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

Larger larval sea lamprey (Petromyzon marinus) have longer survival times when exposed to the lampricide 3-trifluoromethyl-4-nitrophenol 较大的海七鳃鳗幼体（Petromyzon marinus）暴露于三氟甲基-4-硝基苯酚的七鳃鳗胺后存活时间较长

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.2025.102620

Allison M. Nalesnik , Emily L. Martin , Ian S. Kovacs , Connor S. Johnson , Emma I. Carroll , Aaron Jubar , William Hemstrom , Michael P. Wilkie , Erin S. Dunlop , Maria S. Sepulveda , Nicholas S. Johnson , Mark R. Christie

Invasive sea lamprey (Petromyzon marinus) in the Laurentian Great Lakes have negatively impacted ecologically and economically important fishes for nearly a century. To mitigate these effects, the lampricide 3-trifluoromethyl-4-nitrophenol (TFM) is applied annually on a rotating basis to selected Great Lakes tributaries to kill larval lamprey before they become juveniles, out-migrate to the lakes, and parasitize other fishes. It has been hypothesized that larval size (e.g., mass, length) may affect survival time in response to TFM. To test this hypothesis, we conducted an experiment with 8611 larvae across four temporal replicates, in which TFM concentrations equivalent to those used in present-day stream treatments were applied for up to 18 h. When examining the survival times of larval lamprey exposed to TFM, we found a significant, positive relationship between length, mass, toxicity, and their interactions. For every 1 mm increase in total length, a corresponding increase by 1 g of mass reduced survival time by 0.4315 min [95 % CI: 0.5283–0.2992] and vice versa (i.e., the significant interaction between length and mass revealed that as larvae increase in mass, the survival benefit to being longer decreases, and vice versa). The changes in total length and mass of larval sea lamprey stored in ethanol for 4 months was also quantified. The observation that five larvae survived well past the 12-hour time window of a typical TFM field treatment highlights the need for continuous monitoring and the development of new control strategies to ensure the continued effective management of this invasive species.

近一个世纪以来，入侵的七鳃鳗（Petromyzon marinus）对劳伦森五大湖的重要生态和经济鱼类造成了负面影响。为了减轻这些影响，每年在选定的五大湖支流轮流施用三氟甲基-4硝基酚（TFM），以在七鳃鳗幼鱼变成幼鱼、向外迁徙到湖泊并寄生于其他鱼类之前杀死它们。据推测，幼虫的大小（例如，质量，长度）可能会影响TFM的生存时间。为了验证这一假设，我们在四个时间重复中对8611条幼虫进行了实验，其中使用相当于当今溪流处理中使用的TFM浓度长达18小时。当检查暴露于TFM的幼虫的存活时间时，我们发现长度，质量，毒性及其相互作用之间存在显著的正相关关系。总长度每增加1 mm，质量每增加1 g，存活时间减少0.4315 min [95% CI: 0.5283-0.2992]，反之亦然（即长度与质量之间的显著交互作用表明，随着幼虫质量的增加，越长越有利于存活，反之亦然）。测定了在乙醇中保存4个月的海七鳃鳗幼鱼的总长度和总质量的变化。观察到5只幼虫在典型TFM现场处理的12小时时间窗口后存活良好，这突出了持续监测和开发新的控制策略的必要性，以确保对这种入侵物种的持续有效管理。

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引用次数: 0

Sediment-water nutrient exchange across a diked Lake Erie coastal wetland, Ohio, USA 美国俄亥俄州，伊利湖沿岸湿地的沉积物-水营养交换

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.2025.102658

Michael P. Back , Grace A. Watson , Emily B. Campbell , Hana C. Esber , Justin Myers , Corbin Kohart , W.Robert Midden , Silvia E. Newell , Lauren E. Kinsman-Costello

