Journal of Great Lakes Research最新文献_第2页

Invasion dynamics and impact of non-native molluscs in the Laurentian Great Lakes 劳伦森五大湖非本地软体动物的入侵动态及其影响

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2025.102706

Alexander Y. Karatayev , Lyubov E. Burlakova

The abundances of non-native species in invaded ecosystems can range from negligible to extremely high, and their effects include competition with and predation on native species, habitat alteration, and the transmission of diseases. Currently, 16 non-native mollusc species are established in the Laurentian Great Lakes, including 14 exotics introduced from other continents and two North American transplants. These species represent 52% of the diversity of all free-living non-native benthic invertebrates in the lakes. Early introductions (Bithynia tentaculata, Pisidium moitessierianum, P. amnicum, and Valvata piscinalis) arrived in the 19th century via solid ballast, whereas recent introductions (Dreissena polymorpha, D. rostriformis bugensis, and Potamopyrgus antipodarum) were primarily transported in ballast water. Most exotics originated from Eurasia (64%) and Asia (21%), with single species introductions from Europe and New Zealand. Mollusc densities vary greatly from rare (e.g., Corbicula fluminea and Radix auricularia) to extremely high (D. r. bugensis). Non-native mollusc diversity is highest in shallow Lake Erie and lowest in Lake Huron. The ecological impact of exotic species is largely proportional to their population abundance, ranging from negligible (e.g., sphaeriids, C. fluminea, and Radix auricularia) to the substantial effects from D. r. bugensis, which has transformed entire ecosystems in the four lower Great Lakes. We also examine potential future invaders (e.g., Limnoperna fortunei) and project their likely distributions and impacts. Ongoing and projected temperature increases will likely enhance conditions for currently restricted species and increase the risk of new introductions from warmer regions, further accelerating ecosystem change.

在入侵生态系统中，非本地物种的丰度可以从微不足道到极高不等，其影响包括与本地物种竞争和捕食、栖息地改变和疾病传播。目前，劳伦森五大湖有16种非本地软体动物，包括14种从其他大陆引进的外来物种和两种北美移植物种。这些物种占湖泊中所有自由生活的非本地底栖无脊椎动物多样性的52%。早期的引进（Bithynia tentaculata, Pisidium moitessierianum， P. amnicum和Valvata piscinalis）在19世纪通过固体压载物到达，而最近的引进（Dreissena polymorpha， D. rostriformis bugensis和Potamopyrgus antipodarum）主要通过压载水运输。大多数外来物种来自欧亚大陆（64%）和亚洲（21%），还有来自欧洲和新西兰的单一物种引进。软体动物的密度变化很大，从稀有的（如河蚌和木耳）到极高的（布根氏软体动物）。非本土软体动物多样性在浅伊利湖最高，在休伦湖最低。外来物种的生态影响在很大程度上与它们的种群丰度成正比，从微不足道的（如球形植物、C. fluminea和木耳根）到bugensis的重大影响，它们已经改变了四大湖下游的整个生态系统。我们还研究了潜在的未来入侵者（如Limnoperna fortunei），并预测了它们可能的分布和影响。持续的和预计的温度升高可能会改善目前受限制物种的生存条件，增加从温暖地区引入新物种的风险，进一步加速生态系统的变化。

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引用次数: 0

Quagga mussel veliger production, growth, and timing across a depth gradient in southeast Lake Michigan 在密歇根湖东南部的一个深度梯度上，斑驴贻贝的生产、生长和时间

