SCSIO OpenIR  > 中科院海洋生物资源可持续利用重点实验室
Fast acclimation of phytoplankton assemblies to acute salinity stress in the Jiulong River Estuary
Li, Gang1
2019
Source PublicationACTA OCEANOLOGICA SINICA
ISSN0253-505X
Volume38Issue:8Pages:78
AbstractMixing of freshwater and seawater creates the well-known salinity gradients along the estuaries. In order to investigate how phytoplankton respond to the acute salinity changes, we exposed natural phytoplankton assemblies from the Jiulong River Estuary to differential saline field water while continuously monitoring their photosynthetic performances under both indoor- and outdoor-growth conditions. When the natural cell assemblies from salinity 30 field water were exposed to series low saline field water (salinity 25, 17, 13 and 7.5), the effective Photosystem II quantum yield (Delta F/F-m(')) decreased sharply, e.g., to one-fifth of its initials after 5 min exposure to salinity 7.5 field water, and then increased fast during the following 40 min and almost completely recovered after 320 min. During such an exposure process, non-photochemical quenching (NPQ) sharply increased from 0 to 0.85 within 5 min, and then decreased to nearly 0 within the following 70 min. When these cells re-acclimated to salinity 7.5 field water were exposed to series high saline field water (salinity 13, 17, 25 and 30), a similar response pattern was observed, with the decreased Delta F/F-m(') accompanied with increased NPQ, and followed by the recovery-induced increase in Delta F/F-m(') and decrease in NPQ. A similar response pattern as Delta F/F-m(') to the acute osmotic stress was also observed in the photosynthetic carbon fixation capacity according to radiocarbon (C-14) incorporation. Our results indicate that estuarine phytoplankton assemblies could rapidly recover from the acute osmotic stress, implying a potential cause for their frequent blooms in coastal-estuarine waters where despite drastically varying salinity, available nutrients are abundant due to the land-derived runoffs or mixing-caused relaxations from sediments.
DepartmentLMB
KeywordPSII quantum yield carbon fixation salinity gradients phytoplankton assemblies Jiulong River Estuary
DOI10.1007/s13131-019-1389-3
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Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17801
Collection中科院海洋生物资源可持续利用重点实验室
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China
2.Chinese Acad Sci, South China Sea Inst Oceanol, Guangdong Prov Key Lab Appl Marine Biol, Guangzhou 510301, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Li, Gang. Fast acclimation of phytoplankton assemblies to acute salinity stress in the Jiulong River Estuary[J]. ACTA OCEANOLOGICA SINICA,2019,38(8):78, 85.
APA Li, Gang.(2019).Fast acclimation of phytoplankton assemblies to acute salinity stress in the Jiulong River Estuary.ACTA OCEANOLOGICA SINICA,38(8),78.
MLA Li, Gang."Fast acclimation of phytoplankton assemblies to acute salinity stress in the Jiulong River Estuary".ACTA OCEANOLOGICA SINICA 38.8(2019):78.
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