Coastal wetlands have the potential to mitigate nutrient pollution to the Great Lakes; however, a deeper understanding of how nutrients cycle between wetland sediment and surface water is still needed to calculate more accurate nutrient budgets. Using in situ and ex situ methods, we measured nutrient exchange at the sediment–water interface across a diked Lake Erie wetland (Turtle Creek Bay, Magee Marsh Wildlife Area, Ohio, USA). The wetland was recently reconnected to the neighboring stream with the goal of nutrient removal as part of the H2Ohio Initiative; however, historical management was aimed at creating waterfowl habitat. Vegetation now grows in distinct monotypic patches throughout the wetland. We characterized the site into five patches dominated by different vegetation groups: Typha spp., hardwoods, emergent, submerged, and floating vegetation. Sediments underlying emergent and submerged vegetation typically had greater rates of dissolved reactive phosphorus retention than those underlying hardwoods, but only when measured ex situ. Sediments in most patches released ammonium when measured ex situ but retained ammonium when measured in situ (using stacked resin bags), suggesting that ex situ intact sediment core incubations may overestimate the magnitude of nutrient exchange rates. Regardless of vegetation patch, nutrient exchange was negatively related to surface water nutrient concentrations and positively related to sediment nutrient concentrations, suggesting that diffusion is an important driver of nutrient retention and release. Our results focus on understanding nutrient exchange at the patch scale which can inform more accurate models for estimating whole system nutrient removal potential in Great Lakes coastal wetlands.

沿海湿地有可能减轻五大湖的营养污染；然而，需要更深入地了解湿地沉积物和地表水之间的营养循环，才能计算出更准确的营养收支。采用原位和非原位方法，我们测量了横跨伊利湖湿地（美国俄亥俄州马吉沼泽野生动物区海龟溪湾）的沉积物-水界面的营养交换。作为H2Ohio计划的一部分，湿地最近被重新连接到邻近的溪流，目的是去除营养物；然而，历史上的管理旨在创造水禽栖息地。植被现在生长在整个湿地独特的单型斑块中。我们将场地划分为5个斑块，以不同的植被类群为主导：台风、硬木、新兴植被、淹没植被和漂浮植被。在地表下和水下植被下的沉积物通常比在地表下的硬木具有更大的溶解活性磷保留率，但只有在非原位测量时才如此。大多数斑块的沉积物在移地测量时释放了铵，但在原位测量时（使用堆叠树脂袋）保留了铵，这表明移地完整沉积物核心孵卵可能高估了养分交换速率的大小。在不同植被斑块中，养分交换与地表水养分浓度呈负相关，与沉积物养分浓度呈正相关，表明扩散是养分保留和释放的重要驱动因素。我们的研究结果集中在了解斑块尺度上的养分交换，这可以为估计五大湖沿海湿地全系统养分去除潜力提供更准确的模型。

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引用次数: 0

Light-based small pelagic species fishing in Lake Albert: Divergent perceptions, conflicts, and implications for multispecies fishery management 阿尔伯特湖光基小型远洋物种捕捞：对多物种渔业管理的不同认识、冲突和影响

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

Journal of Great Lakes Research

Pub Date : 2025-10-01 DOI: 10.1016/j.jglr.2025.102664

Herbert Nakiyende , Jackson Efitre , Anthony Basooma , Mbilingi Bwambale , Dismas Mbabazi , Joyce Akumu , Veronica Mpomwenda , Winnie Nkalubo , Anthony Taabu-Munyaho , Samuel Bassa , Esther Kagoya , Bairon Mugeni , Gladys Bwanika , Lauren Chapman