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2025.102705

Steven Pothoven, Ashley K. Elgin

Many aspects of the early life history of quagga mussels Dreissena rostriformis bugensis are poorly understood. Our objectives were to determine: (1) the timing of veliger population development; (2) when veliger settling occurs; and (3) veliger growth rate and production relative to other zooplankton in southeastern Lake Michigan. To accomplish this, we sampled at a nearshore (17-m), mid-depth (45-m), and offshore (110-m) site near Muskegon, Michigan, during October 2020 to April 2024. On average, small veligers (< 100 µm) first appeared in early spring when water temperatures reached 6.6 °C. There was a consistent influx of small veligers in May-June across sites and years, and a second peak in August-September. Larger or competent veliger (> 170 µm) abundance typically peaked in June-July at each site and disappeared in August, indicating settling, and a second peak each year was more variable across sites and years. Veliger growth estimates varied widely (1.42–3.71 µm/d), with an average of 2.39 µm/d, which corresponds to 84 days in the water column assuming lifetime growth from 65 to 250 µm before settling. Annual production of veligers accounted for a higher percentage of secondary production at the nearshore site (22–36 %) than at the mid-depth (1–10 %) or offshore (1–4 %) sites. Overall veliger production across sites and years was 0.69 g/m²/y (range = 0.22–1.43 g/m²/y). Veligers account for a high percentage of nearshore plankton biomass during their summer and early fall population peaks. Given their ephemeral yet substantial prevalence in the water column, veligers are an important food web component to monitor and understand.

对斑驴贻贝早期生活史的许多方面了解甚少。我们的目标是确定：(1)人口发展的时间；(2) veliger沉降发生时；(3)与其他浮游动物相比，密歇根湖东南部浮游动物的生长速率和产量。为了实现这一目标，我们在2020年10月至2024年4月期间，在密歇根州马斯基根附近的近岸（17米）、中深（45米）和海上（110米）地点进行了采样。平均而言，当水温达到6.6°C时，初春首先出现小分枝（< 100µm）。在不同地点和年份的5 - 6月，小恙虫持续涌入，8 - 9月是第二个高峰。较大或充足的veliger （> 170µm）丰度通常在6 - 7月达到峰值，并在8月消失，表明沉降，并且每年的第二个峰值在不同地点和年份之间变化更大。Veliger生长估计差异很大（1.42-3.71µm/d），平均为2.39µm/d，相当于在水柱中84天，假设在沉降前的寿命增长从65µm到250µm。近岸地区veligers的年产量占二次产量的比例（22 - 36%）高于中深水地区（1 - 10%）或近海地区（1 - 4%）。不同地点和年份的总体细菌产量为0.69 g/m2/y（范围为0.22-1.43 g/m2/y）。在夏季和初秋的种群高峰期间，长尾鱼占近岸浮游生物生物量的百分比很高。鉴于它们在水柱中短暂但大量流行，veligers是监测和了解食物网的重要组成部分。

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引用次数: 0

Diet and prey preference of alewife Alosa pseudoharengus in Lake Ontario in 2012 and 2013 2012年和2013年安大略湖Alosa pseudoharengus的食性和猎物偏好

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2025.102731

Brent W. Metcalfe , Mary F. Hanley , Kelly L. Bowen , Julie Munro , Ana C. Taraborelli , Timothy B. Johnson

Alewife (Alosa pseudoharengus), a small planktivorous fish, serve as an important link between lower and upper trophic levels in Lake Ontario. They are the most abundant fish species in the lake, and most piscivorous fishes prey upon them. Changes in composition or productivity at the base of the food web may impact alewife feeding and production, and implications for the wider fish community could be significant. As such, understanding the trophic relationship between alewife and their prey may serve as a barometer for the overall health of the Lake Ontario food web. In 2012 and 2013, we examined alewife stomach contents seasonally, regionally, and between two size-classes to determine if on-going lower trophic level community changes (e.g., expanded invasive mussel distribution and nutrient filtration / sequestration, increased abundance of invasive cladocerans, reduced epilimnetic zooplankton abundance) have impacted alewife diets since previous published diet descriptions from Lake Ontario. We observed no difference in relative biomass of prey consumed between size-classes of alewife, nor among regions of the lake. We did note seasonal increases in relative prey biomass, with the greatest relative biomass in the fall. Taxonomically, diets were dominated by invasive predatory cladocerans (Bythotrephes longimanus and Cercopagis pengoi) and electivity indices suggested that alewife were selecting for invasive predatory cladocerans more than any other prey type. A shift in reliance from Mysis diluviana and other native zooplankton to invasive predatory cladocerans could foreshadow changes in distribution and production of alewife.

