Pronounced Diel Cycling of Dissolved Carbohydrates and Amino Acids in the Surface Ocean and across Diverse Regimes

IF 10.8 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Theresa Barthelmeß, Antonia Cristi, Stacy Deppeler, Karl Safi, Karine Sellegri, Cliff S. Law, Anja Engel
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引用次数: 0

Abstract

The metabolism of phytoplankton cells is synchronized with the diel light cycle. Likewise, associated heterotrophic bacteria adjust their diel expression of transporter- and catabolism-related genes to target the dissolved organic matter released by the phytoplankton cell. Dissolved combined carbohydrates (DCCHO) and dissolved amino acids (DAA) are major phytoplankton products and bacterial substrates. Here, we show that diel variations of DCCHO and DAA concentrations accounted for a significant turnover of the total organic carbon (TOC) pool (up to 5.0%, at a rate of 0.37 μM C h–1) and total organic nitrogen (TON) (up to 5.5%, 0.04 μM N h–1) across diverse oceanic regimes (sub-Antarctic to subtropical waters of the Southwestern Pacific Ocean). Glucose contributed most to the observed carbon turnover, while polar amino acids dominated the nitrogen turnover. DAA concentration and composition correlated with viral abundance, suggesting that viral lysis may have caused the the highest DAA concentration at night. Our finding of diel cycling of major dissolved organic phytoplankton products supports the notion of universally synchronized ecosystem dynamics. Such periodicity may enhance nutrient cycling and thus primary production and constrains parts of the yet uncharacterized labile organic carbon flux fueling the microbial carbon pump.

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来源期刊
环境科学与技术
环境科学与技术 环境科学-工程:环境
CiteScore
17.50
自引率
9.60%
发文量
12359
审稿时长
2.8 months
期刊介绍: Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.
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