Journal of Great Lakes Research最新文献_第10页

Prevalence and potential for biological effects of several chemicals of interest in Lake Superior tributaries 苏必利尔湖支流几种重要化学物质的流行及其潜在生物效应

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-06-12 DOI: 10.1016/j.jglr.2025.102608

Sophia LaFond-Hudson , Matthew A. Pronschinske , Sarah M. Elliott , Steven R. Corsi

Lake Superior is typically assumed to have excellent water quality, but its tributaries have been understudied for contaminants relative to other Great Lakes. This study monitored polycyclic aromatic hydrocarbons (PAHs), alkylphenols (AP) and alkylphenol ethoxylates (APEs), bisphenols, and neonicotinoid pesticides in 18 sites on 17 United States tributaries to Lake Superior in 2022. Contaminants were analyzed from 54 surface water and 17 stream bed sediment samples. PAHs were the most prevalent contaminant class. Among 17 PAHs in 17 samples (289 instances), 71 % were positive detections. Surface water samples were not analyzed for PAHs. Next, among 4 APs and APEs analyzed, 35 % of sediment sample instances and 21 % of instances in 54 water samples were positive detections. Bisphenol analogues were detected in 2 % of sediment sample instances and 4 % of water sample instances. Bisphenol A (BPA) was not quantified due to field blank contamination, but bisphenol AF (BPAF), bisphenol E (BPE), bisphenol F (BPF), and bisphenol S (BPS) were detected in environmental samples. Neonicotinoids were detected in 0.5 % of sediment sample instances and 0.4% of water samples instances. Low detection frequencies for contaminants precluded analyses with watershed land use characteristics, but four sites (Tischer Creek, Miller Creek, Carp River and Iron River) emerged as locations with relatively elevated contaminant concentrations. Comparison of concentrations with ToxCast and other water quality guidelines suggested potential for biological effects from some samples. This study provides a baseline of low contaminant prevalence in Lake Superior tributaries while identifying a few locations that may warrant further monitoring.

苏必利尔湖通常被认为具有优良的水质，但相对于其他大湖，对其支流的污染物研究不足。该研究监测了2022年美国苏必利尔湖17条支流18个地点的多环芳烃（PAHs）、烷基酚（AP）和烷基酚聚氧基醚（ape）、双酚类和新烟碱类农药。对54份地表水和17份河床沉积物样本进行了污染物分析。多环芳烃是最普遍的污染物类别。17份样品（289例）中17种多环芳烃的检出阳性率为71%。地表水样品没有分析多环芳烃。接下来，在分析的4个ap和ape中，35%的沉积物样品和54个水样中21%的样品检测呈阳性。在2%的沉积物样品和4%的水样中检测到双酚类似物。由于现场空白污染，未对双酚A （BPA）进行定量，但对环境样品中的双酚AF （BPAF）、双酚E （BPE）、双酚F （BPF）和双酚S （BPS）进行了检测。在0.5%的沉积物样品和0.4%的水样中检测到新烟碱类。污染物的低检测频率妨碍了对流域土地利用特征的分析，但四个地点（蒂舍河、米勒河、鲤鱼河和铁河）出现了相对较高的污染物浓度。与ToxCast和其他水质准则的浓度比较表明，某些样品可能产生生物效应。这项研究提供了苏必利尔湖支流低污染物流行率的基线，同时确定了几个可能需要进一步监测的地点。

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引用次数: 0

Patterns of geospatial data and imagery use within coastal communities along the Great Lakes of the United States 地理空间数据和图像在美国五大湖沿岸社区的使用模式

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2024-09-07 DOI: 10.1016/j.jglr.2024.102418