Introduced around the turn of the 21st century, light-based fishing targeting small pelagic species (SPS) like Engraulicypris bredoi and Brycinus nurse (belonging to orders Cypriniformes and Characiformes, respectively, and known locally as muziri and rogoogi) has markedly transformed Lake Albert’s artisanal fishery. SPS now constitute an estimated 60–70 % of the lake’s annual catch, signalling a shift from the previously dominant large-bodied demersal species that defined the fishery until the 1990s. While this expansion reflects growing significance of SPS in contemporary fisheries, it has generated divergent perceptions and conflicts among stakeholders. These tensions are exacerbated by the lack of empirical evidence on the ecosystem-wide effects of light-based fishing, particularly its impacts on stocks of large-bodied species. This study, conducted across three landing sites (Dei, Kaiso, and Ntoroko) spatially spread along the Lake Albert shoreline, employed qualitative methods, including structured questionnaires and interviews, to investigate stakeholder perceptions of light-based fishing. Fishers targeting large-bodied species reported concerns over increased bycatch, gear damage, habitat degradation, and spatial competition. In contrast, stakeholders in the SPS sector emphasized the socio-economic benefits of the light fishery, particularly employment and income opportunities for youth and women along the entire value chain, from fishing to processing and trade. The contrasting views underscore the complexity of managing a rapidly evolving multispecies fishery. The findings highlight the urgent need for ecosystem-based assessments of light-based fishing impacts to inform science-based management strategies that can promote the sustainable growth of the SPS fishery while fostering coexistence and equity among diverse fisher groups.

在21世纪之交引入的以小型远洋物种（SPS）为目标的光捕鱼，如bredoi Engraulicypris和Brycinus nurse（分别属于鲤形目和特征目，当地称为muziri和rogoogi），显着改变了阿尔伯特湖的手工渔业。SPS现在估计占该湖年捕鱼量的60 - 70% %，这标志着直到20世纪90年代之前主导该渔业的大型底栖物种的转变。虽然这种扩大反映了SPS在当代渔业中日益重要的意义，但它在利益攸关方之间产生了不同的看法和冲突。由于缺乏关于光基捕鱼对整个生态系统的影响的经验证据，特别是其对大型物种种群的影响，这种紧张关系更加加剧。本研究在三个着陆点（Dei、Kaiso和Ntoroko）进行，这些着陆点沿艾伯特湖海岸线在空间上分布，采用定性方法，包括结构化问卷调查和访谈，调查利益相关者对光基捕鱼的看法。以大型物种为目标的渔民报告了对副渔获物增加、渔具损坏、栖息地退化和空间竞争的担忧。相比之下，SPS部门的利益攸关方强调了轻渔业的社会经济效益，特别是青年和妇女在从捕捞到加工和贸易的整个价值链上的就业和收入机会。两种截然不同的观点凸显了管理快速发展的多物种渔业的复杂性。研究结果强调，迫切需要基于生态系统的光基捕捞影响评估，为基于科学的管理战略提供信息，这些战略可以促进SPS渔业的可持续增长，同时促进不同渔民群体之间的共存和公平。

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引用次数: 0

A multi-proxy reconstruction of coastal processes and Lake Erie flood events from Magee Marsh, northern Ohio 俄亥俄州北部马吉沼泽沿海过程和伊利湖洪水事件的多代理重建

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.2025.102648

Sean M. Loeffler , Ethan J. Tiong , Mark Baskaran , Thomas A. Bianchette

Along the margins of the Great Lakes of North America, lake level fluctuations and flood events threaten coastal environments and infrastructure. However, little is known about coastal processes over centennial (or longer) timescales along these Great Lakes. In order to document overwash from Lake Erie that predates historical records, sediment cores MG19-3 and MG21-2 were extracted from Magee Marsh Wildlife Area on Lake Erie’s southwestern shore. Both cores were subjected to loss-on-ignition and x-ray fluorescence analysis; for core MG21-2, microfossils were analyzed, and chronology was established by ¹⁴C and ²¹⁰Pb_xs dating, while grain size was analyzed for core MG19-3. Cores consist of uniform clayey silt at the base overlain successively by a layer of sandy silt with sparse pebbles and shells, a thin layer of dark clay and silt, and a layer of coarse sand, pebbles, and shells. The uppermost sediments are organic-rich silt and peaty material. Sand layers contain low organic content, elevated carbonate content, and unique geochemical signatures relative to adjacent sediment depths. The sand layer signatures demonstrate that at least two intervals of overwash from Lake Erie occurred between 1430 CE (∼520 cal yr BP) and 1867 CE, attributed to separate processes of normal wave action and storm surge impact. These findings reveal that Magee Marsh serves as a repository to capture and preserve overwash deposits from Lake Erie. Future work investigating other Great Lakes coastal sites will enable regional correlation and insight into the periodicity and long-term impacts of these extreme events.

