Journal of Great Lakes Research最新文献_第9页

Budgeting internal and external nutrient loads in a shallow freshwater bay: Disentangling bioturbator-mediated and net ambient nutrient fluxes 浅水湾内部和外部营养负荷的预算：解开生物turturager介导和净环境营养通量的纠缠

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

Journal of Great Lakes Research

Pub Date : 2025-04-26 DOI: 10.1016/j.jglr.2025.102584

Taylor C. Michael , Lauren E. Kinsman-Costello , David M. Costello

Shallow embayments are particularly vulnerable to eutrophication and harmful algal blooms (HABs). Most management efforts focus on reducing external nutrient (i.e., nitrogen [N] and phosphorus [P]) loading from landscape runoff, yet seasonal HABs persist. When external loads are lessened, the internal loading of nutrients may contribute to continued eutrophic conditions. We investigated internal loading, including the contribution of bioturbator-mediated sediment-surface water nutrient exchange, in Sandusky Bay, OH, USA, the largest embayment in Lake Erie. Sediment-surface water nutrient fluxes are driven by oxygen conditions, geochemical processes, and microbial nutrient processes. Invertebrate bioturbation can modify nutrient fluxes by transporting oxygenated surface water through burrows, into normally anoxic sediment, which can alter abiotic nutrient flux rates (i.e., via phosphorus sorption) and promote microbial nutrient processing (i.e., nitrogen transformations). We measured benthic invertebrate densities monthly across Sandusky Bay and quantified bioturbation-driven and ambient nutrient flux rates through intact sediment core experiments. We assessed the contribution of bioturbation to net ambient nutrient fluxes and compared internal loads (ambient and bioturbation-mediated) to external loads. Net ambient phosphorus and nitrogen fluxes varied across time, space, and oxygen conditions. Invertebrate bioturbation contributed to net internal fluxes, and internal phosphorus loads were similar in magnitude to external phosphorus loads while internal nitrogen loads were much smaller than external loads in Sandusky Bay during mid-summer. We demonstrate that invertebrates contribute greatly to internal fluxes and that dynamic bioturbation and ambient nutrient fluxes at the sediment–water interface of shallow bays contribute to internal loading in freshwater aquatic ecosystems.

浅海特别容易受到富营养化和有害藻华（HABs）的影响。大多数管理工作侧重于减少来自景观径流的外部营养物（即氮[N]和磷[P]）负荷，但季节性有害藻华仍然存在。当外部负荷减少时，营养物质的内部负荷可能会导致持续的富营养化状况。我们调查了伊利湖最大的海湾——美国俄亥俄州Sandusky湾的内部负荷，包括生物沉降器介导的沉积物-地表水营养交换的贡献。沉积物-地表水养分通量由氧条件、地球化学过程和微生物养分过程驱动。无脊椎动物的生物扰动可以通过将含氧地表水通过洞穴输送到通常缺氧的沉积物中来改变营养通量，这可以改变非生物营养通量速率（即通过磷吸附）并促进微生物营养处理（即氮转化）。我们每月测量桑达斯基湾的底栖无脊椎动物密度，并通过完整沉积物岩心实验量化生物湍流驱动和环境营养通量率。我们评估了生物扰动对净环境养分通量的贡献，并比较了内部负荷（环境负荷和生物扰动介导的负荷）和外部负荷。净环境磷和氮通量随时间、空间和氧气条件而变化。无脊椎动物的生物扰动对净内部通量有贡献，Sandusky Bay在仲夏期间，内部磷负荷与外部磷负荷的大小相似，而内部氮负荷远小于外部负荷。我们证明了无脊椎动物对内部通量的贡献很大，浅水湾沉积物-水界面的动态生物扰动和环境营养通量对淡水水生生态系统的内部负荷有贡献。

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引用次数: 0

Thermodynamic exposure reductions of PCBs available to Lumbriculus variegatus in Lake Erie region sediments amended with activated carbon 伊利湖地区沉积物中多氯联苯的热力学暴露减少

