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Energy, Matter and Nitrogen Utilization by Larvae of the Milkweed Tiger Moth Euchaetias egle

L. A. Schroeder
Oikos
Vol. 28, No. 1 (1977), pp. 27-31
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3543319
Stable URL: http://www.jstor.org/stable/3543319
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Energy, Matter and Nitrogen Utilization by Larvae of the Milkweed Tiger Moth Euchaetias egle
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Abstract

Dry matter, energy, nitrogen and ash budgets of the form ingestion (I) = growth (G) + respiration (R) + feces (F) were evaluated for the larvae of Euchaetias egle (Drury) fed Asclepias syriaca L. at 27°C, 87 + % RH, 14 h light. Gross efficiencies of growth (100G/I) were 14.6% (dry matter), 20% (energy equivalents), 34.5% (nitrogen) and 3.8% (ash). Net efficiencies of growth 100 G/(I - F) were 42.6% (dry matter) and 49,6% (energy equivalents). Comparison of economies of growth of E. egle with Danaus plexippus L., reared under similar conditions, suggests a difference in digestive or assimilative processes between the two species. Comparison of efficiency of energy utilization and rate of growth with D. plexippus did not support the hypothesis that efficiency is inversely related to rate of energy utilization. Comparisons of efficiencies of both matter and energy utilization with other lepidopteran larvae did not support the hypothesis of greater efficiencies of resource utilization by oligophagous than by polyphagous Lepidoptera. /// У гусениц Euchaetias egle (Drury), которых кормили Asclepias syriaca L. при 27°C, 87 + % RH и 14-часовом световом дне, определяли содержание сухого вешества, энергетический баланс, содержание азота и золы по формуле: потебление (I) = рост (G) + дыхание (R) + непереваренные остатки (F). Величина роста составляла при 100 G/I 14,6% (по сух.в-ву), 20% (энерг.экв.), 34,5% (N) и 3,8% (зола). Чистые коэффициенты роста при 100 G/(I-F) составляли 42,6% (сух.в-во) и 49,2% (энерг.экв.). Сравнение экономики роста у E. egle и Danaus plexippus L. содержавшихся в сходных условиях, свидетельствуют о различии процессов пишеварения или ассимиляции у двух видов. Сравнение коэффициентов утилизации энергии и скорости роста с таковыми у D. plexippus не подтверждают предполжения, что эти коэффициенты обратно пропорциональны скрости утилизации энергии. Сравнения коэффициентов усвояения вешества и энергии у других гусениц бабочек не подтверждают гипотезу о наличии более вычоких коэффициентов учвояемости пишевых ресурсов у олигофагв по сравнию с полифагами.

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