Alewife （Alosa pseudoharengus）是一种小型的浮游食性鱼类，是安大略湖中低营养层和高营养层之间的重要纽带。它们是湖中最丰富的鱼类，大多数食鱼鱼类都以它们为食。食物网底部组成或生产力的变化可能会影响大灰鲭鱼的喂养和生产，对更广泛的鱼类群落的影响可能是重大的。因此，了解alewife和它们的猎物之间的营养关系可以作为安大略湖食物网整体健康的晴雨表。在2012年和2013年，我们季节性地、区域性地、在两个大小类别之间检查了灰鲭鱼胃内容物，以确定自之前发表的安大略湖饮食描述以来，持续的低营养水平群落变化（例如，入侵贻贝分布和营养物质过滤/封存的扩大、入侵枝海生物丰度的增加、浮游动物丰度的减少）是否影响了灰鲭鱼的饮食。我们观察到在不同大小类别的大灰鲱之间，以及在湖泊的不同区域之间，猎物的相对生物量没有差异。我们确实注意到相对猎物生物量的季节性增加，其中秋季的相对生物量最大。从分类学上看，大灰尾鱼的食性主要为入侵掠食性枝目动物（Bythotrephes longimanus和Cercopagis pengoi），选择性指数表明大灰尾鱼对入侵掠食性枝目动物的选择性高于其他食性类型。从对diluviana和其他本地浮游动物的依赖转向入侵的掠食性枝海动物，可能预示着alefish分布和生产的变化。

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引用次数: 0

Alongshore transport gradients at Long Point in Lake Erie 伊利湖长点沿岸运输梯度

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2026.102748

Chris Houser, Cooper O’Rourke, Elizabeth George

The evolution and future resiliency of Long Point, a barrier spit on the north shore of Lake Erie, is associated with the eastward alongshore transport of sediment liberated from retreating till bluffs to the west of the spit. Despite a substantial amount of sediment deposited into the littoral cell, Long Point has experienced shoreline retreat and dune scarping over the last decade. This short communication quantifies changes in the wave climate and alongshore sediment transport across the littoral cell to explore how Long Point can be sediment starved despite a sediment rich littoral cell. Between 1980 and 2010, the shorelines at the proximal and distal ends of the spit accreted, with shoreline accretion along the spit between 2006 and 2010. Between 2010 and 2020, shoreline retreat was observed over the entire length of the spit, in response to a change in the alongshore transport gradients with an increase in wave energy. Consequently, less sediment is delivered to the proximal end of the spit through bar attachment and the alongshore migration of sand waves. Management strategies and potential for nature-based solutions to return sediment to the littoral zone require further study on the fate of the bluff material and the specific mechanisms of how it is transported within the immediate littoral cell.

长点是伊利湖北岸的一个堰洲沙口，它的演变和未来的恢复能力与沙口西边的悬崖上的沉积物从后退中释放出来的向东沿海岸移动有关。尽管有大量的沉积物沉积在沿海细胞中，但在过去的十年里，长点经历了海岸线退缩和沙丘陡降。这种简短的通信量化了波浪气候的变化和沿海沉积物在沿海细胞中的运输，以探索长点如何在沉积物丰富的沿海细胞中缺乏沉积物。1980 - 2010年，沙嘴近端和远端海岸线均出现增生，2006 - 2010年沙嘴沿岸出现增生。2010年至2020年期间，随着波浪能的增加，沿岸运输梯度发生变化，在整个吐槽长度上观察到海岸线退缩。因此，较少的泥沙通过沙洲附着物和沙波沿岸迁移输送到沙嘴的近端。管理策略和以自然为基础的解决办法将沉积物送回沿岸带的潜力需要进一步研究钝岩物质的命运及其如何在沿岸细胞内运输的具体机制。

