5554877356

Материал из Антэкология /// Anthecology
(перенаправлено с «10.1007/BF00328800»)
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AID: 5554877356
Английский
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Larval feeding behaviour affects the impact of staminate flower production on the suitability of balsam fir trees for spruce budworm
Oecologia, . V. 105. No. 1. P. 126131 (6).
Laboratory rearing of spruce budworm, Choristoneura fumiferana, in conjunction with field rearing indicated that the feeding behaviour of the larvae, which is affected by the insect population density, significantly influenced the impact of balsam fir, Abies balsamea, staminate flowering on spruce budworm biology. At low budworm density, the production of pollen in the midcrown of host trees reduced the insect development time by 5 days without affecting pupal weight, fecundity and survival. However, at high budworm density, the small amount of current-year foliage produced by flowering branches forced old larvae (sixth instar) either to feed on 1-year-old foliage (backfeeding) or to move from the midcrown to the lower crown section where staminate flowers are absent and more current-year foliage is available. When old larvae fed on old foliage, they exhibited reduced pupal weight and fecundity without losing the advange in development time that they obtained from feeding on pollen during their early stages of development. On the other hand, when old larvae moved to the lower crown section, they avoided the negative effects of backfeeding but lost the advantage in development time that was gained from feeding on pollen. Results from this study indicated that the production of staminate flowers by balsam fir trees could have opposite effects on spruce budworm population dynamics depending upon the insect population density when flowering occurs.
Ключевые словаStaminate flowers, Feeding behaviour, Pollen
Таксоны растенийAbies balsamea, Abies
Таксоны животныхChoristoneura fumiferana, Choristoneura
В подборкахОсновная литература

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