Ref ID : 699
Robert Lee Wallace and Peter L. Starkweather; Clearance rates of sessile rotifers: in vitro determinations. Hydrobiologia 121:139-144, 1985
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We measured laboratory clearance rates of 10 rotifers and one unidentified bryozoan species from 3 different lakes using [32]P labeled algae (Chlamydomonas) or yeast (Rhodotorula). Clearance rates for all rotifers fed yeast ranged from <2.0 to >260 ul/animal.hr. depending on species. The in vitro clearance rates of two sessile rotifers (Ptygura crystallina and P. pilula) were not significantly different from previously measured in situ rates (Wallace and Starkweather 1983). Clearance rates for 5 rotifers fed algae ranged from <5.0 to >90.0 ul/animal.hr. Ptygura beauchampi, P. crystallina, P. pilula, Floscularia conifera, and F. melicerta ingested both cell types but their clearance rates varied substantially among species and between cell types. There was a substantial time-dependent loss of [32]P from formalin-fixed animals (Sinantherina socialis) awaiting processing. This loss stabilized at approximately 20 hours and was estimated to be about 40% of the initial ingested label. Clearance rates for the bryozoan fed yeast or algae were highly variable, ranging from <1.0 to >3,000 ul/animal.hr.