INGESTION AND INCORPORATION BY DAPHNIA SIMILIS FROM CARBON-14 LABELED SCENEDESMUS CULTURES1
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Uptake of 14C by Daphnia similis from labeled Scenedesmus cultures and subsequent loss in unlabeled cultures were measured. In addition, the ingestion rate, measured by decreases in culture radioactivity, was estimated. <BR>1) Ingestion rate, determined from initial increases in animal radioactivity, was 23 dpm/animal/minute. <BR>2) Estimated incorporation rate was 22 dpm/animal/minute. <BR>3) These data indicate an incorporation efficiency of 96% and an egestion rate of only 1 dpm/animal/minute. <BR>4) The ingestion rate estimated from changes in culture radioactivity was 40.2 dpm/ animal/minute, giving an incorporation efficiency of 55% and an egestion rate of about 18 dpm/animal/minute. This latter estimate of ingestion was more acceptable. Reingestion of egested radioactive particles was not a major source of error. <BR>5) Although the radioactivity of groups of animals held in unlabeled Scenedesmus cultures varied, losses of 14C from respiration and excretion were minor in animals held for periods between one and four hours in labeled cultures was an estimate of incorporation rate. <BR>6) Results of a second experiment in which labeled animals were held in unlabeled Scenedesmus cultures indicated that the variability between samples, observed in the first experiment, was associated with variability in the radioactivity of individual animals. <BR>7) Ingestion rates calculated from initial uptake of 14C by the animals requires evaluation. Estimates based on changes in culture radioactivity caused by feeding is an alternative.
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