The timing and magnitude of diel migration in two daphnid assemblages were determined from a series of vertical profiles of daphnid size distribution. Animals were collected concurrently for gut fullness determination. Only large daphnids (> 1.4 mm) migrated, but these animals could account for substantial vertical and diel differences in phosphorus excretion rate. Gut fullness measurements and time courses of diel vertical migration suggested that large Daphnia can cause a net downward flux of phosphorus during summer in thermally stratified lakes.
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Dini, M.L., O'Donnell, J., Carpenter, S.R. et al. Daphnia size structure, vertical migration, and phosphorus redistribution. Hydrobiologia 150, 185–191 (1987). https://doi.org/10.1007/BF00006666