在北美五大湖的边缘，湖泊水位波动和洪水事件威胁着沿海环境和基础设施。然而，人们对五大湖百年（或更长）时间尺度上的海岸过程知之甚少。为了记录历史记录之前伊利湖的冲积，从伊利湖西南岸的马吉沼泽野生动物区提取了MG19-3和MG21-2沉积物岩心。两个岩芯都进行了着火损耗和x射线荧光分析；MG21-2岩心进行了微化石分析，并通过14C和210Pbxs定年确定了岩心年代学，MG19-3岩心进行了粒度分析。岩心由均匀的粘土粉砂组成，在底部依次上覆一层含稀疏卵石和贝壳的砂质粉砂，一层薄薄的深色粘土和粉砂，以及一层粗砂、卵石和贝壳。最上层沉积物为富有机质淤泥质和泥炭质。砂层有机质含量低，碳酸盐含量高，相对于邻近沉积物深度具有独特的地球化学特征。砂层特征表明，伊利湖在1430 CE （~ 520 cal yr BP）和1867 CE之间至少发生了两次冲过，这是由正常波浪作用和风暴潮影响的单独过程造成的。这些发现表明，马吉沼泽是一个储存库，可以捕获和保存伊利湖的冲积沉积物。未来调查其他五大湖沿海地区的工作将使区域相关性和洞察这些极端事件的周期性和长期影响。

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引用次数: 0

Microhabitat complexity and herpetofaunal diversity in a community-managed Afrotropical wetland of Lake Victoria 维多利亚湖群落管理的非洲热带湿地微生境复杂性和动物多样性

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.2025.102638

Mathias Behangana , Achilles Byaruhanga , Michael Kibuule , Fiona Milembe , Violet Kantono , Fabio Petrozzi , Luca Luiselli

Wetlands play a critical role in sustaining biodiversity, particularly in tropical ecosystems where habitat loss and anthropogenic disturbances are accelerating. At the same time, community conservation has become a central topic in modern conservation biology. Therefore, in conservation and management terms, it is especially interesting to evaluate the biodiversity patterns in wetlands managed by local communities. This study assessed the diversity, abundance, and conservation status of herpetofauna in the Mabamba Bay Wetland, a key biodiversity reservoir in central Uganda within the Lake Victoria system, also designated as a Ramsar site. Through visual encounter surveys, audio sampling, and dip-netting conducted across five representative sites, we recorded 17 amphibian species and 18 reptile species. Amphibians were more diverse in sites with complex and less-disturbed habitats, while reptiles dominated more disturbed and open areas. Diversity indices, species accumulation curves, and richness estimators (Chao 1, Jackknife 1 & 2) revealed significant spatial heterogeneity and suggested under-sampling for reptiles. Conservation status analysis indicated that most species were of Least Concern, though notable exceptions included Degen’s toad (Sclerophrys vittata), African rock python (Python sebae), and Nile crocodile (Crocodylus niloticus).

