Summary
A determination was made of the differences in the utilization of energy by laboratory reared larval Choristoneura fumiferana fed either balsam fir or white spruce foliage. This enabled us to quantitatively measure the quality of these foliages vis a vis the spruce budworm.
The larval strategy was to feed rapidly and develop quickly. Development time was longer on spruce than on fir. Total consumption was virtually identical on both foliage types though production was ca 20% greater on a white spruce diet. Calories/gram increased with insect development and with the development of balsam fir foliage but declined over time in white spruce. Assimilation efficiencies (A/C) were 33.9% to 40.2% while gross production efficiencies (P/C) were 9.5% to 13.3% and net production efficiencies (P/A) were 26.1% to 38.8%. The spruce fed insects gave higher values than those on fir, but all values were at the low end of the range for lepidopterous defoliators (possibly due to characteristics of conifer foliage).
The enhanced growth found in spruce fed larvae contrasts the relationship between balsam fir and high insect densities. This is discussed together with the influence of spruce budworm on forest composition and the possible competitive benefits of spruce budworm induced tree mortality.
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Parts of this paper appeared in a Master's thesis (Koller 1978) submitted to the University of Maine
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Noah Koller, C., Leonard, D.E. Comparison of energy budgets for spruce budworm Choristoneura fumiferana (Clemens) on balsam fir and white spruce. Oecologia 49, 14–20 (1981). https://doi.org/10.1007/BF00376892
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DOI: https://doi.org/10.1007/BF00376892