Latitudinal and meridional patterns of picophytoplankton variability are contrastingly associated with Ekman pumping and the warm pool in the tropical western Pacific

doi:10.1002/ece3.10589

IOCAS-IR

	Latitudinal and meridional patterns of picophytoplankton variability are contrastingly associated with Ekman pumping and the warm pool in the tropical western Pacific
	Wang, Yu 1; Zhao, Feng 2; He, Xuebao 1; Wang, Weibo 1; Chang, Lin 1; Kang, Jianhua 1
	2023-10-01
发表期刊	ECOLOGY AND EVOLUTION
ISSN	2045-7758
卷号	13 期号:10 页码:21
通讯作者	Kang, Jianhua(kangjianhua@tio.org.cn)
摘要	Marine picophytoplankton plays a major role in marine cycling and energy conversion, and its effects on the carbon cycle and global climate change have been well documented. In this study, we investigated the response of picophytoplankton across a broad range of physicochemical conditions in two distinct regions of the tropical western Pacific. Our analysis considered the abundance, carbon biomass, size fraction, distribution, and regulatory factors of the picophytoplankton community, which included the cyanobacteria Prochlorococcus and Synechococcus, and small eukaryotic phytoplankton (picoeukaryotes). The first region was a latitudinal transect along the equator (142-163(degrees) E, 0(degrees) N), characterized by stratified oligotrophic conditions. The second region was a meridional transect (143(degrees) E, 0-22(degrees)N) known for its high-nutrient and low-chlorophyll (HNLC) conditions. Results showed that picophytoplankton contributed >80% of the chlorophyll a (Chl a), and was mainly distributed above 100 m. Prochlorococcus was the dominant organism in terms of cell abundance and estimated carbon biomass in both latitudinal and meridional transects, followed by Synechococcus and picoeukaryotes. In the warm pool, Prochlorococcus was primarily distributed below the isothermal layer, with the maximum subsurface abundance forming below it. The maximum Synechococcus abundance was restricted to the west-warm pool, due to the high temperature, and the second-highest Synechococcus abundance was associated with frontal interaction between the east-warm pool and the westward advance of Middle East Pacific water. In contrast, picoeukaryotes formed a maximum subsurface abundance corresponding to the subsurface Chl a maximum. In the mixed HNLC waters, the cell abundance and biomass of the three picophytoplankton groups were slightly lower than those in the warm pool. Due to a cyclonic eddy, the contours of the maximum subsurface Prochlorococcus abundance were uplifted, evidently with a lower value than the surrounding water. Synechococcus abundance varied greatly in patches, forming a weakly high subsurface peak when the isothermal layer rose to the near-surface (<50 m). The subsurface maximum picoeukaryote abundance was also highly consistent with that of the subsurface Chl a maximum. Correlation analysis and generalized additive models of environmental factors showed that nutrient availability had a two-faceted role in regulating the spatial patterns of picophytoplankton in diverse latitudinal and meridional environments. We concluded through regression that temperature and light irradiance were the key determinants of picophytoplankton variability in the tropical western Pacific. This study provides insights into the changing picophytoplankton community structure with potential future changing hydroclimatic force.
关键词	Ekman pumping mesoscale eddy picophytoplankton spatial variability tropical western Pacific warm pool
DOI	10.1002/ece3.10589
收录类别	SCI
语种	英语
资助项目	The authors acknowledge Dr. Senming Tang from Hong Kong University for the fruitful discussion and for helping to revise the manuscript. Thanks to the team workers from the Institute of Oceanography for nutrient analysis. We would like to thank Editage ()[2022YFC2804003] ; The authors acknowledge Dr. Senming Tang from Hong Kong University for the fruitful discussion and for helping to revise the manuscript. Thanks to the team workers from the Institute of Oceanography for nutrient analysis. We would like to thank Editage ()[2022YFC3102401] ; National Key and Development Program of China[41506217] ; National Key and Development Program of China[41506136] ; National Key and Development Program of China[41306115] ; National Natural Science Foundation of China[GASI-01-02-04] ; Project of Ministry of Science and Technology
WOS研究方向	Environmental Sciences & Ecology ; Evolutionary Biology
WOS类目	Ecology ; Evolutionary Biology
WOS记录号	WOS:001085882600001
出版者	WILEY
WOS关键词	MARINE CYANOBACTERIA PROCHLOROCOCCUS ; PHYTOPLANKTON COMMUNITY STRUCTURE ; CHLOROPHYLL-A CONCENTRATION ; EQUATORIAL PACIFIC ; AUTOTROPHIC PICOPLANKTON ; SYNECHOCOCCUS ABUNDANCE ; HETEROTROPHIC BACTERIA ; SURFACE CHLOROPHYLL ; ATLANTIC-OCEAN ; WATER MASSES
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/181538
专题	中国科学院海洋研究所
通讯作者	Kang, Jianhua
作者单位	1.Minist Nat Resources, Inst Oceanog 3, Xiamen 361005, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yu,Zhao, Feng,He, Xuebao,et al. Latitudinal and meridional patterns of picophytoplankton variability are contrastingly associated with Ekman pumping and the warm pool in the tropical western Pacific[J]. ECOLOGY AND EVOLUTION,2023,13(10):21.
APA	Wang, Yu,Zhao, Feng,He, Xuebao,Wang, Weibo,Chang, Lin,&Kang, Jianhua.(2023).Latitudinal and meridional patterns of picophytoplankton variability are contrastingly associated with Ekman pumping and the warm pool in the tropical western Pacific.ECOLOGY AND EVOLUTION,13(10),21.
MLA	Wang, Yu,et al."Latitudinal and meridional patterns of picophytoplankton variability are contrastingly associated with Ekman pumping and the warm pool in the tropical western Pacific".ECOLOGY AND EVOLUTION 13.10(2023):21.

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