Synchronous responses to tidal restriction by seawall construction across fish and plankton communities in Yangtze River Estuary

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

Marine environmental research Pub Date : 2025-06-16 DOI:10.1016/j.marenvres.2025.107312

Jiayi Fan , Jianan Li , Yusen Xie , Haoran Zhang , Xiaodong Jiang

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Abstract

Tidal restriction caused by seawall construction exerts profound impacts on coastal wetland ecosystems, typically aimed at restoring vegetation and avian diversity. However, studies on non-target aquatic organisms under tidal restriction remain scarce. In our study, we hypothesized congruent responses of fish, zooplankton, and phytoplankton communities to tidal restriction between naturally unrestricted creeks and tide-restricted marshlands in Chongming Dongtan, Yangtze River Estuary. Shifts in community structure were observed across all three taxonomic groups but lacked statistical significance, likely due to the early stage of seawall construction and semi-regulated operation of sluices in the Dongtan wetland. Notably, biodiversity disparities emerged primarily in higher trophic levels, with declining trends in fish and zooplankton diversity in tide-restricted areas, whereas phytoplankton communities exhibited comparable diversity between habitats. Structural equation modeling (SEM) revealed a significant negative effect of salinity on fish communities, with no detectable top-down or bottom-up cascading effects in aquatic food chains, further indicating that abiotic factors outweigh biological interactions in governing ecosystem dynamics.

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长江口海堤建设对鱼类和浮游生物群落潮汐限制的同步响应

海堤建设引起的潮汐限制对滨海湿地生态系统产生了深远的影响，其典型目的是恢复植被和鸟类多样性。然而，对潮汐限制下非靶水生生物的研究仍然很少。在长江口崇明东滩，鱼类、浮游动物和浮游植物群落对自然不受限制的小溪和受限制的湿地的潮汐限制的响应是一致的。3个类群的群落结构均发生了变化，但缺乏统计学意义，这可能是由于东滩湿地海堤建设阶段较早，水闸半调节运行所致。值得注意的是，生物多样性差异主要出现在较高的营养水平，在限潮区，鱼类和浮游动物的多样性呈下降趋势，而浮游植物群落在不同栖息地之间表现出相当的多样性。结构方程模型（SEM）揭示了盐度对鱼类群落的显著负面影响，在水生食物链中没有检测到自上而下或自下而上的级联效应，进一步表明非生物因素在控制生态系统动态方面超过了生物相互作用。

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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.