Journal of Great Lakes Research最新文献_第7页

Bacterial community structure across a sand dune chronosequence at the Indiana Dunes National Park 细菌群落结构跨越沙丘时间序列在印第安纳沙丘国家公园

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

Journal of Great Lakes Research

Pub Date : 2025-10-01 DOI: 10.1016/j.jglr.2025.102611

Muruleedhara N. Byappanahalli , Noel B. Pavlovic , Cindy H. Nakatsu

The microbial role in dune succession along the Great Lakes freshwater sand dunes remains poorly understood. A chronosequence study was conducted to understand the relationships among soil bacterial communities, soil chemistry, and prescribed burning at the Indiana Dunes National Park. Soil bacterial communities and chemistry, as well as groundlayer vegetation were sampled during 2015 and 2017 from seven successional stages from the beach (contemporary) to the 14,000-year-old oak forest. Bacterial communities from unburned and burned sites among stages were determined by 16S rRNA gene amplicon sequencing. Soil pH and cations decreased from early (beach, foredune, secondary dune, and woodland transition) to late (oak savanna, woodland, and oak forest) successional stages, while organic matter and organic carbon concentrations increased in the late successional stages. Bacterial alpha diversity showed no significant differences among stages, but a significant interaction was found between stage and prescribed burning (H = 39.7, p < 0.001). Bacterial communities separated mainly along stage by all four beta diversity metrics used (Bray Curtis, Jaccard, and Weighted and Unweighted UniFrac), with the main difference observed along the primary axis (weighted UniFrac, 48 %). Bacterial phyla were differentially abundant in older soil stages compared to beach (ANCOM-BC, q < 0.05); likewise, differential abundances in genera were evident when burned and unburned sites were compared. A Mantel test indicated stronger congruency between the bacterial communities and soil chemistry than between bacterial communities and vegetation. Collectively, soil chemical and microbial parameters along with management practices contribute to dunal successional patterns in the Great Lakes.

微生物在五大湖淡水沙丘沙丘演替中的作用仍然知之甚少。在印第安纳沙丘国家公园进行了一项时间顺序研究，以了解土壤细菌群落、土壤化学和规定燃烧之间的关系。在2015年和2017年期间，从海滩（当代）到14000年历史的橡树林的七个连续阶段，对土壤细菌群落和化学成分以及底层植被进行了采样。通过16S rRNA基因扩增子测序，确定各阶段未烧伤和烧伤部位的细菌群落。土壤pH和阳离子从演替早期（滩地、前丘、次生沙丘和林地过渡）到演替后期（栎树草原、林地和栎林）呈下降趋势，有机质和有机碳浓度在演替后期呈上升趋势。细菌α多样性在不同阶段间无显著差异，但在不同阶段和规定燃烧之间存在显著的相互作用（H = 39.7, p < 0.001）。通过使用的所有四种beta多样性指标（Bray Curtis, Jaccard，加权和未加权UniFrac），细菌群落主要沿着阶段分离，主要沿着主轴（加权UniFrac， 48%）观察到差异。与滩地相比，较老土壤阶段细菌种类丰富（ANCOM-BC, q < 0.05）；同样，当比较燃烧和未燃烧的地点时，一般的差异丰度是明显的。Mantel试验表明，细菌群落与土壤化学的一致性强于细菌群落与植被的一致性。总的来说，土壤化学和微生物参数以及管理措施有助于五大湖的昼夜演替模式。

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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 : 2025-07-08 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

Coastal geomorphic changes near groin structures under fluctuating water levels in Lake Michigan 在密歇根湖波动的水位下，靠近腹股沟结构的海岸地貌变化

