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Mesozooplankton taurine production and prokaryotic uptake in the northern Adriatic Sea
Limnology and Oceanography ( IF 4.5 ) Pub Date : 2020-06-25 , DOI: 10.1002/lno.11544
Elisabeth L. Clifford 1 , Daniele De Corte 2 , Chie Amano 1 , Paolo Paliaga 3 , Ingrid Ivančić 4 , Victor Ortiz 1 , Mirjana Najdek 4 , Gerhard J. Herndl 1, 5 , Eva Sintes 1, 6
Affiliation  

Dissolved free taurine, an important osmolyte in phytoplankton and metazoans, has been shown to be a significant carbon and energy source for prokaryotes in the North Atlantic throughout the water column. However, the extent of the coupling between taurine production and consumption over a seasonal cycle has not been examined yet. We determined taurine production by abundant crustacean zooplankton and its role as a carbon and energy source for several prokaryotic taxa in the northern Adriatic Sea over a seasonal cycle. Taurine concentrations were generally in the low nanomolar range, reaching a maximum of 22 nmol L−1 in fall during a Pseudonitzschia bloom and coinciding with the highest zooplankton taurine release rates. Taurine accounted for up to 5% of the carbon, 11% of the nitrogen, and up to 71% of the sulfur requirements of heterotrophic prokaryotes. Members of the Roseobacter clade, Alteromonas, Thaumarchaeota, and Euryarchaeota exhibited higher cell‐specific taurine assimilation rates than SAR11 cells. However, cell‐specific taurine and leucine assimilation were highly variable in all taxa, suggesting species and/or ecotype specific utilization patterns of taurine and dissolved free amino acids. Copepods were able to cover the bulk taurine requirements of the prokaryotic communities in fall and winter and partly in the spring–summer period. Overall, our study emphasizes the significance of taurine as a carbon and energy source for the prokaryotic community in the northern Adriatic Sea and the importance of crustacean zooplankton as a significant source of taurine and other organic compounds for the heterotrophic prokaryotic community.

中文翻译:

亚得里亚海北部的Mesozooplankton牛磺酸生产和原核生物摄取

溶解的游离牛磺酸是浮游植物和后生动物中的重要渗透物,已被证明是整个水柱中北大西洋原核生物的重要碳和能源。然而,尚未研究牛磺酸在一个季节周期内的生产与消费之间的耦合程度。我们确定了季节性甲壳动物丰富的甲壳类浮游动物的牛磺酸产量及其作为北亚得里亚海几种原核生物分类的碳和能源的作用。牛磺酸浓度通常在低纳摩尔浓度范围内,在假单胞菌病期间秋季最高达到22 nmol L -1浮游动物的牛磺酸释放率最高。牛磺酸占异养原核生物的碳需求量的5%,氮含量的11%,硫含量的71%。该成员Roseobacter进化,交替单胞菌,丘姆古菌属和Euryarchaeota表现出比SAR11细胞更高的细胞特异性牛磺酸同化率。但是,细胞特异性牛磺酸和亮氨酸的同化作用在所有分类单元中变化很大,表明牛磺酸和溶解的游离氨基酸的物种和/或生态型特异性利用方式。足足纲动物能够在秋季和冬季以及部分春夏季期间满足原核生物群落中大量牛磺酸的需求。总体而言,我们的研究强调牛磺酸作为亚得里亚海北部原核生物群落碳和能源的重要性,以及甲壳类浮游动物作为牛磺酸和其他有机化合物对异养营养原核生物群落的重要来源的重要性。
更新日期:2020-06-25
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