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引用次数: 0

Nearly 50 years of water quality monitoring shows improvements and remaining challenges for a delisted Great Lakes Area of Concern 近50年的水质监测显示，一个被除名的大湖区的水质有所改善，但仍面临挑战

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2025.102704

Alana Tyner , Aisha Chiandet , Andrea Kirkwood

Severn Sound, located in Lake Huron, is one of nine (out of 43) Areas of Concern (AOC) that have been delisted. In 1987, Severn Sound was designated an AOC due to eutrophication and habitat loss, and after mitigation measures, was delisted in 2003. Information used to delist Severn Sound was based in part on a long-term water quality program by the Ministry of the Environment and Severn Sound Environmental Association that has been uninterrupted since 1973. Such temporally extensive water quality programs are rare in the Great Lakes, especially those that capture decadal periods of environmental change driven by government regulations, species invasions, and climate change. To improve our understanding of long-term water quality in Severn Sound, we applied a suite of statistical methods to assess trends and patterns of change across four embayments from 1973 to 2020 for the following water quality variables: chlorophyll a, ammonia + ammonium, nitrate + nitrite, total organic nitrogen, total nitrogen, total phosphorus, Secchi disk visibility, and water temperature. We found that the embayments in Severn Sound have significant differences across stations in water quality parameters such as total phosphorus, total nitrogen, Secchi disk visibility, and water temperature. Overall decreases in total phosphorus and chlorophyll a and increases in Secchi disk visibility illustrate the influences of nutrient reduction strategies and potential influences from invasive dreissenid mussels. Although an important driver of water quality changes, surface water temperature change was variable during the study, likely due to site-specific differences and inherent data variability over time.

位于休伦湖（Lake Huron）的塞文湾（Severn Sound）是被摘牌的9个（43个）关注区域（AOC）之一。1987年，由于富营养化和栖息地丧失，塞文湾被指定为AOC，在采取缓解措施后，于2003年摘牌。将塞文湾除名的信息部分是基于环境部和塞文湾环境协会的一项长期水质计划，该计划自1973年以来一直没有中断过。在五大湖地区，这种时间跨度如此之大的水质项目是罕见的，尤其是那些捕捉到政府法规、物种入侵和气候变化所导致的环境变化的十年周期的项目。为了提高对塞文湾长期水质的认识，我们应用了一套统计方法，评估了1973 - 2020年四个河口的以下水质变量的趋势和变化模式：叶绿素a、氨+铵、硝酸盐+亚硝酸盐、总有机氮、总氮、总磷、塞奇盘可见度和水温。研究发现，塞文湾各站位的总磷、总氮、塞奇盘能见度和水温等水质参数存在显著差异。总磷和叶绿素a的总体下降和Secchi盘可见度的增加说明了营养减少策略的影响和入侵贻贝的潜在影响。虽然是水质变化的重要驱动因素，但地表水温度变化在研究期间是可变的，这可能是由于特定地点的差异和固有数据随时间的变化。

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引用次数: 0

Dissolved organic matter connectivity of a complex river–lake system: Insights from the Ganjiang River delta of Poyang Lake, China 复杂江湖体系的溶解有机质连通性——来自鄱阳湖赣江三角洲的启示

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2025.102739

Liying Zhu , Dazhou Hu , Song Xia , Bing Yan , Qiyang Wu , Shuanglin Gui , Amir Hossein Hamidian , Yuansong Wei

