023208 980__ $$aPOSTPRINT$$bUNIFR$$fART_JOURNAL
000023208 990__ $$a20110609102841-OY