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

Journal of Great Lakes Research

Pub Date : 2025-06-27 DOI: 10.1016/j.jglr.2025.102622

Sarah M. Peterson , Chin H. Wu

Coastal geomorphic changes near groins under fluctuating water levels are important for environmental management, hazard mitigation, and socioeconomics. In this study, geomorphic changes of shorelines, beaches, and bluffs were examined within a groin field and two pocket beaches on a high bluff coast in Lake Michigan (at Sheridan Park, Wisconsin), and compared under low, mean, and high lake levels. Distinct geomorphic responses were observed. In the pocket beaches, shorelines were crenulate-shaped and responded fairly linearly with fluctuating lake levels. In comparison, shorelines in the groin field tended to be straight during high lake levels and curved (cusp and saw-toothed) at low lake levels and changed nonlinearly, with abrupt retreat from mean to high lake levels. Beaches were typically wider within the groin field than the pocket beaches when lake levels were low; however, the opposite was found during high water levels, suggesting decreased effectiveness of the groin field at maintaining beach integrity during high water. Increased sediment supply from eroding bluffs likely contributed to wider pocket beaches during high lake levels. Bluff toe retreat was observed in the pocket beaches during high water levels but was not apparent within the groin field. Accelerated bluff recession was observed downdrift of the terminal groin, as has been reported on Lake Michigan and oceanic coasts but not along the regularly nourished pocket beaches of Chicago. Overall, distinct geomorphic changes near groins unique to a high bluff coast under fluctuating water levels were revealed. These insights can help inform coastal management and decision-making in the Great Lakes.

在波动的水位下，靠近腹股沟的沿海地貌变化对环境管理、减灾和社会经济学具有重要意义。在这项研究中，在密歇根湖（威斯康星州谢里丹公园）的一个高崖海岸的一个腹沟场和两个口袋海滩内，研究了海岸线、海滩和悬崖的地貌变化，并比较了低、平均和高湖平面下的地貌变化。观察到明显的地貌响应。在口袋海滩，海岸线呈新月形，与湖泊水位波动呈线性关系。相比之下，在高水位时，腹股沟地岸线呈直线状，低水位时呈曲线状（尖状和锯齿状），且呈非线性变化，从平均水位向高水位突然退缩。当水位较低时，腹股沟内的海滩通常比口袋海滩更宽；然而，在高水位期间发现的情况正好相反，这表明在高水位期间腹股沟场维持海滩完整性的有效性降低。在湖高水位期间，侵蚀悬崖增加的沉积物供应可能导致更宽的口袋海滩。在高水位时，在口袋滩观察到钝趾退缩，但在腹股沟区不明显。在末端腹股沟处观察到加速的悬崖衰退，正如在密歇根湖和海洋海岸所报道的那样，但在芝加哥定期滋养的口袋海滩上却没有。总体而言，在波动的水位下，揭示了高崖海岸独有的腹股沟附近独特的地貌变化。这些见解有助于为五大湖的沿海管理和决策提供信息。

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引用次数: 0

Distribution of American eels (Anguilla rostrata) and the influence of barriers in the Lake Champlain basin 尚普兰湖流域美洲鳗鲡的分布及屏障的影响

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

Journal of Great Lakes Research

Pub Date : 2025-06-21 DOI: 10.1016/j.jglr.2025.102617

Rose E. Stuart, Hannah L. Holst, J. Ellen Marsden, Jason D. Stockwell

Freshwater eels (Anguilla spp.) are experiencing significant population declines, particularly for species from temperate latitudes. These declines are attributed to overharvest, habitat degradation, and migration barriers such as dams. However, lack of information about eel distribution, habitat use, and ability to navigate in-stream barriers increases the challenge of managing eels. We investigated the distribution and abundance of eels in the Lake Champlain basin, where 2.7 million glass eels were stocked from 2005 to 2010, and focused on the influence of barriers pre- and post-stocking. Data were collated from a range of sources, from 1929 to 2024. Eels were recorded throughout Lake Champlain and its tributaries, including down to 90-m depth in the lake and distances up to 40 km upstream from the lake. Eels were rarely observed upstream of dams >10 m, and observations were reduced upstream of multiple dams, regardless of dam height. Stocked eels may be expanding the overall distribution of eels in the basin, with post-stocking observations from locations typically considered ‘impassable’. Inconsistency in data collection over space and time has left gaps in our understanding of eel distributions and creates uncertainty regarding accuracy of observed eel absences, issues which could be improved by future survey work. Our findings from the Lake Champlain basin can likely be extrapolated to the larger St Lawrence River basin, where stocking has also occurred, to identify research and management needs regarding the impacts of small dams in minor tributaries and large dams in major rivers.

