Volume 42 Issue 11
Nov.  2023
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Xuejia He, Zhang Lu, Weijie Chen, Zhen Shi, Linjian Ou, Ren Hu. Dietary nutrient status modulates nutrient regeneration in the marine ciliate Euplotes vannus[J]. Acta Oceanologica Sinica, 2023, 42(11): 81-89. doi: 10.1007/s13131-023-2172-z
Citation: Xuejia He, Zhang Lu, Weijie Chen, Zhen Shi, Linjian Ou, Ren Hu. Dietary nutrient status modulates nutrient regeneration in the marine ciliate Euplotes vannus[J]. Acta Oceanologica Sinica, 2023, 42(11): 81-89. doi: 10.1007/s13131-023-2172-z

Dietary nutrient status modulates nutrient regeneration in the marine ciliate Euplotes vannus

doi: 10.1007/s13131-023-2172-z
Funds:  The Natural Science Foundation of Guangdong under contract No. 2021A1515011384.
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  • Marine ciliates play important roles not only in linking the microbial loop to the classic pelagic and benthic food chains but also in regenerating nutrients, yet how dietary nutrient imbalance impacts their nutrient regeneration has not been thoroughly addressed. The growth and physiological responses of Euplotes vannus to low dietary nitrogen (LN) and low dietary phosphorus (LP) conditions were studied, with the bacterium Pseudomonas putida as prey. Feeding on LN prey reduced the growth rate of E. vannus. Dietary nutrient limitation changed the types and quantities of nutrient recycling. Feeding on LP prey enhanced dissolved organic carbon excretion but reduced orthophosphate excretion, whereas feeding on LN prey generally resulted in decreases in the excretion rate in all N forms (ammonium, urea, and nitrate). In addition, the proportion of ammonium in regenerated N increased significantly under the LN condition. These findings indicate that a nutrient-imbalanced diet triggers E. vannus to retain limited macronutrients and promotes the recycling of excessive macronutrients, which may potentially form positive and negative feedback to ambient N and P limitations, respectively.
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