Journal of Great Lakes Research最新文献_第5页

Intraspecific variation in stable isotopes provides insight into adfluvial migrations and ecology of brook trout in Lake Superior tributaries

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

Journal of Great Lakes Research

Pub Date : 2025-02-01 DOI: 10.1016/j.jglr.2024.102487

Troy G. Zorn , Kevin Pangle , Nick Peterson , Henry Quinlan , Brandon Gerig

Identifying streams hosting salmonids with poorly understood adfluvial life histories, such as coaster brook trout, is challenging due to the lack of inexpensive, non-lethal techniques for confirming lake to stream movements for stream-captured fish. In this study, we used stable isotope data from 589 brook trout collected throughout the Lake Superior basin to characterize stream versus Lake Superior foraging. We observed strong isotopic separation in δ¹³C between brook trout inhabiting Lake Superior and lake-inaccessible stream reaches (i.e., those lacking Lake Superior access). Using these data, we developed a linear discriminant function (LDF) which assigned brook trout to Lake Superior or stream habitats with over 97 % accuracy. LDF and Bayesian stable isotope mixing models were then used to estimate stream and lake energy use by brook trout collected from lake-accessible reaches. Brook trout caught in lake-accessible reaches had isotope signatures and sizes that were intermediate to fish from lake-inaccessible reaches and Lake Superior, potentially indicative of Lake Superior to stream migrations or possibly an energy subsidy from adfluvial migrants in streams. The LDF was used to estimate the probability that recently grown fin tissue from brook trout collected in lake-accessible reaches resulted from foraging in Lake Superior. We identified tributaries hosting “likely” coaster brook trout using a fish’s length and LDF probability value. Our findings show the potential and limitations of this approach for confirming adfluvial migrations of brook trout.

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引用次数: 0

The aggregate economic value of Great Lakes recreational fishing trips

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

Journal of Great Lakes Research

Pub Date : 2025-01-30 DOI: 10.1016/j.jglr.2025.102529

John C. Whitehead , Louis Cornicelli , Lisa Bragg , Rob Southwick

We use the contingent valuation method in a survey of Great Lakes anglers to estimate the willingness to pay for a Great Lakes recreational fishing trip. We find that the willingness to pay for a trip ranges from $55 to $161 ($2020). We then combine the willingness to pay per trip estimates with an estimate of the number of trips and find that the aggregate value of Great Lakes recreational fishing trips in the U.S. is $884 million per year. We conduct a sensitivity analysis using a Monte Carlo simulation and estimate that the mean aggregate economic value is $901 million with a 90% confidence interval of [$407, $1,398] million. The estimate of aggregate recreational fishing value illustrates the economic importance of the Great Lakes recreational fishery over and above market expenditures.

引用次数: 0

Comparison of fish community metrics between natural and modified open coast shorelines in Lake Ontario

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

Journal of Great Lakes Research

Pub Date : 2025-01-25 DOI: 10.1016/j.jglr.2025.102513

Jonathan D. Midwood , Scott G. Blair , Christine M. Boston , Adam S. van der Lee , Morgan L. Piczak

Various shoreline hardening structures are used in open coast environments to reduce erosion caused by wind and wave action and protect infrastructure. As modifications to natural shorelines are increasingly applied, it is important to identify hardening techniques that have minimal negative effects on local fish communities. We compared five fish community metrics (catch, species richness, indices of biotic integrity (IBI) and productivity (HPI), and the presence of non-pelagic fishes) among seven open coast shoreline types sampled during the summer in Lake Ontario, Canada. Using an Integrated Nested Laplace Approximation approach to account for spatial autocorrelation, best fit generalized linear models were identified for each fish community metric based on shoreline types, environmental factors, and proximity features. Artificial groynes (armourstone barriers protruding into the lake) and mixed shorelines (multiple shoreline types) tended to have similar fish community metrics to natural shorelines (sand, mixed, and gravel beaches) and higher metric values than revetments (sloped armourstone shorelines). Catch declined with increasing water temperature at the time of sampling. Sampling sites in close proximity to areas that could provide shelter (e.g., harbours) had higher species richness, IBI scores, and were more likely to contain non-pelagic fishes. This suggests that while some artificial shoreline types have similar fish community metrics to more natural open coast areas and may thus be preferable, local environmental conditions and the proximity of features that can provide shelter from wind and wave action are critical considerations when planning and evaluating shoreline hardening in large waterbodies like the Laurentian Great Lakes.

