The influences of phenology, spatial distribution, and nitrogen form on Long Island Sound phytoplankton biomass and taxonomic composition
The influences of phenology, spatial distribution, and nitrogen form on Long Island Sound phytoplankton biomass and taxonomic composition
复制标题
物候、空间分布和氮形态对长岛湾浮游植物生物量和分类组成的影响
DOI：
10.1016/j.ecss.2023.108451
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Greenfield, Dianne I.
中科院分区：
文献类型：
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作者：
Roldan Ayala, Zabdiel;Arnott, Stephen A.;Ambrosone, Mariapaola;Espinosa, Jessica I.;Humphries, Georgie E.;Tzortziou, Maria;Goes, Joaquim I.;Greenfield, Dianne I.
美国长岛湾（LIS）是一个城市河口，接收过量的氮（N）输入，导致生态系统受损，如缺氧和藻华。尽管氮浓度和全球范围内的藻类水华之间的联系，氮的形式和浮游植物组合在LIS之间的连接仍然不太特征，代表一个重要的信息差距水质管理。本研究评估了2020年3月至2021年10月西部（WLIS），中部（CLIS）和东部LIS（ELIS）浮游植物生物量和丰度，N和其他关键水质参数的时空分布。在这两个研究年，平均溶解无机氮（DIN）浓度显着高于在秋季比其他季节（ANOVA：p< 0.004），与硅藻水华。硅藻在整个研究中是丰富的，尽管WLIS鞭毛虫的数量在7月和8月都有所上升。较小（直径<5 μm）的细胞通常对总体叶绿素（Chla）贡献最大，并且在WLIS和CLIS中夏季生物量显著高于其他季节（ANOVA; WLIS：p< 0.004; CLIS：p< 0.006）。整个LIS，有一个明确的西向东下降的水平，叶绿素a，DIN，和picoplancomatous浮游植物的整体浮游植物生物量的比例的贡献，但是，季节性平均浓度的叶绿素a，营养物质，和其他水质参数之间没有显着差异采样（0.5和2米）的深度，除了ELIS夏季温度和叶绿素a（T检验，bothp= 0.002）。考虑到气候变化的挑战，如温暖的温度提高水华，特别是在富含人为N的系统中，研究结果表明，N管理战略应重新评估跨越LIS的目标。研究结果可能适用于全球其他富营养化城市河口。
Long Island Sound (LIS), USA, is an urban estuary that receives excessive nitrogen (N) inputs resulting in ecosystem impairments, such as hypoxia and algal blooms. Despite established linkages between N concentrations and algal blooms worldwide, connections between N forms and phytoplankton assemblages within LIS remain less characterized, representing a critical information gap for water quality management. This study assessed the spatio-temporal distributions of phytoplankton biomass and abundances, N, and other key water quality parameters Mar-2020 to Oct-2021 in Western (WLIS), Central (CLIS), and Eastern LIS (ELIS). During both study years, mean dissolved inorganic N (DIN) concentrations were significantly higher during fall than other seasons (ANOVA:p< 0.004), coincident with diatom blooms. Diatoms were abundant throughout the study, though WLIS flagellate numbers rose during Jul and Aug both years. Smaller (<5 μm diameter) cells generally contributed most to overall chlorophylla(Chla) and with significantly higher summer biomass in WLIS and CLIS than other seasons (ANOVA; WLIS:p< 0.004; CLIS:p< 0.006). Across LIS, there was a clear west to east decline in levels of Chla, DIN, and the proportional contribution of picoplankton to overall phytoplankton biomass; however, seasonal mean concentrations of Chla, nutrients, and other water quality parameters did not significantly differ between sampling (0.5 and 2 m) depths except for ELIS summer temperature and Chla(T-test; bothp= 0.002). Given climate change challenges, such as warmer temperatures enhancing blooms particularly in systems enriched with anthropogenic N, findings indicate that N-management strategies should re-evaluate targets spanning LIS. Study results are likely applicable to other eutrophic urban estuaries worldwide.