湿地在维持生物多样性方面发挥着关键作用，特别是在栖息地丧失和人为干扰正在加速的热带生态系统中。与此同时，群落保护已成为现代保护生物学的中心课题。因此，在保护和管理方面，评估当地社区管理的湿地的生物多样性模式是特别有趣的。本研究评估了Mabamba湾湿地的爬行动物的多样性、丰度和保护状况。Mabamba湾湿地是乌干达中部维多利亚湖系统内一个重要的生物多样性水库，也被指定为拉姆萨尔湿地。通过视觉接触调查、音频采样和蘸网，我们在5个有代表性的地点记录了17种两栖动物和18种爬行动物。在生境复杂且受干扰程度较低的地区，两栖动物的种类较多，而在受干扰程度较高的开放地区，爬行动物占主导地位。多样性指数、物种积累曲线和丰富度估计（Chao 1、Jackknife 1和2）显示了爬行动物显著的空间异质性和采样不足。保护现状分析表明，除德根蟾蜍（scerophrys vittata）、非洲岩蟒（python sebae）和尼罗鳄（Crocodylus niloticus）外，大多数物种为最不受关注的物种。

{"title":"Microhabitat complexity and herpetofaunal diversity in a community-managed Afrotropical wetland of Lake Victoria","authors":"Mathias Behangana , Achilles Byaruhanga , Michael Kibuule , Fiona Milembe , Violet Kantono , Fabio Petrozzi , Luca Luiselli","doi":"10.1016/j.jglr.2025.102638","DOIUrl":"10.1016/j.jglr.2025.102638","url":null,"abstract":"<div><div>Wetlands play a critical role in sustaining biodiversity, particularly in tropical ecosystems where habitat loss and anthropogenic disturbances are accelerating. At the same time, community conservation has become a central topic in modern conservation biology. Therefore, in conservation and management terms, it is especially interesting to evaluate the biodiversity patterns in wetlands managed by local communities. This study assessed the diversity, abundance, and conservation status of herpetofauna in the Mabamba Bay Wetland, a key biodiversity reservoir in central Uganda within the Lake Victoria system, also designated as a Ramsar site. Through visual encounter surveys, audio sampling, and dip-netting conducted across five representative sites, we recorded 17 amphibian species and 18 reptile species. Amphibians were more diverse in sites with complex and less-disturbed habitats, while reptiles dominated more disturbed and open areas. Diversity indices, species accumulation curves, and richness estimators (Chao 1, Jackknife 1 & 2) revealed significant spatial heterogeneity and suggested under-sampling for reptiles. Conservation status analysis indicated that most species were of Least Concern, though notable exceptions included Degen’s toad (<em>Sclerophrys vittata</em>)<em>,</em> African rock python (<em>Python sebae</em>), and Nile crocodile (<em>Crocodylus niloticus)</em>.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 5","pages":"Article 102638"},"PeriodicalIF":2.5,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242325","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

Spotless round gobies: A poorly described phenotype of Neogobius melanostomus 一尘不染的圆虾虎鱼：一种描述不佳的黑口新虾虎鱼的表型

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.2025.102643

Jesica Goldsmit , Yves Paradis , Philippe Brodeur , Virginie Boivin , Nathalie Vachon , Guillaume Côté , Sarah Aubé

The round goby (Neogobius melanostomus) is a widely distributed invasive fish, typically distinguished from morphologically similar native species by a prominent black spot on the first dorsal fin. Although spotless individuals have been reported, their prevalence and characteristics remain poorly documented. Spotless round gobies were discovered in the St. Lawrence and Richelieu rivers in Quebec, Canada. Mitochondrial DNA analysis confirmed their identity as N. melanostomus, indicating that the spotless form represents a phenotypic variant within the species. In both rivers, the frequency of this phenotype was found to be low, ranging from 0.18 to 1.14%, with no apparent association with sex and body length. To contextualize these findings, a literature review on this phenotype and its occurrence is presented. The existence of spotless round gobies may challenge public awareness and monitoring efforts, particularly those that rely on the presence of the typical dorsal spot for accurate species identification.

