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Effects of nutrient limitations on the sinking velocity of Thalassi-osira weissflogii

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The sinking of diatoms is critical to the formation of oceanic biological pumps and coastal hypoxic zones.However,little is known about the effects of different nutrient restrictions on diatom sinking.In this study,we measured the sinking velocity(SV)of Thalassiosira weissflogii using a new phytoplankton video observation instrument and analyzed major biochemical components under varying nutrient conditions.Our results showed that the SV of T.weissflogii under different nutrient limitation conditions varied substantially.The highest SV of(1.77±0.02)m/d was obtained under nitrate limitation,significantly surpassing that under phosphate limitation at(0.98±0.13)m/d.As the nutrient limitation was released,the SV steadily decreased to(0.32±0.03)m/d and(0.15±0.05)m/d,respectively.Notably,under conditions with limited nitrate and phosphate concentrations,the SV values of T.weissflogii significantly positively correlated with the lipid content(P＜0.001),with R2 values of 0.86 and 0.69,respectively.The change of the phytoplankton SV was primarily related to the intracellular composition,which is controlled by nutrient conditions but did not significantly correlate with transparent extracellular polymer and biosilica contents.The results of this study help to understand the regulation of the vertical sinking process of diatoms by nutrient restriction and provide new insights into phytoplankton dynamics and their relationship with the marine nutrient structure.

nutrient limitationThalassiosira weissflogiisinking velocitybiochemical componentlipid content

Jie Zhu、Qiang Hao、Wei Zhang、Yingying Ma、Jiangning Zeng

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Ocean College,Zhejiang University,Zhoushan 316000,China

Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China

Key Laboratory of Marine Ecosystem Dynamics,Ministry of Natural Resources,Hangzhou 310012,China

Zhejiang Key Laboratory of Nearshore Engineering Environment and Ecological Security,Hangzhou 310012,China

Tianjin Key Lab of Aqua-Ecology and Aquaculture,College of Fisheries,Tianjin Agricultural University,Tianjin 300384,China

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Key R&D Program of ZhejiangNational Key Research and Development Program of ChinaNational Programme on Global Change and Air-Sea Interaction(Phase Ⅱ)—Hypoxia and Acidification Monitoring Warning Project inLongterm Observation and Research Plan in the Changjiang Estuary and Adjacent East China Sea(LORCE)Project

DH-2022KF02152021YFC3101702SZ2001

2024

10.1007/s13131-024-2309-8

海洋学报(英文版)
中国海洋学会

海洋学报(英文版)

CSTPCD
影响因子：0.323
ISSN：0253-505X
年,卷(期)：2024.43(6)