淡水鳗（安圭拉鳗属）的数量正在显著下降，尤其是温带地区的物种。这些下降是由于过度捕捞、栖息地退化和大坝等迁徙障碍造成的。然而，缺乏关于鳗鱼分布、栖息地利用和穿越河内屏障的能力的信息增加了管理鳗鱼的挑战。2005 - 2010年，尚普兰湖流域共放养了270万条玻璃鳗，调查了玻璃鳗的分布和丰度，重点分析了放养前后屏障对玻璃鳗的影响。数据整理自1929年至2024年的一系列来源。整个尚普兰湖及其支流都有鳗鱼的记录，包括90米深的湖泊和上游40公里的距离。在大坝上游10 m处很少观察到鳗鱼，而在多个大坝上游，无论大坝高度如何，观察到的鳗鱼都减少了。放养的鳗鱼可能扩大了该盆地中鳗鱼的总体分布，放养后从通常被认为“无法通过”的地点进行观察。数据收集在空间和时间上的不一致性给我们对鳗鱼分布的理解留下了空白，并对观察到的鳗鱼缺失的准确性造成了不确定性，这些问题可以通过未来的调查工作得到改善。我们在尚普兰湖流域的研究结果很可能可以外推到更大的圣劳伦斯河流域，在那里也发生了放养，以确定关于小支流小水坝和主要河流大水坝影响的研究和管理需求。

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引用次数: 0

Investing in Great Lakes Science is critical for safety and prosperity 投资五大湖科学对安全与繁荣至关重要

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

Journal of Great Lakes Research

Pub Date : 2025-06-19 DOI: 10.1016/j.jglr.2025.102614

Gregory J. Dick , Mike Shriberg , Mary Ogdahl , Karen M. Alofs , Bopaiah A. Biddanda , Hunter Carrick , Patrick J. Doran , Aaron T. Fisk , Stuart E. Jones , Rebecca Klaper , Dennis McCauley , Ashley Moerke , Rebecca Meuninck , Catherine M. O’Reilly , Jonathan T. Overpeck , Mantha S. Phanikumar , Lars G. Rudstam

Scientific research plays a crucial role in supporting the safety and prosperity of tens of millions of people who live, work, and recreate in the Laurentian Great Lakes. Cuts to US federal funding, programs, and agencies threaten this research enterprise. As scientists and collaborators at the Cooperative Institute for Great Lakes Research, we make the case for the value of Great Lakes research in terms of human health and safety, economic prosperity, and society’s capacity to confront major challenges today and in the future. The successful track record of scientific research in the Great Lakes shows that it provides return on investment by protecting and restoring the ecosystem, supporting human well-being, and stimulating a thriving economy. Without this continued investment, the future of the Great Lakes and those depending on them is in peril.

科学研究在保障数千万在劳伦森五大湖生活、工作和娱乐的人们的安全和繁荣方面发挥着至关重要的作用。美国联邦基金、项目和机构的削减威胁着这项研究事业。作为五大湖合作研究所的科学家和合作者，我们在人类健康和安全、经济繁荣以及社会应对当今和未来重大挑战的能力方面，为五大湖研究的价值提出了理由。五大湖科学研究的成功记录表明，它通过保护和恢复生态系统、支持人类福祉和刺激蓬勃发展的经济，提供了投资回报。如果没有这种持续的投资，五大湖和依赖它们的国家的未来将处于危险之中。

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引用次数: 0

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 : 2025-06-12 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

Stable isotope analysis of western Lake Superior predatory fishes, part two: prey source contributions 苏必利尔湖西部掠食性鱼类的稳定同位素分析，第二部分：猎物来源贡献

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

Journal of Great Lakes Research

Pub Date : 2025-06-12 DOI: 10.1016/j.jglr.2025.102615

Jessica Hanson , Morgann Gordon , Nick Peterson , Ryan Lepak , Cory Goldsworthy , Valerie Brady , Thomas Hrabik , Joel Hoffman

Niche partitioning of time, space, or resources facilitates the coexistence of competitor species. The Lake Superior food web includes several piscivores that are important to fisheries, including native lake trout (Salvelinus namaycush, both lean and siscowet morphotypes) and walleye (Sander vitreus), and introduced Chinook salmon (Oncorhynchus tshawytscha), coho salmon (Oncorhynchus kisutch), pink salmon (Oncorhynchus gorbuscha), brown trout (Salmo trutta), and rainbow trout (Oncorhynchus mykiss). Here we quantify specific prey source contributions to these predators in the western arm of Lake Superior using dual stable isotope mixing models based on carbon and nitrogen stable isotope ratios. For each species, three mixing models were constructed to examine predator size effect: one with all fish sampled, one with the 10 smallest fish sampled, and one with the 10 largest fish sampled. We found that native and introduced species had distinct diets from one another; siscowet lake trout primarily relied on burbot (Lota lota) and invasive rainbow smelt (Osmerus mordax), native lean lake trout and walleye both relied on invasive rainbow smelt, and introduced salmonids relied on native invertebrates Mysis diluviana and Diporeia spp. Additionally, siscowet lake trout, lean lake trout, Chinook salmon, and coho salmon exhibited size-based shifts in prey contributions. The low piscivory in introduced salmonids and high reliance of native predators on invasive rainbow smelt is likely due to low abundance of cisco (Coregonus artedi). Our study reveals complex, potentially adaptive responses of both native and introduced nearshore predators to both native and invasive prey resources in Lake Superior.

