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The dependence of the assimilation efficiency in Daphnia magna on the 14C‐labeling period of the food alga Scenedesmus acutus
Author(s) -
Nielsen Marianne V.,
Olsen Yngvar
Publication year - 1989
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1989.34.7.1311
Subject(s) - daphnia magna , assimilation (phonology) , biology , algae , scenedesmus obliquus , daphnia , scenedesmus , cladocera , botany , chemistry , ecology , toxicity , linguistics , organic chemistry , crustacean , philosophy
The efficiency of carbon assimilation in Daphnia magna was estimated as a function of the 14 C‐labeling time of the food alga Scenedesmus acutus. The assimilation efficiency of 14 C was up to 24% higher at low labeling times (≤ 1.4 generations) (P < 0.05) than at high labeling times (≥ 4.2 generations). In uniformly labeled cells the assimilation efficiency in D. magna was 71 ± 2% SE. Variation in the assimilation efficiency with labeling time is associated with change in the relative distribution of 14 C among the different cell compartments in the food alga. Uniform labeling of algae is achieved effectively via exponential growth over several generations in batch cultures from sparse inocula.