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- Title
Energetic relationships of the larval population of Potamophylax cingulatus (Trichoptera) in a South Swedish stream.
- Authors
Otto, C.
- Abstract
The dynamics of a larval population of Potamophylax cingulatar Steph. (Trickoptera) inhabiting a South Swedish stream was investigated. By far the greatest loss (83%) of population was as "natural mortality", while drift and predation by Salmo trutta L. and Corvus corone cornix L. had only a minor influence. Only 1-2 % of larvae survived from instar I in October to imago in September the next year. Food available in the stream was calculated on a monthly basis by measuring the amounts of food imported, the food remaining from previous months, the living macrophyte vegetation and the loss of potential food as drift. Previous information about the energetic relationships on an Individual basis and the present data permitted calculations of ecological efficiency, food chain efficiency, utilization efficiency and turnover rate. Monthly variations of these efficiency values were considerable. Total production was about 4500 cal m-3 yr-1.
- Subjects
LARVAE; DEVELOPMENTAL biology; CADDISFLIES; STATICS; FOOD; ECOLOGY
- Publication
Oikos, 1975, Vol 26, Issue 2, p159
- ISSN
0030-1299
- Publication type
Article
- DOI
10.2307/3543705