Journal of Great Lakes Research最新文献_第4页

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

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-06-06 DOI: 10.1016/j.jglr.2025.102612

Michael R. Twiss

{"title":"Insight into successful research impacts: An environmental scan of academic and non-governmental institutes focused on the Laurentian Great Lakes ecosystem","authors":"Michael R. Twiss","doi":"10.1016/j.jglr.2025.102612","DOIUrl":"10.1016/j.jglr.2025.102612","url":null,"abstract":"<div><div>Protection of water quality and ecosystem health of the Great Lakes is strongly supported by people living in their watershed. Greater scientific understanding of the Great Lakes ecosystem is recognised as a key need for designing and conducting research that will provide the best means to protect the ecosystem and evaluate environmental restoration actions. Water research centres that focus on the Great Lakes aquatic ecosystem are important features of research infrastructure in the region and provide service to environmental governance, outreach, and education. An environmental scan was conducted on 22 academic and non-governmental water research centres to understand the types of institutional governance and scope of activity that leads to successful centres. All water centres are viewed favourably at their respective institutions and in their communities and serve important science communication roles with the public. Public outreach is an important function of water centres in the Great Lakes region, and greater efforts are required for fully inclusive and participatory involvement with stakeholders and rights holders. This study will be useful for any organisation seeking to develop a new or revise an existing water centre in the Great Lakes region to serve the growing need to protect water quality and ecosystem integrity.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102612"},"PeriodicalIF":2.4,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687526","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

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

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-06-06 DOI: 10.1016/j.jglr.2025.102606

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

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

引用次数: 0

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

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-06-04 DOI: 10.1016/j.jglr.2025.102607

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

{"title":"Seasonality interacts with mixed land use and conservation in controlling patterns of nutrient and pathogen export from agricultural watersheds","authors":"Anna E.S. Vincent , Jennifer L. Tank , Ursula H. Mahl , Kyle Bibby","doi":"10.1016/j.jglr.2025.102607","DOIUrl":"10.1016/j.jglr.2025.102607","url":null,"abstract":"<div><div>Fertilizer runoff is a significant source of nutrients to streams draining agricultural watersheds and results in numerous downstream impacts including eutrophication and coastal hypoxia. Additionally, pathogen export linked to manure application poses a threat to human health and results in recreational closures. Agricultural conservation practices, such as the planting of winter cover crops (CC), can reduce nutrient losses to streams, but their impacts on pathogen transport remain understudied. From 2019 to 2022, we sampled every 2 weeks in three subwatersheds of the Paw Paw River Basin (Michigan, USA) to assess the role of CC in reducing dissolved nitrate (NO<sub>3</sub><sup>–</sup>-N), ammonium (NH<sub>4</sub><sup>+</sup>-N), soluble reactive phosphorus (SRP), and the fecal bacterium <em>Escherichia coli</em> export. The three subwatersheds contain varying levels of agricultural land use, ranging from 41 to 77 %. Water column NO<sub>3</sub><sup>–</sup>-N (mg L<sup>-1</sup>) peaked during the winter and spring fallow season, while <em>E. coli</em> (CFU 100 mL<sup>−1</sup>) peaked during summer, which points to different drivers controlling NO<sub>3</sub><sup>–</sup>-N and pathogen export throughout the year. Increased daily yields of dissolved nutrient tended to coincide with more agricultural land cover; however, we measured highest daily yields of <em>E. coli</em> in the watershed with lowest agricultural land cover. Planting CC reduced NO<sub>3</sub><sup>–</sup>-N yield by 10–31 %, NH<sub>4</sub><sup>+</sup>-N yield by 19–22 %, SRP yields by 3–11 %, and <em>E. coli</em> yields by 17–48 %, and therefore is effective at mitigating both nutrient and pathogen export from agricultural landscapes, but additional work is required to fully understand the dynamics (timing and drivers) controlling <em>E. coli</em> export in watersheds of mixed land use.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102607"},"PeriodicalIF":2.4,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687612","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

Predation on fish larvae by black-striped pipefish (Syngnathus abaster) during the breeding season in invaded fresh waters of the Dnieper River basin 第聂伯河入侵淡水区繁殖季节黑条纹管鱼对鱼类幼鱼的捕食

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-06-04 DOI: 10.1016/j.jglr.2025.102613