Erin L. Bunting, Lucas Rabins, Ethan J. Theuerkauf , Elizabeth A. Mack

With expanding technological resources, there has been an increase in both the quantity and quality of coastal data available to researchers and the public. Such quality data, including orthomosaics, digital elevation models, and coastal profiles, are critical to effective coastal management, yet collecting, processing, and analyzing such data represents a barrier for resource-limited communities. Across global landscapes, especially coastal environments, citizen science drone monitoring programs have shown to expand data access. However, differences in understanding may impact capacity for data integration into decision making. This study investigates how capacity to understand and incorporate data into local management practices differs between communities through a survey of decision makers across several Great Lakes communities. The Great Lakes face myriad environmental challenges that threaten the ecological and economic health of the system. Among these are fluctuating lake levels that drive physical changes to the coastline and impact the coupled natural-human system through increased erosion, loss of vegetation, property destruction, and disruption of tourist activities. Exploring the interest and understanding of data use is important given that the Great Lakes account for 20% of the world’s freshwater, over 5,000 miles of U.S. coastline, and have over 52 million people living within the region. Overall, this study found there is an overwhelming agreement among communities’ decision makers that data are important and represent an improvement over current options. However, there were differing patterns of data comprehension when comparing communities. While there was agreement that these data have potential for integration into coastal management if available, in the future it will be important to discern not just the data comprehension and interest but understanding of the preprocessing involved to obtain such data products.

随着技术资源的扩大，研究人员和公众可获得的沿海数据的数量和质量都有所提高。这些高质量的数据，包括正形图、数字高程模型和海岸剖面图，对有效的海岸管理至关重要，然而收集、处理和分析这些数据对资源有限的社区来说是一个障碍。在全球范围内，特别是沿海环境，公民科学无人机监测项目已经显示出扩大数据访问的能力。然而，理解上的差异可能会影响数据整合到决策中的能力。本研究通过对几个五大湖社区的决策者的调查，调查了不同社区之间理解和将数据纳入当地管理实践的能力的差异。五大湖面临着无数的环境挑战，威胁着该系统的生态和经济健康。其中包括波动的湖泊水位，它驱动着海岸线的物理变化，并通过增加侵蚀、植被损失、财产破坏和旅游活动中断来影响耦合的自然-人类系统。探索对数据使用的兴趣和理解是很重要的，因为五大湖占世界淡水的20%，超过5000英里的美国海岸线，超过5200万人生活在该地区。总的来说，这项研究发现，在社区决策者中有压倒性的共识，即数据很重要，代表着对当前选择的改进。然而，在比较社区时，存在不同的数据理解模式。虽然大家一致认为，如果有这些数据，这些数据有可能纳入沿海管理，但在未来，重要的是不仅要了解数据的理解和兴趣，而且要了解为获得这些数据产品所涉及的预处理。

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引用次数: 0

Microcystin persistence in Lake Erie foreshore sands 伊利湖滨沙中微囊藻毒素的持久性

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-05-14 DOI: 10.1016/j.jglr.2025.102601

Garrett B. Moots, Daryl L. Moorhead, Chelsey E. Suffety, Kayla M. Kinzel, Daryl F. Dwyer, Von Sigler

Research into the persistence of microcystin (MC) in foreshore sands is limited. Lake water and foreshore sand samples were collected weekly from three swim coves at Maumee Bay Park Beach (OH) during the recreational swim season to assess the accumulation and persistence of MC in foreshore sands. Enzyme-linked-immunosorbent-assay (ELISA) analysis showed that 14 % of lake water samples exceeded the EPA no-contact threshold for MC in recreational waters (8 µg/L), with a maximum concentration of 17 µg/L occurring during a bloom event. Average MC concentrations in surface foreshore sands (4 µg/L porewater) were significantly higher, on average, than in deeper sands (2 µg/L porewater), while peak sand MC concentrations exceeded 29 µg/L during two bloom events. Overall, MC concentrations in both shallow and deep sand exceeded water MC concentrations in 56 % of samples, indicating accumulation of MC in foreshore sands. MC persistence was determined in laboratory microcosms containing either autoclaved or non-autoclaved sands augmented with MC. ELISA analysis showed a 46 % reduction in MC concentration in autoclaved sands over 7 weeks. In non-autoclaved sands, the MC concentration decreased by 100 % during the study, with approximately 99 % of the added MC degrading during days 21–28, suggesting that a biological mechanism drove degradation. Our findings reveal that beach sands can act as MC reservoirs, accumulating and concentrating MC during and following bloom events.

