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Ingestion and Growth in Sericostoma personatum (Trichoptera) in Relation to the Nitrogen Content of Ingested Leaves

T. M. Iversen
Oikos
Vol. 25, No. 3 (1974), pp. 278-282
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3543945
Stable URL: http://www.jstor.org/stable/3543945
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.
Ingestion and Growth in Sericostoma personatum (Trichoptera) in Relation to the Nitrogen Content of Ingested Leaves
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Abstract

Sericostoma personatum Spence was given autumn-shed leaves with differing nitrogen content: Fagus silvatica L. - 1.33% N of ash free weight, Picea abies (L.) Karst. - 1.48% N, Quercus borealis Michx. - 2.15% N, and Alnus glutinosa (L.) Gaertn. - 4.82% N. Leaves were preferred in the sequence Alnus - Quercus - Fagus/Picea. Ingestion by Sericostoma was significantly lower when fed Alnus than Fagus, Picea, and Quercus. Growth was significantly greater on Alnus and Quercus than on Picea and Fagus. Gross growth efficiency (G/I), calculatedon the basis of ash free weight, was 1.53-9.38% and was positively correlated with leaf nitrogen. Calculated on a nitrogen basis, G/I was 13-22%. The nitrogen content of the detritus may explain the low utilization efficiencies commonly reported for detritivores. /// Sericostoma personatum был предложен осенний олад с различным содержанием азота: Fagus Silvatica L. - 1,33% N, от веса золы, Picea abies (L.) Karst - 1,48% N, Quercus borealis Michx. - 2,15% N и Alnus glutinosa (L.) Gaertn - 4,82% N. Ряд предпочитамости листьев следующий: Alnus, Quercus, Fagus/Picea. Потребление пищи Sericostoma было значительно ниже при кормлении Alnus, по сравнению с Fagus Picea и Quercus. Прирост значительно выше при кормлении Alnus и Quercus, чем Picea и Fagus. Эффективности роста (G/I), рассчитанная по весу золы, составляла 1,53-9,38% и имела прямую зависнмость от содержания азота. Расчеты G/I по азоту составляли 13-22%. Содержание И в детрите может объяснить низкую степень усвоения, обычьо наблюдаюцуюся у детритофагов.

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