Journal of Great Lakes Research最新文献

{"title":"Long-term trends in particulate nutrients in offshore waters of the Laurentian Great Lakes","authors":"Erica P. Yang ,&nbsp;Anne M. Scofield ,&nbsp;Matthew B. Pawlowski","doi":"10.1016/j.jglr.2025.102539","DOIUrl":"10.1016/j.jglr.2025.102539","url":null,"abstract":"<div><div>The Laurentian Great Lakes have undergone significant ecological changes in recent decades. We characterized patterns and long-term trends in particulate nutrient concentrations and seston stoichiometry from 1997 to 2019 across all five Great Lakes using spring and summer particulate nutrient data routinely collected by the US EPA GLNPO Water Quality Monitoring Program. We observed broad differences between the upper and lower Great Lakes, likely driven by varying surrounding land use, nutrient dynamics, light and hydrological regimes, and internal processes. Lakes Huron and Michigan exhibited the most significant changes in particulate nutrient concentrations throughout the study period. Despite changes in particulate nutrient concentrations, no significant trends in seston stoichiometric ratios were observed in any of the lakes. We identified two periods of abrupt change (mid-2000s and 2012) in the particulate nutrient time series. The first period of change was characterized by significant declines in total suspended solids, particulate phosphorus, and particulate organic carbon concentrations, concurrent with the timing of documented lower food web changes in Lakes Huron and Michigan but preceding the period of rapid quagga mussel expansion into the Great Lakes. Since 2012, particulate nitrogen has abruptly increased in all lakes, resulting in increasingly imbalanced seston N:P and C:N. These shifts may have broader ecological implications, potentially affecting organisms higher up the food web through altered nutrient availability and balance. Tracking particulate nutrients will continue to be critical for lake management.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 2","pages":"Article 102539"},"PeriodicalIF":2.4,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631887","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}

{"title":"Genetic characterization and interspecies gene flow among the Oreochromis species in the Lake Victoria and Kyoga basins, Uganda: Implications for conservation","authors":"Gerald Kwikiriza ,&nbsp;Papius Dias Tibihika ,&nbsp;Ivan Abaho ,&nbsp;Juliet Kigongo Nattabi ,&nbsp;Thapasya Vijayan ,&nbsp;Christina Rupprecht ,&nbsp;Manuel Curto ,&nbsp;Andreas Melcher ,&nbsp;Harald Meimberg","doi":"10.1016/j.jglr.2025.102535","DOIUrl":"10.1016/j.jglr.2025.102535","url":null,"abstract":"<div><div>Despite the significant fishery contribution of the Victoria and Kyoga basins, the ecosystems have continuously been threatened by overfishing and introduction of alien species, among others. These activities have contributed to a significant decline of the native tilapiines, the Singida tilapia (<em>Oreochromis esculentus</em>) and Victoria tilapia (<em>Oreochromis variabilis</em>)<em>.</em> As a consequence, the native species have been relegated to smaller satellite lakes and replaced by non-native species comprising Nile tilapia (<em>O</em>. <em>niloticus</em>) and blue spotted tilapia (<em>O. leucostictus</em>)<em>.</em> Therefore, to better understand the implications of these events, it is important to assess the status of both native and non-native species in the Victoria and Kyoga basins for sustainable science-based informed management options. Utilizing both microsatellite and mitochondrial (mt) DNA markers, we sequenced a total of 739 individuals from the Victoria and Kyoga basins comprising <em>O. niloticus</em> (333), <em>O. esculentus</em> (151)<em>,</em> and <em>O. leucostictus</em> (258). Generally, all the species and their respective populations exhibited lower genetic diversity as well as genetic differentiation. The principal coordinate analysis showed three main distinct groups corresponding to the three species studied highlighting their genetic differentiation. However, some evidence of introgressive hybridization observed between <em>O. niloticus</em> and <em>O. esculentus</em> as well as <em>O. esculentus</em> and <em>O. leucostictus</em> suggests a need for a tailored management strategy to preserve the genetic integrity of all three <em>Oreochromis</em> species while minimizing the hybridization risks. The study recommends that the satellite waterbodies containing pure stocks of <em>O. esculentus</em> should be conserved separately with higher priority.