H2020Индивидуална стипендия2020–2022

BULLE · Biological Understanding of the CO2 and O2 LeveL in the ocEan

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2020-12-01 → 2022-11-30
Финансиране от ЕС: 184 708 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Бактериалното дишане в океана се анализира чрез измерване на съотношението между консумирания кислород и произвеждания въглероден диоксид. Това помага за по-точно определяне на способността на океаните да абсорбират въглерод от атмосферата и влиянието им върху климата.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Biological Understanding of the CO2 and O2 LeveL in the ocEan

• What is the problem/issue being addressed? The problem being addressed revolves around accurately estimating net community production (NCP) and understanding its implications for the ocean's carbon cycle and climate change. Bacterial respiration is a crucial process in the ocean's carbon cycle, contributing up to 90% of oceanic respiration and playing a significant role in nutrient recycling and CO2 production. However, current methodologies for measuring bacterial respiration introduce uncertainties that can lead to imbalances in carbon flux budgets. The use of conversion factors, particularly the respiratory quotient (RQ), to convert O2 consumption to CO2 production is controversial and lacks environmental regulation data. This uncertainty hinders our understanding of the ocean's capacity to sequester CO2. Additionally, the hypothesis of alternative metabolic pathways reducing RQ under Fe-limited conditions (Fourquez et al., 2014) raises questions about current estimates of CO2 produced by marine bacteria in vast oceanic areas. Therefore, accurately determining RQ and its variability in different environmental conditions is crucial for comprehending the role of biological processes in the global carbon cycle. • Why is it important for society? This research topic is important for society because it addresses the crucial issue of the ocean's carbon cycle and its implications for global climate change. Improving the accuracy of estimates of bacterial respiration is essential for accurately determining the ocean's capacity to sequester atmospheric CO2 and to better understand the role of biological processes in the global carbon cycle. This research has important implications for policymakers, scientists, and the public, as it can inform strategies for mitigating the effects of climate change and promote sustainable environmental practices. • What are the overall objectives? The overall objectives of this research project are to measure bacterial respiration, both as O2 consumption and CO2 production, at a cellular level, and to determine the factors that control RQ in situ by developing a new method. The main goal of the project is to gain a better understanding of the environmental conditions that drive RQ. Among the wide range of parameters that could potentially affect this coefficient, my hypothesis is that the metabolic pathway taken by carbon within a cell, in relation to stoichiometry and nutrient bioavailability, is a key factor.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

About 98% of the ocean’s biomass is composed of microorganisms like the tiny algae, phytoplankton. Tiny but mighty when it comes at capturing carbon dioxide (CO2). Phytoplankton acts for half of the Earth’s photosynthesis, allowing ocean’s to supply major living resources and dioxygen (O2). Microbial respiration is the other fundamental biological process that counterbalances photosynthesis and returns organic carbon back as CO2. Yet, despite ocean’s pivotal role in global climate, microbial respiration remains one of the least explored metabolic processes; so that, whether oligotrophic ocean is a net sink or source of CO2, is highly debated for the last 20 years. The BULLE project aims to evaluate the ocean’s metabolic balance between photosynthesis and respiration by looking at the production of CO2 evolved to that O2 consumed by marine bacteria, the so-called “respiratory quotient” (RQ). Limits of detection of biological CO2 production have left RQ measurements far behind the multitude of investigations of photosynthesis. BULLE will face these challenges using the most recent technologies. The project strongly relies on the multidisciplinary expertise I will share with my host lab to tackle this issue at both cellular and community level. Specifically, BULLE aims to (1) investigate how the chemical characteristics of nutrients (Fe and C) regulate the RQ in bacterial cells and (2) study the links between the RQ, net primary production and bacterial activities. An innovative aspect of BULLE is the implementation of continuous measurements of O2/N2 and pCO2 concentrations respiration, and the deployment of In Situ Oxygen Dynamic Autosampler (IODA) instrumentation in the coastal NW Mediterranean Sea. The training I will receive with BULLE will help me give my career a new direction from a lab expertise towards high resolution in situ observations. In return, I will transfer my experience in microbial metabolisms and radioisotopes tracking methods to the host team.

Оригинален текст от CORDIS (на английски).

Участници

UNIVERSITE D'AIX MARSEILLE · MarseilleКоординаторФранция