Alexander Didenko , Igor Buzevych , Alexander Gurbyk , Vitaliy Bekh

{"title":"Predation on fish larvae by black-striped pipefish (Syngnathus abaster) during the breeding season in invaded fresh waters of the Dnieper River basin","authors":"Alexander Didenko , Igor Buzevych , Alexander Gurbyk , Vitaliy Bekh","doi":"10.1016/j.jglr.2025.102613","DOIUrl":"10.1016/j.jglr.2025.102613","url":null,"abstract":"<div><div>The black-striped pipefish <em>Syngnathus abaster</em>, which naturally inhabits brackish waters, invaded a variety of fresh waters of the Black Sea basin. Although this species penetrated fresh waters a long time ago and is known to prey on fish larvae, its habits and effects in these habitats were not studied sufficiently. The aim of this study was to investigate <em>S. abaster</em> predation on other fishes in invaded fresh waters in detail. The material for the study was collected between 2015 and 2020 in the Stugna River and Kaniv Reservoir (Dnieper River basin) during the breeding period of the majority of local fishes. The gut content analysis showed the presence of 44 prey taxa in the diet of <em>S. abaster</em>. The most important and frequently encountered prey were copepods. Fish larvae contributed 6.5–55.2 % of the total food items, while their relative importance in the diet ranged from 0.03 %IRI (percent index of relative importance) up to 14.36 % IRI. Four groups of fish prey were identified: Gobiidae, Cyprinidae, <em>Perccottus glenii</em>, and <em>S. abaster</em> juveniles. Fish were more frequently encountered and more abundant in the digestive tract of females than in males of <em>S. abaster</em>. Overall, the level of predation of this species on fish larvae was low and temporally associated with the massive spawning of co-occurring fishes inhabiting macrophytes. Previous studies suggest high to moderate probability of establishment of this species in the Laurentian Great Lakes if introduced, but the present study suggests relatively little effect on native fishes.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102613"},"PeriodicalIF":2.4,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687525","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 temporal comparison of nearshore fish communities in Hamilton Harbour and the Bay of Quinte areas of concern (1988–2021) 1988-2021年汉密尔顿港和昆特湾近岸鱼类群落的时间比较

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-05-31 DOI: 10.1016/j.jglr.2025.102609

Nicole A. Turner, Melanie V. Croft-White, Christine M. Boston, Jonathan D. Midwood

{"title":"A temporal comparison of nearshore fish communities in Hamilton Harbour and the Bay of Quinte areas of concern (1988–2021)","authors":"Nicole A. Turner, Melanie V. Croft-White, Christine M. Boston, Jonathan D. Midwood","doi":"10.1016/j.jglr.2025.102609","DOIUrl":"10.1016/j.jglr.2025.102609","url":null,"abstract":"<div><div>Lake Ontario and, in particular, areas across the western basin have been subjected to intense anthropogenic stressors. In response, Areas of Concern (AOC) were designated to aid in rehabilitation efforts to reduce nutrient loading and improve aquatic habitat. Here we use fish community metrics (e.g., Index of Biotic Integrity (IBI)) as well as species occurrence and catch modelling to compare trends in fish population condition over 30 years between Hamilton Harbour (HH) and the Bay of Quinte (BoQ). We found clear spatial differences within HH and limited evidence for improvement in nearshore fish populations. The few exceptions were declines in non-native species catch and richness and total offshore species catch, driven primarily by declines in common carp (<em>Cyprinus carpio</em>) and alewife (<em>Alosa pseudoharengus</em>). Similar declines in non-native species richness were evident in the BoQ, but IBI and fish population metrics, including proportion of piscivore biomass and native species catch and richness, were always greater in BoQ. In contrast, several metrics and species in HH showed recent declines (following 2012) that rolled back improvements observed in the early 2000 s. Such HH-specific changes suggest that local (e.g., ongoing anthropogenic disturbance, novel invasive species, and minimal changes in habitat supply) rather than regional factors are limiting recovery of the fish community.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102609"},"PeriodicalIF":2.4,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687605","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

Recovery of urban Great Lakes beaches after lake-level rise: The roles of infrastructure, sand supply, and management activities 湖面上升后五大湖城市海滩的恢复：基础设施、沙源和管理活动的作用

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-05-22 DOI: 10.1016/j.jglr.2025.102603

