Atmospheric CO2 flux and planktonic food web relationships in temperate marsh systems: insights from in situ water measurements.

IF 2.3 4区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Xaus Lucila, Moncelon Raphaël, Mayen Jérémy, Bergeon Lauriane, Dubillot Bénédicte, Pineau Philippe, Emery Claire, Vagner Marie, Robin Francois-Xavier, Azémar Frédéric, Tackx Michèle, Dupuy Christine, Polsenaere Pierre
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Abstract

While research has extensively investigated the dynamics of CO2 water partial pressure (pCO2) and planktonic food webs (PFWs) separately, there has been limited exploration of their potential interconnections, especially in marsh typologies. This study's objectives were to (1) investigated if pCO2 and atmospheric CO2 flux can be elucidated by PFW topologies, and (2) ascertain if these potential relationships are consistent across two distinct "Blue Carbon" ecosystems. Abiotic and biotic variables were measured in two contrasting wetlands at the Atlantic French coast: a saltwater (SM, L'Houmeau) and a freshwater marsh (FM, Tasdon). SM acted as a weak carbon source, with pCO2 between 542 and 842 ppmv. Conversely, FM exhibited strong atmospheric CO2 source or sink characteristics, varying with seasons and stations, with pCO2 between 3201 and 114 ppmv. Five PFW topologies were linked to varying pCO2 across the two ecosystems: three stable topologies ('biological winter', 'microbial', 'multivorous' PFW) exhibited consistently high pCO2 values (FM: 971, 1136, 3020 ppmv; SM: 'biological winter' not observed, 842, 832 ppmv), while two transient topologies ('weak multivorous' and 'weak herbivorous') displayed lower and more variable pCO2 values (FM: from 127 to 1402 ppmv; SM: from 638 to 749 ppmv). Seasonality emerged as an influencing factor for both pCO2 dynamics and PFW. However, PFW in FM did not demonstrate a seasonal equilibrium state, potentially hindering a clearer understanding of the relationship between pCO2 and PFW. This is the first documented association between PFW topologies and pCO2 dynamics in "Blue Carbon" marsh environments.

温带沼泽系统中大气CO2通量和浮游生物食物网的关系:来自原位水测量的见解。
虽然研究已经广泛地研究了二氧化碳水分压(pCO2)和浮游食物网(PFWs)的动态,但对它们之间潜在的相互联系的探索有限,特别是在沼泽类型中。本研究的目的是:(1)调查pCO2和大气CO2通量是否可以通过PFW拓扑来解释,(2)确定这些潜在的关系是否在两个不同的“蓝碳”生态系统中是一致的。在法国大西洋沿岸的两个不同的湿地中测量了非生物和生物变量:一个是咸水(SM, L'Houmeau),一个是淡水沼泽(FM, Tasdon)。SM是弱碳源,pCO2在542 ~ 842 ppmv之间。相反,FM表现出强烈的大气CO2源/汇特征,随季节和台站变化,pCO2在3201 ~ 114 ppmv之间。5种PFW拓扑与两个生态系统的pCO2变化有关:3种稳定拓扑(“生物冬季”、“微生物”、“多食性”PFW)表现出持续的高pCO2值(FM: 971、1136、3020 ppmv;SM:未观察到“生物冬季”,842,832 ppmv),而两种瞬态拓扑(“弱杂食性”和“弱草食性”)显示出更低和更可变的pCO2值(FM:从127到1402 ppmv;SM:从638到749 ppmv)。季节性是影响pCO2动态和PFW的因素。然而,FM中的PFW并没有表现出季节性平衡状态,这可能会阻碍对pCO2和PFW之间关系的更清晰理解。这是“蓝碳”沼泽环境中PFW拓扑结构与pCO2动态之间的第一个记录关联。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Microbiology
International Microbiology 生物-生物工程与应用微生物
CiteScore
5.50
自引率
3.20%
发文量
67
审稿时长
3 months
期刊介绍: International Microbiology publishes information on basic and applied microbiology for a worldwide readership. The journal publishes articles and short reviews based on original research, articles about microbiologists and their work and questions related to the history and sociology of this science. Also offered are perspectives, opinion, book reviews and editorials. A distinguishing feature of International Microbiology is its broadening of the term microbiology to include eukaryotic microorganisms.
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