{"title":"Comparison of fish community metrics between natural and modified open coast shorelines in Lake Ontario","authors":"Jonathan D. Midwood , Scott G. Blair , Christine M. Boston , Adam S. van der Lee , Morgan L. Piczak","doi":"10.1016/j.jglr.2025.102513","DOIUrl":"10.1016/j.jglr.2025.102513","url":null,"abstract":"<div><div>Various shoreline hardening structures are used in open coast environments to reduce erosion caused by wind and wave action and protect infrastructure. As modifications to natural shorelines are increasingly applied, it is important to identify hardening techniques that have minimal negative effects on local fish communities. We compared five fish community metrics (catch, species richness, indices of biotic integrity (IBI) and productivity (HPI), and the presence of non-pelagic fishes) among seven open coast shoreline types sampled during the summer in Lake Ontario, Canada. Using an Integrated Nested Laplace Approximation approach to account for spatial autocorrelation, best fit generalized linear models were identified for each fish community metric based on shoreline types, environmental factors, and proximity features. Artificial groynes (armourstone barriers protruding into the lake) and mixed shorelines (multiple shoreline types) tended to have similar fish community metrics to natural shorelines (sand, mixed, and gravel beaches) and higher metric values than revetments (sloped armourstone shorelines). Catch declined with increasing water temperature at the time of sampling. Sampling sites in close proximity to areas that could provide shelter (e.g., harbours) had higher species richness, IBI scores, and were more likely to contain non-pelagic fishes. This suggests that while some artificial shoreline types have similar fish community metrics to more natural open coast areas and may thus be preferable, local environmental conditions and the proximity of features that can provide shelter from wind and wave action are critical considerations when planning and evaluating shoreline hardening in large waterbodies like the Laurentian Great Lakes.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 2","pages":"Article 102513"},"PeriodicalIF":2.4,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631816","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

A watershed model predicts the effects of cover crops on river flows, sediment transport, and nutrient loss to Lake Michigan 流域模型预测覆盖作物对河流流量、沉积物迁移以及密歇根湖养分流失的影响

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

Journal of Great Lakes Research

Pub Date : 2025-01-23 DOI: 10.1016/j.jglr.2025.102528

Mohamed A. Aboelnour , Jennifer L. Tank , Alan F. Hamlet , Todd V. Royer , Diogo Bolster

Recent investigations highlight the imperative of diminishing nonpoint nutrient loading to mitigate the prevalence of harmful algal blooms and hypoxic conditions in the Great Lakes region. This study employs the Soil and Water Assessment Tool (SWAT) to conduct a comprehensive assessment of the model’s performance in simulating hydrology, sediment, and nutrient dynamics at the St. Joseph River Basin (SJRB). We used the SWAT model to evaluate the effectiveness of the planting of winter cover crops (WCC) on the magnitude and dynamics of dissolved nutrient and sediment export within the basin. We modeled different WCC scenarios by varying the fraction of the row-crop land to which WCC were planted during the fallow period. We show that although WCC have a minimal effect on streamflow, they substantially reduce total suspended solids (TSS) losses by up to 30 %, demonstrating their efficacy in soil erosion control. In contrast, there were variable effects of WCC on reducing dissolved reactive phosphorus (DRP) and nitrate-N (NO₃-N) losses, with a higher effect on NO₃-N losses than on DRP, resulting in up to a 4 % reduction in DRP and 12 % reduction in NO₃-N losses. This study underscores the versatility of the SWAT model in assessing watershed flow and nutrient and sediment dynamics, offering valuable insights into the quantification and intercomparison of conservation and management interventions that improve water quality in agricultural watersheds in the Great Lakes region.

