BlaisLechowicz1989

Référence

Blais, P.A., Lechowicz, M.J. (1989) Variation among populations of Xanthium strumarium (Compositae) from natural and ruderal habitats. American Journal of Botany, 76(6):901-908.

Résumé

Assessed the mechanisms underlying the ability of cocklebur to spread from its natural riverside habitats and establish weedy populations in urban waste areas. Although there were significant differences among populations in the tradeoff between rate of growth in height and timing of anthesis, these population differences were not associated with habitat. Apart from a tendency to produce larger fruits in ruderal populations, there were no detectable differences in the characteristics of plants from natural vs. ruderal habitats. Plants from both habitats did have substantial and significant plastic responses to growth environment. Fruit numbers increased with resource availability but fruit size did not differ significantly. As resource availability increased, plants from both habitats sustained growth longer and became more branchy. Results supported the idea that natural and ruderal populations do differ in their overall plastic response to resource availability. The subtly different plastic responses of plants from the 2 habitats arise by relatively minor adjustments in a host of functionally interrelated phenological, morphological, and physiological traits. -from Authors

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@ARTICLE { BlaisLechowicz1989,
    AUTHOR = { Blais, P.A. and Lechowicz, M.J. },
    TITLE = { Variation among populations of Xanthium strumarium (Compositae) from natural and ruderal habitats },
    JOURNAL = { American Journal of Botany },
    YEAR = { 1989 },
    VOLUME = { 76 },
    PAGES = { 901-908 },
    NUMBER = { 6 },
    NOTE = { 00029122 (ISSN) Cited By (since 1996): 12 Export Date: 26 April 2007 Source: Scopus Language of Original Document: English },
    ABSTRACT = { Assessed the mechanisms underlying the ability of cocklebur to spread from its natural riverside habitats and establish weedy populations in urban waste areas. Although there were significant differences among populations in the tradeoff between rate of growth in height and timing of anthesis, these population differences were not associated with habitat. Apart from a tendency to produce larger fruits in ruderal populations, there were no detectable differences in the characteristics of plants from natural vs. ruderal habitats. Plants from both habitats did have substantial and significant plastic responses to growth environment. Fruit numbers increased with resource availability but fruit size did not differ significantly. As resource availability increased, plants from both habitats sustained growth longer and became more branchy. Results supported the idea that natural and ruderal populations do differ in their overall plastic response to resource availability. The subtly different plastic responses of plants from the 2 habitats arise by relatively minor adjustments in a host of functionally interrelated phenological, morphological, and physiological traits. -from Authors },
    KEYWORDS = { cocklebur colonization ruderal urban Asteraceae Xanthium Xanthium strumarium },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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