圆虾虎鱼（Neogobius melanostomus）是一种分布广泛的入侵鱼类，与形态相似的本地物种的典型区别在于第一背鳍上有一个突出的黑点。尽管有报道称有无斑点的个体，但它们的流行和特征仍然缺乏文献记载。在加拿大魁北克省的圣劳伦斯河和黎塞留河发现了一尘不染的圆虾虎鱼。线粒体DNA分析证实了它们的身份是N. melanostomus，表明一尘不染的形式代表了物种内的表型变异。在这两条河流中，这种表型的出现频率较低，在0.18% ~ 1.14%之间，与性别和体长无明显关联。为了将这些发现联系起来，我们对这种表型及其发生进行了文献综述。毫无斑点的圆虾虎鱼的存在可能会挑战公众的意识和监测工作，特别是那些依赖于典型背斑的存在来准确识别物种的人。

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引用次数: 0

Contrasting bacterial diversity, community composition, and metabolic function of the sediment between two different regions in lake Chaohu, China 巢湖不同区域沉积物细菌多样性、群落组成及代谢功能对比

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.2025.102621

Keqiang Shao , Chengrong Bai , Xingyu Jiang , Yang Hu , Xiangming Tang , Guang Gao

Lake Chaohu, the fifth-largest freshwater lake in China, has been experiencing severe eutrophication and algal bloom problems. Owing to differences in trophic status, the lake is divided into two distinct regions. However, the sediment bacterial communities within the lake remain poorly understood. This study aims to fill this knowledge gap by comparing sediment bacterial communities between the two different lake regions using 16S rRNA gene amplicon sequencing. A total of 1,222,845 high-quality sequences were generated, encompassing 92 phyla and 3296 genera across 20 surface sediment samples. The results indicated that the pH, loss on ignition (LOI), and the total nitrogen (TN), total phosphorus (TP), and total organic carbon (TOC) concentration of sediments in the western region were significantly higher than those in the eastern region. Furthermore, bacterial α-diversity, β-diversity, and community composition in the sediments exhibited marked differences between the two lake regions. The functional profiles of the bacterial populations also revealed statistically significant differences in predicted functional composition among the two different lake regions. Redundancy analysis (RDA) identified that TN, TP, and TOC are the primary factors influencing the variations of sediment bacterial communities between the two different lake regions. Overall, this study substantially advances our understanding of sediment microbial ecology in eutrophic freshwater lakes.

巢湖是中国第五大淡水湖，一直面临着严重的富营养化和藻华问题。由于营养状况的不同，湖泊被划分为两个不同的区域。然而，湖中的沉积物细菌群落仍然知之甚少。本研究旨在通过16S rRNA基因扩增子测序比较两个不同湖区的沉积物细菌群落来填补这一知识空白。共获得高质量序列1,222,845个，涵盖92门，3296属，覆盖20个地表沉积物样本。结果表明：西部沉积物的pH、燃失量（LOI）、总氮（TN）、总磷（TP）和总有机碳（TOC）浓度显著高于东部。两湖区沉积物中细菌α-多样性、β-多样性和群落组成差异显著。细菌种群的功能谱也显示了两个不同湖区预测功能组成的统计学差异。冗余分析（RDA）表明，TN、TP和TOC是影响两湖区沉积物细菌群落变化的主要因素。总的来说，本研究极大地促进了我们对富营养化淡水湖沉积物微生物生态学的认识。

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引用次数: 0

Movement characterizations of stocked juvenile lake sturgeon (Acipenser fulvescens) within the Genesee River, NY 储藏湖鲟幼鱼（Acipenser fulvescens）在Genesee河内的运动特征