C.R. Mattheus

{"title":"Recovery of urban Great Lakes beaches after lake-level rise: The roles of infrastructure, sand supply, and management activities","authors":"C.R. Mattheus","doi":"10.1016/j.jglr.2025.102603","DOIUrl":"10.1016/j.jglr.2025.102603","url":null,"abstract":"<div><div>Managing beaches along urban waterfront corridors of the North American Great Lakes is challenging, as already complex lacustrine hydro-, littoral sand-supply, and coastal morphodynamics are impacted by shoreline and offshore infrastructure in ways not yet fully understood. This paper addresses the legacy controls of geomorphic developments and changes in sand volume within lakefront embayments, during high decadal base water-level conditions, on subsequent beach-recovery dynamics, during lake-level fall. Showcased are insights from annual topobathymetric assessments from 2021 through 2024, over which time Lake Michigan’s base water level fell by ∼ 1 m from its 2020 highstand. Data from ongoing geological monitoring activities were supplemented with federal datasets, which provided information on 2012–2020 sand volumetric changes across urban lakefront embayments with ∼ 1.5 m of lake-level rise. Beach geomorphic developments with 2020–2024 interannual lake-level fall are shown to have been influenced by the legacy of preceding morphodynamic and sand-sequestration patterns. Unlike the shared lake-level and storm histories, these parameters are beach-specific. While all Chicago beach shorelines retreated and experienced overwash into backshore regions during lake-level rise, shoreline advance and foredune re-establishment with lake-level fall have been influenced by preceding sand volumetric changes. This has implications for coastal managers, who must develop site-specific mitigation plans that take intrinsic controls of lakefront structures and time-varying sand-transport patterns on beach morphodynamics into account. The re-establishment of ecologically important foredune areas within urban beaches is of particular interest, given that the urban lakefront of Chicago has recently hosted nesting pairs of the endangered Great Lakes piping plover.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102603"},"PeriodicalIF":2.4,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687557","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

Silent invaders of freshwater ecosystems: Unveiling the microplastic crisis threatening the world’s largest soda lake (Lake Van, Türkiye) 淡水生态系统的无声入侵者：揭示威胁世界上最大的苏打湖（lake Van, trkiye）的微塑料危机

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-05-21 DOI: 10.1016/j.jglr.2025.102604

Münevver Oral Kaba , Mert Minaz , Cüneyt Kaya , Thibaut Jouy , Irmak Kurtul , Ülgen Aytan

{"title":"Silent invaders of freshwater ecosystems: Unveiling the microplastic crisis threatening the world’s largest soda lake (Lake Van, Türkiye)","authors":"Münevver Oral Kaba , Mert Minaz , Cüneyt Kaya , Thibaut Jouy , Irmak Kurtul , Ülgen Aytan","doi":"10.1016/j.jglr.2025.102604","DOIUrl":"10.1016/j.jglr.2025.102604","url":null,"abstract":"<div><div>This study aims to assess the status of microplastic (MP) pollution in Lake Van (Türkiye), a vital freshwater ecosystem with a unique ecological significance. The objectives were to determine MP abundance, size distribution, type and polymer composition, and potential ecological risks to fish species. Comprehensive sampling was conducted at eight stations for water, while three of these stations specifically focused on the gastrointestinal tracts of fish. The findings indicate a high prevalence of MPs, particularly in areas with significant human activity, such as station 1 at Sapur (mean ± SD 69.08 ± 22.3 MP/m<sup>3</sup>) and station 6 at Gevaş (72.41 ± 26.9 MP/m<sup>3</sup>). Fibers were dominant in both water and fish samples, with polyethylene terephthalate (PET) and polyacrylonitrile (PAN) being the most commonly identified polymers. This study highlights the occurrence of MPs in endemic and/or economically important fish species such as tarek (<em>Alburnus tarichi</em>) (mean 1.50–2.25 MP/indiv.), Van loach (<em>Oxynoemacheilus ercisianus</em>) (mean 0.55 MP/indiv.), lizard barbel (<em>Barbus lacerta</em>) (mean 0.57 MP/indiv.), and Levantine scraper (<em>Capoeta damascina</em>) (mean 1.00–1.75 MP/indiv.). These findings highlight the potential ecological risks posed by MP contamination for ecosystem, fish, and human health, and the urgent need for targeted mitigation strategies to reduce MP pollution. The study provides critical baseline data for understanding MP dynamics in Lake Van and contributes to the broader understanding of freshwater MP contamination on a global scale.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102604"},"PeriodicalIF":2.4,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686215","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

FM2-3: Editorial Board / Information for Authors FM2-3：编辑委员会/作者信息

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-05-14 DOI: 10.1016/S0380-1330(25)00085-1

