Dietary nutrient status modulates nutrient regeneration in the marine ciliate <i>Euplotes vannus</i>

Xuejia He; Zhang Lu; Weijie Chen; Zhen Shi; Linjian Ou; Ren Hu

doi:10.1007/s13131-023-2172-z

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

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

doi: 10.1007/s13131-023-2172-z

Xuejia He^{1
,
,},
Zhang Lu¹,
Weijie Chen¹,
Zhen Shi²,
Linjian Ou¹,
Ren Hu^{3
,
,}

1.
College of Life Science and Technology and Key Laboratory of Eutrophication and Red Tide Preventionof Guangdong Higher Education Institutes, Jinan University, Guangzhou 510000, China
2.
South China Sea Institute of Oceanology, Chinese Academy of Science, Guangzhou 510000, China
3.
Institute of Hydrobiology, Jinan University, Guangzhou 510000, China

Funds: The Natural Science Foundation of Guangdong under contract No. 2021A1515011384.

More Information

Corresponding author: thexuejia@jnu.edu.cn; thuren@jnu.edu.cn
Received Date: 2022-10-29
Accepted Date: 2023-01-30

Available Online: 2023-12-12

Publish Date: 2023-11-01

Abstract

Abstract

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.
- protist,
- excretion,
- bacteria,
- microbial loop,
- nutrient regeneration

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References(55)

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