{"title":"A watershed model predicts the effects of cover crops on river flows, sediment transport, and nutrient loss to Lake Michigan","authors":"Mohamed A. Aboelnour , Jennifer L. Tank , Alan F. Hamlet , Todd V. Royer , Diogo Bolster","doi":"10.1016/j.jglr.2025.102528","DOIUrl":"10.1016/j.jglr.2025.102528","url":null,"abstract":"<div><div>Recent investigations highlight the imperative of diminishing nonpoint nutrient loading to mitigate the prevalence of harmful algal blooms and hypoxic conditions in the Great Lakes region. This study employs the Soil and Water Assessment Tool (SWAT) to conduct a comprehensive assessment of the model’s performance in simulating hydrology, sediment, and nutrient dynamics at the St. Joseph River Basin (SJRB). We used the SWAT model to evaluate the effectiveness of the planting of winter cover crops (WCC) on the magnitude and dynamics of dissolved nutrient and sediment export within the basin. We modeled different WCC scenarios by varying the fraction of the row-crop land to which WCC were planted during the fallow period. We show that although WCC have a minimal effect on streamflow, they substantially reduce total suspended solids (TSS) losses by up to 30 %, demonstrating their efficacy in soil erosion control. In contrast, there were variable effects of WCC on reducing dissolved reactive phosphorus (DRP) and nitrate-N (NO<sub>3</sub>-N) losses, with a higher effect on NO<sub>3</sub>-N losses than on DRP, resulting in up to a 4 % reduction in DRP and 12 % reduction in NO<sub>3</sub>-N losses. This study underscores the versatility of the SWAT model in assessing watershed flow and nutrient and sediment dynamics, offering valuable insights into the quantification and intercomparison of conservation and management interventions that improve water quality in agricultural watersheds in the Great Lakes region.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 2","pages":"Article 102528"},"PeriodicalIF":2.4,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631820","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}

引用次数: 0

Phytoplankton trends in the Laurentian Great Lakes (2001–2021) reveal significant changes in phytoplankton abundance and taxonomic composition

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

Journal of Great Lakes Research

Pub Date : 2025-01-23 DOI: 10.1016/j.jglr.2025.102514

Euan D. Reavie , Katya E. Kovalenko , Meijun Cai , Elizabeth E. Alexson , Holly A. Wellard Kelly , Anne E. Scofield

We present Laurentian Great Lakes phytoplankton trends from 2001 to 2021 in spring and summer. Trend analysis identified significant changes in phytoplankton abundance and taxonomic composition. This included the loss of phytoplankton biovolume, especially diatoms, in lakes Huron and Michigan following the quagga mussel invasion, an increase in cyanobacteria especially in the central basin of Lake Erie, and an increase in phytoplankton biovolume in Lake Superior. Within functional groups, we observed increases in the absolute and relative abundances of flagellated organisms, largely owing to increases in single-celled cryptophytes and dinoflagellates in the spring and colonial chrysophytes in the summer, and a rise in lightly silicified rhizosolenoid diatoms during summer. Random forest analysis identified potential drivers and mechanisms for phytoplankton changes alongside concurrently sampled invertebrate and water quality parameters. The quagga mussel invasion was an important driver of major phytoplankton shifts, but climate change-related stressors affecting stratification are also likely drivers of changes. We observed strong relationships between phytoplankton and microzooplankton, with rotifers and copepod nauplii showing positive relationships with many phytoplankton groups, though whether these are top-down or bottom-up associations is not clear. This study recognizes continuing reorganization of the Great Lakes phytoplankton community that is likely to have long-term impacts on food webs.