River-lake confluence areas experience strong hydrodynamic fluctuations that complicate water-quality assessment, and conventional monitoring metrics often fail to capture the biogeochemical signatures required for pollution source discrimination. To address this limitation, this study investigated the Ganjiang River delta, the major inflow system of Poyang Lake, by refining its hydrological regime into four periods: river discharge (RDP), high lake level (HLP), lake discharge (LDP), and low lake level (LLP). Water quality and dissolved organic matter (DOM) characteristics were examined to evaluate the diagnostic potential of DOM for source identification. Water-quality parameters exhibited marked temporal variations: turbidity, total nitrogen (TN), ammonia–nitrogen (NH₃-N), and total phosphorus (TP) all peaked during LLP, with TN and TP exceeding Class III standards across all periods. Conductivity tracked hydrodynamic shifts, and dissolved organic carbon (DOC) was elevated during LDP. However, none of these physicochemical indicators differentiated water masses from individual tributaries, confirming their limited capability for source tracing. In contrast, excitation–emission matrix fluorescence and parallel factor analysis (PARAFAC) modeling resolved five DOM components (C1–C5), including terrestrial humic-like (C1, C2), mixed terrestrial–biogenic (C3), and protein-like (C4, C5) fractions. DOM indices (fluorescence index (FI), biological index (BIX), and humification index (HIX)) indicated a transition from mixed terrestrial-autochthonous contributions during RDP-LDP toward pronounced autochthonous dominance during LLP, reflecting reduced flushing and enhanced microbial production. Principal component analysis and classification tree modeling showed that C2 and C5 effectively distinguished tributary water sources, achieving over 60% classification accuracy. These findings demonstrate that DOM provides a sensitive tool for pollution source identification, offering support for ecological management in hydrologically dynamic river–lake systems.

江河-湖泊汇合处经历了强烈的水动力波动，使水质评估复杂化，传统的监测指标往往无法捕捉到污染源识别所需的生物地球化学特征。为了解决这一问题，本研究对鄱阳湖主要入流系统赣江三角洲进行了调查，将其水文状态细化为4个时期：河流量（RDP）、高湖水位（HLP）、湖流量（LDP）和低湖水位（LLP）。考察了水质和溶解有机物（DOM）特征，评价了DOM在水源鉴定中的诊断潜力。水质参数表现出明显的时间变化，浊度、总氮（TN）、氨氮（NH3-N）和总磷（TP）均在LLP期间达到峰值，TN和TP均超过III类标准。电导率跟踪流体动力变化，溶解有机碳（DOC）在LDP过程中升高。然而，这些物理化学指标都不能将水体与单个支流区分开来，证实了它们的溯源能力有限。相比之下，激发-发射矩阵荧光和平行因子分析（PARAFAC）模型分解了5种DOM成分（C1 - C5），包括陆地腐殖质（C1, C2），陆地-生物混合（C3）和蛋白质样（C4, C5）部分。DOM指数（荧光指数（FI）、生物指数（BIX）和腐殖化指数（HIX））表明，在RDP-LDP期间，陆地和本地的混合贡献向LLP期间明显的本地优势转变，反映了冲刷减少和微生物生产增加。主成分分析和分类树建模结果表明，C2和C5能够有效区分支流水源，分类准确率达到60%以上。这些结果表明，DOM为污染源识别提供了一个敏感的工具，为水文动态河湖系统的生态管理提供了支持。

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引用次数: 0

Polycyclic aromatic compounds in freshwater ecosystems following non-invasive remediation of controlled diluted bitumen spills: The Freshwater Oil Spill Remediation Study (FOReSt) at the Experimental Lakes Area, Canada 控制稀释沥青泄漏后淡水生态系统中的多环芳香族化合物：加拿大实验湖区的淡水溢油修复研究（森林）

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2025.102730

Vince P. Palace , Madeline J. Stanley , Lisa E. Peters , Lauren Timlick , Gregg Tomy , Sonya Havens , José Luis Rodríguez Gil , Elliott Taylor

