K.B. Armitage B. Saxena E.E. Angino 1973 Calcium was the most important of 27 environmental components affecting density for a 50 week period. Simultaneous stepwise regression accounted for more variability in total number/1 and in the number of ovigerous females/1 than did any of the lag analyses; 1-week lag accounted for the greatest amount of variability in clutch size. Total number and clutch size were little affected by measures of food. ?? 1973 Dr. W. Junk b.v. Publishers. application/pdf 10.1007/BF00047022 en Kluwer Academic Publishers Population dynamics of pond zooplankton II Daphnia ambigua Scourfield article