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

Journal of Great Lakes Research

Pub Date : 2025-04-25 DOI: 10.1016/j.jglr.2025.102582

Philip T. Gidley, Guilherme R. Lotufo, Paul R. Schroeder

A chemical activity-based assessment of polychlorinated biphenyl (PCB) bioaccumulation from Lake Erie region sediments was studied using polydimethylsiloxane (PDMS) coated fibers and Dow Corning (DC) silicone coated jars, both with ex situ mixing (i.e., agitation). Polymers equilibrated with the sediments were compared to bioaccumulation in blackworms (Lumbriculus variegatus), exposed to the sediments for 28 days. Sediments were from Cleveland Harbor, Ashtabula Harbor (Ohio, USA), and Buffalo River (New York, USA). The sediment from Ashtabula was amended with activated carbon (AC). Using lipid-polymer partition coefficients, the polymers were able to estimate actual bioaccumulation in worms, with close to a 1:1 relationship and r² = 0.94. If lipid normalized worm bioaccumulation was compared to equilibrated PDMS concentrations, there was a 20:1 ‘off-set’ (lipid concentration ≈ 20 × PDMS concentration), but the relation was still strong (r² = 0.87). Different doses of AC were mixed into Ashtabula sediment in the laboratory, corresponding to 1 %, 10 %, and 100 % of the native total organic carbon (TOC). Based on PCB concentrations in DC silicone, a target AC dose equal to 10 % of the TOC would substantially reduce (∼62 %) bioaccumulation of the more hydrophobic PCBs (log octanol–water partition coefficient > 6) from Ashtabula Harbor dredged material. Widespread AC amendment to surficial sediment of the eastern basin of Lake Erie may reduce the thermodynamic pressure of PCBs from that sediment source and allow for a continued decline in fish tissue concentrations.

采用聚二甲基硅氧烷（PDMS）涂层纤维和道康宁（DC）有机硅涂层罐，对伊利湖地区沉积物中多氯联苯（PCB）的生物积累进行了基于化学活性的评估。与沉积物平衡的聚合物与暴露于沉积物28天的黑虫（Lumbriculus variegatus）的生物积累进行了比较。沉积物来自克利夫兰港、阿什塔布拉港（美国俄亥俄州）和布法罗河（美国纽约州）。用活性炭（AC）对Ashtabula沉积物进行了改性。利用脂质-聚合物分配系数，聚合物能够估计蠕虫体内的实际生物积累，两者之间的关系接近1:1，r2 = 0.94。如果将脂质正常化的蠕虫生物积累与平衡的PDMS浓度进行比较，存在20:1的“偏移”（脂质浓度≈20 × PDMS浓度），但相关性仍然很强（r2 = 0.87）。在实验室中，将不同剂量的AC混合到Ashtabula沉积物中，分别相当于天然总有机碳（TOC）的1%、10%和100%。基于直流有机硅中的PCB浓度，目标交流剂量等于TOC的10%将大大减少（~ 62%）疏水性更强的PCB的生物积累(对数辛醇-水分配系数>；6)从Ashtabula港疏浚物料。伊利湖东部盆地表层沉积物的广泛AC修正可能会降低来自该沉积物源的多氯联苯的热力学压力，并允许鱼类组织浓度持续下降。

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引用次数: 0

Chironomid assemblage response to cultural eutrophication and dreissenid mussel establishment in the Bay of Quinte, Ontario 安大略省昆特湾拟鱼群落对养殖富营养化和贻贝繁殖的响应

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

Journal of Great Lakes Research

Pub Date : 2025-04-12 DOI: 10.1016/j.jglr.2025.102578

Lauren Alward , Isaac Armstrong , Stafford Rotehrá:kwas Maracle , Brian F. Cumming