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引用次数: 0

Routine metabolism of larval and early juvenile lake whitefish (Coregonus clupeaformis) and cisco (C. artedi) at three temperatures

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

Journal of Great Lakes Research

Pub Date : 2025-01-22 DOI: 10.1016/j.jglr.2025.102509

Kelly A. Hoyer , Peter D. Dijkstra , Tracy L. Galarowicz , Julia R. Harig , Jory L. Jonas , J. Ellen Marsden , Jason B. Smith , A. Scott McNaught

Lake whitefish (Coregonus clupeaformis) and cisco (C. artedi) are important contributors to Great Lakes ecosystems and to commercial and sport fisheries. Therefore, there is interest in understanding mechanisms that influence survival and growth, particularly recruitment declines beginning at early life stages. Routine metabolism is an important parameter in bioenergetic models to predict larval fish growth, yet there are few estimates of routine metabolic rate (RMR) for early life stage coregonines. We measured RMR of larval (<19 mm total length, TL) and early juvenile (19–29 mm TL) lake whitefish and cisco at three temperatures (8, 10, and 12 °C) to establish whether there are general differences between the two species or more specific differences in response to different temperatures. The metabolic rates of larval cisco were significantly higher than larval lake whitefish at 8 and 10 °C, but no species-specific differences in metabolic rates were observed at the early juvenile stage. RMR was positively related to temperature for both species at both life stages, although the magnitude of the temperature-dependent response was less pronounced for early juvenile fish than it was for smaller fish. With higher metabolic rates earlier in life compared to lake whitefish, larval cisco may exhibit higher growth rates if food resources are plentiful and may experience faster swimming speeds to search for prey and escape predators when resources are limited relative to lake whitefish.

{"title":"Routine metabolism of larval and early juvenile lake whitefish (Coregonus clupeaformis) and cisco (C. artedi) at three temperatures","authors":"Kelly A. Hoyer , Peter D. Dijkstra , Tracy L. Galarowicz , Julia R. Harig , Jory L. Jonas , J. Ellen Marsden , Jason B. Smith , A. Scott McNaught","doi":"10.1016/j.jglr.2025.102509","DOIUrl":"10.1016/j.jglr.2025.102509","url":null,"abstract":"<div><div>Lake whitefish (<em>Coregonus clupeaformis</em>) and cisco (<em>C. artedi</em>) are important contributors to Great Lakes ecosystems and to commercial and sport fisheries. Therefore, there is interest in understanding mechanisms that influence survival and growth, particularly recruitment declines beginning at early life stages. Routine metabolism is an important parameter in bioenergetic models to predict larval fish growth, yet there are few estimates of routine metabolic rate (RMR) for early life stage coregonines. We measured RMR of larval (<19 mm total length, TL) and early juvenile (19–29 mm TL) lake whitefish and cisco at three temperatures (8, 10, and 12 °C) to establish whether there are general differences between the two species or more specific differences in response to different temperatures. The metabolic rates of larval cisco were significantly higher than larval lake whitefish at 8 and 10 °C, but no species-specific differences in metabolic rates were observed at the early juvenile stage. RMR was positively related to temperature for both species at both life stages, although the magnitude of the temperature-dependent response was less pronounced for early juvenile fish than it was for smaller fish. With higher metabolic rates earlier in life compared to lake whitefish, larval cisco may exhibit higher growth rates if food resources are plentiful and may experience faster swimming speeds to search for prey and escape predators when resources are limited relative to lake whitefish.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 2","pages":"Article 102509"},"PeriodicalIF":2.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631837","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

Age-dependent juvenile mortality explains delayed smolting in a declining steelhead population 受年龄影响的幼鱼死亡率解释了钢镞种群数量下降的延迟蜕皮原因

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

Journal of Great Lakes Research

Pub Date : 2025-01-16 DOI: 10.1016/j.jglr.2025.102508

Kyle Stratton , Jon George , Friedrich Fischer , Thomas R. Hrabik , Erin S. Dunlop , Brian J. Shuter , Michael D. Rennie