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.2025.102655

Kyle T. Morton , Dimitry Gorsky , Dawn Dittman , Matthew E. Altenritter

Knowledge of the movements of post-stocked juvenile lake sturgeon (Acipenser fulvescens) within and beyond the Genesee River of New York is limited. Describing lake sturgeon post-stocking movements could further the understanding of population structure and the delineation of nursery habitat. This project aimed to characterize the movements of juvenile sturgeon by tagging and tracking 69 age-0 + and 30 sub-adult lake sturgeon with acoustic transmitters from 2019 to 2021. Habitat use was disproportionate between the two life stages of juvenile sturgeon; age-0 + lake sturgeon primarily inhabited the upper reaches of the Genesee River, while sub-adults primarily utilized the lower dredged reaches of the Genesee River and the embayment outside of the river. A lower proportion of age-0 + lake sturgeon left the Genesee River relative to sub-adults, with seven sub-adult sturgeon (23.3 % of all tagged) moving to new habitats over 100 km away. Water temperature, discharge, and dissolved oxygen concentrations best predicted lake sturgeon movement within the river. These results indicate that the Genesee River is serving as a nursery habitat for juvenile lake sturgeon and that connectivity exists among the river, nearshore Lake Ontario habitats, and other tributaries. Such information is important when considering that management efforts for this species are commonly uniform across a system, while our results suggest a broader metapopulation framework may be relevant.

在纽约的Genesee河内外，关于放养后幼年湖鲟（Acipenser fulvescens）的运动的知识是有限的。描述湖鲟放养后的动态可以进一步了解湖鲟种群结构和幼鱼栖息地的划分。该项目旨在通过在2019年至2021年期间用声学发射器标记和跟踪69条0岁以上和30条亚成年湖鲟，来描述幼年鲟鱼的运动特征。中华鲟幼鱼两个生命阶段的生境利用不成比例；0岁以上湖鲟主要栖息在Genesee河上游，亚成鱼主要利用Genesee河下游的疏浚河段和河外的围堰。与亚成鱼相比，0岁以上的湖鲟离开Genesee河的比例较低，有7条亚成鱼（占所有被标记鲟鱼的23.3%）迁移到100公里以外的新栖息地。水温、流量和溶解氧浓度最能预测湖中鲟鱼在河中的运动。这些结果表明，Genesee河是幼湖鲟的育苗栖息地，并且在河流，近岸安大略湖栖息地和其他支流之间存在连通性。当考虑到对该物种的管理努力通常在整个系统中是统一的时，这些信息是重要的，而我们的结果表明更广泛的元种群框架可能相关。

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引用次数: 0

Taxonomic diversity of bacterial communities in the sediments of a soda lake in Arusha, Tanzania 坦桑尼亚阿鲁沙苏打湖沉积物中细菌群落的分类多样性

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.2025.102649

Sadikiel E. Kaale , Robert S. Machang’u , Thomas J. Lyimo

Soda lakes are special ecosystems with high salinity and alkalinity, notably found in the Great Rift Valley of East Africa. Given the unique nature of soda lakes, it is interesting and valuable to examine their bacterial composition as an initial step towards bioprospecting. This study provides the first metagenomic snapshots of bacterial communities inhabiting Lake Natron sediments using the 16S rRNA gene sequenced using a PacBio sequencing system. Results show high abundance and diversity of species in general, with notable dominance of Firmicutes, Bacteroidota, Actinomycetota, and Proteobacteria with the relative abundances of 45.21 %, 25.23 %, 12.59 %, and 23.29 %, respectively. At the class level, Bacteroidia (23.54 %), Gammaproteobacteria (22.32 %), Bacilli (19.66 %), and Clostridia (22.32 %) were the most dominant classes. At lower taxonomic ranks (especially at the genus and species levels), there was an increase in the percentage of unknown and “Candidate Phyla” species (i.e., those discovered using genetic methods but not yet fully characterized or classified), suggesting the potential presence of new bacterial taxa in Lake Natron. The diversity indices revealed a high level of community diversity, with a large number of species, the presence of rare species, and an even distribution of bacteria across the sampling points. Although this study provides the first report on the existence of different bacterial taxa in Lake Natron, additional investigation into the biotechnological importance of the found species is of importance; hence, a functional metagenomic study is advised.

