Standing crop and size structure of phytoplankton are strongly regulated by the turbidity maximum in the macrotidal Qiantang River estuary-Hangzhou Bay

被引：0

作者：

Zhan, Lin ^{[1
]}

Zhu, Yuanli ^{[1
,3
,4
]}

Xu, Chaoxiang ^{[2
]}

Du, Wei ^{[2
]}

Yang, Zhi ^{[1
]}

Jiang, Yulu ^{[1
]}

Jia, Kangning ^{[1
]}

Du, Ping ^{[1
,3
,4
]}

Han, Chenhua ^{[1
]}

Huang, Wei ^{[1
,3
,4
]}

Zeng, Jiangning ^{[1
,3
]}

Jiang, Zhibing ^{[1
,2
,3
,4
]}

机构：

[1] Minist Nat Resources, Inst Oceanog 2, Key Lab Marine Ecosyst Dynam, Hangzhou 310012, Peoples R China

[2] Marine Acad Zhejiang Prov, Key Lab Ocean Space Resource Management Technol, Minist Nat Resources, Hangzhou 310012, Peoples R China

[3] Key Lab Nearshore Engn Environm & Ecol Secur Zheji, Hangzhou 310012, Peoples R China

[4] Minist Nat Resources, Observat & Res Stn Marine Ecosyst Yangtze River De, Hangzhou 310012, Peoples R China

来源：

JOURNAL OF OCEANOLOGY AND LIMNOLOGY | 2025年

关键词：

Qiantang River estuary; Hangzhou Bay; turbidity maximum zone; phytoplankton; standing crop; size structure; PARTICULATE ORGANIC-MATTER; ENVIRONMENTAL-FACTORS; COMMUNITY; BIOMASS; ZONE; ZOOPLANKTON; ACCUMULATION; SALINITY; PATTERNS; PIGMENTS;

D O I：

10.1007/s00343-024-4133-6

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The turbidity maximum zone (TMZ) is a distinctive aquatic environment marked by consistently higher turbidity compared to upstream and downstream section. In the TMZ, physicochemical properties such as intense light limitation, abundant nutrients, and rapid salinity shifts play a crucial role in shaping phytoplankton dynamics. The Qiantang River estuary-Hangzhou Bay (QRE-HZB) is a macrotidal estuary system known for its exceptionally high suspended solids concentration. To investigate the impact of TMZ on the standing crop and size structure of phytoplankton in the QRE-HZB, we conducted three cruises in dry, wet, and dry-to-wet transition seasons during 2022-2023, by assessing parameters including size-fractionated chlorophyll a (chl a), turbidity, Secchi depth, temperature, salinity, nutrients, and mesozooplankton. Results reveal significant variations in the TMZ and associated environmental factors in different periods, which markedly influenced the phytoplankton chl-a concentration, size structure, and cell activity (pheophytin/chl a). The chl-a concentration was high with micro-phytoplankton predominance in wet season, while nano-phytoplankton dominated in dry season. Within the TMZ, lower chl-a concentrations and pico-chl-a contributions, alongside higher pheophytin/chl-a and micro-chl-a contributions, were observed. The Spearman's rank correlation and generalized additive model analyses indicated strong correlations of chl-a concentrations with turbidity, nutrients, and mesozooplankton. Redundancy analysis further revealed that salinity, nutrients, and turbidity significantly regulated variations in size structure. Phytoplankton mortality within the TMZ was primarily driven by high turbidity and salinity fluctuations, reflecting the vigorous resuspension and mixing of freshwater and seawater in the QRE-HZB. These findings highlight that the standing crop and size structure of phytoplankton were strongly regulated by the TMZ and associated physicochemical factors in the macrotidal QRE-HZB.

引用

页数：16