Freshwater oil spills are a public concern, and evaluating and improving cleanup procedures under realistic field situations is needed. The International Institute for Sustainable Development-Experimental Lakes Area (IISD-ELA) in northwestern Ontario, Canada, compared the efficacy of non-invasive methods for remediating oil spills in freshwater shorelines. In 2019, six enclosed areas (5 x 10 m) of lake shoreline received controlled spills of weathered diluted bitumen (dilbit). Primary recovery using freshwater flushing and removal of free-floating oil with absorptive media was performed after 96 h, to simulate response times in remote areas. Secondary remediation was performed using enhanced Monitored Natural Recovery (eMNR) or the shoreline washing agent (SWA) Corexit EC9580A, before continued monitoring over 411 d. A reference enclosure was treated with the primary remediation method but had no dilbit or secondary remediation applied. Primary recovery was quantified gravimetrically, while secondary remediation was assessed using detailed analysis of polycyclic aromatic compounds (PACs) and their alkylated analogues in water and sediments. Concentrations of PACs in water, primarily 2-, 3- and 4-ring compounds, peaked 6 d after oil was applied in the enclosures secondarily treated with eMNR (∼7270 ng L⁻¹) and SWA (∼8810 ng L⁻¹). A second peak on day 20 followed a large precipitation event, but PACs declined to near background concentrations (<200 ng L⁻¹) ∼ 70 d after oil was applied. Secondary treatment with SWA modestly improved primary oil recovery, but eMNR appears to be an effective method for mitigating impacts of PACs on aquatic habitats after an oil spill.

淡水溢油是公众关注的问题，需要在实际的现场情况下评估和改进清理程序。位于加拿大安大略省西北部的国际可持续发展实验湖区研究所（IISD-ELA）比较了非侵入性方法在淡水海岸线修复石油泄漏的效果。2019年，六个封闭的湖岸线区域（5 x 10米）受到风化稀释沥青（稀释沥青）的控制泄漏。为了模拟偏远地区的响应时间，96小时后进行了淡水冲洗和吸附介质去除浮油的首次采油。在继续监测411 d之前，使用增强型监测自然恢复（eMNR）或海岸线清洗剂（SWA） Corexit EC9580A进行二次修复。使用一次修复方法处理参考围栏，但没有使用稀释沥青或二次修复。通过对水和沉积物中多环芳香族化合物（PACs）及其烷基化类似物的详细分析，对二级修复进行了评估。在eMNR （~ 7270 ng L−1）和SWA （~ 8810 ng L−1）二次处理的外壳中，在涂油后6天，水中pac的浓度（主要是2-、3-和4环化合物）达到峰值。在大降水事件发生后第20天出现第二个峰值，但施用油后约70 d， PACs下降到接近背景浓度（<200 ng L−1）。SWA的二次处理略微提高了一次原油采收率，但eMNR似乎是一种有效的方法，可以在溢油后减轻pac对水生栖息地的影响。

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引用次数: 0

Historical PFAS trends in the Great Lakes using four decades of archived fish 历史PFAS趋势在五大湖使用四十年的鱼类档案

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2026.102741

Sarah Balgooyen , Michael B. Mahon , Alena Krauss , Henry Sluka , Will J. Backe , Gerald T. Ankley , Ryan F. Lepak

Per- and polyfluoroalkyl substances (PFASs) have been manufactured since the 1940s, but environmental monitoring of these chemicals did not begin until the early 2000s, making historical trends of PFAS concentrations difficult to determine. This study uses archived whole lake trout (Salvelinus namaycush) and walleye (Sander vitreus) from the United States Environmental Protection Agency’s Great Lakes Fish Monitoring and Surveillance Program to quantify PFAS bioaccumulation from 1975 to 2020. Analysis of the fish archive revealed that total bioaccumulative PFASs in predator fish peaked around 2008 and have since been decreasing. While PFAS trends in fish tissue are somewhat consistent across lakes, there are differences in fractional contributions of PFASs. For example, the decreasing trends in fish from Lakes Ontario, Erie, Michigan, and Huron are strongly driven by perfluorooctane sulfonate (PFOS), which manufacturers within the United States began phasing out in 2002. In contrast, fish from Lake Superior have relatively stable PFOS concentrations, and the decreasing trend is primarily driven by reduction in long-chain carboxylates. Shifts in manufacturing chemistry are further demonstrated by changes in isomer fingerprints, indicating a shift away from electrofluorination and toward fluorotelomerization. Transition from long- to short-chain sulfonamides is visible in the data, reflecting the phaseout of long-chain PFASs. Reconstructing historical trends can help elucidate how previous PFAS reductions have impacted ecosystems.