关于微囊藻毒素（MC）在前滨砂中的持久性研究有限。在休闲游泳季节，每周从莫米湾公园海滩（OH）的三个游泳海湾收集湖水和前滨沙样本，以评估MC在前滨沙中的积累和持久性。酶联免疫吸附法（ELISA）分析显示，14%的湖水样品超过了EPA在休闲水域的无接触阈值（8微克/升），在水华事件期间最高浓度为17微克/升。表层前滩砂（4µg/L孔隙水）的平均MC浓度显著高于深层砂（2µg/L孔隙水），而在两次水华事件中，峰值砂MC浓度超过29µg/L。总体而言，在56%的样品中，浅层和深层沙子中的MC浓度都超过了水中的MC浓度，表明MC在前滩沙子中积累。在实验室的微环境中，测定了MC的持久性，包括高压灭菌或非高压灭菌的含有MC的砂。ELISA分析显示，在7周内，高压灭菌砂中的MC浓度降低了46%。在非高压灭菌砂中，MC浓度在研究期间下降了100%，大约99%的添加MC在21-28天降解，这表明生物机制驱动了降解。我们的研究结果表明，在水华期间和之后，海滩砂可以作为MC储集层，聚集和集中MC。

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引用次数: 0

Corrigendum to “Quantifying phosphorus loads from legacy-phosphorus fields” [J. Gt. Lakes 50 (2024) 102446] “从遗留磷田定量磷负荷”的勘误[J]。Gt. Lakes 50 (2024) 102446]

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-01-10 DOI: 10.1016/j.jglr.2024.102498

Michael R. Brooker , Jessica D’Ambrosio , Margaret Kalcic , Kevin W. King , Greg LaBarge , Brian Roe , Nathan D. Stoltzfus , Sam Sage , Rachelle Crow , Robyn S. Wilson , Ryan J. Winston , Jay F. Martin

引用次数: 0

Recovery of urban Great Lakes beaches after lake-level rise: The roles of infrastructure, sand supply, and management activities 湖面上升后五大湖城市海滩的恢复：基础设施、沙源和管理活动的作用

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-05-22 DOI: 10.1016/j.jglr.2025.102603

C.R. Mattheus

Managing beaches along urban waterfront corridors of the North American Great Lakes is challenging, as already complex lacustrine hydro-, littoral sand-supply, and coastal morphodynamics are impacted by shoreline and offshore infrastructure in ways not yet fully understood. This paper addresses the legacy controls of geomorphic developments and changes in sand volume within lakefront embayments, during high decadal base water-level conditions, on subsequent beach-recovery dynamics, during lake-level fall. Showcased are insights from annual topobathymetric assessments from 2021 through 2024, over which time Lake Michigan’s base water level fell by ∼ 1 m from its 2020 highstand. Data from ongoing geological monitoring activities were supplemented with federal datasets, which provided information on 2012–2020 sand volumetric changes across urban lakefront embayments with ∼ 1.5 m of lake-level rise. Beach geomorphic developments with 2020–2024 interannual lake-level fall are shown to have been influenced by the legacy of preceding morphodynamic and sand-sequestration patterns. Unlike the shared lake-level and storm histories, these parameters are beach-specific. While all Chicago beach shorelines retreated and experienced overwash into backshore regions during lake-level rise, shoreline advance and foredune re-establishment with lake-level fall have been influenced by preceding sand volumetric changes. This has implications for coastal managers, who must develop site-specific mitigation plans that take intrinsic controls of lakefront structures and time-varying sand-transport patterns on beach morphodynamics into account. The re-establishment of ecologically important foredune areas within urban beaches is of particular interest, given that the urban lakefront of Chicago has recently hosted nesting pairs of the endangered Great Lakes piping plover.