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 2","pages":"Article 102535"},"PeriodicalIF":2.4,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The lampricide 3-trifluoromethyl-4-nitrophenol (TFM) stimulates oxygen consumption by larval sea lamprey in a dose-dependent manner","authors":"Leonard D’Souza ,&nbsp;Hugo Flávio ,&nbsp;Michael P. Wilkie","doi":"10.1016/j.jglr.2025.102536","DOIUrl":"10.1016/j.jglr.2025.102536","url":null,"abstract":"<div><div>Sea lamprey (<em>Petromyzon marinus</em>) are an invasive species in the Laurentian Great Lakes, where parasitism by blood-feeding juvenile lampreys greatly reduced populations of economically and culturally important native fishes in the early-mid 1900s. To control sea lamprey populations, the lampricide 3-trifluoromethyl-4-nitrophenol (TFM) is added to streams infested with larval sea lamprey. Sea lamprey have a lower capacity to detoxify TFM than most non-target fishes, making it a highly effective pesticide. TFM decreases ATP production by disrupting oxidative phosphorylation in the mitochondria, leading to an increase in mitochondrial oxygen consumption. However, little is known about how TFM affects whole animal oxygen consumption in sea lamprey and other fishes. To test the hypothesis that TFM has dose-dependent effects on larval sea lamprey metabolic rate, we measured the mass-specific oxygen consumption rates (<span><math><msub><mi>Ṁ</mi><msub><mi>O</mi><mn>2</mn></msub></msub></math></span>) of larval sea lamprey using intermittent-flow respirometry during TFM exposure. Exposure to increasing concentrations of TFM led to stepwise increases in <span><math><msub><mi>Ṁ</mi><msub><mi>O</mi><mn>2</mn></msub></msub></math></span> in larval sea lamprey, resulting in death after <span><math><msub><mi>Ṁ</mi><msub><mi>O</mi><mn>2</mn></msub></msub></math></span> reached levels equivalent to their known maximum metabolic rates. Similar measurements of <span><math><msub><mi>Ṁ</mi><msub><mi>O</mi><mn>2</mn></msub></msub></math></span> could be used to determine the relative TFM sensitivity of non-target species to better assess the potential impacts of TFM on resident fisheries.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 2","pages":"Article 102536"},"PeriodicalIF":2.4,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Turbidity associated with the beneficial placement of dredged sediment in the dynamic littoral zone at Fairport Harbor, Ohio","authors":"Douglas R. Krafft ,&nbsp;Jonathan M. Waddell ,&nbsp;Karen G. Keil ,&nbsp;Brett A. Hayhurst ,&nbsp;Brian C. McFall ,&nbsp;James P. Selegean","doi":"10.1016/j.jglr.2025.102533","DOIUrl":"10.1016/j.jglr.2025.102533","url":null,"abstract":"<div><div>The nearshore placement of sediments dredged via maintenance of navigation channels is a cost-effective management solution which offers myriad benefits that can include shoreline protection and habitat restoration. Benefits can be offset by concerns due to potential effects on the ecosystem from turbidity generated during placement. This study investigates the turbidity and geomorphic response of dredged sediment placed within the dynamic littoral zone of Lake Erie. Turbidity was measured at nine locations before, during, and after nearshore dredged material placement, and bathymetry was measured in four surveys to capture the effects of placing 39,400 m³ of material from Fairport Harbor, Ohio. Nearshore turbidity measurements collected before dredging occurred could be explained using wave data, which provided an estimate for expected background turbidity during and after dredging. These wave models continued to fit measured turbidity data well during and after dredged material placement and indicate sediment placement did not significantly increase turbidity at any of the monitoring locations. Bathymetry surveys indicate sediment was placed within the active littoral zone and may have contributed to accretion along the onshore edge of the pre-existing bar. These observations indicate that nearshore placement of dredged material in this environment is aligned with natural sediment movement in the littoral zone, with minimal to negligible generation of turbidity beyond what occurs naturally.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102533"},"PeriodicalIF":2.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687532","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}