引用次数: 0

Microcystin persistence in Lake Erie foreshore sands 伊利湖滨沙中微囊藻毒素的持久性

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-05-14 DOI: 10.1016/j.jglr.2025.102601

Garrett B. Moots, Daryl L. Moorhead, Chelsey E. Suffety, Kayla M. Kinzel, Daryl F. Dwyer, Von Sigler

{"title":"Microcystin persistence in Lake Erie foreshore sands","authors":"Garrett B. Moots, Daryl L. Moorhead, Chelsey E. Suffety, Kayla M. Kinzel, Daryl F. Dwyer, Von Sigler","doi":"10.1016/j.jglr.2025.102601","DOIUrl":"10.1016/j.jglr.2025.102601","url":null,"abstract":"<div><div>Research into the persistence of microcystin (MC) in foreshore sands is limited. Lake water and foreshore sand samples were collected weekly from three swim coves at Maumee Bay Park Beach (OH) during the recreational swim season to assess the accumulation and persistence of MC in foreshore sands. Enzyme-linked-immunosorbent-assay (ELISA) analysis showed that 14 % of lake water samples exceeded the EPA no-contact threshold for MC in recreational waters (8 µg/L), with a maximum concentration of 17 µg/L occurring during a bloom event. Average MC concentrations in surface foreshore sands (4 µg/L porewater) were significantly higher, on average, than in deeper sands (2 µg/L porewater), while peak sand MC concentrations exceeded 29 µg/L during two bloom events. Overall, MC concentrations in both shallow and deep sand exceeded water MC concentrations in 56 % of samples, indicating accumulation of MC in foreshore sands. MC persistence was determined in laboratory microcosms containing either autoclaved or non-autoclaved sands augmented with MC. ELISA analysis showed a 46 % reduction in MC concentration in autoclaved sands over 7 weeks. In non-autoclaved sands, the MC concentration decreased by 100 % during the study, with approximately 99 % of the added MC degrading during days 21–28, suggesting that a biological mechanism drove degradation. Our findings reveal that beach sands can act as MC reservoirs, accumulating and concentrating MC during and following bloom events.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102601"},"PeriodicalIF":2.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687522","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

Lean lake trout are found in spawning condition during spring-summer in lakes Michigan and Huron 在密西根湖和休伦湖的春夏季，瘦湖鳟鱼处于产卵状态

IF 2.4 3区环境科学与生态学

Journal of Great Lakes Research Pub Date : 2025-05-13 DOI: 10.1016/j.jglr.2025.102583

Shannon R. Cressman , Sarah A. Mansfield , Fredrick W. Goetz , Heather A. Hackney , Jared J. Homola , Francesco Guzzo , Charles R. Bronte

{"title":"Lean lake trout are found in spawning condition during spring-summer in lakes Michigan and Huron","authors":"Shannon R. Cressman , Sarah A. Mansfield , Fredrick W. Goetz , Heather A. Hackney , Jared J. Homola , Francesco Guzzo , Charles R. Bronte","doi":"10.1016/j.jglr.2025.102583","DOIUrl":"10.1016/j.jglr.2025.102583","url":null,"abstract":"<div><div>Here we report the first observations of the capture of lean lake trout (<em>Salvelinus namaycush</em>) in spawning condition in lakes Michigan and Huron during April–July, which is well outside their normal fall spawning season of September–December. Examination of 5731 lake trout landed by anglers at 56 ports in 2022 and 2023 revealed nine female lake trout possessing body cavities filled with mature, loose eggs and two males in ripe condition. Six fish were hatchery-reared and five were of wild origin. Ages of these fish ranged from 6 to 19 years and, of those where strain could be determined, were members of the Seneca Lake and Lewis Lake genetic strains. Loose eggs were similar in appearance to those found in mature fish in fall on spawning grounds. Histological examination of eggs from four females confirmed all were in some stage of ovarian maturity. Two females had ovulated just prior to capture, and the remaining two ovulated much earlier than the capture date. The adaptive advantage of the alternative seasonal spawning is speculative but may include reduced competition with fall spawners, decreased predation risk for juveniles during winter, and access to greater environmental resources in the early spring and summer.</div></div>","PeriodicalId":54818,"journal":{"name":"Journal of Great Lakes Research","volume":"51 4","pages":"Article 102583"},"PeriodicalIF":2.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687604","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