管理北美五大湖城市滨水走廊的海滩是一项挑战，因为已经复杂的湖泊水力、沿海沙源和海岸形态动力学受到海岸线和海上基础设施的影响，其影响方式尚未完全了解。本文讨论了在高年代际基础水位条件下，湖滨河口地貌发展和沙量变化的遗留控制因素，以及在湖泊水位下降期间随后的海滩恢复动力学。展示了从2021年到2024年的年度地形深度评估的见解，在此期间，密歇根湖的基础水位从2020年的高点下降了约1米。正在进行的地质监测活动的数据补充了联邦数据集，这些数据集提供了2012-2020年湖泊水位上升~ 1.5 m时城市湖滨河口沙粒体积变化的信息。研究表明，2020-2024年湖泊水位年际下降的海滩地貌发展受到先前形态动力学和沙封存模式的影响。与共享的湖泊水位和风暴历史不同，这些参数是特定于海滩的。虽然所有的芝加哥海滩岸线在湖平面上升期间都后退并经历过冲过，但随着湖平面下降，岸线的推进和前丘的重建都受到先前沙粒体积变化的影响。这对沿海管理人员有影响，他们必须制定特定地点的缓解计划，将湖滨结构的内在控制和海滩形态动力学上随时间变化的沙尘输送模式考虑在内。在城市海滩内重建具有重要生态意义的前沙丘区域是特别值得关注的，因为芝加哥的城市湖滨最近迎来了濒临灭绝的五大湖管鸻成对筑巢。

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引用次数: 0

Silent invaders of freshwater ecosystems: Unveiling the microplastic crisis threatening the world’s largest soda lake (Lake Van, Türkiye) 淡水生态系统的无声入侵者：揭示威胁世界上最大的苏打湖（lake Van, trkiye）的微塑料危机

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-05-21 DOI: 10.1016/j.jglr.2025.102604

Münevver Oral Kaba , Mert Minaz , Cüneyt Kaya , Thibaut Jouy , Irmak Kurtul , Ülgen Aytan

This study aims to assess the status of microplastic (MP) pollution in Lake Van (Türkiye), a vital freshwater ecosystem with a unique ecological significance. The objectives were to determine MP abundance, size distribution, type and polymer composition, and potential ecological risks to fish species. Comprehensive sampling was conducted at eight stations for water, while three of these stations specifically focused on the gastrointestinal tracts of fish. The findings indicate a high prevalence of MPs, particularly in areas with significant human activity, such as station 1 at Sapur (mean ± SD 69.08 ± 22.3 MP/m³) and station 6 at Gevaş (72.41 ± 26.9 MP/m³). Fibers were dominant in both water and fish samples, with polyethylene terephthalate (PET) and polyacrylonitrile (PAN) being the most commonly identified polymers. This study highlights the occurrence of MPs in endemic and/or economically important fish species such as tarek (Alburnus tarichi) (mean 1.50–2.25 MP/indiv.), Van loach (Oxynoemacheilus ercisianus) (mean 0.55 MP/indiv.), lizard barbel (Barbus lacerta) (mean 0.57 MP/indiv.), and Levantine scraper (Capoeta damascina) (mean 1.00–1.75 MP/indiv.). These findings highlight the potential ecological risks posed by MP contamination for ecosystem, fish, and human health, and the urgent need for targeted mitigation strategies to reduce MP pollution. The study provides critical baseline data for understanding MP dynamics in Lake Van and contributes to the broader understanding of freshwater MP contamination on a global scale.

