上海海洋大学学报2025，Vol.34Issue(5)：1171-1185,15.DOI:10.12024/jsou.20250404817
杭州湾沉积物中生物群落-生境要素-污染物分布特征及响应规律
Characteristics of biological communities-habitat elements-pollutants distribution and response pattern in Hangzhou Bay sediments
摘要
Abstract
By the environmental DNA(eDNA)technique and physicochemical parameter analyses,the spatial distribution characteristics of biological community structure,habitat elements and pollutants in the surface sediments of Hangzhou Bay and their impacts on biodiversity were systematically analysed.A total of 53 phyla were identified,with Metazoa dominating(42.55％),notably the key species Portunus trituberculatus(20.84％),indicating strong keystone species-driven community assembly.Biodiversity exhibited distinct spatial gradients:species richness indices(Observed species:513-3 169;Chao1:777.33-4 185.46)decreased southward,while evenness(Pielou J:0.05-0.79)and diversity(Shannon:0.31-6.01)showed a north-high,central-low,and south-moderate pattern.The spatial differentiation of sediment grain size[mainly silt,(70.72±1.94)％]and TOC[(0.20±0.06)％]and TN[(0.06±0.01)％]showed that coarse-grained substrate drove community homogenisation by optimising crab habitat conditions,whereas C/N ratios(3.12±0.83)indicated the dominance of sea-sourced organic matter,and areas of high values of TOC and TN coincided with algal and protozoan dominance coincided.The analysis of contaminants showed that the contaminants in Hangzhou Bay sediments generally showed a decreasing offshore diffusion gradient,of which DDTs[(9.45±1.68)ng/g],brominated flame retardants were dominated by NBFRs(76.7％),BDE209 accounted for more than 71％of the PBDEs,and the PFCs and polyfluoroalkyl substances(PFCAs accounted for 87.9％of the PFCAs)were relatively homogeneously distributed in the sediment due to their high water solubility.The distribution of perfluorinated and polyfluorinated alkyl substances(including 87.9％of PFCAs)is relatively uniform in sediments due to high water solubility.The spatial heterogeneity of habitat elements and pollutants was shaped by tidal dynamics and land-based emissions.By integrating macro-scale redundancy analysis(RDA)and micro-ecological mechanism analysis,a synergistic pattern-mechanism verification system was constructed in Hangzhou Bay.The macro-scale RDA reveals the response of biological community diversity to multi-dimensional environmental gradients,while the micro-scale RDA illustrates the differential driving effects of pollutants and environmental factors on functional communities.The mutual validation of the two systems shows that the cross-scale mutual feedback mechanism is the core pathway to analyse the emergent characteristics of ecosystems,and provides a scientific basis for the multi-stress synergistic management of large-scale strong tidal estuarine ecosystems.关键词
沉积物/生物群落/生境要素/污染物/生物多样性/冗余分析/杭州湾Key words
sediment/biological community/habitat elements/pollutants/biodiversity/redundancy analysis/Hangzhou Bay分类
生物科学引用本文复制引用
刘思如,刘昕怡,袁佳文,毛佳丽,丰美萍,王丽芳,林田..杭州湾沉积物中生物群落-生境要素-污染物分布特征及响应规律[J].上海海洋大学学报,2025,34(5):1171-1185,15.基金项目
国家重点研发计划(2023YFD2401901) （2023YFD2401901）
国家自然科学基金(42476245) （42476245）