自20世纪40年代以来，全氟和多氟烷基物质（PFASs）就已开始生产，但直到21世纪初才开始对这些化学品进行环境监测，因此难以确定PFAS浓度的历史趋势。本研究使用美国环境保护署大湖鱼类监测和监测计划中存档的全湖鳟鱼（Salvelinus namaycush）和红眼鱼（Sander vitreus）来量化1975年至2020年PFAS的生物积累。对鱼类档案的分析显示，捕食鱼的全氟辛烷磺酸总生物蓄积性在2008年左右达到峰值，此后一直在下降。虽然各湖泊鱼类组织中PFAS的趋势在某种程度上是一致的，但PFAS的部分贡献存在差异。例如，来自安大略湖、伊利湖、密歇根湖和休伦湖的鱼类产量下降的趋势在很大程度上是由全氟辛烷磺酸（PFOS）造成的，美国国内的制造商于2002年开始逐步淘汰这种物质。相比之下，苏必利尔湖鱼类的全氟辛烷磺酸浓度相对稳定，其下降趋势主要是由于长链羧酸盐的减少。制造化学的变化通过异构体指纹的变化进一步证明，表明从电氟化转向氟端粒化。从数据中可以看出，长链磺酰胺向短链磺酰胺的过渡反映了长链全氟磺酸的逐步淘汰。重建历史趋势有助于阐明以前PFAS的减少是如何影响生态系统的。

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引用次数: 0

The place of the rapids: Community perspectives on freshwater health, challenges, and opportunities 急流的位置：社区对淡水健康、挑战和机遇的看法

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2025.102727

Ahmed Aziz , Jody-Lynn Rebek , Kamran Abbasov , María Alejandra Pascagasa-Usaquén , Courtney Vaughan , Amber McKay

The Great Lakes provide essential ecological and socio-economic benefits, yet face growing environmental pressures driven by human activities. This study used a mixed-methods approach to explore local perspectives on freshwater health, challenges, and opportunities, including the blue economy, in Sault Ste. Marie, a binational city also known as Baawaating (“the place of the rapids”) located at the outflow of Lake Superior along the St. Marys River. Data were collected via an online survey with community members residing on both the Ontario and Michigan sides of the St. Marys River. The results showed that most residents have meaningful connections to local water systems, primarily through recreational activities like hiking and swimming. Although overall views on water quality and shoreline health were positive, many voiced concerns about issues, such as pollution and climate change, and emphasized shared responsibility for protecting water. Participants highlighted education, outreach, and collective action as essential avenues for fostering greater local care and protection of the water systems. We found that certain demographic characteristics, particularly age, gender, and population group, had an impact on participants’ perspectives and the barriers they are facing. Given its relevance as a socio-economic and environmental opportunity, we also asked participants about the blue economy and found that, although many saw its potential, most were unfamiliar with the concept, highlighting the need for broader community awareness and discussion around its benefits.