摘要本研究旨在评估凡湖（t rkiye）的微塑料污染状况，凡湖是一个重要的淡水生态系统，具有独特的生态意义。目的是确定MP丰度、大小分布、类型和聚合物组成以及对鱼类的潜在生态风险。在8个站点对水进行了全面采样，其中3个站点专门关注鱼类的胃肠道。结果表明，MPs的患病率很高，特别是在人类活动显著的地区，如萨布尔的1号站（平均±SD 69.08±22.3 MP/m3）和格瓦库的6号站（72.41±26.9 MP/m3）。纤维在水和鱼样品中都占主导地位，聚对苯二甲酸乙二醇酯（PET）和聚丙烯腈（PAN）是最常见的聚合物。本研究强调了MPs在一些特有和/或经济上重要的鱼类中的发生率，如大鳞鱼（Alburnus tarichi）（平均1.50-2.25 MP/个体）、凡泥鳅（Oxynoemacheilus ercisianus）（平均0.55 MP/个体）、刺蜥（Barbus lacerta）（平均0.57 MP/个体）和地中海刮刀（Capoeta damascina）（平均1.00-1.75 MP/个体）。这些发现强调了多聚污染物对生态系统、鱼类和人类健康构成的潜在生态风险，以及迫切需要有针对性的缓解策略来减少多聚污染物。该研究为了解Van湖的MP动态提供了关键的基线数据，并有助于在全球范围内更广泛地了解淡水MP污染。

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引用次数: 0

Beach nourishment response and recent morphological evolution of Minnesota Point, Lake Superior 苏必利尔湖明尼苏达角的海滩营养反应及近期形态演变

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2024-11-09 DOI: 10.1016/j.jglr.2024.102459

C.J. Roland , J.T. Groten , J.W. Lund , J.L. Hanson

Beach nourishments are a popular nature-based alternative to armoring for shoreline erosion mitigation, but nourishments have been criticized due to their environmental impacts and uncertain sustainability. Monitoring is often nonexistent or insufficient to constrain nourishment longevity and inform the renourishment interval required to maintain shoreline protection. This study uses a combination of topobathymetric surveys, high-resolution satellite-derived shorelines, and coastal engineering analyses to investigate the recent evolution of Minnesota Point and the fate of three beach nourishments constructed adjacent to littoral barriers. We use semi-empirical formulations for sediment compatibility, wave runup, and longshore sediment transport to inform the observed nourishment behavior. Minnesota Point experienced widespread foredune retreat averaging 7±2.8 m from 2009–2019 and 130,000 (70,000–140,000) m³ of sediment was eroded during this interval. The 2019 nourishment at the Superior Entry was rapidly eroded by strong storms, losing

> 80 %

of the added beach width by the following spring. The 2020 and 2021 nourishments at the Duluth Entry retained

> 80 %

of the nourishment material at the time of the last topobathymetric survey in the fall of 2022, and satellite-derived shorelines indicate that the beach remained 10 m wider than pre-nourishment conditions at the end of 2023. Modeled longshore transport rates over the period 2009–2022 averaged 11,400 m³ yr⁻¹ northwestward at the Superior Entry, nearly 3x greater than the 4000 m³ yr⁻¹ southeastward transport modeled at the Duluth Entry. These observations show that differences in shoreline orientation, littoral sediment supply, and grain size compatibility can lead to contrasting beach nourishment longevities, and this study provides additional measurements of Minnesota Point’s long-term morphological change which can help inform coastal resiliency efforts.

海滩营养物是一种受欢迎的基于自然的替代方案，可用于减轻海岸线侵蚀，但营养物因其对环境的影响和不确定的可持续性而受到批评。监测往往不存在或不足以限制营养的寿命，并告知维持海岸线保护所需的补充时间间隔。本研究结合了地形测深测量、高分辨率卫星岸线和海岸工程分析，调查了明尼苏达角的近期演变，以及在沿海屏障附近建造的三个海滩营养物的命运。我们使用泥沙相容性的半经验公式，波浪上升，和海岸泥沙运输来告知观察到的营养行为。从2009年到2019年，明尼苏达角经历了广泛的前沙丘退缩，平均为7±2.8米，在此期间侵蚀了13万（7万- 14万）立方米的沉积物。2019年，强风暴迅速侵蚀了苏必利尔入口的营养，到第二年春天，增加的海滩宽度损失了80%。在2022年秋季最后一次地形测量时，德卢斯入口的2020年和2021年营养品保留了80%的营养品物质，卫星岸线显示，到2023年底，海滩仍比营养前条件宽10米。模拟的2009-2022年期间，Superior入口向西北方向的海岸运输速率平均为11,400 m3 /年，比德卢斯入口模拟的东南方向的4,000 m3 /年大近3倍。这些观察结果表明，海岸线方向、沿海沉积物供应和粒度兼容性的差异会导致海滩营养寿命的差异，这项研究提供了明尼苏达角长期形态变化的额外测量，这有助于为海岸恢复工作提供信息。