The Bay of Quinte is a large (254 km²) embayment on Lake Ontario, which has experienced many environmental and ecological modifications since the arrival of European settlers. Extensive clearing of land and development of urban areas led to considerable eutrophication from anthropogenic nutrient loading in the late 1800s. The subsequent reduction of nutrient loading post-1977 was followed by the 1994 colonization of invasive dreissenid mussels, whose establishment was associated with benthification and an abrupt shift from a turbid eutrophic system to a clearer mesotrophic system. To investigate the response of the benthos to these stresses, a sediment core was collected in 2023, and sediment subsamples from 18 stratigraphic intervals were sifted to identify and enumerate subfossil chironomid (order: Diptera) assemblages. The cultural eutrophication of the bay was reflected in the sediment core by a shift from hypoxia-intolerant Tanytarsus lugens and T. mendax dominance to the more tolerant Chironomus sp. After 1977, Chironomus sp. decreased and Tanytarsus spp. and other hypoxia-intolerant taxa increased, consistent with nutrient abatement actions. Following dreissenid establishment (∼1994), there was a significant increase in chironomid head capsule abundance. ANOSIM suggests that the nutrient abatement actions may be a stronger driver of chironomid taxonomic and functional composition than the dreissenid invasion, though this may reflect the resolution and location of the sediment core. Overall, our results suggest chironomids experienced recovery from eutrophication and that benthic resource availability may have increased post-dreissenid invasion, which could benefit benthivorous fish.

昆特湾是安大略湖上的一个大海湾（254平方公里），自欧洲定居者到来以来，经历了许多环境和生态变化。19世纪后期，大面积的土地清理和城市地区的发展导致了大量的富营养化，这是由人为的营养负荷造成的。1977年后，营养负荷减少，随后是1994年入侵贻贝的定居，其建立与底栖化和从浑浊富营养化系统向更清晰的中营养化系统的突然转变有关。为了研究底栖动物对这些压力的响应，我们于2023年收集了一个沉积物岩心，并筛选了18个地层层段的沉积物亚样本，以鉴定和列举亚化石chironomid（目：双翅目）组合。富营养化主要体现在沉积物岩心中，由不耐缺氧的lugens Tanytarsus和T. mendax为主向耐缺氧的Chironomus sp为主转变。1977年以后，Chironomus sp减少，而Tanytarsus sp等耐缺氧类群增加，与营养物消减作用一致。dreissenid建立后（~ 1994年），摇尾鱼头囊丰度显著增加。ANOSIM表明，营养物质的减少可能是chironomid的分类和功能组成比dreissenid入侵更强大的驱动因素，尽管这可能反映了沉积物岩心的分辨率和位置。总的来说，我们的研究结果表明，摇尾鱼经历了从富营养化中恢复的过程，底栖生物资源的可用性可能增加了德利森入侵后的底栖生物资源，这可能有利于有益的鱼类。

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引用次数: 0

From stream to surf zone: Differences in the composition and succession of Lake Superior macroinvertebrate communities 从溪流到冲浪带：苏必利尔湖大型无脊椎动物群落组成和演替的差异

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

Journal of Great Lakes Research

Pub Date : 2025-04-11 DOI: 10.1016/j.jglr.2025.102580

Sam Miess , Mac Strand

The benthic communities in the surf zone of the Laurentian Great Lakes were historically diverse assemblages with typically lotic taxa. Conditions were suitable for these lotic taxa due to wave activity and strong, nearshore currents. Due to anthropogenic stressors, including the introduction of Dreissena mussels, surf zone communities have been all but decimated in the lower Great Lakes. Remaining communities persist along the shorelines of Lake Superior, where they are influenced by lake conditions and tributary inputs. Despite their ecological importance, the relationship between these Great Lakes surf zone communities, nearby tributary communities, and the confluence (i.e., tributary mouth) communities has remained largely unexplored. This study compared the composition and succession of Lake Superior communities at three sites: tributary, confluence, and surf zone. Hester-Dendy multiplate samplers (n = 7 per site) were deployed for ∼ 28-day periods over the course of the ice-free season (May through October) to assess community composition. Although diversity was similar between sites, community composition was distinct between the sites across all sample periods. Overall, compositional shifts were greater along the shoreline community, followed by confluence and tributary communities. The magnitude of compositional shifts, as well as diversity and composition, varied across the sample periods. These results suggest these communities are distinct, exhibiting compositional shifts that appear to correspond with production peaks at each site. As warmer temperatures and intensified storms affect Lake Superior in the coming decades, it is important that further research explore the ecology of tributary, confluence, and surf zone communities to better preserve these fascinating communities.