{"title":"Development of a HAND-based flood risk assessment tool in Google Earth Engine for a data-scarce region in the US","authors":"Jobin Thomas ,&nbsp;Subhami Mohan ,&nbsp;Saumik Mallik ,&nbsp;Thomas Oommen ,&nbsp;Pengfei Xue ,&nbsp;Guy Meadows ,&nbsp;Navin Tony Thalakkottukara ,&nbsp;Ryan Williams","doi":"10.1016/j.jglr.2025.102510","DOIUrl":"10.1016/j.jglr.2025.102510","url":null,"abstract":"<div><div>Despite the decreased disaster resilience of rural communities in the Great Lakes region to flooding, flood mitigation efforts have been impeded by inadequate data and lack of appropriate tools for understanding flood risk. Development of such resources often requires data and computationally intensive approaches, which are challenging in data-scarce conditions. This study presents the development of a web application in Google Earth Engine (GEE) for flood risk assessment. The application utilizes the Height Above the Nearest Drainage (HAND) model and synthetic rating curve (SRC) for fluvial flood inundation modeling, the Simulating WAves Nearshore (SWAN) model for coastal flood inundation modeling, the United States Geological Survey (USGS) regional regression equations for estimating peak discharge, and depth-damage functions of the HAZUS-MH flood model for estimating losses due to building-level impacts. The GEE-based geospatial web application, which is operational across five counties in the Western Upper Peninsula (WUP) of Michigan, fulfills the requirement of the community and decision-makers to assess the risks caused by flooding in the region. We demonstrated the applicability of the tool in the Ontonagon River, Michigan, and the results indicate the suitability of the platform for implementing decisions, long-term planning, and understanding flood risk with a reasonable degree of accuracy.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102510"},"PeriodicalIF":2.4,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687558","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}

{"title":"Connecting tributary mercury loads to nearshore and offshore sediments in Lake Superior","authors":"Sarah E. Janssen ,&nbsp;Michael T. Tate ,&nbsp;Eric D. Dantoin ,&nbsp;Christopher T. Filstrup ,&nbsp;Euan D. Reavie ,&nbsp;Robert M. Stewart ,&nbsp;Chris Robinson ,&nbsp;Craig J. Allan ,&nbsp;Dale M. Robertson ,&nbsp;David P. Krabbenhoft","doi":"10.1016/j.jglr.2024.102381","DOIUrl":"10.1016/j.jglr.2024.102381","url":null,"abstract":"<div><div>Lake Superior has a vast and largely undeveloped watershed in comparison to the other Great Lakes, which makes it challenging to study mercury (Hg) sources and cycling. To examine Hg inputs to Lake Superior, we conducted an expansive binational assessment in 40 watersheds from a diverse range of landcover types. We further paired tributary Hg data to sediment source portfolios in the nearshore and offshore zones of Lake Superior through partnership with the Great Lakes Sediment Surveillance Program. We observed that total Hg loads were highest in the spring driven by the combination of elevated Hg concentrations and increased water discharge from snowmelt. In addition, total Hg concentrations in tributaries from remote, heavily forested regions, such as Pukaskwa National Park and the Minnesota Northshore, were higher than the Southshore and Thunder Bay regions. Methylmercury concentrations and loads were more spatially dependent, often corresponding to regions with more wetlands (e.g., Michigan Upper Peninsula). We estimated that the total Hg tributary load to Lake Superior in 2021 was 126 kg per year. To further examine the fate of watershed Hg sources, we examined sediments from 28 sites in Lake Superior using Hg stable isotopes. At open water sites, precipitation was the primary Hg source to sediments, but within nearshore sites Hg originated predominantly from watershed runoff. This work further defines the sources and fate of Hg within Lake Superior and highlights how Hg delivery is intrinsically tied to varying hydrologic regimes.