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引用次数: 0

Diet-induced declines in thiamine concentration threaten the cardiac health of wild sub-adult Chinook salmon 饮食引起的硫胺素浓度下降威胁着野生亚成年奇努克鲑鱼的心脏健康

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-04-30 DOI: 10.1016/j.jglr.2025.102586

K.A. Adeli , E.E. Singh , J. Rinchard , B.D. Neff

Thiamine (vitamin B₁) is an essential vitamin involved in energy metabolism. Despite its importance, thiamine deficiency is a widespread issue among wildlife. Thiamine deficiency is particularly prevalent among salmonine fishes, in which it is diet-induced and has been associated with detrimental changes to cardiac morphology and function. Here, we assessed the diet, thiamine concentration, and ventricular morphology of sub-adult Chinook salmon (Oncorhynchus tshawytscha) in lakes Huron and Ontario. Stomach content analyses revealed distinct dietary differences between lakes. Chinook salmon from Lake Huron, which primarily consumed rainbow smelt (Osmerus mordax), had significantly higher skeletal muscle and ventricle thiamine concentrations compared to those from Lake Ontario, where their diet mainly consisted of alewife (Alosa pseudoharengus). Histological analyses of cardiac ventricles revealed that low ventricle thiamine concentrations were associated with detrimental changes to ventricular morphology including cardiomyocyte hypertrophy, degeneration, fibrosis, and changes in compact myocardium thickness. Altogether, this work demonstrates that low thiamine concentrations could threaten the cardiac health of wild salmonines, with important implications for their conservation and management.

硫胺素（维生素B1）是一种参与能量代谢的必需维生素。尽管它很重要，但硫胺素缺乏症在野生动物中是一个普遍的问题。硫胺素缺乏症在鲑科鱼类中尤为普遍，这是由饮食引起的，并与心脏形态和功能的有害变化有关。在这里，我们评估了休伦湖和安大略省的亚成年奇努克鲑鱼（Oncorhynchus tshawytscha）的饮食、硫胺素浓度和心室形态。胃内容物分析揭示了不同湖泊之间的饮食差异。来自休伦湖的奇努克鲑鱼主要食用彩虹香（Osmerus mordax），与来自安大略湖的鲑鱼相比，它们的骨骼肌和心室硫胺素浓度明显更高，安大略湖的鲑鱼的饮食主要由alewife （Alosa pseudoharengus）组成。心室的组织学分析显示，低心室硫胺素浓度与心室形态学的有害改变有关，包括心肌细胞肥大、变性、纤维化和致密心肌厚度的改变。总之，这项工作表明，低硫胺素浓度可能威胁野生鲑鱼的心脏健康，对它们的保护和管理具有重要意义。

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引用次数: 0

Dynamic coasts, resilient futures: Navigating changes in the Great Lakes – Foreword to the special section 动态海岸，弹性的未来：在五大湖导航变化-前言特别部分

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-07-08 DOI: 10.1016/j.jglr.2025.102618

Lorelle A. Meadows , Ethan Theuerkauf , Cary Troy , Pengfei Xue , Guy Meadows , Chin Wu

Historically, research on coastal processes has largely been concentrated on oceanic environments which have much in common with the Great Lakes but also differ in significant ways. This is particularly true with respect to substantial and lasting water level fluctuations that occur on seasonal and decadal time scales that differ temporally from shorter term tidal fluctuations and greatly exceed long-term oceanic sea level rise. Since the late 1990s, the Great Lakes basin has experienced record-breaking high and low water levels as well as more frequent and intense storms. This combination of factors has led to changes to these nearshore environments and stimulated new and exciting coastal research characterizing and quantifying these changes and offering new insights into Great Lakes coastal processes. Studies in this special section address these unique coastal landscapes shaped by both natural forces (e.g., ice dynamics, waves, and fluctuating lake levels) and human influences (armoring, coastal structures, sediment nourishment, and policy interventions). The findings shared in this collection provide actionable knowledge for anticipating change, mitigating risk, and building long-term resilience while calling for adaptive management frameworks to foster proactive, equitable stewardship of the Great Lakes shorelines.

