Seasonal changes in plankton respiration and bacterial metabolism in a temperate shelf sea
Seasonal changes in plankton respiration and bacterial metabolism in a temperate shelf sea
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温带陆架海浮游生物呼吸和细菌代谢的季节变化
DOI：
10.1016/j.pocean.2017.12.002
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发表时间：
2019
影响因子：
4.1
通讯作者：
García-Martín E
中科院分区：
文献类型：
--
作者：
García-Martín E
浮游生物代谢的季节性变化表明了一个系统内有多少碳在循环，以及它储存碳或向深海输出有机物和二氧化碳的能力。报告了2014年11月至2015年4月至2015年7月期间，英国凯尔特海两个站点的上层和底部混合层浮游生物呼吸和细菌（细菌 + 古生菌）代谢的季节变化。上层混合层（11月为175 m， 4月为41-70 m， 7月为50 m）深度综合浮游生物代谢表现出强烈的季节变化，浮游生物呼吸在4月达到最大值（分别比11月和7月高1.2- 2倍），细菌产生在7月达到最大值（比11月和4月高2倍）。而UML深度积分细菌呼吸在11月和4月相似，在7月低2倍。与细菌呼吸相比，细菌产生的变异性更大，这推动了细菌生长效率的季节性变化，7月的最大值为89%，11月的最小值为5%。呼吸速率和总初级生产量（14C-PP）也表现出不同的季节模式，从而导致14C-PP: cro2比值的季节变化。4月，系统为净自养（14C-PP:CRO2> 1），剩余的有机质可用于更高营养水平和出口，而7月，由于浮游生物呼吸增加和总初级生产量减少，系统发生平衡代谢（14C-PP:CRO2= 1）。UML与底部混合层的比较表明，在UML中浮游生物呼吸和细菌产量比下面高（分别在4到8倍和4到7倍之间）。然而，在三个采样季节中，细菌呼吸速率在两个混合层之间没有统计学差异（p> .05）。这些结果突出表明，与以前陆架海的数据相反，UML中浮游生物群落产生的二氧化碳（然后可以将其脱气到大气中）比深层水域中溶解无机碳的呼吸产生的二氧化碳要多，这可能有助于近海出口。
The seasonal variability of plankton metabolism indicates how much carbon is cycling within a system, as well as its capacity to store carbon or export organic matter and CO2to the deep ocean. Seasonal variability between November 2014, April 2015 and July 2015 in plankton respiration and bacterial (Bacteria + Archaea) metabolism is reported for the upper and bottom mixing layers at two stations in the Celtic Sea, UK. Upper mixing layer (UML, >75 m in November, 41–70 m in April and ∼50 m in July) depth-integrated plankton metabolism showed strong seasonal changes with a maximum in April for plankton respiration (1.2- to 2-fold greater compared to November and July, respectively) and in July for bacterial production (2-fold greater compared to November and April). However UML depth-integrated bacterial respiration was similar in November and April and 2-fold lower in July. The greater variability in bacterial production compared to bacterial respiration drove seasonal changes in bacterial growth efficiencies, which had maximum values of 89% in July and minimum values of 5% in November. Rates of respiration and gross primary production (14C-PP) also showed different seasonal patterns, resulting in seasonal changes in14C-PP:CRO2ratios. In April, the system was net autotrophic (14C-PP:CRO2> 1), with a surplus of organic matter available for higher trophic levels and export, while in July balanced metabolism occurred (14C-PP:CRO2= 1) due to an increase in plankton respiration and a decrease in gross primary production. Comparison of the UML and bottom mixing layer indicated that plankton respiration and bacterial production were higher (between 4 and 8-fold and 4 and 7-fold, respectively) in the UML than below. However, the rates of bacterial respiration were not statistically different (p> .05) between the two mixing layers in any of the three sampled seasons. These results highlight that, contrary to previous data from shelf seas, the production of CO2by the plankton community in the UML, which is then available to degas to the atmosphere, is greater than the respiratory production of dissolved inorganic carbon in deeper waters, which may contribute to offshore export.
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