Abstract
Abstract Population and production dynamics of the chydorid Eurycercus vernalis were studied in the laboratory and in a small wetland during a 2-y period. Laboratory growth studies were conducted to measure the effects of temperature on E. vernalis growth and reproduction and to develop a multiple-regression equation that used temperature and mass-specific growth rates to estimate secondary production in the field population. Density, biomass, and production were estimated from benthic, water-column, and Nymphaea odorata leaf habitats within vegetated (Nymphaea) and nonvegetated (open-water) areas using monthly samples from the wetland. Eurycercus vernalis exhibited optimal growth, reproductive output, and net reproductive rate when reared at temperatures between 15 and 20°C. Reproductive age and egg development time decreased with increasing temperature, and these decreases led to increased innate capacity of population increase and decreased generation time with increasing temperature. In the field stud...
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