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102381"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141692477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparison of phytoplankton development in Lake Baikal, Siberia, and Rybinsk Reservoir, Volga River, European Russia, using stability indices","authors":"Natalya Mineeva ,&nbsp;Nina Bondarenko","doi":"10.1016/j.jglr.2024.102493","DOIUrl":"10.1016/j.jglr.2024.102493","url":null,"abstract":"<div><div>Based on observations of 2009–2022, the state of phytoplankton and its main taxa was analyzed in Lake Baikal (Siberia, Russia) and Rybinsk Reservoir (European Russia), two large freshwater lake reservoirs. Data were collected during periods of phytoplankton seasonal maxima which determine the total level of their annual production. The development of phytoplankton was assessed by biomass expressed in units of wet weight for Lake Baikal and units of chlorophyll <em>a</em> for the Rybinsk Reservoir. To assess the sustainability of biomass, its coefficients of variation, deviation from the mean value, and population stability index were calculated. These metrics did not reveal any definite inter-annual trends in the state of phytoplankton, but showed sharp changes in the level of community resistance in years with different trophic state. In both water bodies, a decrease in stability was observed under conditions atypical for the ecosystem. In the oligotrophic Lake Baikal, the most unstable situation was noted in highly productive years with the mass development of diatoms in the spring plankton. In the moderately eutrophic Rybinsk Reservoir, its resistance decreased in low productivity years with a weak summer development of phytoplankton and cyanobacteria due to the unfavorable weather conditions. The proposed approach will be of interest for assessing the stability of other aquatic ecosystems.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102493"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129449","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}

{"title":"Role of tributary cyanobacterial and nutrient transport and sediment processes on cyanobacterial bloom initiation in Lake Superior nearshore","authors":"Rebecca M. Kreiling ,&nbsp;Carrie E. Givens ,&nbsp;Anna C. Baker ,&nbsp;Richard L. Kiesling ,&nbsp;Eric D. Dantoin ,&nbsp;Patrik M. Perner ,&nbsp;Shelby P. Sterner ,&nbsp;Kenna J. Gierke ,&nbsp;Paul C. Reneau","doi":"10.1016/j.jglr.2024.102409","DOIUrl":"10.1016/j.jglr.2024.102409","url":null,"abstract":"<div><div>Watershed fluxes of suspended sediment (SS), nutrients, in particular phosphorus (P), and cyanobacteria may play a role in driving cyanobacterial blooms along the southwestern shore of oligotrophic Lake Superior. To understand how tributary loads contribute to nearshore blooms, we sampled two southwestern shore tributaries, Bois Brule and Siskiwit Rivers. We collected water-quality samples to compute nutrient and sediment loads and to assess cyanobacteria community composition from the tributaries to the nearshore. We collected suspended and streambed sediment to assess the capacity for sediment to store and transport bioavailable P and to assess cyanobacteria community composition. Storm flows drove export of SS, total P, and total nitrogen, with the majority of total P being particulate P. Equilibrium P concentrations revealed that SS sorbed P as it is moved through the stream network across sites and seasons and was a potential source of P to the nearshore. However, streambed sediment in the Bois Brule and Siskiwit River watersheds were P sinks during summer, which potentially delayed transport of dissolved P to the lake. The cyanobacteria community varied spatially and temporally relating to multiple environmental variables including nutrients (P, N, and C) and specific conductivity. Cyanobacteria capable of producing cyanotoxins were present in tributaries and found across multiple environmental compartments indicating a potential for fluvial flow to the nearshore. This study demonstrated that streamflow is a primary driver of total nutrient and sediment loading in both watersheds, which indicates the potential for algal loading to the nearshore via suspended sediment or water.