春季东部比格尔海峡浮游生物代谢平衡

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
M.P. Latorre , C.F. Berghoff , R. Giesecke , A. Malits , G. Pizarro , C.M. Iachetti , J. Martin , X. Flores-Melo , M.N. Gil , J.L. Iriarte , I.R. Schloss
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引用次数: 5

摘要

微生物群落代谢平衡(即光合作用和群落呼吸之间的比率)对于评估生物碳泵的强度及其对海洋食物网的重要性至关重要。本研究旨在表征比格海峡(BC,54°S,68°W)的微生物群落代谢平衡(以下简称代谢平衡),比格海峡是一个连接南美洲最南端太平洋和大西洋的亚南极环境。在智利和阿根廷两国于2019年11月沿着不列颠哥伦比亚省东部进行的南极春季巡航中,在12小时的光照和黑暗孵化后,对体外氧气生产和消耗率进行了估计。使用体内活性荧光技术对浮游植物初级生产力进行了额外评估。分析了环境条件(温度、盐度、营养物质、溶解氧、碳酸盐体系和光照)和浮游生物群落的组成(即浮游植物和细菌),以评估控制BC生产力的因素。最后,我们通过高分辨率的正在进行的CO2逸度(fCO2)探索了微生物群落代谢平衡在调节CO2吸收中的作用。结果显示,该系统具有高度动态性和快速变化性,初级生产总值(GPP)呈西-东梯度,研究区域西部的最小值为0.63±0.12 mmol O2 m−3 d−1,大西洋的最大值为13.87±2.00 mmol O2 m-3 d−2。社区呼吸率高(平均:2.81 mmol O2 m−3 d−1),与GPP呈正相关。尽管净群落产量(NCP)相对较低(0.25–3.27 mmol O2 m−3d−1),但P:R比率表明自养群落的普遍性,主要由成链硅藻主导,主要在东部地区(NCP:3.27 mmol O2m−3 d−1)。热盐条件在调节BC的生产能力和海-气CO2交换方面发挥着关键作用,但在产量最高的站点除外,在那里,生物生产推动了fCO2动力学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Plankton metabolic balance in the eastern Beagle Channel during spring

Microbial community metabolic balance (i.e., the ratio between photosynthesis and community respiration) is critical for assessing the strength of the biological carbon pump and its importance for the marine food web. This study aimed at characterizing the microbial community metabolic balance (hereinafter referred to as metabolic balance) in the Beagle Channel (BC, 54°S, 68° W), a sub-Antarctic environment that connects the Pacific and Atlantic Oceans at the southernmost extreme of South America. During a binational Chilean-Argentinian cruise along the eastern BC in the austral spring (November 2019), oxygen production and consumption rates were estimated in vitro after 12-h light and dark incubations. Phytoplankton primary productivity was additionally assessed using in vivo active fluorescence techniques. Environmental conditions (temperature, salinity, nutrients, dissolved oxygen, carbonate system and light) and the composition of the plankton community (i.e., phytoplankton and bacteria) were analyzed to assess the factors controlling productivity in the BC. Finally, we explored the role of the microbial community metabolic balance in modulating CO2 uptake by means of high-resolution underway CO2 fugacities (fCO2). Results showed a highly dynamic and rapidly changing system, with gross primary production (GPP) rates presenting a west-east gradient, with minimum values in the western portion of the study area (0.63 ± 0.12 mmol O2 m−3 d−1) and maximum values towards the Atlantic (13.87 ± 2.00 mmol O2 m−3 d−1). Community respiration rates were high (mean: 2.81 mmol O2 m−3 d−1) and positively correlated with GPP. Although net community production (NCP) was relatively low (0.25–3.27 mmol O2 m−3d−1), the P:R ratio suggests the prevalence of autotrophic communities, dominated by chain forming diatoms, mainly in the eastern portion (NCP : 3.27 mmol O2 m−3 d−1). Thermohaline conditions played a key role in regulating the productive capacity of the BC and in the sea-air CO2 exchange, except in the most productive stations, where biological production fueled fCO2 dynamics.

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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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