Fish populations in the Laurentian Great Lakes have undergone major changes over recent decades. Demographic changes in fish populations are often accompanied by changes in life history strategies that reflect variation in mortality applied to different life stages. We examined the steelhead (Oncorhynchus mykiss) population in Black Bay, Lake Superior, where a naturalized steelhead population experienced significant demographic changes over three decades. Initial increases in density in Portage Creek, Black Bay (1995–2007) were associated with reductions in angler mortality (applied to adult steelhead), but the population declined (2007–2018) despite no further changes in angler mortality. Simultaneously, the dominant life history among several Black Bay tributaries changed between 2013 and 2017, with returning spawners becoming primarily represented by individuals who smolted at age 2 (a more common pattern across other Lake Superior populations) from those who primarily smolted at age 1. To assess whether changes in juvenile mortality could explain observed life history shifts in surviving spawners and recent steelhead population declines, we constructed Leslie matrices with differential mortality applied to observed demographics from Portage Creek steelhead to evaluate scenarios representing increased parr (in-stream) mortality and increased smolt (in-lake) mortality. The observed demographic changes in Portage Creek (i.e., shift from 1 to 2 year smolts and associated population declines) were predicted by a model applying size-dependent smolt survivorship to female steelhead in a fashion consistent with increased in-lake mortality of age 1 smolts. This study provides an example of population-level responses to increased stage-specific mortality and offers an example of how in-lake conditions can influence potamodromous salmonids in the Laurentian Great Lakes.

{"title":"Age-dependent juvenile mortality explains delayed smolting in a declining steelhead population","authors":"Kyle Stratton , Jon George , Friedrich Fischer , Thomas R. Hrabik , Erin S. Dunlop , Brian J. Shuter , Michael D. Rennie","doi":"10.1016/j.jglr.2025.102508","DOIUrl":"10.1016/j.jglr.2025.102508","url":null,"abstract":"<div><div>Fish populations in the Laurentian Great Lakes have undergone major changes over recent decades. Demographic changes in fish populations are often accompanied by changes in life history strategies that reflect variation in mortality applied to different life stages. We examined the steelhead (<em>Oncorhynchus mykiss</em>) population in Black Bay, Lake Superior, where a naturalized steelhead population experienced significant demographic changes over three decades. Initial increases in density in Portage Creek, Black Bay (1995–2007) were associated with reductions in angler mortality (applied to adult steelhead), but the population declined (2007–2018) despite no further changes in angler mortality. Simultaneously, the dominant life history among several Black Bay tributaries changed between 2013 and 2017, with returning spawners becoming primarily represented by individuals who smolted at age 2 (a more common pattern across other Lake Superior populations) from those who primarily smolted at age 1. To assess whether changes in juvenile mortality could explain observed life history shifts in surviving spawners and recent steelhead population declines, we constructed Leslie matrices with differential mortality applied to observed demographics from Portage Creek steelhead to evaluate scenarios representing increased parr (in-stream) mortality and increased smolt (in-lake) mortality. The observed demographic changes in Portage Creek (i.e., shift from 1 to 2 year smolts and associated population declines) were predicted by a model applying size-dependent smolt survivorship to female steelhead in a fashion consistent with increased in-lake mortality of age 1 smolts. This study provides an example of population-level responses to increased stage-specific mortality and offers an example of how in-lake conditions can influence potamodromous salmonids in the Laurentian Great Lakes.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 2","pages":"Article 102508"},"PeriodicalIF":2.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631815","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}

引用次数: 0

Spatial genetic structure of upper Great Lakes burbot (Lota lota)