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102409"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthetic microfibers are ubiquitous in benthic algae from the Laurentian Great Lakes","authors":"Eddie Kostelnik ,&nbsp;Julie R. Peller ,&nbsp;Dror L. Angel ,&nbsp;Muruleedhara N. Byappanahalli ,&nbsp;Bharath Ganesh Babu ,&nbsp;Mary Anne Evans","doi":"10.1016/j.jglr.2025.102527","DOIUrl":"10.1016/j.jglr.2025.102527","url":null,"abstract":"<div><div>Synthetic microfibers are a class of microplastics routinely released into environmental media from domestic laundry and wastewater treatment plant effluent. Areas of high human population density discharge immense amounts of synthetic microfibers that pollute and accumulate in sediments, surface waters, algae, and other parts of the ecosystem. Synthetic microfibers are abundant in the Laurentian Great Lakes of North America, but their movement and fate are not well understood. Macroalgae effectively sequester microfibers; however, it is unknown if quantities of synthetic microfibers differ in benthic algae of the Great Lakes based on human population density or algal type (such as Cladophora or charophytes). Presented here is a 4-year study that investigated benthic algae samples from four of the Laurentian Great Lakes: Lakes Michigan, Huron, Ontario, and Erie. Synthetic microfibers were isolated and quantified in the algal samples, and values were analyzed with respect to algal type, lake, and population density. The average estimated number of synthetic microfibers per kg (dry weight) of benthic algae in each lake ranged from 1.6 <span><math><mrow><mo>×</mo></mrow></math></span> 10⁴ to 2.0 <span><math><mrow><mo>×</mo></mrow></math></span> 10⁴. Microscopic analysis suggested a possible interaction between epiphytic diatoms and benthic macroalgae (<em>Cladophora</em>), which may help to explain the ability of the algae to sequester microfibers regardless of algal type. The results also suggest a lack of correlation between human population density and number of synthetic microfibers in benthic algae, which could imply facile movement and distribution of microfibers in large bodies of water, that includes the aquatic food web of macroinvertebrates and fish communities.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 2","pages":"Article 102527"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631890","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}

{"title":"Food web structure of the Lake Superior fish community in 2021–2022","authors":"Ariel N. Edwards ,&nbsp;Shawn P. Sitar ,&nbsp;Ashley H. Moerke ,&nbsp;Jonathan P. Doubek ,&nbsp;Daniel L. Yule ,&nbsp;Dray D. Carl ,&nbsp;Cory A. Goldsworthy ,&nbsp;Ian C. Harding ,&nbsp;S. Ben Michaels ,&nbsp;Eric K. Berglund ,&nbsp;Seth A. Moore ,&nbsp;Brandon S. Gerig","doi":"10.1016/j.jglr.2024.102486","DOIUrl":"10.1016/j.jglr.2024.102486","url":null,"abstract":"<div><div>The trophic linkages and ecological requirements of the Lake Superior fish community have not been assessed on a whole lake scale in over a decade. Here, we investigated the trophic dynamics across multiple species and habitat zones of Lake Superior. From April to October of 2021 and 2022, a total of five piscivore, four planktivore, and six benthivore species were collected by region and length class during bottom-trawl, standard gillnet, commercial cisco gillnet, and recreational angler surveys. To assess trophic linkages, stomach contents were measured to estimate biomass consumed and a multivariate analysis was used to assess diet composition by species, length, and region. We found a high degree of interconnectedness in the Lake Superior food web, with <em>Mysis</em> as a critical diet item for most fishes. Native piscivore diets varied by region and with ontogeny. Lake charr were important habitat couplers in the lake, exhibiting a diverse diet and opportunistic foraging strategy. Conversely, Pacific salmon were more restricted in their foraging. Planktivores and benthivores primarily consumed <em>Mysis</em>, with less reliance on <em>Diporeia</em> compared to previous studies. Lake whitefish and cisco were the exception to this pattern, with broader bathymetric depth distributions represented in their diets. We found the food web to be supported by a predominantly native species assemblage, with redundancies at all trophic levels.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 1","pages":"Article 102486"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129595","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}