劳伦森五大湖冲浪带的底栖生物群落在历史上是多样化的组合，具有典型的lotic分类群。由于波浪活动和强烈的近岸洋流，这些条件适合于这些深海分类群。由于人为的压力因素，包括德莱塞纳贻贝的引入，五大湖下游的冲浪区群落几乎被摧毁。剩余的群落继续沿着苏必利尔湖的海岸线存在，在那里它们受到湖泊条件和支流输入的影响。尽管它们具有重要的生态意义，但这些五大湖冲浪带群落、附近支流群落和汇合处（即支流口）群落之间的关系在很大程度上仍未被探索。本研究比较了苏必利尔湖支流、汇合处和冲浪带三个地点的群落组成和演替。在无冰季节（5月至10月）期间，部署了Hester-Dendy多板采样器（每个站点n = 7），为期28天，以评估群落组成。虽然各样点之间的多样性相似，但群落组成在各样点之间存在差异。总体而言，沿海岸线群落的组成变化较大，其次是汇流和支流群落。组成变化的幅度，以及多样性和组成，在不同的样本时期有所不同。这些结果表明，这些群落是不同的，其组成变化似乎与每个站点的生产高峰相对应。随着未来几十年气温升高和风暴加剧对苏必利尔湖的影响，进一步研究支流、汇合处和冲浪带群落的生态，以更好地保护这些迷人的群落是很重要的。

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引用次数: 0

Source and longevity of streambed sediment and phosphorus retention in a lake-plain tributary of the Maumee River 莫米河湖平原支流河床沉积物和磷滞留的来源和寿命

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

Journal of Great Lakes Research

Pub Date : 2025-04-10 DOI: 10.1016/j.jglr.2025.102575

Tanja N. Williamson , Faith A. Fitzpatrick , Diana L. Karwan , Rebecca M. Kreiling , James D. Blount , Dayle J. Hoefling

We described abundance and source of soft, fine-grained, streambed sediment and associated phosphorus (sed-P) during summer low flow in Little Flatrock Creek (LFR), a channelized tributary of the Maumee River and western Lake Erie. Reach-level assessments compared streambed-sediment storage to streambank erosion. Streambed sediment was fingerprinted and analyzed for sed-P and the potential for P de/sorption between the water column and streambed sediment. The ratio of two fallout radionuclides apportioned “new sediment” in streambed storage. Basin-wide streambed-sediment storage exceeded both annual streambank erosion and the annual suspended-sediment load. Streambed sediment was generally a mix of streambank and cropland sources and each equaled or exceeded abundance of new streambed sediment, indicating accumulation of sediment from both sources during the current agricultural cycle. The implication is that this mix of new and old sediment, and legacy P, takes multiple events and seasons to be transported downstream. Streambed sediment had the potential to adsorb dissolved P (DP) from the water column, with sed-P stored in the silt + clay fraction similar to the annual particulate-P (total-dissolved) load transported with suspended sediment, but with lower concentrations than cropland- and streambank-sourced sediment. This indicates supplementation of water-column DP as sediment settles to the bottom and a lag between land and channel management and in-channel P availability. Storage of fine-grained sediment and sed-P in this lake-plain/bed basin is distinct from another Maumee headwater tributary with glacial-moraine controlled geomorphology. The implication is that streambank erosion, in-channel sediment accumulation, and the resultant total-dissolved-sediment P spiral differ based on geomorphic setting and drainage history.

