干旱区生态环境知识资源中心(Arid): Impact of dust addition on the metabolism of Mediterranean plankton communities and carbon export under present and future conditions of pH and temperature

Arid

DOI	10.5194/bg-18-5423-2021
	Impact of dust addition on the metabolism of Mediterranean plankton communities and carbon export under present and future conditions of pH and temperature
	Gazeau, Frederic; Van Wambeke, France; Maranon, Emilio; Perez-Lorenzo, Maria; Alliouane, Samir; Stolpe, Christian; Blasco, Thierry; Leblond, Nathalie; Zaencker, Birthe; Engel, Anja; Marie, Barbara; Dinasquet, Julie; Guieu, Cecile
通讯作者	Gazeau, F (corresponding author), Sorbonne Univ, CNRS, Lab Oceanog Villefranche, LOV, F-06230 Villefranche Sur Mer, France.
来源期刊	BIOGEOSCIENCES
ISSN	1726-4170
EISSN	1726-4189
出版年	2021
卷号	18 期号:19 页码:5423-5446
英文摘要	Although atmospheric dust fluxes from arid as well as human-impacted areas represent a significant source of nutrients to surface waters of the Mediterranean Sea, studies focusing on the evolution of the metabolic balance of the plankton community following a dust deposition event are scarce, and none were conducted in the context of projected future levels of temperature and pH. Moreover, most of the experiments took place in coastal areas. In the framework of the PEACETIME project, three dust-addition perturbation experiments were conducted in 300 L tanks filled with surface seawater collected in the Tyrrhenian Sea (TYR), Ionian Sea (ION) and Algerian basin (FAST) on board the R/V Pourquoi Pas? in late spring 2017. For each experiment, six tanks were used to follow the evolution of chemical and biological stocks, biological activity and particle export. The impacts of a dust deposition event simulated at their surface were followed under present environmental conditions and under a realistic climate change scenario for 2100 (ca. +3 degrees C and -0.3 pH units). The tested waters were all typical of stratified oligotrophic conditions encountered in the open Mediterranean Sea at this period of the year, with low rates of primary production and a metabolic balance towards net heterotrophy. The release of nutrients after dust seeding had very contrasting impacts on the metabolism of the communities, depending on the station investigated. At TYR, the release of new nutrients was followed by a negative impact on both particulate and dissolved C-14-based production rates, while heterotrophic bacterial production strongly increased, driving the community to an even more heterotrophic state. At ION and FAST, the efficiency of organic matter export due to mineral/organic aggregation processes was lower than at TYR and likely related to a lower quantity/age of dissolved organic matter present at the time of the seeding and a smaller production of DOM following dust addition. This was also reflected by lower initial concentrations in transparent exopolymer particles (TEPs) and a lower increase in TEP concentrations following the dust addition, as compared to TYR. At ION and FAST, both the autotrophic and heterotrophic community benefited from dust addition, with a stronger relative increase in autotrophic processes observed at FAST. Our study showed that the potential positive impact of dust deposition on primary production depends on the initial composition and metabolic state of the investigated community. This impact is constrained by the quantity of nutrients added in order to sustain both the fast response of heterotrophic prokaryotes and the delayed one of primary producers. Finally, under future environmental conditions, heterotrophic metabolism was overall more impacted than primary production, with the consequence that all integrated net community production rates decreased with no detectable impact on carbon export, therefore reducing the capacity of surface waters to sequester anthropogenic CO2.
类型	Article
语种	英语
开放获取类型	Green Accepted, Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000705934900001
WOS关键词	ATMOSPHERIC DEPOSITION ; SAHARAN DUST ; BACTERIAL PRODUCTION ; OCEAN ACIDIFICATION ; LOW NUTRIENT ; SEA-WATER ; LIMITATION ; PHOSPHORUS ; NITROGEN ; WESTERN
WOS类目	Ecology ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
来源机构	French National Research Institute for Sustainable Development ; E17
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362697
作者单位	[Gazeau, Frederic; Alliouane, Samir; Stolpe, Christian; Blasco, Thierry; Guieu, Cecile] Sorbonne Univ, CNRS, Lab Oceanog Villefranche, LOV, F-06230 Villefranche Sur Mer, France; [Van Wambeke, France] Univ Toulon & Var, Aix Marseille Univ, CNRS, INSU,IRD,Mediterranean Inst Oceanog MIO,UM 110, F-13288 Marseille, France; [Maranon, Emilio; Perez-Lorenzo, Maria] Univ Vigo, Dept Ecol & Anim Biol, Vigo 36310, Spain; [Leblond, Nathalie] Sorbonne Univ, CNRS, Inst Mer Villefranche, IMEV, F-06230 Villefranche Sur Mer, France; [Zaencker, Birthe] Marine Biol Assoc UK, Plymouth PL1 2PB, Devon, England; [Zaencker, Birthe; Engel, Anja] GEOMAR Helmholtz Ctr Ocean Res, Kiel, Germany; [Marie, Barbara; Dinasquet, Julie] Sorbonne Univ, CNRS, Lab Oceanog Microbienne, LOMIC, F-66650 Banyuls Sur Mer, France; [Dinasquet, Julie] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92037 USA
推荐引用方式 GB/T 7714	Gazeau, Frederic,Van Wambeke, France,Maranon, Emilio,et al. Impact of dust addition on the metabolism of Mediterranean plankton communities and carbon export under present and future conditions of pH and temperature[J]. French National Research Institute for Sustainable Development, E17,2021,18(19):5423-5446.
APA	Gazeau, Frederic.,Van Wambeke, France.,Maranon, Emilio.,Perez-Lorenzo, Maria.,Alliouane, Samir.,...&Guieu, Cecile.(2021).Impact of dust addition on the metabolism of Mediterranean plankton communities and carbon export under present and future conditions of pH and temperature.BIOGEOSCIENCES,18(19),5423-5446.
MLA	Gazeau, Frederic,et al."Impact of dust addition on the metabolism of Mediterranean plankton communities and carbon export under present and future conditions of pH and temperature".BIOGEOSCIENCES 18.19(2021):5423-5446.