Substrate regulation leads to differential responses of microbial ammonia-oxidizing communities to ocean warming

Zhen-Zhen Zheng, Li-Wei Zheng, Min Nina Xu, Ehui Tan, David A. Hutchins, Wenchao Deng, Yao Zhang, Dalin Shi, Minhan Dai and Shuh-Ji Kao ()
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Zhen-Zhen Zheng: Xiamen University
Li-Wei Zheng: Xiamen University
Min Nina Xu: Xiamen University
Ehui Tan: Xiamen University
David A. Hutchins: University of Southern California
Wenchao Deng: Xiamen University
Yao Zhang: Xiamen University
Dalin Shi: Xiamen University
Minhan Dai: Xiamen University
Shuh-Ji Kao: Xiamen University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract In the context of continuously increasing anthropogenic nitrogen inputs, knowledge of how ammonia oxidation (AO) in the ocean responds to warming is crucial to predicting future changes in marine nitrogen biogeochemistry. Here, we show divergent thermal response patterns for marine AO across a wide onshore/offshore trophic gradient. We find ammonia oxidizer community and ambient substrate co-regulate optimum temperatures (Topt), generating distinct thermal response patterns with Topt varying from ≤14 °C to ≥34 °C. Substrate addition elevates Topt when ambient substrate is unsaturated. The thermal sensitivity of kinetic parameters allows us to predict responses of both AO rate and Topt at varying substrate and temperature below the critical temperature. A warming ocean promotes nearshore AO, while suppressing offshore AO. Our findings reconcile field inconsistencies of temperature effects on AO, suggesting that predictive biogeochemical models need to include such differential warming mechanisms on this key nitrogen cycle process.

Date: 2020
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DOI: 10.1038/s41467-020-17366-3

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