本文描述了莫米河（Maumee River）和伊利湖（Lake Erie）西部的一条河道化支流——小Flatrock Creek （LFR）夏季低流量期间，软质、细粒、河床沉积物和伴生磷（ed- p）的丰度和来源。河段水平评估比较了河床泥沙储存和河岸侵蚀。对河床沉积物进行指纹图谱分析，并分析了水柱和河床沉积物之间的磷吸附潜力。两种沉降放射性核素的比例分配了河床储存中的“新沉积物”。全流域河床输沙量均超过年河岸侵蚀量和年悬沙量。河床沉积物通常是河岸和农田来源的混合物，每一种都等于或超过新河床沉积物的丰度，表明在当前的农业周期中，这两种来源的沉积物都有积累。这意味着新旧沉积物和遗留P的混合需要经过多个事件和季节才能向下游输送。河床沉积物具有从水柱中吸附溶解P （DP）的潜力，泥沙+粘土组分中储存的颗粒P（总溶解P）与悬浮沉积物输送的年颗粒P（总溶解P）负荷相似，但浓度低于农田和河滩沉积物。这表明随着沉积物沉降到底部水柱DP的补充，以及陆地和河道管理与河道内P有效性之间的滞后。该湖平原/河床盆地的细粒沉积物和磷的储存与另一条冰川-冰碛控制地貌的莫米源头支流不同。研究结果表明，不同的地貌背景和流域历史对河岸侵蚀、河道内泥沙淤积及其形成的总溶解泥沙P螺旋有不同的影响。

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引用次数: 0

Quantifying the increase in shoreline armoring along Michigan’s Lake Michigan coast associated with rising lake level (2014–2020) 量化密歇根湖沿岸岸线装甲的增加与湖泊水位上升的关系（2014-2020年）

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

Journal of Great Lakes Research

Pub Date : 2025-04-10 DOI: 10.1016/j.jglr.2025.102571

Ethan J. Theuerkauf , Brendan M.J. Burchi , Layni Wyns

The Great Lakes’ shorelines, particularly those of Lake Michigan, have undergone substantial transformations due to rising water levels and increased wave energy from 2014 to 2020. This period saw extensive erosion of beaches, dunes, and bluffs, prompting coastal property owners to install shoreline armoring to protect their properties. However, this protective measure often leads to unintended consequences, such as disrupted sediment transport and negative impacts on ecological communities. To quantify the armoring response to rising lake level, the extent of shoreline armoring along Michigan’s Lake Michigan coast was documented in 2021 (post-peak high water) and compared to publicly available shoreline armoring data from 2014 (pre-lake level rise). The research revealed a nearly fivefold increase in armoring from 2014 to 2021 along the coast, with the most significant increases observed in the southern section near larger towns and cities. Despite the protective intent, this widespread armoring raises concerns about its long-term effects on coastal ecosystems and geomorphology, highlighting the need for further research and informed policy decisions to balance protection needs with ecosystem function and integrity.

从2014年到2020年，由于水位上升和波浪能增加，五大湖的海岸线，特别是密歇根湖的海岸线发生了实质性的变化。这一时期，海滩、沙丘和悬崖受到了广泛的侵蚀，促使沿海财产所有者安装岸线装甲来保护他们的财产。然而，这种保护措施往往会导致意想不到的后果，如泥沙运输中断和对生态群落的负面影响。为了量化对湖泊水位上升的装甲响应，研究人员于2021年记录了密歇根湖沿岸岸线装甲的范围（高峰后高水位），并与2014年公开的岸线装甲数据（湖前水位上升）进行了比较。研究显示，从2014年到2021年，沿海地区的装甲装备增加了近5倍，其中南部靠近较大城镇的地区增幅最大。尽管有保护意图，但这种广泛的装甲引起了人们对其对沿海生态系统和地貌的长期影响的担忧，强调需要进一步研究和明智的政策决定，以平衡保护需求与生态系统功能和完整性。

