Article (Scientific journals)
Seed rain pattern of the invasive weed Senecio inaequidens (Asteraceae)
Monty, Arnaud; Stainier, Charles; Lebeau, Frédéric et al.
2008In Belgian Journal of Botany, 141 (1), p. 51-63
Peer reviewed
 

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Keywords :
Senecio inaequidens; Gaussian model; invasive plant; plume loading; seed rain pattern
Abstract :
[en] Dispersion capacity of alien invasive plants is a key feature for understanding invasion processes and risks. Here, we present an experimental study focussing on the seed rain pattern of Senecio inaequidens, an African plant widespread throughout Europe, under common favourable dispersal conditions. One hundred achenes from two Belgian populations underwent a drop time in still air experiment in order to assess linear correlation between several morphological traits and terminal velocity. Variation in morphological traits was measured for 250 additional achenes per population. The trait best correlated to terminal velocity was the square root of the plume loading. We then used this trait to model terminal velocity using a linear regression (r(2) of 79.7%). With this regression and imposing ecological parameters such as wind speed, turbulences and height of release to be representative of favourable dispersal conditions, we established a Gaussian tilted plume model to predict the seed rain pattern of the species. A wind tunnel experiment consequently permitted to validate the model. Under a wind speed of 5 m s(-1) with 2% turbulences along the vertical axis, and height of release of 0.40 m, 99.8% of achenes were dispersed within 100 meters, with a maximum deposition rate at 5.2 m from the parent plant. Uplifted achenes, not forecasted by the model, represent 6.25% of all achenes.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Monty, Arnaud ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Stainier, Charles
Lebeau, Frédéric  ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Pieret, Nora
Mahy, Grégory ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Language :
English
Title :
Seed rain pattern of the invasive weed Senecio inaequidens (Asteraceae)
Publication date :
2008
Journal title :
Belgian Journal of Botany
ISSN :
0778-4031
eISSN :
1781-8656
Publisher :
Soc Royal Botan Belgique
Volume :
141
Issue :
1
Pages :
51-63
Peer reviewed :
Peer reviewed
Name of the research project :
FRFC 2.4556.05
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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