
%0 Journal Article
%A Mitchell, BD 
%A Williams, WD 
%T Population dynamics and production of <I>Daphnia carinata</I> (King) and <I>Simocephalus exspinosus</I> (Koch) in waste stabilization ponds
%J Marine and Freshwater Research
%D 1982/10/01
%V 33
%N 5
%P 837-864
%K 
%R https://doi.org/10.1071/MF9820837
%U https://www.publish.csiro.au/paper/MF9820837 
%X The population dynamics and production of D. carinata and S. exspinosus were investigated in two adjacent maturation-type waste stabilization ponds in South Australia. Population parameters (b', r', and d') for both species were determined from population density, brood size, and egg-development time. Length-weight relationships were determined for both species. Growth of D. carinata was investigated experimentally. Net production of both species was determined using Edmondson's population turnover- time model. Production of D. carinata was also determined using Winberg's biomass turnover model. D. carinata, the numerically dominant species, was a cold water form; high water temperatures increased mortality and reduced growth rate. Both species were food-limited at high population densities. Total annual net production of D. carinata in pond 1 during 1977 (345 g dry wt m-2): calculated using the population turnover-time model, was the highest yet recorded for any planktonic cladoceran. Annual net production of D. carinata determined using the population turnover-time model exceeded annual production determined using the biomass turnover model by 100%. Overestimation of daily production rate was highest during periods of high egg mortality. Total annual net production of D. carinata and S. exspinosus (biomass turnover model) represented a nutrient store equivalent to less than 6% of total PO4-P and total nitrogen retained in the ponds annually. 