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引用次数: 0

Numerical study of wave-driven flooding on Lake Ontario 安大略湖波浪驱动洪水的数值研究

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

Journal of Great Lakes Research

Pub Date : 2025-04-09 DOI: 10.1016/j.jglr.2025.102577

Andrew Cornett , Behnaz Ghodoosipour , Mitchel Provan , Enda Murphy , Mike Shantz

In this study, four high-resolution numerical models of nearshore wave propagation, runup, overtopping, and coastal flooding were developed using the open source XBeach model for three sites on the Canadian shore of Lake Ontario where flooding occurred in recent years. The models were qualitatively validated through comparison with photographs of flooding from these sites, and then used to model 24 to 48 combinations of water level and wave condition at each site. A set of flood metrics were developed and computed from the simulation output based on the potential impacts to waterfront buildings and roads. Relationships were established between the flood severity metrics, lake level, and incident wave conditions at each site. Results show that the flooded area, the number of flooded houses, and the length of flooded roads were influenced by both water levels and wave conditions, generally increasing with rising water level and increasing wave height. However, the rate of increase varied from site to site depending on local factors and conditions. Approximately linear relationships were found in some cases, whereas highly nonlinear relationships were identified in others. The study highlights the importance of wave action in initiating flooding at water levels below the threshold required to cause flooding under calm conditions, and exacerbating flooding at water levels above this threshold. This study was undertaken to support the International Joint Commission’s Great Lakes-St. Lawrence River Adaptive Management Committee and International Lake Ontario-St. Lawrence River Board in assessing strategies for regulating outflows from Lake Ontario into the St. Lawrence River.

在这项研究中，利用开源的XBeach模型，针对近年来发生洪水的加拿大安大略湖沿岸的三个地点，开发了四个高分辨率的近岸波传播、上升、漫顶和沿海洪水的数值模型。通过与这些地点的洪水照片进行比较，这些模型得到了定性验证，然后用于模拟每个地点24到48种水位和波浪条件的组合。基于对滨水建筑和道路的潜在影响，我们根据模拟结果制定并计算了一套洪水指标。建立了每个站点的洪水严重程度指标、湖泊水位和入射波条件之间的关系。结果表明：洪水淹没面积、房屋数量和道路长度受水位和波浪条件的共同影响，总体上随着水位的上升和浪高的增加而增加；然而，根据当地的因素和条件，增加的速度因地而异。在某些情况下发现近似线性关系，而在其他情况下发现高度非线性关系。该研究强调了波浪作用的重要性，在平静条件下，当水位低于引发洪水所需的阈值时，波浪作用会引发洪水，而当水位高于该阈值时，波浪作用会加剧洪水。进行这项研究是为了支持国际联合委员会的大湖-圣。劳伦斯河适应管理委员会和国际湖泊安大略-圣。劳伦斯河委员会评估从安大略湖流入圣劳伦斯河的管制策略。

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引用次数: 0

Sedimentary recorded nitrogen-transforming microbes reflect climate fluctuations in a glacial lake on the Qinghai-Tibetan Plateau over a millennium timescale 沉积记录的氮转化微生物反映了青藏高原冰湖千年时间尺度上的气候波动