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

Journal of Great Lakes Research

Pub Date : 2025-01-14 DOI: 10.1016/j.jglr.2024.102506

Grant L. Bruninga , Jeannette Kanefsky , Kim T. Scribner

The population abundance and distribution of many Great Lakes fish species, particularly those that are adapted to cold water, have changed greatly in recent times due in part to changes in physical lake and biotic environments. Burbot (Lota lota) is an understudied cold water benthivore of conservation concern. To characterize levels of genetic diversity and spatial genetic structure associated with historical phylogeographic isolation or contemporary reproductive isolation, microsatellite genotypes and mitochondrial DNA sequences were analyzed for burbot (n = 253) collected from 14 open water locations in Lakes Huron, Michigan, and Superior and the upper St. Clair River. Spatial variation in levels of diversity and degree of genetic distinction among samples in different geographic locations was most evident over broader geographic scales between Lake Superior and Lakes Michigan and Huron. Members of open-water sampling locations within basins did not differ significantly in microsatellite allele or mtDNA haplotype frequency. Data from this study and from previous results in other North American locations indicated that burbot sampled from the upper Great Lakes likely originated from multiple glacial refugia, and that geographic representations were admixed at the lake basin level. Analyses differentiating populations of burbot will inform managers how to appropriately target the genetically differentiated populations to support species management.

近代以来，由于湖泊物理环境和生物环境的变化，许多五大湖鱼类，特别是那些适应冷水的鱼类，其种群数量和分布发生了很大变化。伯宝鱼（Lota lota）是一种未得到充分研究的冷水底栖动物，其保护问题备受关注。为了描述与历史上的系统地理隔离或当代的生殖隔离相关的遗传多样性水平和空间遗传结构，我们分析了从休伦湖、密歇根湖、苏必利尔湖和圣克莱尔河上游的 14 个开放水域采集的水豚（n = 253）的微卫星基因型和线粒体 DNA 序列。在苏必利尔湖与密歇根湖和休伦湖之间较宽的地理范围内，不同地理位置样本之间的多样性水平和遗传差异程度的空间差异最为明显。流域内开阔水域采样点的成员在微卫星等位基因或 mtDNA 单倍型频率方面没有显著差异。这项研究的数据以及之前在北美其他地区的研究结果表明，从五大湖上游采样的大菱鲆可能来自多个冰川避难所，在湖泊流域层面的地理代表性是混合的。通过分析大菱鲆种群的差异，管理者将了解如何适当地针对基因差异种群进行物种管理。

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引用次数: 0

Suspect screening and nontargeted analysis of polyfluoroalkyl substances in Lake Huron water and biota

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

Journal of Great Lakes Research

Pub Date : 2025-01-12 DOI: 10.1016/j.jglr.2025.102507

Junda Ren , Sujan Fernando , Philip K. Hopke , Thomas M. Holsen , Bernard S. Crimmins

Nontargeted analyses (NTA) have identified numerous unknown/novel per- and polyfluoroalkyl substances (PFAS) in water, aqueous film-forming foam, and commercial products, but few studies have used nontargeted approaches to analyze PFAS in aquatic organisms. This study employed NTA to investigate PFAS profiles in the Lake Huron water and biota, including zooplankton, dreissenid mussels, selected prey fish, and lake trout (Salvelinus namaycush). Five suspect perfluoroalkyl acids (PFAA) precursors and perfluoroethylcyclohexane sulfonate (PFECHS) were detected in the water and biota without the use of reference standards. Notably, N-ethyl perfluorooctane sulfonamido acetate (EtFOSAA) was detected in deepwater sculpin (Myoxocephalus thompsonii), PFECHS was detected in water and deepwater sculpin, and N-methyl perfluorooctanesulfonamido acetate (MeFOSAA) was detected in bloater (Coregonus hoyi). Different species are likely exposed to different PFAS due to variations in habitat and food sources. However, PFAS may also bioaccumulate in both prey and predator through foraging. To verify this hypothesis, unknown PFAS features observed in two or more composites from each species were isolated. The unknown PFAS with estimated concentrations >0.5 ng/g wet weight, and biomagnification factors (BMF) >1 were then isolated from all PFAS candidates detected in the food web components, particularly those identified in both prey and predator species. This subset of PFAS features was then slated for structural elucidation. A total of 66 unknown PFAS were detected in the biota and 19 in the water, with proposed structures containing carboxylic, ether, thiol, sulfonyl, amino, and amide groups.

