Dual effects of estuarine dams on summertime phytoplankton productivity in temperate river-estuary transition zones

IF 3.2 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research Pub Date : 2025-05-31 DOI:10.1016/j.marenvres.2025.107238

Dongyoung Kim , Tae-Hoon Kim , Chang-Keun Kang , Hyun Je Park

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引用次数: 0

Abstract

The river transports dissolved and particulate matter to the estuary, where physical and biogeochemical transitions occur. In the river-estuary transition zone (RETZ), phytoplankton response is an effective indicator of environmental variability with their immediate responses. Here, we examine summer-monsoonal variability in productivity and nitrogen uptake of phytoplankton in three major Korean rivers and their estuaries: the Han, Geum, and Yeongsan. Results showed that summer-monsoonal variability of primary productivity in dam-constructed RETZ divided them into riverine zone governed by nutrient-phytoplankton interactions and estuarine zone associated with nitrogenous substrate dynamics. In contrast, free-flowing RETZ exhibited lower variability in phytoplankton productivity due to simultaneously enhanced nitrogenous nutrients and turbidity. Our generalized additive model analysis indicated that composition of particulate organic matter is primarily correlated with phytoplankton biomass associated with light availability. Our findings emphasize the complex interplay of physical and biogeochemical processes in RETZ, mainly influenced by monsoonal variability and river-estuary connectivity.

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河口坝对温带河口过渡带夏季浮游植物生产力的双重影响

河流将溶解物质和颗粒物质输送到河口，在那里发生物理和生物地球化学转变。在河口过渡带（RETZ），浮游植物响应是反映环境变异性的有效指标，具有直接的响应。在这里，我们研究了韩国三条主要河流及其河口：汉江、锦江和荣山的浮游植物生产力和氮吸收的夏季季风变化。结果表明，坝建RETZ初级生产力的夏季-季风变率将其划分为营养物-浮游植物相互作用支配的河滨带和含氮底物动态支配的河口带。相比之下，自由流动的RETZ由于氮养分和浊度同时增加，浮游植物生产力变异性较低。我们的广义加性模型分析表明，颗粒有机质的组成主要与浮游植物生物量和光有效性相关。研究结果强调了RETZ的物理和生物地球化学过程的复杂相互作用，主要受季风变率和河口连通性的影响。

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来源期刊

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.