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

Journal of Great Lakes Research

Pub Date : 2025-04-07 DOI: 10.1016/j.jglr.2025.102579

Jing Wang , Hanxiao Zhang , Shouliang Huo , Yong Liu , Jingtian Zhang

We used sedimentary ancient DNA (sedaDNA) to reveal the temporal dynamics of the microbial community responsible for nitrogen (N) transformation within Lake Gyaring located on Qinghai-Tibetan Plateau over the past 1400 years. Our results revealed that the change points of microbial composition linked to N-transforming reactions occurred at ∼769 CE, ∼1286 CE, and ∼1850 CE, preceding the corresponding recorded climatic stages—the beginning of the Medieval Warm Period, the transition between the Medieval Warm Period and Little Ice Age, and the transition between the Little Ice Age and the Current Warm Period, respectively—by approximately 0–30 years. The dominant genus Spirochaeta and Anaeromyxobacter participating in N₂ fixation and dissimilatory nitrate reduction to ammonium (DNRA) underwent a sharp decrease, while the prevalent components Iamia, Chitinophaga, Nitrospira, and Nitrosospira involved in NH₄⁺ assimilation, ammonification, and nitrification exerted an increase shift at ∼1300 CE. These variations closely matched evident decreases in total nitrogen (TN) content, total organic carbon (TOC) content, and the organic carbon to nitrogen (C:N) ratio, as well as a noticeable increase in TP content at ∼1300 CE. Partial least square path modeling revealed that those nutrient variations induced by climate fluctuations were the predominant driver for the microbial community succession with respect to N transformation. The prevailing community structure across distinct climate periods mainly arose from preferences of the microbial taxa for nutrient loading.

利用沉积古DNA （sedaDNA）揭示了青藏高原嘉陵湖1400年来负责氮转化的微生物群落的时间动态。我们的研究结果表明，与n转化反应相关的微生物组成的变化点发生在~ 769 CE、~ 1286 CE和~ 1850 CE，比相应的记录气候阶段——中世纪温暖期开始、中世纪温暖期和小冰期之间的过渡以及小冰期和当前温暖期之间的过渡——分别早了大约0-30年。参与N2固定和异化硝态氮还原（DNRA）的优势菌属螺旋体（Spirochaeta）和厌氧杆菌（Anaeromyxobacter）急剧减少，而参与NH4+同化、氨化和硝化作用的主要菌属Iamia、Chitinophaga、Nitrospira和Nitrosospira在~ 1300 CE时发生了增加的变化。这些变化与总氮（TN）含量、总有机碳（TOC）含量和有机碳氮（C:N）比的明显下降以及TP含量在~ 1300 CE时的显著增加密切相关。偏最小二乘路径模型表明，气候波动引起的养分变化是微生物群落演替中氮转化的主要驱动力。不同气候时期的群落结构主要是由微生物类群对养分负荷的偏好引起的。

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引用次数: 0

Regime shifts in satellite-derived chlorophyll within the Laurentian Great Lakes 劳伦森五大湖内卫星衍生叶绿素的状态变化

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

Journal of Great Lakes Research

Pub Date : 2025-04-03 DOI: 10.1016/j.jglr.2025.102573

Nikolay P. Nezlin , SeungHyun Son , Christopher W. Brown , Prasanjit Dash , Caren E. Binding , Ashley K. Elgin , Andrea VanderWoude

As a result of implementation of nutrient management following the binational Great Lakes Water Quality Agreement in 1972, the ecosystems within the Laurentian Great Lakes were gradually transforming to lower trophic regimes. This transformation dramatically accelerated in the late 1980s after the introduction of two invasive species of filter-feeding mussels of the genus Dreissena. We performed a detailed analysis of spatial and temporal patterns of this transformation using remotely sensed surface chlorophyll-a concentration (Chl-a) from the multi-satellite long-term Ocean Colour Climate Change Initiative (OC-CCI) dataset as a proxy of ecosystem state. We analyzed 25 years (1997–2022) of monthly composites covering most of the Great Lakes’ area detecting regime shifts in Chl-a employing an integrated approach combining Seasonal-Trend decomposition (STL) and Sequential T-test Analysis of Regime Shifts (STARS). The results identified the timings (shift points) when Chl-a stabilized at new lower trophic regimes, the magnitudes of Chl-a decrease across various lake regions and depths, and the changes in Chl-a seasonal cycles. In Lakes Michigan, Huron, and Ontario, the timings and magnitudes of regime shifts and vanishing of spring phytoplankton bloom suggest that dreissenid mussel presence was a primary driving factor of the observed transformation. We demonstrate that the OC-CCI dataset is a reliable source of information that enables the detection of these regime shifts in major lakes, with only minor effects of inconsistencies resulting from the biases between different satellites collecting data during different time periods.

