干旱区生态环境知识资源中心(Arid): Uneven response of phytoplankton-bacteria coupling under Saharan dust pulse and ultraviolet radiation in the south-western Mediterranean Sea

Arid

DOI	10.1016/j.scitotenv.2024.172220
	Uneven response of phytoplankton-bacteria coupling under Saharan dust pulse and ultraviolet radiation in the south-western Mediterranean Sea
	Carrillo, Presentacion; Gonzalez-Olalla, Juan Manuel; Cabrerizo, Marco J.; Villar-Argaiz, Manuel; Medina-Sanchez, Juan Manuel
通讯作者	González-Olalla, JM
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2024
卷号	927
英文摘要	The microbial carbon (C) flux in the ocean is a key functional process governed by the excretion of organic carbon by phytoplankton (EOC) and heterotrophic bacterial carbon demand (BCD). Ultraviolet radiation (UVR) levels in upper mixed layers and increasing atmospheric dust deposition from arid regions may alter the degree of coupling in the phytoplankton-bacteria relationship (measured as BCD:EOC ratio) with consequences for the C-flux through these compartments in marine oligotrophic ecosystem. Firstly, we performed a field study across the south-western (SW) Mediterranean Sea to assess the degree of coupling (BCD:EOC) and how it may be related to metabolic balance (total primary production: community respiration; PPT:CR). Secondly, we conducted a microcosm experiment in two contrasting areas (heterotrophic nearshore and autotrophic open sea) to test the impact of UVR and dust interaction on microbial C flux. In the field study, we found that BCD was not satisfied by EOC (i.e., BCD:EOC >1; uncoupled phytoplankton-bacteria relationship). BCD:EOC ratio was negatively related to PPT:CR ratio across the SW Mediterranean Sea. A spatial pattern emerged, i.e. in autotrophic open sea stations uncoupling was less severe (BCD:EOC ranged 1-2), whereas heterotrophic nearshore stations uncoupling was more severe (BCD:EOC > 2). In the experimental study, in the seawater both enriched with dust and under UVR, BCD:EOC ratio decreased by stimulating autotrophic processes (particulate primary production (PPP) and EOC) in the heterotrophic nearshore area, whereas BCD:EOC increased by stimulating heterotrophic processes [heterotrophic bacterial production (HBP), bacterial growth efficiency (BGE), bacterial respiration (BR)] in the autotrophic open sea. Our results show that this spatial pattern could be reversed under future UVR x Dust scenario. Overall, the impact of greater dust deposition and higher UVR levels will alter the phytoplankton-bacteria C-flux with consequences for the productivity of both communities, their standing stocks, and ultimately, the ecosystem's metabolic balance at the sea surface.
英文关键词	Heterotrophic bacterial carbon demand Heterotrophic bacterial production Primary production Saharan dust pulse Ultraviolet radiation
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001228615400001
WOS关键词	DISSOLVED ORGANIC-CARBON ; PARTICULATE PRIMARY PRODUCTION ; PHOTOSYNTHETIC PRODUCTION ; ATMOSPHERIC DEPOSITION ; MULTIPLE STRESSORS ; GROWTH EFFICIENCY ; MARINE ; OCEAN ; METABOLISM ; BIOMASS
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405486
推荐引用方式 GB/T 7714	Carrillo, Presentacion,Gonzalez-Olalla, Juan Manuel,Cabrerizo, Marco J.,et al. Uneven response of phytoplankton-bacteria coupling under Saharan dust pulse and ultraviolet radiation in the south-western Mediterranean Sea[J],2024,927.
APA	Carrillo, Presentacion,Gonzalez-Olalla, Juan Manuel,Cabrerizo, Marco J.,Villar-Argaiz, Manuel,&Medina-Sanchez, Juan Manuel.(2024).Uneven response of phytoplankton-bacteria coupling under Saharan dust pulse and ultraviolet radiation in the south-western Mediterranean Sea.SCIENCE OF THE TOTAL ENVIRONMENT,927.
MLA	Carrillo, Presentacion,et al."Uneven response of phytoplankton-bacteria coupling under Saharan dust pulse and ultraviolet radiation in the south-western Mediterranean Sea".SCIENCE OF THE TOTAL ENVIRONMENT 927(2024).