五大湖提供了重要的生态和社会经济效益，但也面临着人类活动带来的日益增长的环境压力。本研究采用混合方法，探讨了包括蓝色经济在内的圣路易斯市当地对淡水健康、挑战和机遇的看法。玛丽是一座两国城市，也被称为Baawaating（“激流之地”），位于圣玛丽河沿岸苏必利尔湖的出海口。数据是通过一项在线调查收集的，调查对象是居住在圣玛丽河安大略省和密歇根州两侧的社区成员。结果表明，大多数居民主要通过远足和游泳等娱乐活动与当地的供水系统建立了有意义的联系。尽管对水质和海岸线健康的总体看法是积极的，但许多人对污染和气候变化等问题表示关切，并强调保护水资源的共同责任。与会者强调，教育、外联和集体行动是促进地方更关心和保护水系统的重要途径。我们发现某些人口特征，特别是年龄、性别和人口群体，对参与者的观点和他们面临的障碍有影响。鉴于其作为社会经济和环境机遇的相关性，我们还询问了与会者对蓝色经济的看法，发现尽管许多人看到了它的潜力，但大多数人不熟悉这个概念，强调需要更广泛的社区意识和讨论其好处。

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引用次数: 0

Beyond the surface – Microplastic hotspots in the water column of a top plastic-polluted deep lake 表面之外——一个顶级塑料污染的深湖水柱中的微塑料热点

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2026-02-01 DOI: 10.1016/j.jglr.2025.102740

Federica Rotta , Camilla Capelli , Agnese Marchini , Barbara Leoni , Giusto Lo Bue , Maya Musa , Maria Pia Riccardi , Fabio Lepori

Most research on microplastics in lakes has focused on particles floating on the surface, while little is known about microplastic occurrence in subsurface layers, even though these layers comprise most of the lake’s volume. This knowledge gap is concerning because, without a deeper understanding of microplastic vertical occurrence, the full impact of microplastics on lake ecosystems cannot be accurately assessed. To fill this gap, this study investigated the seasonal variation in the concentration and composition (size, shape, and polymer type) of microplastics in different layers of the water column in Lake Lugano (Switzerland and Italy), a deep southern perialpine lake known for high microplastic pollution on the surface. Microplastic samples were collected seasonally from the water column, specifically from four layers representative of the surface (0–0.2 m), subsurface (0–10 m), middle (10–20 m), and bottom (20–80 m) layers of the lake. The highest microplastic concentrations were found in the upper three layers (surface: 18.9 particles m⁻³; subsurface: 29.2 particles m⁻³; middle: 30.9 particles m⁻³), whereas the lowest concentrations were found in the bottom layer (4.3 particles m⁻³). In addition, the layers showed differences in microplastic composition (size and shape) and intra-annual variation, suggesting that the interplay between seasonal environmental changes and hydrodynamic conditions may be a key driver of plastic distribution in deep lakes. The observed high concentration of microplastics between 0 m and 20 m depth, which encompass the euphotic zone, suggests a high risk of interactions between microplastics and freshwater organisms, warranting further investigation.

大多数关于湖泊微塑料的研究都集中在漂浮在表面的颗粒上，而对亚表层中微塑料的存在知之甚少，尽管这些层构成了湖泊的大部分体积。这种知识差距令人担忧，因为如果没有对微塑料垂直分布的更深入了解，就无法准确评估微塑料对湖泊生态系统的全面影响。为了填补这一空白，本研究调查了卢加诺湖（瑞士和意大利）水柱不同层中微塑料浓度和组成（大小、形状和聚合物类型）的季节性变化。卢加诺湖是一个南部深高山湖泊，以表面微塑料污染严重而闻名。微塑料样品是按季节从水柱中收集的，具体来说，从湖的表层（0-0.2 m）、地下（0-10 m）、中层（10-20 m）和底层（20-80 m）四个层收集。微塑料浓度最高的是上层三层（表层：18.9个颗粒m−3，下层：29.2个颗粒m−3，中层：30.9个颗粒m−3），最低的是底层（4.3个颗粒m−3）。此外，各层微塑料组成（大小和形状）和年内变化也存在差异，表明季节环境变化和水动力条件之间的相互作用可能是深湖塑料分布的关键驱动因素。在0米至20米深度范围内观察到的高浓度微塑料，包括光区，表明微塑料与淡水生物之间相互作用的风险很高，需要进一步调查。

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引用次数: 0