1972年两国签订《五大湖水质协定》后，由于实施了营养物管理，劳伦森五大湖内的生态系统逐渐向低营养状态转变。在20世纪80年代末引入两种滤食性贻贝属入侵物种后，这种转变急剧加速。我们利用多卫星长期海洋颜色气候变化倡议（OC-CCI）数据集遥感地表叶绿素-a浓度（Chl-a）作为生态系统状态的代表，对这种转变的时空格局进行了详细分析。采用季节趋势分解（STL）和序贯t检验分析（STARS）相结合的综合方法，对覆盖大湖区大部分地区的25年（1997-2022）月度复合资料进行分析。结果确定了Chl-a在新的低营养状态下稳定的时间点、不同湖泊区域和深度的Chl-a下降幅度以及Chl-a的季节周期变化。在密歇根湖、休伦湖和安大略湖，制度转变的时间和规模以及春季浮游植物繁殖的消失表明，德莱森贻贝的存在是观察到的转变的主要驱动因素。我们证明OC-CCI数据集是一个可靠的信息来源，能够检测主要湖泊的这些状态变化，只有在不同时间段收集数据的不同卫星之间的偏差造成的不一致性的影响很小。

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引用次数: 0

A five-year summary of water quality, zooplankton, and fishes in the open waters of Lake Erie’s Presque Isle Bay 伊利湖普莱斯克岛湾开放水域水质、浮游动物和鱼类的五年总结

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

Journal of Great Lakes Research

Pub Date : 2025-04-03 DOI: 10.1016/j.jglr.2025.102574

Christopher M. Dempsey, Gregory M. Andraso, Michelle M. Kuns

Long-term monitoring of freshwater ecosystems is critical to understanding how these systems change over time. Our efforts have focused on the open waters of Lake Erie’s Presque Isle Bay (PIB) in Erie, Pennsylvania. The bay serves as an important economic and recreational body of water to the Erie region. Over the last several decades, the bay has undergone numerous water-quality changes and has been well studied, but no researchers have monitored PIB on a continuous basis. In the summer of 2017, a monthly monitoring program was started that focuses on detecting changes in water-quality as well as zooplankton and fish communities. Monitoring is focused from June through November each year. Sampling occurs each month in the same location aboard the RV Environaut. Here, data collected from 2017 through 2021 are presented to document changes in water quality, zooplankton, and fishes in the open waters of PIB. Analyses of variance (ANOVA) revealed a strong seasonal pattern and among-year variation in many water quality and fish parameters. Across the five-year period, linear regression revealed significant decreases in pH, Z_1% (the depth at which 1% of the light from the surface remains), and juvenile copepod abundance that we link to changes in water level. Our data contribute to the growing body of literature that highlights the importance of studying the near-shore embayments and coastal wetlands in Lake Erie. These shallow areas often respond to environmental perturbations faster or differently than the open waters of the lake.

长期监测淡水生态系统对于了解这些系统如何随时间变化至关重要。我们的工作主要集中在宾夕法尼亚州伊利市伊利湖的普莱斯克岛湾（PIB）的开放水域。该海湾是伊利地区重要的经济和娱乐水域。在过去的几十年里，该海湾经历了多次水质变化，并得到了很好的研究，但没有研究人员对PIB进行持续监测。2017年夏天，启动了一个月度监测计划，重点是检测水质以及浮游动物和鱼类群落的变化。监测的重点是每年的6月到11月。每个月在RV Environaut上的同一地点进行采样。在这里，收集了2017年至2021年的数据，以记录PIB开放水域的水质、浮游动物和鱼类的变化。方差分析（ANOVA）显示，许多水质和鱼类参数具有强烈的季节性和年内变化。在5年的时间里，线性回归显示pH值、Z1%（表面1%的光停留深度）和幼桡足动物丰度显著下降，我们将其与水位变化联系起来。我们的数据为越来越多的文献做出了贡献，这些文献强调了研究伊利湖近岸码头和沿海湿地的重要性。这些浅水区对环境扰动的反应往往比湖泊的开阔水域更快或不同。

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引用次数: 0