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引用次数: 0

Anthropogenic litter and plastics across size classes on a mechanically groomed Great Lakes urban beach

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

Journal of Great Lakes Research

Pub Date : 2025-01-09 DOI: 10.1016/j.jglr.2024.102505

Anne J. Jefferson , Kayla Kearns , Kylie Snyder , Alexis Mitchell , Sophia Muratori , Christopher J. Rowan

Anthropogenic litter and plastic pollution are well-recognized global and Great Lakes stressors, but the distribution of plastic pollution on shorelines is uneven. Beaches in urban areas are close to many potential sources of plastic pollution and often heavily visited, so are likely exposed to high litter inputs. Conversely, beach maintenance activities, including mechanical grooming, may lower litter concentrations. In the summer of 2021, surface litter and > 2 mm anthropogenic materials within the top 5 cm of beach sediment were repeatedly measured along 10 transects at Euclid Beach, in Cleveland, Ohio. Plastics comprised 79 % of litter > 50 mm and 100 % of smaller visible litter on the beach surface. Surface litter concentrations (0.279 pieces m⁻²) were relatively low compared to previously studied Great Lakes strandlines, with mechanical grooming and beach visitor usage influencing litter distribution. However, when plastics within the top 5 cm of the beach sediment were included, Euclid Beach microplastics (54.7 pieces m⁻²) and mesoplastics (45.0 pieces m⁻²) concentrations were among the highest in the Great Lakes. Plastic production pellets were the most common microplastic morphology, while foamed plastics were the most common mesoplastics. Most plastics in the sediment were too small to be removed by mechanical grooming, but fragmentation of larger, weathered plastics is a potential concern deserving further investigation. Overall, our results suggest that urban, mechanically-groomed beaches can have high plastics loads. Such beaches should be strategically included in larger scale studies of plastic pollution along shorelines, especially when considering issues of environmental justice.

{"title":"Anthropogenic litter and plastics across size classes on a mechanically groomed Great Lakes urban beach","authors":"Anne J. Jefferson , Kayla Kearns , Kylie Snyder , Alexis Mitchell , Sophia Muratori , Christopher J. Rowan","doi":"10.1016/j.jglr.2024.102505","DOIUrl":"10.1016/j.jglr.2024.102505","url":null,"abstract":"<div><div>Anthropogenic litter and plastic pollution are well-recognized global and Great Lakes stressors, but the distribution of plastic pollution on shorelines is uneven. Beaches in urban areas are close to many potential sources of plastic pollution and often heavily visited, so are likely exposed to high litter inputs. Conversely, beach maintenance activities, including mechanical grooming, may lower litter concentrations. In the summer of 2021, surface litter and > 2 mm anthropogenic materials within the top 5 cm of beach sediment were repeatedly measured along 10 transects at Euclid Beach, in Cleveland, Ohio. Plastics comprised 79 % of litter > 50 mm and 100 % of smaller visible litter on the beach surface. Surface litter concentrations (0.279 pieces m<sup>−2</sup>) were relatively low compared to previously studied Great Lakes strandlines, with mechanical grooming and beach visitor usage influencing litter distribution. However, when plastics within the top 5 cm of the beach sediment were included, Euclid Beach microplastics (54.7 pieces m<sup>−2</sup>) and mesoplastics (45.0 pieces m<sup>−2</sup>) concentrations were among the highest in the Great Lakes. Plastic production pellets were the most common microplastic morphology, while foamed plastics were the most common mesoplastics. Most plastics in the sediment were too small to be removed by mechanical grooming, but fragmentation of larger, weathered plastics is a potential concern deserving further investigation. Overall, our results suggest that urban, mechanically-groomed beaches can have high plastics loads. Such beaches should be strategically included in larger scale studies of plastic pollution along shorelines, especially when considering issues of environmental justice.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 2","pages":"Article 102505"},"PeriodicalIF":2.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631889","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}

引用次数: 0