时间、空间或资源的生态位划分有利于竞争物种的共存。苏必必尔湖食物网包括几种对渔业很重要的鱼食动物，包括本地湖鳟鱼（Salvelinus namaycush，瘦型和siscowet型）和白眼鱼（Sander vitreus），以及引进的奇努克鲑鱼（Oncorhynchus tshawytscha）、银鲑（Oncorhynchus kisutch）、粉红鲑鱼（Oncorhynchus gorbuscha）、褐鳟（Salmo trutta）和虹鳟（Oncorhynchus mykiss）。本文采用基于碳和氮稳定同位素比值的双稳定同位素混合模型，量化了苏必利尔湖西岸特定猎物源对这些捕食者的贡献。对于每个物种，构建了三个混合模型来检验捕食者大小效应：一个是所有鱼的样本，一个是10条最小的鱼的样本，一个是10条最大的鱼的样本。我们发现本地物种和引进物种有不同的饮食；虹鳟主要依赖白鲑（Lota Lota）和入侵虹鲑（Osmerus mordax），本地瘦湖鳟鱼和白眼鱼都依赖入侵虹鲑，引进鲑鱼依赖本地无脊椎动物diluviana和Diporeia spp.此外，虹鳟、瘦湖鳟鱼、奇努克鲑鱼和coho鲑鱼在猎物贡献上表现出基于尺寸的变化。引进鲑科鱼类的低鱼类摄取量和本地捕食者对入侵彩虹鲑的高度依赖可能是由于cisco （Coregonus artedi）丰度低。我们的研究揭示了苏必利尔湖本地和引进的近岸捕食者对本地和入侵猎物资源的复杂的、潜在的适应性反应。

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引用次数: 0

Insight into successful research impacts: An environmental scan of academic and non-governmental institutes focused on the Laurentian Great Lakes ecosystem 对成功研究影响的洞察：关注劳伦森五大湖生态系统的学术和非政府机构的环境扫描

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

Journal of Great Lakes Research

Pub Date : 2025-06-06 DOI: 10.1016/j.jglr.2025.102612

Michael R. Twiss

Protection of water quality and ecosystem health of the Great Lakes is strongly supported by people living in their watershed. Greater scientific understanding of the Great Lakes ecosystem is recognised as a key need for designing and conducting research that will provide the best means to protect the ecosystem and evaluate environmental restoration actions. Water research centres that focus on the Great Lakes aquatic ecosystem are important features of research infrastructure in the region and provide service to environmental governance, outreach, and education. An environmental scan was conducted on 22 academic and non-governmental water research centres to understand the types of institutional governance and scope of activity that leads to successful centres. All water centres are viewed favourably at their respective institutions and in their communities and serve important science communication roles with the public. Public outreach is an important function of water centres in the Great Lakes region, and greater efforts are required for fully inclusive and participatory involvement with stakeholders and rights holders. This study will be useful for any organisation seeking to develop a new or revise an existing water centre in the Great Lakes region to serve the growing need to protect water quality and ecosystem integrity.

五大湖流域居民大力支持对水质和生态系统健康的保护。人们认为，对五大湖生态系统进行更深入的科学了解是设计和开展研究的关键需求，这将为保护生态系统和评估环境恢复行动提供最佳手段。关注五大湖水生生态系统的水研究中心是该地区研究基础设施的重要特征，并为环境治理、外联和教育提供服务。对22个学术和非政府水研究中心进行了环境扫描，以了解导致中心成功的机构管理类型和活动范围。所有的水中心在各自的机构和社区中都受到好评，并在与公众的科学交流中发挥着重要的作用。公众外联是大湖地区水中心的一项重要职能，需要作出更大的努力，使利益攸关方和权利持有人充分包容和参与。这项研究将对任何寻求在大湖地区开发新的或修改现有水中心的组织有用，以满足日益增长的保护水质和生态系统完整性的需求。