苏打湖是一种特殊的高盐度和高碱度生态系统，主要分布在东非大裂谷。鉴于苏打湖的独特性质，研究其细菌组成作为生物勘探的第一步是有趣和有价值的。本研究利用PacBio测序系统对16S rRNA基因进行测序，提供了栖息在Natron湖沉积物中的细菌群落的第一个宏基因组快照。结果表明，总体上物种丰度和多样性较高，其中厚壁菌门、拟杆菌门、放线菌门和变形菌门优势显著，相对丰度分别为45.21%、25.23%、12.59%和23.29%。在纲水平上，Bacteroidia（23.54%）、Gammaproteobacteria（22.32%）、Bacilli（19.66%）和Clostridia（22.32%）为优势纲。在较低的分类等级（特别是属和种水平）上，未知和“候选门”物种（即使用遗传方法发现但尚未完全表征或分类的物种）的百分比有所增加，表明Natron湖可能存在新的细菌分类群。群落多样性指数显示群落多样性水平高，物种数量多，存在稀有物种，细菌在各采样点分布均匀。虽然本研究首次报道了纳特龙湖不同细菌分类群的存在，但对所发现物种的生物技术重要性的进一步研究具有重要意义；因此，建议进行功能宏基因组研究。

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引用次数: 0

Reproductive condition, oocyte maturation, and life history variation in Lake Superior burbot (Lota lota) 苏必利尔湖鳕（Lota Lota）的生殖状况、卵母细胞成熟和生活史变化

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.2025.102661

Michael J. Woodworth, Jill B.K. Leonard

Burbot (Lota lota) are a cryophilic freshwater fish native to many cold-water systems in the Northern Hemisphere. Within the Laurentian Great Lakes, current fishing regulations and increasing popularity are leading to interest in population dynamics and the sustainability of current and future burbot populations. To understand population dynamics, it is important to better understand the reproductive ecology of burbot. Currently, little is known about the reproductive ecology and the variation within reproductive behavior of burbot. In this study, we evaluated the reproductive ecology of southern Lake Superior burbot by characterizing the timing of reproductively maturing adult burbot and assessing the final oocyte maturation process. Samples were collected during two sampling seasons, which spanned from December to April. Riverine-collected burbot had high proportions (>90 %) of reproductively maturing individuals matched with females in the final stages of oocyte development during a short (3–5 week) period. Alternatively, lacustrine-collected burbot had low proportions (24 %) of reproductively maturing individuals and low proportions of females within the final stages of oocyte development (16 %). Unlike riverine captures, lacustrine-captured individuals indicated a prolonged presence of reproductively maturing individuals that lasted from December to at least early April. These results suggest variation within the reproductive ecology of Lake Superior-residing burbot.

大闸鱼（Lota Lota）是一种嗜冷淡水鱼，原产于北半球的许多冷水系统。在劳伦森五大湖内，目前的捕鱼条例和日益普及使人们对种群动态和当前和未来的长须鲸种群的可持续性产生了兴趣。为了更好地了解种群动态，必须更好地了解burbot的生殖生态。目前，人们对burbot的生殖生态学和生殖行为的变化知之甚少。在这项研究中，我们通过表征成年burbot生殖成熟的时间和评估最终的卵母细胞成熟过程来评估南部苏必利尔湖burbot的生殖生态。样本是在12月至4月的两个采样季节收集的。在短（3-5周）的卵母细胞发育的最后阶段，河流采集的burbot有很高比例（> 90%）的生殖成熟个体与雌性配对。另外，湖采burbot的生殖成熟个体比例低（24%），卵母细胞发育最后阶段的雌性比例低（16%）。与河流捕获的个体不同，湖泊捕获的个体表明，从12月到至少4月初，生殖成熟个体的存在时间较长。这些结果表明苏必利尔湖栖息的白鱀鲸的生殖生态存在差异。

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