LapointeBussieresCreteEtAl2010

Référence

Lapointe, L., Bussieres;, J., Crete, M. and Ouellet, J.-P. (2010) Impact of growth form and carbohydrate reserves on tolerance to simulated deer herbivory and subsequent recovery in Liliaceae. American Journal of Botany, 97(6):913-924. (Scopus )

Résumé

Premise of the study: Over-browsing of the understory vegetation by white-tailed deer has been a cause of decline in many plant populations. Liliaceae are particularly sensitive, yet individual species differ in their tolerance to deer herbivory. In this paper, we examine whether differences in clonal habit, carbon allocation patterns, and phenology infl uence the capacity of a species to tolerate and recover from repeated herbivory. Methods: Flowering ramets of Clintonia borealis, Maianthemum canadense, and Trillium erectum were subjected to total defoliation for one or two springs. Key results: Survival was highest in the nonclonal species, T. erectum, most probably due to its very large carbohydrate reserves. Nutrient reserves were less affected than carbohydrate reserves by defoliation, confi rming the importance of carbohydrate reserves for survival. However, faster recovery following episodes of defoliation was observed not in the species that sprouted the earliest, T. erectum, but in the clonal species, M. canadense, which had the smallest carbohydrate reserves but also a lower shoot to root ratio than the other clonal species, C. borealis. All plants that were defoliated for 2 years only partially recovered in terms of leaf area, plant biomass, and carbohydrate and nutrient reserves, confi rming the overall sensitivity of these species to simulated deer herbivory. Conclusions: High carbohydrate reserves and consequently low shoot to root ratios appear to increase tolerance to herbivory, whereas clonal species recover faster than nonclonal species. The role played by carbohydrates reserves suggests that these species could benefi t from slightly higher light conditions in areas subjected to high deer pressure. © 2010 Botanical Society of America.

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@ARTICLE { LapointeBussieresCreteEtAl2010,
    AUTHOR = { Lapointe, L. and Bussieres;, J. and Crete, M. and Ouellet, J.-P. },
    TITLE = { Impact of growth form and carbohydrate reserves on tolerance to simulated deer herbivory and subsequent recovery in Liliaceae },
    JOURNAL = { American Journal of Botany },
    YEAR = { 2010 },
    VOLUME = { 97 },
    PAGES = { 913-924 },
    NUMBER = { 6 },
    ABSTRACT = { Premise of the study: Over-browsing of the understory vegetation by white-tailed deer has been a cause of decline in many plant populations. Liliaceae are particularly sensitive, yet individual species differ in their tolerance to deer herbivory. In this paper, we examine whether differences in clonal habit, carbon allocation patterns, and phenology infl uence the capacity of a species to tolerate and recover from repeated herbivory. Methods: Flowering ramets of Clintonia borealis, Maianthemum canadense, and Trillium erectum were subjected to total defoliation for one or two springs. Key results: Survival was highest in the nonclonal species, T. erectum, most probably due to its very large carbohydrate reserves. Nutrient reserves were less affected than carbohydrate reserves by defoliation, confi rming the importance of carbohydrate reserves for survival. However, faster recovery following episodes of defoliation was observed not in the species that sprouted the earliest, T. erectum, but in the clonal species, M. canadense, which had the smallest carbohydrate reserves but also a lower shoot to root ratio than the other clonal species, C. borealis. All plants that were defoliated for 2 years only partially recovered in terms of leaf area, plant biomass, and carbohydrate and nutrient reserves, confi rming the overall sensitivity of these species to simulated deer herbivory. Conclusions: High carbohydrate reserves and consequently low shoot to root ratios appear to increase tolerance to herbivory, whereas clonal species recover faster than nonclonal species. The role played by carbohydrates reserves suggests that these species could benefi t from slightly higher light conditions in areas subjected to high deer pressure. © 2010 Botanical Society of America. },
    COMMENT = { Export Date: 23 June 2010 Source: Scopus CODEN: AJBOA doi: 10.3732/ajb.0900200 },
    ISSN = { 00029122 (ISSN) },
    KEYWORDS = { Carbohydrate reserves, Clintonia borealis, Deer herbivory, Defoliation, Liliacaeae, Maianthemum canadense, Nutrient reserves, Recovery, Trillium erectum },
    OWNER = { Luc },
    TIMESTAMP = { 2010.06.23 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-77953523656&partnerID=40&md5=eb6df0b053212a8b765131667b2a61dd },
}

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