Variability and Cryptic Heteromorphism of Ambrosia artemisiifolia Seeds: What Consequences for its Invasion in France?
Identifieur interne : 000198 ( France/Analysis ); précédent : 000197; suivant : 000199Variability and Cryptic Heteromorphism of Ambrosia artemisiifolia Seeds: What Consequences for its Invasion in France?
Auteurs : Boris Fumanal [France] ; Bruno Chauvel [France] ; Anne Sabatier [France] ; François Bretagnolle [France]Source :
- Annals of Botany [ 0305-7364 ] ; 2007-08.
Abstract
Background and Aims: Ambrosia artemisiifolia is a ruderal weed introduced from North America to Europe. It produces large amount of achenes which are highly heterogeneous in size. Due to the preponderant role of propagules in invasive plant processes, the achene mass variability related to germination, dispersal strategy and life history traits of offspring were investigated within this species. Methods: The variability in achene mass was quantified among six populations sampled in different habitats. The effects of achene mass variation on germination were studied. The percentages of floating and non-floating achenes were evaluated in the studied populations. The consequences of floatability on the growth and traits of the offspring were studied. Key Results: Mean achene mass ranged from 1·72 to 3·60 mg, depending on the populations, and was highly variable. Variation among achenes within plants accounted for 63·9 % of the variance, whereas variances among plants within each population (22·2 %) and among populations (13·9 %) were lower. Achene masses were also positively correlated to the total germination percentage for four populations out of six. Two kinds of achenes were distinguished: floating and non-floating. The majority of floating achenes (90 %) sank 24 h after water immersion. Whatever the population, floating achenes were lighter, more dormant and germinated faster than non-floating achenes. Plants which issued from floating achenes had better growth than those from non-floating achenes. Conclusions: The capacity of A. artemisiifolia to be invasive in Europe appears to be high, possibly due to its huge plasticity in seed mass which may help it to cope with a wide range of conditions and to establish in disturbed habitats. Furthermore, the recent invasion of southern France by A. artemisiifolia could be partially explained by water dispersal of achenes through rivers and has pinpointed its colonization potential along French rivers.
Url:
DOI: 10.1093/aob/mcm108
Affiliations:
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wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Université de Bourgogne, INRA, UMR 1210 Biologie et Gestion des Adventices, INRA/ENESAD/UB, BP 86510, F-21065 Dijon Cedex</wicri:regionArea><orgName type="university">Université de Bourgogne</orgName><placeName><settlement type="city">Dijon</settlement><region type="region" nuts="2">Région Bourgogne</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Annals of Botany</title><idno type="ISSN">0305-7364</idno><idno type="eISSN">1095-8290</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2007-08">2007-08</date><biblScope unit="volume">100</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="305">305</biblScope><biblScope unit="page" to="313">313</biblScope></imprint><idno type="ISSN">0305-7364</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0305-7364</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">Background and Aims: Ambrosia artemisiifolia is a ruderal weed introduced from North America to Europe. It produces large amount of achenes which are highly heterogeneous in size. Due to the preponderant role of propagules in invasive plant processes, the achene mass variability related to germination, dispersal strategy and life history traits of offspring were investigated within this species. Methods: The variability in achene mass was quantified among six populations sampled in different habitats. The effects of achene mass variation on germination were studied. The percentages of floating and non-floating achenes were evaluated in the studied populations. The consequences of floatability on the growth and traits of the offspring were studied. Key Results: Mean achene mass ranged from 1·72 to 3·60 mg, depending on the populations, and was highly variable. Variation among achenes within plants accounted for 63·9 % of the variance, whereas variances among plants within each population (22·2 %) and among populations (13·9 %) were lower. Achene masses were also positively correlated to the total germination percentage for four populations out of six. Two kinds of achenes were distinguished: floating and non-floating. The majority of floating achenes (90 %) sank 24 h after water immersion. Whatever the population, floating achenes were lighter, more dormant and germinated faster than non-floating achenes. Plants which issued from floating achenes had better growth than those from non-floating achenes. Conclusions: The capacity of A. artemisiifolia to be invasive in Europe appears to be high, possibly due to its huge plasticity in seed mass which may help it to cope with a wide range of conditions and to establish in disturbed habitats. Furthermore, the recent invasion of southern France by A. artemisiifolia could be partially explained by water dispersal of achenes through rivers and has pinpointed its colonization potential along French rivers.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Bourgogne</li><li>Bourgogne-Franche-Comté</li><li>Région Bourgogne</li></region><settlement><li>Dijon</li></settlement><orgName><li>Université de Bourgogne</li></orgName></list><tree><country name="France"><region name="Bourgogne-Franche-Comté"><name sortKey="Fumanal, Boris" sort="Fumanal, Boris" uniqKey="Fumanal B" first="Boris" last="Fumanal">Boris Fumanal</name></region><name sortKey="Bretagnolle, Francois" sort="Bretagnolle, Francois" uniqKey="Bretagnolle F" first="François" last="Bretagnolle">François Bretagnolle</name><name sortKey="Chauvel, Bruno" sort="Chauvel, Bruno" uniqKey="Chauvel B" first="Bruno" last="Chauvel">Bruno Chauvel</name><name sortKey="Chauvel, Bruno" sort="Chauvel, Bruno" uniqKey="Chauvel B" first="Bruno" last="Chauvel">Bruno Chauvel</name><name sortKey="Chauvel, Bruno" sort="Chauvel, Bruno" uniqKey="Chauvel B" first="Bruno" last="Chauvel">Bruno Chauvel</name><name sortKey="Sabatier, Anne" sort="Sabatier, Anne" uniqKey="Sabatier A" first="Anne" last="Sabatier">Anne Sabatier</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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