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引用次数: 0

Dead giveaway: Rising mortality rates suggest effectiveness of Lake Erie grass carp (Ctenopharyngodon idella) response 死亡赠品：不断上升的死亡率表明伊利湖草鱼（Ctenopharyngodon idella）的反应是有效的

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

Journal of Great Lakes Research

Pub Date : 2025-06-06 DOI: 10.1016/j.jglr.2025.102606

Kaitlen Lang , Christine Mayer , Mark DuFour , Song Qian , William D. Hintz , Patrick Kočovský , Ryan Young , Matthew R. Acre , Eric Weimer , Tammy Wilson , Chris Kemp , John Dettmers , Lucas Nathan , Ryan Brown

Grass carp (Ctenopharyngodon idella) are large, invasive fish that threaten Lake Erie’s economy and ecosystem. Incidental catches of grass carp have occurred since the 1980s in Lake Erie, while multi-day removal events were carried out in 2014 and 2017. To mitigate ecosystem impacts, a large-scale, multi-agency response to remove as many grass carp as possible from the Lake Erie basin (“strike teams”) began in 2018 and has increased every year. To date, total annual removals of fish has been the primary measure of progress; however, total annual removals do not indicate how efforts are affecting the grass carp population. Population vital rates, such as mortality rate, can indicate population demographic changes and may provide an alternative approach to measure how removals have impacted the grass carp population. We estimated annual mortality rates using 553 grass carp, representing 82.9 % of all grass carp removed in the Lake Erie basin, using a hierarchical catch-curve model and catch-at-age data from 2014 to 2022. Annual average mortality rates were initially low (4.3 %) and increased between 2017 and 2022 with the highest mortality (13.6 %) observed in 2021. Positive correlations between mortality and the number of fish harvested per year suggest that removals may be driving increases in the grass carp mortality rate. This increase in mortality rate shows promise for controlling the spread of grass carp within the Lake Erie ecosystem. This research supports the needs of fishery managers to better understand grass carp population dynamics and the adaptive management framework identified in the Lake Erie Grass Carp Adaptive Response Strategy.

草鱼（Ctenopharyngodon idella）是一种大型入侵鱼类，威胁着伊利湖的经济和生态系统。自20世纪80年代以来，伊利湖发生了偶然捕获草鱼的情况，而2014年和2017年进行了为期数天的清除活动。为了减轻对生态系统的影响，2018年开始了一项大规模的多机构响应行动，从伊利湖流域（“突击队”）中尽可能多地清除草鱼，并且每年都在增加。迄今为止，鱼的年总捕获量一直是衡量进展的主要标准；然而，每年的总清除量并不能说明这些努力是如何影响草鱼种群的。种群动态率，如死亡率，可以表明种群的人口变化，并可能提供另一种方法来衡量清除如何影响草鱼种群。我们利用2014年至2022年的分层捕捞曲线模型和捕捞年龄数据，估算了553条草鱼的年死亡率，占伊利湖流域所有草鱼的82.9%。年平均死亡率最初很低（4.3%），在2017年至2022年期间有所上升，2021年死亡率最高（13.6%）。死亡率与每年收获的鱼的数量之间的正相关表明，清除可能是导致草鱼死亡率上升的原因。在伊利湖生态系统中，草鱼死亡率的上升表明了控制草鱼扩散的希望。本研究支持渔业管理者更好地了解草鱼种群动态和伊利湖草鱼适应响应策略中确定的适应性管理框架的需求。

