CariseyBauce1997a

Référence

Carisey, N. and Bauce, E. (1997) Impact of balsam fir foliage age on sixth-instar spruce budworm growth, development, and food utilization. Canadian Journal of Forest Research, 27(2):257-264.

Résumé

During spruce budworm (Choristoneura funiferana (Clem.)) outbreaks, when the current-year foliage of balsam fir trees (Abies balsamea (L.) Mill.) is completely destroyed, late-instar larvae must feed on 1-year-old needles. The impact of this feeding behaviour on larval growth, development, and food and nitrogen utilization was studied using laboratory rearing experiments, the calculation of nutritional indices, and foliar chemical analyses. One-year-old foliage had higher concentrations of total monoterpenes, lower concentrations of several nutrients (N, P, K, Mg, and total soluble sugars), and lower water content than current-year foliage. Therefore, sixth-instar larvae fed I-year-old foliage reached the chrysalid stage 2 days later and had 30% lower pupal weights, 26% lower relative growth rates, and 33% lower relative nitrogen accumulation rates than larvae fed current-year foliage. The poor larval performance was due to deprivation of essential nutrients and to postdigestive negative impacts on conversion of digested food to larval biomass. Larvae fed 1-year-old foliage developed several compensatory mechanisms; however, they were proven insufficient for the larvae to gain as much biomass as those fed current-year foliage.

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@ARTICLE { CariseyBauce1997a,
    AUTHOR = { Carisey, N. and Bauce, E. },
    TITLE = { Impact of balsam fir foliage age on sixth-instar spruce budworm growth, development, and food utilization },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 1997 },
    VOLUME = { 27 },
    PAGES = { 257-264 },
    NUMBER = { 2 },
    NOTE = { Xd792 Times Cited:8 Cited References Count:46 },
    ABSTRACT = { During spruce budworm (Choristoneura funiferana (Clem.)) outbreaks, when the current-year foliage of balsam fir trees (Abies balsamea (L.) Mill.) is completely destroyed, late-instar larvae must feed on 1-year-old needles. The impact of this feeding behaviour on larval growth, development, and food and nitrogen utilization was studied using laboratory rearing experiments, the calculation of nutritional indices, and foliar chemical analyses. One-year-old foliage had higher concentrations of total monoterpenes, lower concentrations of several nutrients (N, P, K, Mg, and total soluble sugars), and lower water content than current-year foliage. Therefore, sixth-instar larvae fed I-year-old foliage reached the chrysalid stage 2 days later and had 30% lower pupal weights, 26% lower relative growth rates, and 33% lower relative nitrogen accumulation rates than larvae fed current-year foliage. The poor larval performance was due to deprivation of essential nutrients and to postdigestive negative impacts on conversion of digested food to larval biomass. Larvae fed 1-year-old foliage developed several compensatory mechanisms; however, they were proven insufficient for the larvae to gain as much biomass as those fed current-year foliage. },
    KEYWORDS = { water-content artificial diets tobacco hornworm nitrogen-content manduca-sexta lepidoptera efficiency herbivory terpenes moisture },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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