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Life history strategies and production of tinodes waeneri trichoptera in lake esrom denmark



Life history strategies and production of tinodes waeneri trichoptera in lake esrom denmark



Hydrobiologia 112(2): 93-104



The life cycle and production of T. waeneri (L.) was examined at 5 shallow littoral localities in Lake Esrom, Denmark, during 1979/1980. Five larval instars were demonstrated. The differences in temporal composition of instars indicated 3 different life cycles. A bivoltine strategy was shown for the most exposed locality which also had the highest average abundance equal to 11,500 individuals m-2. A univoltine population was found in the more sheltered NW part of the lake with an average density of 1500 individuals m-2. At the 3 remaining stations the life cycles were partly bivoltine with wintering populations of mixed cohorts and densities between 10,500 and 3000 individuals m-2. Two distinct flight periods with maxima in June and Aug. were demonstrated for bi- and partly bivoltine populations. Differences in rates of growth and elimination added to the variability in life cycle. Growth rates peaked in Aug. (5.0-7.4% day-1) at an average temperature of 20.degree. C. Estimates of production ranged from 1.9-17.5 g AFDW [ash free dry weight] m-2 a-1 with an average of 8.0 g AFDW m-2. The P/B [population to biomass] ratios, which were within the expected range for uni- and bivoltine populations of trichopterans, were 5.73 for the bivoltine population and 3.31 for the univoltine population. Estimates of consumption revealed that the populations could be sustained by autochthonous epilithic production in the habitats. Variability in the quality and seasonal availability of food were judged to influence the type of life cycle.

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