FERRUCCI Maria silvia
The evolution of dispersal traits based on diaspore features in South American populations of Senecio madagascariensis (Asteraceae)
DEMATTEIS, B.; FERRUCCI M.S.; COULLERI, J.P.
AUSTRALIAN JOURNAL OF BOTANY
Lugar: Collingwood; Año: 2019 p. 358 - 366
Plant invasion success is influenced by severaldriving factors such as the dispersal, environmental conditions and the speciescharacteristics. In wind dispersed plants, the dispersal traits and thealtitude are key for predicting dispersal ability. In this work, we estimatedthis feature in Senecio madagascariensis invasive populations from Argentinaand Brazil using diaspore traits to understand its dynamics. Our results showthat dispersal is strongly affected by the geographic conditions. We observedthat in Argentinian populations growing at higher altitudes, selection favourslarger seeds, which might favour seedling establishment over of longerdispersal distance. Conversely, populations grouped in lower altitudes showhigher dispersal ability, probably due to the adaptation to environment andassortment of the better dispersal genotypes. In contrast, the Brazilianpopulations display rapid dispersal ability due to recent colonisation andmultiple introductions. The variability in the gene pool could facilitate theoccurrence of genotypes with greater dispersal, which could explain why thesepopulations display greater dispersal ability than the Argentine ones. Inconclusion, the phenotypic response to geographic conditions and the populationdensity play an important role in the dispersion strategies in S. madagascariensis.