{"title":"Dead giveaway: Rising mortality rates suggest effectiveness of Lake Erie grass carp (Ctenopharyngodon idella) response","authors":"Kaitlen Lang , Christine Mayer , Mark DuFour , Song Qian , William D. Hintz , Patrick Kočovský , Ryan Young , Matthew R. Acre , Eric Weimer , Tammy Wilson , Chris Kemp , John Dettmers , Lucas Nathan , Ryan Brown","doi":"10.1016/j.jglr.2025.102606","DOIUrl":"10.1016/j.jglr.2025.102606","url":null,"abstract":"<div><div>Grass carp (<em>Ctenopharyngodon idella</em>) are large, invasive fish that threaten Lake Erie’s economy and ecosystem. Incidental catches of grass carp have occurred since the 1980s in Lake Erie, while multi-day removal events were carried out in 2014 and 2017.To mitigate ecosystem impacts, a large-scale, multi-agency response to remove as many grass carp as possible from the Lake Erie basin (“strike teams”) began in 2018 andhas increased every year. To date, total annual removals of fish has been the primary measure of progress; however, total annual removals do not indicate how efforts are affecting the grass carp population. Population vital rates, such as mortality rate, can indicate population demographic changes and may provide an alternative approach to measure how removals have impacted the grass carp population. We estimated annual mortality rates using 553 grass carp, representing 82.9 % of all grass carp removed in the Lake Erie basin, using a hierarchical catch-curve model and catch-at-age data from 2014 to 2022. Annual average mortality rates were initially low (4.3 %) and increased between 2017 and 2022 with the highest mortality (13.6 %) observed in 2021. Positive correlations between mortality and the number of fish harvested per year suggest that removals may be driving increases in the grass carp mortality rate. This increase in mortality rate shows promise for controlling the spread of grass carp within the Lake Erie ecosystem. This research supports the needs of fishery managers to better understand grass carp population dynamics and the adaptive management framework identified in the Lake Erie Grass Carp Adaptive Response Strategy.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102606"},"PeriodicalIF":2.4,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonality interacts with mixed land use and conservation in controlling patterns of nutrient and pathogen export from agricultural watersheds 季节性与混合土地利用和保护在控制农业流域养分和病原体输出模式方面相互作用

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

Journal of Great Lakes Research

Pub Date : 2025-06-04 DOI: 10.1016/j.jglr.2025.102607

Anna E.S. Vincent , Jennifer L. Tank , Ursula H. Mahl , Kyle Bibby

Fertilizer runoff is a significant source of nutrients to streams draining agricultural watersheds and results in numerous downstream impacts including eutrophication and coastal hypoxia. Additionally, pathogen export linked to manure application poses a threat to human health and results in recreational closures. Agricultural conservation practices, such as the planting of winter cover crops (CC), can reduce nutrient losses to streams, but their impacts on pathogen transport remain understudied. From 2019 to 2022, we sampled every 2 weeks in three subwatersheds of the Paw Paw River Basin (Michigan, USA) to assess the role of CC in reducing dissolved nitrate (NO₃^–-N), ammonium (NH₄⁺-N), soluble reactive phosphorus (SRP), and the fecal bacterium Escherichia coli export. The three subwatersheds contain varying levels of agricultural land use, ranging from 41 to 77 %. Water column NO₃^–-N (mg L^-1) peaked during the winter and spring fallow season, while E. coli (CFU 100 mL⁻¹) peaked during summer, which points to different drivers controlling NO₃^–-N and pathogen export throughout the year. Increased daily yields of dissolved nutrient tended to coincide with more agricultural land cover; however, we measured highest daily yields of E. coli in the watershed with lowest agricultural land cover. Planting CC reduced NO₃^–-N yield by 10–31 %, NH₄⁺-N yield by 19–22 %, SRP yields by 3–11 %, and E. coli yields by 17–48 %, and therefore is effective at mitigating both nutrient and pathogen export from agricultural landscapes, but additional work is required to fully understand the dynamics (timing and drivers) controlling E. coli export in watersheds of mixed land use.

肥料径流是农业流域排水的重要营养来源，并导致许多下游影响，包括富营养化和沿海缺氧。此外，与施用肥料有关的病原体出口对人类健康构成威胁，并导致娱乐场所关闭。农业保护措施，如种植冬季覆盖作物（CC），可以减少河流的养分损失，但它们对病原体运输的影响仍未得到充分研究。从2019年到2022年，我们在美国密歇根州的Paw河流域的三个子流域每2周采样一次，以评估CC在减少溶解硝酸盐（NO3——N）、铵（NH4+-N）、可溶性活性磷（SRP）和粪便大肠杆菌出口中的作用。这三个子流域的农业用地比例各不相同，从41%到77%不等。水柱NO3—N （mg L-1）在冬季和春季休闲季节达到峰值，大肠杆菌（CFU 100 mL−1）在夏季达到峰值，说明全年控制NO3—N和病原菌输出的驱动因素不同。溶解养分日产量的增加往往与农业土地覆被的增加相一致；然而，我们在农业土地覆盖最低的流域测量了最高的大肠杆菌日产量。种植CC可使NO3—N产量降低10 - 31%，NH4+-N产量降低19 - 22%，SRP产量降低3 - 11%，大肠杆菌产量降低17 - 48%，因此可有效减少农业景观中的养分和病原体输出，但需要进一步研究控制混合土地利用流域大肠杆菌输出的动态（时间和驱动因素）。

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引用次数: 0