从历史上看，对沿海过程的研究主要集中在海洋环境上，这些环境与五大湖有许多共同之处，但也有重要的不同之处。在季节性和年代际时间尺度上发生的大幅度和持久的水位波动尤其如此，这种波动在时间上不同于短期潮汐波动，并大大超过长期的海洋海平面上升。自20世纪90年代末以来，五大湖盆地经历了破纪录的高低水位，以及更频繁和更强烈的风暴。这些因素的结合导致了这些近岸环境的变化，并刺激了新的和令人兴奋的沿海研究，这些研究描述和量化了这些变化，并为五大湖的沿海过程提供了新的见解。本专题部分的研究涉及由自然力量（如冰动力、波浪和湖泊水位波动）和人类影响（盔甲、海岸结构、沉积物营养和政策干预）共同塑造的这些独特的沿海景观。本报告中分享的研究结果为预测变化、降低风险和建立长期韧性提供了可操作的知识，同时呼吁建立适应性管理框架，以促进对五大湖海岸线的积极、公平的管理。

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引用次数: 0

Lean lake trout are found in spawning condition during spring-summer in lakes Michigan and Huron 在密西根湖和休伦湖的春夏季，瘦湖鳟鱼处于产卵状态

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-05-13 DOI: 10.1016/j.jglr.2025.102583

Shannon R. Cressman , Sarah A. Mansfield , Fredrick W. Goetz , Heather A. Hackney , Jared J. Homola , Francesco Guzzo , Charles R. Bronte

Here we report the first observations of the capture of lean lake trout (Salvelinus namaycush) in spawning condition in lakes Michigan and Huron during April–July, which is well outside their normal fall spawning season of September–December. Examination of 5731 lake trout landed by anglers at 56 ports in 2022 and 2023 revealed nine female lake trout possessing body cavities filled with mature, loose eggs and two males in ripe condition. Six fish were hatchery-reared and five were of wild origin. Ages of these fish ranged from 6 to 19 years and, of those where strain could be determined, were members of the Seneca Lake and Lewis Lake genetic strains. Loose eggs were similar in appearance to those found in mature fish in fall on spawning grounds. Histological examination of eggs from four females confirmed all were in some stage of ovarian maturity. Two females had ovulated just prior to capture, and the remaining two ovulated much earlier than the capture date. The adaptive advantage of the alternative seasonal spawning is speculative but may include reduced competition with fall spawners, decreased predation risk for juveniles during winter, and access to greater environmental resources in the early spring and summer.

在这里，我们报告了4 - 7月在密歇根湖和休伦湖产卵条件下捕获瘦湖鳟鱼（Salvelinus namaycush）的第一次观察，这远远超出了它们正常的秋季产卵季节9 - 12月。对2022年和2023年在56个港口钓到的5731条湖鳟鱼进行了检查，结果发现，9条雌性湖鳟鱼的体腔里充满了成熟、疏松的卵，2条雄性湖鳟鱼的体腔已经成熟。6条鱼是孵化场饲养的，5条是野生的。这些鱼的年龄从6岁到19岁不等，在那些可以确定菌株的鱼中，是塞内卡湖和刘易斯湖遗传菌株的成员。松散的卵在外观上与秋天在产卵地发现的成熟鱼相似。对4只雌鼠的卵细胞进行组织学检查，证实它们均处于卵巢成熟的某个阶段。两只雌性在捕获前刚刚排卵，其余两只在捕获日期之前排卵。替代性季节性产卵的适应性优势是推测性的，但可能包括减少与秋季产卵者的竞争，降低冬季幼鱼被捕食的风险，以及在早春和夏季获得更多的环境资源。

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